CN104152775A - Long-periodic structure reinforced magnesium alloy semi-solid slurry and preparation method thereof - Google Patents
Long-periodic structure reinforced magnesium alloy semi-solid slurry and preparation method thereof Download PDFInfo
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- CN104152775A CN104152775A CN201410413936.7A CN201410413936A CN104152775A CN 104152775 A CN104152775 A CN 104152775A CN 201410413936 A CN201410413936 A CN 201410413936A CN 104152775 A CN104152775 A CN 104152775A
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Abstract
The invention discloses long-periodic structure reinforced magnesium alloy semi-solid slurry and a preparation method thereof. The semi-solid slurry comprises the components of 86.7% of magnesium, 2.2% of nickel, 5.8% of gadolinium and 5.3% of neodymium. The semi-solid slurry is prepared by the following steps: Mg, Ni, Gd and Nd are mixed to smelt under the protection of argon according to the needed elemental composition proportion to obtain an Mn-Ni-Gd-Nd master alloy ingot; the master alloy ingot is put in a stainless steel crucible for renewedly heating, and the temperature is kept; then, the crucible is put in a pulsed magnetic field for condensing; and finally, the Mg-Ni-Gd-Nd semi-solid slurry is obtained. The semi-solid slurry belongs to a high-strength and high-toughness magnesium alloy, and is suitable for preparing parts with complex shapes; and the preparation method has such advantages as easy process control, better composition control and no composition pollution.
Description
Technical field
The present invention relates to alloy semi-solid slurry of a kind of metallic substance technical field and preparation method thereof, be specifically related to a kind of long-periodic structure and strengthen magnesium alloy semisolid slurry and preparation method thereof.
Background technology
Magnesium alloy is the lightest structural metallic materials in current practical engineering application, there is density little, specific tenacity, specific rigidity are high, casting, damping, machinability is good and the feature such as good stability of the dimension, make it at aspects such as realizing lightweight, reduction energy consumption, minimizing environmental pollution, there is remarkable effect, in fields such as the industrial circles such as automobile, defence and military, aerospace, electronics, machinery and household supplies and sports equipments, just obtaining increasingly extensive application.Yet, the Basic Problems such as the obdurability that exists in magnesium alloy research and application is low, plasticity is poor, finding effective strengthening means is key foundation problems of research and development high-strength magnesium alloy.Magnesium alloy is carried out to Composition Design, and introducing effective strengthening phase is the important means of exploitation high-strength magnesium alloy.The nearly more than ten years, a kind of magnesium alloy of new long-periodic structure strengthening has attracted people's attention.The Mg-Y-Zn magnesium alloy of long-periodic structure strengthening prepared by employing Rapid Solidification Powder metallurgical method, room temperature tensile yield strength is up to 610 MPa, and unit elongation also surpasses 5%; During 423K, yield strength also reaches 510 MPa, and this is the highest magnesium alloy of intensity of preparing at present.Along with research deepens continuously, investigator generally believes that the magnesium alloy that long-periodic structure strengthens can become high-strength high-toughness magnesium alloy of new generation.
The patent of invention of Kawamura Yoshihito " high-strength high-toughness magnesium alloy and preparation method thereof " (CN 10145417 B, on May 25th, 2011) proposing Mg-Ni-RE magnesium alloy is the high-strength high-toughness magnesium alloy that long-periodic structure strengthens, and proposition is over against two class material processing methods of this magnesium alloy, one class is rapid solidification, and another kind of is plastic processing method.Yet this two classes material processing method all cannot obtain complex-shaped, the product that volume is larger.Recently, a kind of new materials processing technology obtains people's attention, and this technology is called semi-solid state forming technique.The ultimate principle of semi-solid state forming technique is: adopt certain method to obtain and have semi solid slurry (base) material of non-tree-crystal shape tissue, and by the mode of pressurization, make its solidification forming in difform die cavity.The method can obtain complex-shaped, and the larger product of volume, can reduce the casting flaw in its formation of parts simultaneously, has improved the mechanical property of part, is a kind of near-net-shape technology, can realize less, without surplus, process.Therefore, semi-solid state forming technique is applied to the processing that long-periodic structure strengthens magnesium alloy, can further expands the range of application of high-strength high-toughness magnesium alloy, meet the aerospace requirement day by day harsh to material.
The key of semi-solid processing is the desirable semi-solid metal slurry how to make.That is to say, realize the key that long-periodic structure strengthens the semi-solid processing of magnesium alloy, namely prepare the semi solid slurry that long-periodic structure strengthens magnesium alloy.Through literature query, not yet find that there is at present and close the report that long-periodic structure strengthens the semi solid slurry research of Mg-Ni-RE magnesium alloy.
Summary of the invention
The object of the invention is to overcome the deficiency of existing research, provide a kind of long-periodic structure to strengthen Mg-Ni-Gd-Nd magnesium alloy semisolid slurry and preparation method thereof, solve semi-solid formation key problem in technology problem---the preparation of semi solid slurry, for the semi-solid-state shaping of high-strength high-toughness magnesium alloy provides technical support.
The present invention is achieved by the following technical solutions:
Semi solid slurry involved in the present invention, is the Mg-Ni-Gd-Nd alloy semi-solid slurry that a kind of long-periodic structure strengthens, and this pulp bales contains following component (by weight percentage): 86.7 % magnesium, 2.2 % nickel, 5.8 % gadoliniums, 5.3 % neodymiums.
The preparation method of magnesium alloy semisolid slurry involved in the present invention, comprises the following steps:
(1), according to alloying constituent 86.7 % magnesium, 2.2 % nickel, 5.8 % gadoliniums, 5.3 % neodymiums, prepare magnesium, nickel and rare earth gadolinium and neodymium raw material; Above-mentioned magnesium, nickel, gadolinium, neodymium raw material are purity more than 99.9%.
(2), the raw material of (1) step is put into plumbago crucible, adopt high-frequency induction furnace melting, high-frequency induction heat electric stream is increased to 400 amperes gradually by 150 amperes, realizes the slow heating to raw material, until fusing obtains master alloy ingot.
Described melting, its process maintains 45 minutes: within first 5 minutes, electric current is 150 amperes, and within 10 minutes afterwards, electric current is 250 amperes, and within last 30 minutes, electric current is 400 amperes.
Described melting and being melted in sealed chamber is carried out, and uses plumbago crucible, and atmosphere is the straight argon atmosphere that purity is greater than 99.99%, and atmosphere pressures is 1 normal atmosphere.
(3), master alloy ingot that (2) step is obtained puts into Stainless Steel Crucible, in resistance furnace, reheat to 600 ℃, and be incubated 20 minutes.
Described heat-processed is carried out under argon shield, and atmosphere is the straight argon atmosphere that argon purity is greater than 99.99%.
(4), (3) step is reheated after and Stainless Steel Crucible that mother alloy is housed be placed in pulsed magnetic field, alloy solidifies and makes magnesium alloy semisolid slurry under pulsed magnetic field action.
The intensity of described pulsed magnetic field is by voltage control, and applied voltage is 350 V; The frequency of pulsed magnetic field is 20 hertz; The pulsed magnetic field action time is 5 minutes.
Magnesium alloy semisolid slurry provided by the invention is the magnesium alloy semisolid slurry that long-periodic structure strengthens, and belongs to high-strength high-toughness magnesium alloy; Preparation method of semisolid state slurry thereof provided by the invention, process is easily controlled, and Composition Control is relatively good, without composition, pollutes, and is applicable to adopting semi-solid state forming technique to prepare complex-shaped part.
Accompanying drawing explanation
Fig. 1 is the XRD diffraction spectra of embodiment;
Fig. 2 is the metallographic structure figure of embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented take technical solution of the present invention under prerequisite, has provided detailed embodiment and concrete operating process.
Embodiment: Mg-Gd-Nd-Ni magnesium alloy semisolid slurry, this pulp bales contains following component (by weight percentage): 86.7 % magnesium, 2.2 % nickel, 5.8 % gadoliniums, 5.3 % neodymiums.
The first step, according to alloying constituent 86.7 % magnesium, 2.2 % nickel, 5.8 % gadoliniums, 5.3 % neodymiums, prepare magnesium, nickel and rare earth gadolinium and neodymium raw material, magnesium used, nickel, gadolinium, neodymium raw material are purity more than 99.9%, nickel, gadolinium, neodymium are fine granularity, and size is less than 1mm.
Second step, the raw material of the first step is put into plumbago crucible, adopt high-frequency induction furnace melting, within first 5 minutes, electric current is 150 amperes, within 10 minutes afterwards, electric current is 250 amperes, and within last 30 minutes, electric current is 400 amperes, realizes thus the slow heating to raw material, until fusing obtains master alloy ingot.
The 3rd step, puts into Stainless Steel Crucible by above-mentioned master alloy ingot, reheats to 600 ℃, and be incubated 20 minutes in resistance furnace.
The 4th step, the Stainless Steel Crucible that mother alloy is housed after the 3rd step is reheated is placed in pulsed magnetic field, and pulsed magnetic field voltage is 350 V, frequency is 20 hertz, be 5 minutes action time, and alloy solidifies under pulsed magnetic field action, makes magnesium alloy semisolid slurry.
From the XRD diffraction spectra of Fig. 1 embodiment, embodiment, by a-Mg phase and long-periodic structure phase X phase composite, that is to say it is the magnesium alloy being strengthened by long-periodic structure.By Fig. 2, show that semi solid slurry is by the long-periodic structure phase composite of white a-Mg phase and grey.
Claims (8)
1. long-periodic structure strengthens a magnesium alloy semisolid slurry, and this semi solid slurry is Mg-Ni-Gd-Nd alloy, and its composition consists of 86.7 % magnesium, 2.2 % nickel, 5.8 % gadoliniums, 5.3 % neodymiums.
2. long-periodic structure strengthens a preparation method for magnesium alloy semisolid slurry, comprises the steps:
The first step, according to alloying constituent 86.7 % magnesium, 2.2 % nickel, 5.8 % gadoliniums, 5.3 % neodymiums, prepare magnesium, nickel and rare earth gadolinium and neodymium raw material;
Second step, the raw material of the first step is put into plumbago crucible, adopt high-frequency induction furnace melting, high-frequency induction heat electric stream is increased to 400 amperes gradually by 150 amperes, realizes the slow heating to raw material, until fusing obtains master alloy ingot;
The 3rd step, the master alloy ingot that the 3rd step is obtained are put into Stainless Steel Crucible, reheat to 600 ℃, and be incubated 20 minutes in resistance furnace;
The 4th step, the 3rd step is reheated after and Stainless Steel Crucible that mother alloy is housed be placed in pulsed magnetic field, alloy solidifies and makes magnesium alloy semisolid slurry under pulsed magnetic field action.
3. long-periodic structure according to claim 2 strengthens the preparation method of magnesium alloy semisolid slurry, and in the first step, described magnesium, nickel, gadolinium, neodymium raw material are purity more than 99.9%.
4. according to the long-periodic structure described in claim 2, strengthen the preparation method of magnesium alloy semisolid slurry, in second step, the described fusion process time is 45 minutes: within first 5 minutes, electric current is 150 amperes, within 10 minutes afterwards, electric current is 250 amperes, and within last 30 minutes, electric current is 400 amperes.
5. according to the long-periodic structure described in claim 2, strengthen the preparation method of magnesium alloy semisolid slurry, in second step, described melting and being melted in sealed chamber is carried out, and uses plumbago crucible, atmosphere is the straight argon atmosphere that purity is greater than 99.99%, and atmosphere pressures is 1 normal atmosphere.
6. according to the long-periodic structure described in claim 2, strengthen the preparation method of magnesium alloy semisolid slurry, in the 3rd step, described heat-processed is carried out under argon shield, and atmosphere is the straight argon atmosphere that argon purity is greater than 99.99%, and atmosphere pressures is 1 normal atmosphere.
7. according to the long-periodic structure described in claim 2, strengthen the preparation method of magnesium alloy semisolid slurry, in the 3rd step, crucible used is Stainless Steel Crucible, and described holding temperature is 600 ℃, and soaking time is 20 minutes.
8. according to the long-periodic structure described in claim 2, strengthen the preparation method of magnesium alloy semisolid slurry, in the 4th step, described process of setting carries out under pulsed magnetic field, and the intensity of described pulsed magnetic field is by voltage control, and applied voltage is 350 V; The frequency of pulsed magnetic field is 20 hertz; The pulsed magnetic field action time is 5 minutes.
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Cited By (8)
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| CN105132776A (en) * | 2015-08-26 | 2015-12-09 | 南昌航空大学 | In-situ synthesized high-strength heat-resistant Mg-Cd-based composite material and preparation method thereof |
| CN106086559A (en) * | 2016-06-22 | 2016-11-09 | 南昌航空大学 | A kind of long-periodic structure strengthens Mg RE Ni magnesium alloy semi-solid state blank and preparation method thereof mutually |
| CN106392044A (en) * | 2016-09-20 | 2017-02-15 | 华中科技大学 | Method for adjusting and regulating long-periodic structure phase of magnesium alloy |
| US10266923B2 (en) | 2017-01-16 | 2019-04-23 | Magnesium Elektron Limited | Corrodible downhole article |
| US10329643B2 (en) | 2014-07-28 | 2019-06-25 | Magnesium Elektron Limited | Corrodible downhole article |
| US11167343B2 (en) | 2014-02-21 | 2021-11-09 | Terves, Llc | Galvanically-active in situ formed particles for controlled rate dissolving tools |
| US11365164B2 (en) | 2014-02-21 | 2022-06-21 | Terves, Llc | Fluid activated disintegrating metal system |
| US11649526B2 (en) | 2017-07-27 | 2023-05-16 | Terves, Llc | Degradable metal matrix composite |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11167343B2 (en) | 2014-02-21 | 2021-11-09 | Terves, Llc | Galvanically-active in situ formed particles for controlled rate dissolving tools |
| US11613952B2 (en) | 2014-02-21 | 2023-03-28 | Terves, Llc | Fluid activated disintegrating metal system |
| US11365164B2 (en) | 2014-02-21 | 2022-06-21 | Terves, Llc | Fluid activated disintegrating metal system |
| US10329643B2 (en) | 2014-07-28 | 2019-06-25 | Magnesium Elektron Limited | Corrodible downhole article |
| US10337086B2 (en) | 2014-07-28 | 2019-07-02 | Magnesium Elektron Limited | Corrodible downhole article |
| CN105132776A (en) * | 2015-08-26 | 2015-12-09 | 南昌航空大学 | In-situ synthesized high-strength heat-resistant Mg-Cd-based composite material and preparation method thereof |
| CN106086559B (en) * | 2016-06-22 | 2018-05-18 | 南昌航空大学 | A kind of long-periodic structure mutually enhances Mg-RE-Ni magnesium alloy semi-solid state blanks and preparation method thereof |
| CN106086559A (en) * | 2016-06-22 | 2016-11-09 | 南昌航空大学 | A kind of long-periodic structure strengthens Mg RE Ni magnesium alloy semi-solid state blank and preparation method thereof mutually |
| CN106392044B (en) * | 2016-09-20 | 2019-03-05 | 华中科技大学 | A method of the long-periodic structure phase of regulation magnesium alloy |
| CN106392044A (en) * | 2016-09-20 | 2017-02-15 | 华中科技大学 | Method for adjusting and regulating long-periodic structure phase of magnesium alloy |
| US10266923B2 (en) | 2017-01-16 | 2019-04-23 | Magnesium Elektron Limited | Corrodible downhole article |
| US11649526B2 (en) | 2017-07-27 | 2023-05-16 | Terves, Llc | Degradable metal matrix composite |
| US11898223B2 (en) | 2017-07-27 | 2024-02-13 | Terves, Llc | Degradable metal matrix composite |
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