CN104674092A - Mg-Al-Zn heat-resistant magnesium alloy containing Sm and preparation method of alloy - Google Patents

Mg-Al-Zn heat-resistant magnesium alloy containing Sm and preparation method of alloy Download PDF

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CN104674092A
CN104674092A CN201510088986.7A CN201510088986A CN104674092A CN 104674092 A CN104674092 A CN 104674092A CN 201510088986 A CN201510088986 A CN 201510088986A CN 104674092 A CN104674092 A CN 104674092A
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CN104674092B (en
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陈君
张清
李全安
李梅菊
朱宏喜
周耀
严景龙
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Henan University of Science and Technology
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

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Abstract

The invention discloses an Mg-Al-Zn heat-resistant magnesium alloy containing Sm and a preparation method of the alloy. The Mg-Al-Zn heat-resistant magnesium alloy containing Sm comprises the following component by weight percent: 2-11% of Al, 1.5-3% of Zn, 1.8-4% of Sm, 0.2-1.8% of Ag, 0.1-1.9% of Ca, 0.1-0.7% of Sr, 0.1-0.9% of Sn, 0.1-0.5% of Ti and the balance of Mg. The method comprises the following steps: introducing proper amount of rare earth element Sm, alkaline earth elements Ca and Sr, and other elements Ag, Sn and Ti, modifying the alloy by a multicomponent microalloying method, and performing thermal treating on the obtained as-cast alloy. The prepared Mg-Al-Zn alloy has high indoor temperature and high temperature tensile strengths, the plasticity is greatly improved and the microscopic structure is uniform. The magnesium alloy provided by the invention is low in cost and simple in melting and thermal treatment process.

Description

A kind of Mg-Al-Zn system heat resistance magnesium alloy containing Sm and preparation method thereof
Technical field
The invention belongs to metallic substance and metallurgical technology field, specifically a kind of Mg-Al-Zn system heat resistance magnesium alloy containing Sm and preparation method thereof.
Background technology
Mg-based hydrogen storage is as structural metallic materials the lightest in engineer applied, there is low density, high specific tenacity and specific rigidity, excellent damping characteristics and good thermal diffusivity, apply very significant advantage in a lot of fields, particularly in Aeronautics and Astronautics and automobile, motorcycle, high speed light rail train, there is the advantage being difficult to substitute.Current commercial magnesium alloy can be divided into cast magnesium alloys and the large class of wrought magnesium alloys two substantially.In cast magnesium alloys, AZ system is owing to having cheap price and good casting technique and being most widely used, mainly contain AZ91 series and AM60/50 series, but the resistance toheat of two kinds of alloys is all poor, after envrionment temperature is more than 120 DEG C, the intensity of magnesium alloy can suddenly decline, and limits its application on many industrial equipmentss and product.In order to expand range of application and the field of magnesium alloy, scientific effort has carried out a large amount of exploratory development to existing magnesium alloy, the room temperature and the mechanical behavior under high temperature that utilize alloying raising magnesium alloy are important means, alloy element used mainly contains rare earth element and other elements such as alkaline earth element and aluminium, zinc, tin, in succession develop a series of heat resistance magnesium alloy, but all contain the noble element of higher proportion in the composition of these alloys, cause cost of alloy higher, therefore continue the magnesium alloy that research and development high thermal resistance is more excellent.
Summary of the invention
The object of this invention is to provide and a kind ofly there is higher room temperature and Testing Tensile Strength at Elevated Temperature, microstructure evenly and lower-cost Mg-Al-Zn system heat resistance magnesium alloy containing Sm and preparation method thereof.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 2 ~ 11%, Zn be 1.5 ~ 3%, Sm is 1.8 ~ 4%, Ag is 0.2 ~ 1.8%, Ca be 0.1 ~ 1.9%, Sr is 0.1 ~ 0.7%, Sn is 0.1 ~ 0.9%, Ti is 0.1 ~ 0.5%, and surplus is Mg;
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 4.79%, Zn be 2.97%, Sm be 2.84%, Ag be 0.92%, Ca be 0.28%, Sr be 0.32%, Sn be 0.25%, Ti is 0.19%, and surplus is Mg;
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 6.12%, Zn be 2.55%, Sm be 3.61%, Ag be 0.92%, Ca be 0.84%, Sr be 0.56%, Sn be 0.39%, Ti is 0.22%, and surplus is Mg;
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 10.39%, Zn be 1.87%, Sm be 2.84%, Ag be 0.77%, Ca be 1.14%, Sr be 0.61%, Sn be 0.14%, Ti is 0.14%, and surplus is Mg.
A preparation method for heat resistance magnesium alloy as above, comprises the following steps:
1) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy is taken according to above-mentioned weight percentage, for subsequent use;
2) pure magnesium ingot step 1) taken, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy are respectively at drying and preheating 2h under 180 ~ 200 DEG C of conditions, for subsequent use;
3) by step 2) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain and fine silver ingot after preheating be at CO 2+ SF 6mixed gas protected lower fusing, Mg-Sm master alloy, Mg-Ca master alloy, Al-Ti master alloy and Mg-Sr master alloy is added when being heated to 700 ~ 720 DEG C, insulation 7 ~ 15min, until alloy removes surface scum after all melting, stops after temperature being risen to 730 ~ 740 DEG C heating up, then stir, be cooled to 690 ~ 700 DEG C again, leave standstill 4 ~ 8 min, then aluminium alloy being poured into preheating temperature is in the metal type dies of 250 ~ 300 DEG C, naturally cooling, obtains cast alloy;
4) heat-treated by step 3) gained cast alloy, described thermal treatment carries out solution treatment and ageing treatment successively to cast alloy, and solid solution temperature is 430 ~ 440 DEG C, and the treatment time is 15 ~ 20 hours, then uses the water quenching of 80 ~ 100 DEG C to room temperature; Aging temperature is 220 ~ 260 DEG C, and the treatment time is 16 ~ 24 hours, is then cooled to room temperature in air, and wherein solution treatment is carried out under magnesium oxide powder covers.
Beneficial effect of the present invention:
The present invention is by introducing appropriate rare earth element Sm, alkaline earth element Ca and Sr and other elements A g, Sn, Ti, modification is carried out by the method alloy of multicomponent microalloying, and the cast alloy obtained is heat-treated, Mg-Al-Zn alloy prepared by the present invention has higher room temperature and Testing Tensile Strength at Elevated Temperature, plasticity have also been obtained larger improvement, and microstructure is even; Magnesium alloy cost provided by the invention is lower, melting and thermal treatment process simple.
Embodiment
Below in conjunction with embodiment, the present invention is further elaborated.
Embodiment 1
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 4.79%, Zn be 2.97%, Sm be 2.84%, Ag be 0.92%, Ca be 0.28%, Sr be 0.32%, Sn be 0.25%, Ti is 0.19%, and surplus is Mg;
A preparation method for heat resistance magnesium alloy described above, comprises the following steps:
1) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy is taken according to above-mentioned weight percentage, for subsequent use;
2) pure magnesium ingot step 1) taken, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy are respectively at drying and preheating 2h under 180 DEG C of conditions, for subsequent use;
3) by step 2) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain and fine silver ingot after preheating be at CO 2+ SF 6mixed gas protected lower fusing, Mg-Sm master alloy, Mg-Ca master alloy, Al-Ti master alloy and Mg-Sr master alloy is added when being heated to 710 DEG C, insulation 9min, until alloy removes surface scum after all melting, stops after temperature being risen to 735 DEG C heating up, then stir, be cooled to 700 DEG C again, leave standstill 6 min, then aluminium alloy being poured into preheating temperature is in the metal type dies of 270 DEG C, naturally cooling, obtains cast alloy;
4) heat-treated by step 3) gained cast alloy, described thermal treatment carries out solution treatment and ageing treatment successively to cast alloy, and solid solution temperature is 430 DEG C, and the treatment time is 19 hours, then uses the water quenching of 85 DEG C to room temperature; Aging temperature is 220 DEG C, and the treatment time is 22 hours, is then cooled to room temperature in air, and wherein solution treatment is carried out under magnesium oxide powder covers, and prevents oxidizing fire.
Embodiment 2
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 6.12%, Zn is 2.55%, Sm 3.61%, Ag, 0.92%, Ca 0.84%, Sr, 0.56%, Sn 0.39%, Ti 0.22%, and surplus is Mg;
A preparation method for heat resistance magnesium alloy described above, comprises the following steps:
1) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy is taken according to above-mentioned weight percentage, for subsequent use;
2) pure magnesium ingot step 1) taken, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy are respectively at drying and preheating 2h under 190 DEG C of conditions, for subsequent use;
3) by step 2) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain and fine silver ingot after preheating be at CO 2+ SF 6mixed gas protected lower fusing, Mg-Sm master alloy, Mg-Ca master alloy, Al-Ti master alloy and Mg-Sr master alloy is added when being heated to 705 DEG C, insulation 10min, until alloy removes surface scum after all melting, stops after temperature being risen to 730 DEG C heating up, then stir, be cooled to 690 DEG C again, leave standstill 4min, then aluminium alloy being poured into preheating temperature is in the metal type dies of 280 DEG C, naturally cooling, obtains cast alloy;
4) heat-treated by step 3) gained cast alloy, described thermal treatment carries out solution treatment and ageing treatment successively to cast alloy, and solid solution temperature is 435 DEG C, and the treatment time is 18 hours, then uses the water quenching of 90 DEG C to room temperature; Aging temperature is 230 DEG C, and the treatment time is 20 hours, is then cooled to room temperature in air, and wherein solution treatment is carried out under magnesium oxide powder covers, and prevents oxidizing fire.
Embodiment 3
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 7.36%, Zn be 2.68%, Sm be 1.97%, Ag be 1.74%, Ca be 1.37%, Sr be 0.47%, Sn be 0.68%, Ti is 0.28%, and surplus is Mg;
A preparation method for heat resistance magnesium alloy described above, comprises the following steps:
1) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy is taken according to above-mentioned weight percentage, for subsequent use;
2) pure magnesium ingot step 1) taken, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy are respectively at drying and preheating 2h under 200 DEG C of conditions, for subsequent use;
3) by step 2) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain and fine silver ingot after preheating be at CO 2+ SF 6mixed gas protected lower fusing, Mg-Sm master alloy, Mg-Ca master alloy, Al-Ti master alloy and Mg-Sr master alloy is added when being heated to 720 DEG C, insulation 7min, until alloy removes surface scum after all melting, stops after temperature being risen to 740 DEG C heating up, then stir, be cooled to 700 DEG C again, leave standstill 4min, then aluminium alloy being poured into preheating temperature is in the metal type dies of 280 DEG C, naturally cooling, obtains cast alloy;
4) heat-treated by step 3) gained cast alloy, described thermal treatment carries out solution treatment and ageing treatment successively to cast alloy, and solid solution temperature is 435 DEG C, and the treatment time is 17 hours, then uses the water quenching of 90 DEG C to room temperature; Aging temperature is 240 DEG C, and the treatment time is 18 hours, is then cooled to room temperature in air, and wherein solution treatment is carried out under magnesium oxide powder covers, and prevents oxidizing fire.
Embodiment 4
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 7.98%, Zn be 1.92%, Sm be 2.45%, Ag be 1.52%, Ca be 1.64%, Sr be 0.19%, Sn be 0.83%, Ti is 0.42%, and surplus is Mg;
A preparation method for heat resistance magnesium alloy described above, comprises the following steps:
1) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy is taken according to above-mentioned weight percentage, for subsequent use;
2) pure magnesium ingot step 1) taken, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy are respectively at drying and preheating 2h under 200 DEG C of conditions, for subsequent use;
3) by step 2) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain and fine silver ingot after preheating be at CO 2+ SF 6mixed gas protected lower fusing, Mg-Sm master alloy, Mg-Ca master alloy, Al-Ti master alloy and Mg-Sr master alloy is added when being heated to 700 DEG C, insulation 13min, until alloy removes surface scum after all melting, stops after temperature being risen to 730 DEG C heating up, then stir, be cooled to 695 DEG C again, leave standstill 7min, then aluminium alloy being poured into preheating temperature is in the metal type dies of 290 DEG C, naturally cooling, obtains cast alloy;
4) heat-treated by step 3) gained cast alloy, described thermal treatment carries out solution treatment and ageing treatment successively to cast alloy, and solid solution temperature is 440 DEG C, and the treatment time is 16 hours, then uses the water quenching of 95 DEG C to room temperature; Aging temperature is 250 DEG C, and the treatment time is 16 hours, is then cooled to room temperature in air, and wherein solution treatment is carried out under magnesium oxide powder covers, and prevents oxidizing fire.
Embodiment 5
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 9.07%, Zn be 2.15%, Sm be 3.37%, Ag be 0.39%, Ca be 0.53%, Sr be 0.35%, Sn be 0.47%, Ti is 0.37%, and surplus is Mg;
A preparation method for heat resistance magnesium alloy described above, comprises the following steps:
1) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy is taken according to above-mentioned weight percentage, for subsequent use;
2) pure magnesium ingot step 1) taken, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy are respectively at drying and preheating 2h under 200 DEG C of conditions, for subsequent use;
3) by step 2) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain and fine silver ingot after preheating be at CO 2+ SF 6mixed gas protected lower fusing, Mg-Sm master alloy, Mg-Ca master alloy, Al-Ti master alloy and Mg-Sr master alloy is added when being heated to 700 DEG C, insulation 14min, until alloy removes surface scum after all melting, stops after temperature being risen to 740 DEG C heating up, then stir, be cooled to 700 DEG C again, leave standstill 4min, then aluminium alloy being poured into preheating temperature is in the metal type dies of 300 DEG C, naturally cooling, obtains cast alloy;
4) heat-treated by step 3) gained cast alloy, described thermal treatment carries out solution treatment and ageing treatment successively to cast alloy, and solid solution temperature is 435 DEG C, and the treatment time is 18 hours, then uses the water quenching of 95 DEG C to room temperature; Aging temperature is 250 DEG C, and the treatment time is 18 hours, is then cooled to room temperature in air, and wherein solution treatment is carried out under magnesium oxide powder covers, and prevents oxidizing fire.
Embodiment 6
Containing a Mg-Al-Zn system heat resistance magnesium alloy of Sm, each component and weight percentage thereof are: Al is 10.39%, Zn be 1.87%, Sm be 2.84%, Ag be 0.77%, Ca be 1.14%, Sr be 0.61%, Sn be 0.14%, Ti is 0.14%, and surplus is Mg;
A preparation method for heat resistance magnesium alloy described above, comprises the following steps:
1) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy is taken according to above-mentioned weight percentage, for subsequent use;
2) pure magnesium ingot step 1) taken, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy are respectively at drying and preheating 2h under 190 DEG C of conditions, for subsequent use;
3) by step 2) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain and fine silver ingot after preheating be at CO 2+ SF 6mixed gas protected lower fusing, Mg-Sm master alloy, Mg-Ca master alloy, Al-Ti master alloy and Mg-Sr master alloy is added when being heated to 720 DEG C, insulation 8min, until alloy removes surface scum after all melting, stops after temperature being risen to 730 DEG C heating up, then stir, be cooled to 690 DEG C again, leave standstill 7min, then aluminium alloy being poured into preheating temperature is in the metal type dies of 290 DEG C, naturally cooling, obtains cast alloy;
4) heat-treated by step 3) gained cast alloy, described thermal treatment carries out solution treatment and ageing treatment successively to cast alloy, and solid solution temperature is 435 DEG C, and the treatment time is 19 hours, then uses the water quenching of 95 DEG C to room temperature; Aging temperature is 230 DEG C, and the treatment time is 21 hours, is then cooled to room temperature in air, and wherein solution treatment is carried out under magnesium oxide powder covers, and prevents oxidizing fire.
Comparative example 1
This comparative example Mg-Al-Zn series magnesium alloy is made up of the component of following weight percentage: Al is 6.79%, Zn is 2.39%, and surplus is Mg; Described alloy preparation method is as follows:
According to weight percent content configuration pure magnesium ingot, fine aluminium ingot and pure zinc granule and the loft drier being placed in 200 DEG C carries out drying and preheating, warm up time is 2 hours.By the pure magnesium ingot after preheating, fine aluminium ingot, pure zinc granule at CO 2+ SF 6mixed gas protected lower fusing, be incubated 13 minutes, until remove surface scum after alloy all melts, stop after temperature being risen to 730 DEG C heating up, then stir, then be down to about 695 DEG C, static 6 minutes, then be poured in the metal type dies of preheating by aluminium alloy, the preheating temperature of metal type dies is 280 DEG C, obtains cast alloy; Heat-treated by cast alloy, solid solution temperature is 430 DEG C, and the treatment time is 19 hours, and warm water quench is to room temperature, and hot water temperature is 90 DEG C; Aging temperature is 230 DEG C, and the treatment time is 20 hours, and air cooling is to room temperature, and wherein solution treatment is carried out preventing oxidizing fire under magnesium oxide powder covers.
Comparative example 2
This comparative example Mg-Al-Zn series magnesium alloy is made up of the component of following weight percentage: Al is 9.37%, Zn is 2.17%, and surplus is Mg; Described alloy preparation method is as follows:
According to weight percent content configuration pure magnesium ingot, fine aluminium ingot and pure zinc granule and the loft drier being placed in 200 DEG C carries out drying and preheating, warm up time is 2 hours.By the pure magnesium ingot after preheating, fine aluminium ingot, pure zinc granule at CO 2+ SF 6mixed gas protected lower fusing; be incubated 12 minutes; until remove surface scum after alloy all melts; stop after temperature being risen to 735 DEG C heating up, then stir, then be down to about 700 DEG C; static 5 minutes; then be poured in the metal type dies of preheating by aluminium alloy, the preheating temperature of metal type dies is 290 DEG C, obtains cast alloy.Heat-treated by cast alloy, solid solution temperature is 435 DEG C, and the treatment time is 17 hours, and warm water quench is to room temperature, and hot water temperature is 95 DEG C; Aging temperature is 240 DEG C, and the treatment time is 17 hours, and air cooling is to room temperature, and wherein solution treatment is carried out preventing oxidizing fire under magnesium oxide powder covers.
The present invention is containing the Mg-Al-Zn system heat resistance magnesium alloy tensile strength test method of Sm: sample is processed into 5 times of standard tensile specimen according to standard GB/T 6397-86 " metal stretching experimental sample "; The accurate universal testing machine of Japanese Shimadzu AG-I 250kN carries out tension test, and rate of extension is 1mm/min; During drawing by high temperature, 10 minutes are incubated, then stretch.
Embodiment 1-6 and comparative example 1-2 obtains the room temperature of alloy and the mechanical property of 200 DEG C lists in table 1, as can be seen from the table, when in comparative example 1 and 2, Mg-Al-Zn series magnesium alloy does not add rare earth element Sm, alkaline earth element Ca and Sr and other elements A g, Sn, Ti, the tensile strength of its room temperature, yield strength and elongation are starkly lower than embodiment 1 ~ 6, and alloying element is particularly remarkable to the raising of Elevated Temperature Mechanical Properties of Mg Alloys.
The mechanical property of table 1 heat resistance magnesium alloy of the present invention
Magnalium zinc series magnesium alloy is one of industrial magnesium alloy be most widely used at present, this series alloy has excellent room temperature strength and plasticity, excellent casting and machinability, lower cost, Al element is the first component of this series alloy, is the important alloying element of magnesium alloy, has large solid solubility in magnesium, both ways, one is by forming Mg on its strengthening effect surface 17al 12the second-phase strength of intermetallic compound, two is the solution strengthening being formed sosoloid by Al atom in magnesium matrix.Mg in magnalium zinc series magnesium alloy 17al 12phase thermostability is poor, is easy to softening under high temperature, makes the high-temperature behavior of this series alloy poor.Zn has stronger solution strengthening and ageing strengthening effect in the magnesium alloy, and the interpolation of Zn simultaneously can put forward heavy alloyed plasticity.Rare earth element Sm and alkaline earth element Ca, Sr can form some resistant to elevated temperatures intermetallic compounds with Al element, and these intermetallic compounds are distributed on crystal boundary, instead of part Mg 17al 12phase, changes Mg 17al 12the precipitation state of phase and structure, in addition can crystal grain thinning, delays growing up of crystal grain, improves the elongation of alloy.Ag, Sn, Ti element is the important element improving magnalium series magnesium alloy resistance toheat equally.

Claims (5)

1. the Mg-Al-Zn system heat resistance magnesium alloy containing Sm, it is characterized in that, each component and weight percentage thereof are: Al is 2 ~ 11%, Zn be 1.5 ~ 3%, Sm is 1.8 ~ 4%, Ag is 0.2 ~ 1.8%, Ca is 0.1 ~ 1.9%, Sr be 0.1 ~ 0.7%, Sn is 0.1 ~ 0.9%, Ti is 0.1 ~ 0.5%, and surplus is Mg.
2. the Mg-Al-Zn system heat resistance magnesium alloy containing Sm as claimed in claim 1, it is characterized in that, each component and weight percentage thereof are: Al is 4.79%, Zn is 2.97%, Sm is 2.84%, Ag be 0.92%, Ca be 0.28%, Sr is 0.32%, Sn is 0.25%, Ti is 0.19%, and surplus is Mg.
3. the Mg-Al-Zn system heat resistance magnesium alloy containing Sm as claimed in claim 1, it is characterized in that, each component and weight percentage thereof are: Al is 6.12%, Zn is 2.55%, Sm is 3.61%, Ag be 0.92%, Ca be 0.84%, Sr is 0.56%, Sn is 0.39%, Ti is 0.22%, and surplus is Mg.
4. the Mg-Al-Zn system heat resistance magnesium alloy containing Sm as claimed in claim 1, it is characterized in that, each component and weight percentage thereof are: Al is 10.39%, Zn is 1.87%, Sm is 2.84%, Ag be 0.77%, Ca be 1.14%, Sr is 0.61%, Sn is 0.14%, Ti is 0.14%, and surplus is Mg.
5. a preparation method for heat resistance magnesium alloy as claimed in claim 1, is characterized in that, comprises the following steps:
1) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy is taken according to above-mentioned weight percentage, for subsequent use;
2) pure magnesium ingot step 1) taken, fine aluminium ingot, pure zinc granule, pure tin grain, fine silver ingot, Mg-Sm master alloy, Mg-Sr master alloy, Mg-Ca master alloy and Al-Ti master alloy are respectively at drying and preheating 2h under 180 ~ 200 DEG C of conditions, for subsequent use;
3) by step 2) pure magnesium ingot, fine aluminium ingot, pure zinc granule, pure tin grain and fine silver ingot after preheating be at CO 2+ SF 6mixed gas protected lower fusing, Mg-Sm master alloy, Mg-Ca master alloy, Al-Ti master alloy and Mg-Sr master alloy is added when being heated to 700 ~ 720 DEG C, insulation 7 ~ 15min, until alloy removes surface scum after all melting, stops after temperature being risen to 730 ~ 740 DEG C heating up, then stir, be cooled to 690 ~ 700 DEG C again, leave standstill 4 ~ 8 min, then aluminium alloy being poured into preheating temperature is in the metal type dies of 250 ~ 300 DEG C, naturally cooling, obtains cast alloy;
4) heat-treated by step 3) gained cast alloy, described thermal treatment carries out solution treatment and ageing treatment successively to cast alloy, and solid solution temperature is 430 ~ 440 DEG C, and the treatment time is 15 ~ 20 hours, then uses the water quenching of 80 ~ 100 DEG C to room temperature; Aging temperature is 220 ~ 260 DEG C, and the treatment time is 16 ~ 24 hours, is then cooled to room temperature in air, and wherein solution treatment is carried out under magnesium oxide powder covers.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105018812A (en) * 2015-07-07 2015-11-04 河南科技大学 Heat-resistant magnesium alloy and fabrication method thereof
CN105463282A (en) * 2015-12-03 2016-04-06 嘉瑞科技（惠州）有限公司 Rare earth-magnesium alloy and preparation method thereof
CN107119220A (en) * 2017-05-22 2017-09-01 河南科技大学 A kind of heat resistance magnesium alloy and preparation method thereof
CN107177764A (en) * 2016-03-10 2017-09-19 中国科学院金属研究所 A kind of high strength and low cost cast magnesium alloy and preparation method thereof
CN109457158A (en) * 2018-11-27 2019-03-12 河南科技大学 A kind of corrosion-proof rare earth magnesium alloy and preparation method thereof
CN112680645A (en) * 2020-12-17 2021-04-20 中国科学院长春应用化学研究所 Rare earth Sm-containing self-foaming porous magnesium alloy and preparation method thereof
CN112725673A (en) * 2020-12-28 2021-04-30 中信戴卡股份有限公司 Mg-Al alloy and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN105018812A (en) * 2015-07-07 2015-11-04 河南科技大学 Heat-resistant magnesium alloy and fabrication method thereof
CN105463282A (en) * 2015-12-03 2016-04-06 嘉瑞科技（惠州）有限公司 Rare earth-magnesium alloy and preparation method thereof
CN107177764A (en) * 2016-03-10 2017-09-19 中国科学院金属研究所 A kind of high strength and low cost cast magnesium alloy and preparation method thereof
CN107119220A (en) * 2017-05-22 2017-09-01 河南科技大学 A kind of heat resistance magnesium alloy and preparation method thereof
CN109457158A (en) * 2018-11-27 2019-03-12 河南科技大学 A kind of corrosion-proof rare earth magnesium alloy and preparation method thereof
CN109457158B (en) * 2018-11-27 2020-08-14 河南科技大学 Corrosion-resistant rare earth magnesium alloy and preparation method thereof
CN112680645A (en) * 2020-12-17 2021-04-20 中国科学院长春应用化学研究所 Rare earth Sm-containing self-foaming porous magnesium alloy and preparation method thereof
CN112725673A (en) * 2020-12-28 2021-04-30 中信戴卡股份有限公司 Mg-Al alloy and preparation method thereof

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