CN102978492A - Rare-earth and Zr reinforced Mg-Li based wrought magnesium alloy and preparation method thereof - Google Patents
Rare-earth and Zr reinforced Mg-Li based wrought magnesium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of metal materials and metallurgy, and particularly relates to a rare-earth and Zr reinforced Mg-Li based wrought magnesium alloy and a preparation method thereof. The magnesium alloy adopts Mg-Li based magnesium alloy as the basis; the rare elements and Zr are adopted to be used as the alloying elements; and the Mg-Li based wrought magnesium alloy comprises the following components in percentage by weight: 1.5 to 5.5% of Li, 1% of rare earth element, 0.2 to 0.6% of Zr, and the balance of Mg. The preparation method comprises the following steps in sequence: melting the alloy; casting to an iron crucible which is pre-heated to reach 200 DEG C, thus obtaining an ingot casting; transferring the ingot casting wrapped by the aluminum foil into an iron container; completely covering the ingot casting by fine sand; placing the container into a heat treatment furnace for heat treating; turning; processing into an alloy bar of Phi 46mm; processing the alloy bar by a reverse extruding device so as to obtain a magnesium alloy extruding bar; and carrying out T6 heat treatment on the bar. By adopting the preparation method, the performances of the Mg-Li alloy can be reinforced, and the high plastic deformation capacity of the Mg-Li alloy can be remained; and the tensile mechanical properties of the Mg-Li alloy at room temperature can reach the following levels: the tensile strength Rm is 210MPa, the yield strength Rp 0.2 is 142MPa, and the elongation percentage A is of 23.5%.
Description
Technical field
The invention belongs to metallic substance and metallurgical technology field, particularly a kind of Mg-Li base wrought magnesium alloys that utilizes rare earth and Zr reinforcement and preparation method thereof.
Background technology
Magnesium alloy have density little, than advantages such as strong height and vibration damping, electromagnetic wave shielding and machining property are good, be the light-weighted ideal material of structure, the in recent years research of magnesium alloy and application obtains paying much attention to.Wherein, as an important system in the magnesium alloy, Mg-Li base magnesium alloy is present the lightest alloy, is one of alloy system of the tool potentiality of the ultralight high strength alloy of development.Than other magnesium alloy, Mg-Li base magnesium alloy shows very good plastic deformation ability usually, this is owing to the increase along with Li content, this is that the phase structure of alloy of alloy will occur by close-packed hexagonal-close-packed hexagonal+body-centered cubic-body-centred cubic transformation, because body-centered cubic crystal structure has higher symmetry and more sliding system, therefore show high plastic deformation ability.In addition, Li can make the axial ratio (c/a) of magnesium and magnesium alloy descend, and reduces dislocation along the critical resolved shear stress of cylinder and conical surface slippage.Therefore, along with the increase of body-centered cubic crystal structure phase content in alloy, the plasticity of Mg-Li base magnesium alloy also increases thereupon.Yet it is not high that this alloy also exists absolute strength, and solidity to corrosion extreme difference, melting technology are complicated, easily oxidation in the heat treatment process, take off the critical problem such as Li, have restricted greatly development and the application of Mg-Li base magnesium alloy.Intensity aspect particularly, the not enough 100MPa of the tensile strength of simple Mg-Li binary alloy, yield strength is not enough 70MPa then.Therefore, improve the absolute strength of Mg-Li base magnesium alloy and keep its good plastic deformation ability, studying rational heat treating regime is that alloy and the Application Areas of expanding magnesium alloy are significant to developing this.
Alloying is to improve the important method of magnesium alloy strength, and wherein, rare earth element is the important reinforcement constituent element of magnesium alloy, and this is because rare earth element can form with Mg the intermetallic compound of plurality of stable, such as Mg
12La
2, Mg
3Nd etc., this has exactly remedied the Mg-Li binary alloy and has lacked the deficiency of stablizing strengthening phase, and these magnesium rare earth intermetallic compounds can reach strengthening effect, and improve thermostability, creep resistance, hot strength and the solidity to corrosion etc. of magnesium alloy.Zr is to the strengthening effect highly significant of Mg-Li base alloy, also can obviously improve the creep resistance of alloy, its mechanism is considered to, and: Zr can refinement recrystallized structure, thereby be conducive to obtain tiny equiax crystal, and the Zr solute atoms suppresses dislocation moving and impels homogeneous deformation.
Summary of the invention
For deficiency of the prior art, the invention provides a kind of Mg-Li base wrought magnesium alloys that utilizes rare earth and Zr reinforcement and preparation method thereof, purpose is to utilize the means of alloying to improve the absolute strength of Mg-Li base magnesium alloy and keep its good plastic deformation ability.
A kind of Mg-Li base wrought magnesium alloys that utilizes rare earth and Zr to strengthen of the present invention take Mg-Li base magnesium alloy as base, adds rare earth element and Zr as the alloying constituent element, its chemical ingredients is by mass percentage: Li1.5% ~ 5.5%, rare earth element 1%, Zr0.2 ~ 0.6%, surplus is Mg.
Wherein, described rare earth element is Gd, La, Nd, Er, ML or MC, and wherein ML is rich La mishmetal, and its chemical ingredients is La by mass percentage〉60%, all the other are Ce and Y; MC is rich Ce mishmetal, and its chemical ingredients is Ce by mass percentage〉50%, all the other are La, Nd and Pr.
A kind of preparation method who utilizes the Mg-Li base wrought magnesium alloys of rare earth and Zr reinforcement of the present invention may further comprise the steps:
(1) adopts the melting resistance furnace, MAGNESIUM METAL is heated to 710 ℃ ~ 730 ℃ fusings, adopts No. five flux that the MAGNESIUM METAL melt is carried out purifying treatment, melt is warming up to 780 ℃ after stirring, add and contain 1% rare earth element master alloy, contain the Mg-Zr master alloy of 0.2 ~ 0.6%Zr; Treat that melt temperature is down to 660 ℃ ~ 670 ℃, add 1.5% ~ 5.5% Li with adding the lithium cover, and at the following vertical stirring 3 ~ 5min of melt 2/3 degree of depth, be warming up to 720 ℃ that melt leaves standstill 30min; This fusion-casting process utilizes volume ratio CO
2: SF
6=20:1's is mixed gas protected, to prevent burning;
(2) metal melt is poured in the iron crucible that is preheating to 200 ℃, obtains ingot casting;
(3) with the alloy cast ingot thick aluminium foil double wrapped of 0.1mm, and extrude the air in the slit between aluminium foil and the ingot casting, make the tight applying in surface of aluminium foil and ingot casting, the ingot casting of aluminium foil parcel is positioned in the container made of iron and is that the fine sand of 0.25mm is buried ingot casting fully with particle diameter, burying depth is 100mm, container is put into heat treatment furnace carry out homogenizing thermal treatment, concrete system is for being heated to 300 ~ 400 ℃, insulation 12 ~ 48h;
(4) ingot casting after the thermal treatment is carried out turning, remove the surface oxidation part, be processed as the alloy bar material of Φ 46mm;
(5) utilize reverse squeezing device, on 300 tons of oil presses, with the extrusion speed extruded alloy of 5.0m/min, extrusion ratio is 33 or 15, obtains respectively the extruded bar from magnesium alloy of Φ 8mm or Φ 12mm;
(6) the alloy extruded bars that obtains after will pushing carries out T6 thermal treatment, and concrete system carries out timeliness thermal treatment at 90 ℃ after being 380 ℃ * 1h solid solution shrend, and soaking time is 8 ~ 16h.
Reverse squeezing device described in the step (5) comprises extrusion stem, extrusion mould, container, extruding pad and the extruding base of hollow.Be equipped with container at the extruding base, the container inner bottom part is equipped with the extruding pad, and extruding pad top is equipped with extrusion mould, and the extrusion mould top is equipped with the extrusion stem of hollow.Wherein extrusion mould is the right cylinder of hollow, right cylinder inside is modular angle section, pre-work band, sizing work band and outlet section from top to bottom successively, modular angle is 30 ~ 45 °, the diameter of outlet section is greater than the diameter of work band, pre-work band diameter is greater than sizing work band diameter, the ratio of two land lengths is 0.5 ~ 0.8, and the sizing land length is 4 ~ 8mm.Before the extruding, adopt grease based on molybdenum disulfide lithium as lubricant, evenly spread upon on the inwall of extrusion mould inwall, blank surface and container.
Beneficial effect of the present invention is:
The present invention strengthens the Mg-Li alloy and keeps its good plastic deformation ability by add rare earth (Gd, La, Nd, Er, ML and MC) and Zr in Mg-Li dibasic magnesium alloy; Utilize the room temperature tensile mechanical property after the Mg-Li base wrought magnesium alloys extruded bars T6 thermal treatment that rare earth and Zr strengthen can reach: tensile strength R
mBe 210MPa, yield strength R
P0.2Be 142MPa, unit elongation A is 23.5%.
Description of drawings
Fig. 1 is the magnesium alloy tension specimen dimensioned drawing of embodiment of the invention preparation;
Fig. 2 is the typical cast structure of the magnesium alloy that makes of the embodiment of the invention 1;
Fig. 3 is the typical gold phase constitution of the extruded bar from magnesium alloy that makes of the embodiment of the invention 1;
Fig. 4 is the typical cast structure of the magnesium alloy that makes of the embodiment of the invention 2;
Fig. 5 is the typical gold phase constitution of the extruded bar from magnesium alloy that makes of the embodiment of the invention 2;
Fig. 6 is the typical cast structure of the magnesium alloy that makes of the embodiment of the invention 3;
Fig. 7 is the typical gold phase constitution of the extruded bar from magnesium alloy that makes of the embodiment of the invention 3;
Fig. 8 is the typical cast structure of the magnesium alloy that makes of the embodiment of the invention 4;
Fig. 9 is the typical gold phase constitution of the extruded bar from magnesium alloy that makes of the embodiment of the invention 4;
Figure 10 is the typical cast structure of the magnesium alloy that makes of the embodiment of the invention 5;
Figure 11 is the typical gold phase constitution of the extruded bar from magnesium alloy that makes of the embodiment of the invention 5;
Figure 12 is the typical cast structure of the magnesium alloy that makes of the embodiment of the invention 6;
Figure 13 is the typical gold phase constitution of the extruded bar from magnesium alloy that makes of the embodiment of the invention 6.
Embodiment
The present invention will be further described below in conjunction with embodiment.
The metaloscope model of using in the present embodiment is Leica MPS30.
Mg, Li adopt one-level magnesium ingot (99.95%), lithium ingot (99.9%) to add in the present embodiment, rare earth element and Zr all adopt the master alloy form to add, and each master alloy forms massfraction and is respectively: Mg-25%Gd, Mg-22.18%La, Mg-20.11%Nd, Mg-10.09%Er, Mg-20%ML, Mg-21%MC and Mg-30%Zr.
Embodiment 1
(1) adopts the melting resistance furnace, MAGNESIUM METAL is heated to 720 ℃ of fusings, adopt No. five flux that the MAGNESIUM METAL melt is carried out purifying treatment, melt is warming up to 780 ℃ after stirring, add the Mg-Gd master alloy that contains 1%Gd and the Mg-Zr master alloy that contains 0.4% Zr, treats that melt temperature is down to 660 ℃, with the Li that adds lithium cover adding 3%, and at the following vertical stirring 4min of melt 2/3 degree of depth, being warming up to 720 ℃, melt left standstill 30 minutes;
(2) above fusion-casting process utilizes volume ratio CO
2: SF
6The protection of=20:1 gas mixture to prevent burning, is poured into metal liquid in the iron crucible that is preheating to 200 ℃, obtains ingot casting, and chemical analysis shows the Mg-3.03Li-1.16Gd-0.37Zr that consists of of ingot casting;
(3) with the alloy cast ingot thick aluminium foil double wrapped of 0.1mm, and extrude the air in the slit between aluminium foil and the ingot casting, make the tight applying in surface of aluminium foil and ingot casting, the ingot casting of aluminium foil parcel is positioned in the container made of iron and is that the fine sand of 0.25mm is buried ingot casting fully with particle diameter, burying depth is 100mm, container is put into heat treatment furnace carry out homogenizing thermal treatment, concrete system is incubated 24 hours for being heated to 300 ℃; The typical cast structure of alloy as shown in Figure 2 after the thermal treatment;
(4) after the thermal treatment ingot casting is carried out turning, remove the surface oxidation part, be processed as the alloy bar material of Φ 46mm;
(5) utilize reverse squeezing device, on 300 tons of oil presses, with the extrusion speed extruded alloy of 5.0m/min, obtain the extruded bar from magnesium alloy of Φ 12mm, extrusion ratio is 15, and the typical gold phase constitution of alloy extruded bars as shown in Figure 3;
(6) the alloy extruded bars that obtains after will pushing carries out T6 thermal treatment, and concrete system carries out timeliness thermal treatment at 90 ℃ after being 380 ℃ * 1h solid solution shrend, and soaking time is 14 hours.
As shown in Figure 1 tension specimen is processed in its sampling, carries out room temperature tensile at the Instron8032 drawing machine, draw speed is 2mm/min, and the room temperature tensile mechanical property is as shown in table 1, and mean value is respectively: tensile strength R
m=189MPa, yield strength R
P0.2=142MPa, unit elongation A=23.5%.
Embodiment 2
(1) adopts the melting resistance furnace, MAGNESIUM METAL is heated to 730 ℃ of fusings, adopt No. five flux that the MAGNESIUM METAL melt is carried out purifying treatment, melt is warming up to 780 ℃ after stirring, add the Mg-La master alloy that contains 1%La and the Mg-Zr master alloy that contains 0.4% Zr, treats that melt temperature is down to 660 ℃, with the Li that adds lithium cover adding 1.5%, and at the following vertical stirring 3min of melt 2/3 degree of depth, being warming up to 720 ℃, melt left standstill 30 minutes;
(2) above fusion-casting process utilizes volume ratio CO
2: SF
6The protection of=20:1 gas mixture to prevent burning, is poured into metal liquid in the iron crucible that is preheating to 200 ℃, obtains ingot casting, and chemical analysis shows the Mg-1.53Li-0.71La-0.35Zr that consists of of ingot casting;
(3) with the alloy cast ingot thick aluminium foil double wrapped of 0.1mm, and extrude the air in the slit between aluminium foil and the ingot casting, make the tight applying in surface of aluminium foil and ingot casting, the ingot casting of aluminium foil parcel is positioned in the container made of iron and is that the fine sand of 0.25mm is buried fully with particle diameter, burying depth is 100mm, container is put into heat treatment furnace carry out homogenizing thermal treatment, concrete system is incubated 24 hours for being heated to 300 ℃; The typical cast structure of alloy as shown in Figure 4 after the thermal treatment;
(4) after the thermal treatment ingot casting is carried out turning, be processed as the alloy bar material of Φ 46mm;
(5) utilize reverse squeezing device, on 300 tons of oil presses, with the extrusion speed extruded alloy of 5.0m/min, obtain the extruded bar from magnesium alloy of Φ 12mm, extrusion ratio is 15, and the typical gold phase constitution of alloy extruded bars as shown in Figure 5;
(6) the alloy extruded bars that obtains after will pushing carries out T6 thermal treatment, and concrete system carries out timeliness thermal treatment at 90 ℃ after being 380 ℃ * 1h solid solution shrend, and soaking time is 16 hours.
As shown in Figure 1 tension specimen is processed in its sampling, carries out room temperature tensile at the Instron8032 drawing machine, draw speed is 2mm/min, and the room temperature tensile mechanical property is as shown in table 2, and mean value is respectively: tensile strength R
m=192MPa, yield strength R
P0.2=112MPa, unit elongation A=11.5%.
Embodiment 3
(1) adopts the melting resistance furnace, MAGNESIUM METAL is heated to 730 ℃ of fusings, adopt No. five flux that the MAGNESIUM METAL melt is carried out purifying treatment, melt is warming up to 780 ℃ after stirring, add the Mg-Nd master alloy that contains 1%Nd and the Mg-Zr master alloy that contains 0.2% Zr, treats that melt temperature is down to 670 ℃, with the Li that adds lithium cover adding 4%, and at the following vertical stirring 4min of melt 2/3 degree of depth, being warming up to 720 ℃, melt left standstill 30 minutes;
(2) above fusion-casting process utilizes volume ratio CO
2: SF
6The protection of=20:1 gas mixture to prevent burning, is poured into metal liquid in the iron crucible that is preheating to 200 ℃, obtains ingot casting, and chemical analysis shows the Mg-4.05Li-1.11Nd-0.21Zr that consists of of ingot casting;
(3) with the alloy cast ingot thick aluminium foil double wrapped of 0.1mm, and extrude the air in the slit between aluminium foil and the ingot casting, make the tight applying in surface of aluminium foil and ingot casting, the ingot casting of aluminium foil parcel is positioned in the container made of iron and is that the fine sand of 0.25mm is buried fully with particle diameter, burying depth is 100mm, container is put into heat treatment furnace carry out homogenizing thermal treatment, and concrete system is for being heated to 300 ℃, be incubated 48 hours, the typical cast structure of alloy as shown in Figure 6 after the thermal treatment;
(4) after the thermal treatment ingot casting is carried out turning, be processed as the alloy bar material of Φ 46mm;
(5) utilize reverse squeezing device, on 300 tons of oil presses, with the extrusion speed extruded alloy of 5.0m/min, obtain the extruded bar from magnesium alloy of Φ 12mm, extrusion ratio is 15, and the typical gold phase constitution of alloy extruded bars as shown in Figure 7;
(6) the alloy extruded bars that obtains after will pushing carries out T6 thermal treatment, and concrete system carries out timeliness thermal treatment at 90 ℃ after being 380 ℃ * 1h solid solution shrend, and soaking time is 12 hours.
As shown in Figure 1 tension specimen is processed in its sampling, carries out room temperature tensile at the Instron8032 drawing machine, draw speed is 2mm/min, and the room temperature tensile mechanical property is as shown in table 3, and mean value is respectively: tensile strength R
m=197MPa, yield strength R
P0.2=141MPa, unit elongation A=13.5%.
Embodiment 4
(1) adopts the melting resistance furnace, MAGNESIUM METAL is heated to 720 ℃ of fusings, adopt No. five flux that the MAGNESIUM METAL melt is carried out purifying treatment, melt is warming up to 780 ℃ after stirring, add the Mg-Er master alloy that contains 1%Er and the Mg-Zr master alloy that contains 0.2% Zr, treats that melt temperature is down to 670 ℃, with the Li that adds lithium cover adding 2%, and at the following vertical stirring 3min of melt 2/3 degree of depth, being warming up to 720 ℃, melt left standstill 30 minutes;
(2) above fusion-casting process utilizes volume ratio CO
2: SF
6The protection of=20:1 gas mixture to prevent burning, is cast to metal liquid in the iron crucible that is preheating to 200 ℃, obtains ingot casting, and chemical analysis shows the Mg-2.06Li-0.68Er-0.24Zr that consists of of ingot casting;
(3) with the alloy cast ingot thick aluminium foil double wrapped of 0.1mm, and extrude the air in the slit between aluminium foil and the ingot casting, make the tight applying in surface of aluminium foil and ingot casting, the ingot casting of aluminium foil parcel is positioned in the container made of iron and is that the fine sand of 0.25mm is buried fully with particle diameter, burying depth is 100mm, container is put into heat treatment furnace carry out homogenizing thermal treatment, and concrete system is for being heated to 400 ℃, be incubated 12 hours, the typical cast structure of alloy as shown in Figure 8 after the thermal treatment;
(4) after the thermal treatment ingot casting is carried out turning, be processed as the alloy bar material of Φ 46mm;
(5) utilize reverse squeezing device, on 300 tons of oil presses, with the extrusion speed extruded alloy of 5.0m/min, obtain the extruded bar from magnesium alloy of Φ 8mm, extrusion ratio is 33, and the typical gold phase constitution of alloy extruded bars as shown in Figure 9;
(6) the alloy extruded bars that obtains after will pushing carries out T6 thermal treatment, and concrete system carries out timeliness thermal treatment at 90 ℃ after being 380 ℃ * 1h solid solution shrend, and soaking time is 8 hours.
As shown in Figure 1 tension specimen is processed in its sampling, carries out room temperature tensile at the Instron8032 drawing machine, draw speed is 2mm/min, and the room temperature tensile mechanical property is as shown in table 4, and mean value is respectively: tensile strength R
m=210MPa, yield strength R
P0.2=138MPa, unit elongation A=13.0%.
(1) adopts the melting resistance furnace, MAGNESIUM METAL is heated to 710 ℃ of fusings, adopt No. five flux that the MAGNESIUM METAL melt is carried out purifying treatment, melt is warming up to 780 ℃ after stirring, add the Mg-ML master alloy that contains 1%ML and the Mg-Zr master alloy that contains 0.6% Zr, treats that melt temperature is down to 660 ℃, with the Li that adds lithium cover adding 3.5%, and at the following vertical stirring 4min of melt 2/3 degree of depth, being warming up to 720 ℃, melt left standstill 30 minutes;
(2) above fusion-casting process utilizes volume ratio CO
2: SF
6The protection of=20:1 gas mixture to prevent burning, is poured into metal liquid in the iron crucible that is preheating to 200 ℃, obtains ingot casting, and chemical analysis shows the Mg-3.35Li-0.65ML-0.54Zr that consists of of ingot casting;
(3) with the alloy cast ingot thick aluminium foil double wrapped of 0.1mm, and extrude the air in the slit between aluminium foil and the ingot casting, make the tight applying in surface of aluminium foil and ingot casting, the ingot casting of aluminium foil parcel is positioned in the container made of iron and is that the fine sand of 0.25mm is buried fully with particle diameter, burying depth is 100mm, container is put into heat treatment furnace carry out homogenizing thermal treatment, and concrete system is for being heated to 400 ℃, be incubated 24 hours, the typical cast structure of alloy as shown in figure 10 after the thermal treatment;
(4) after the thermal treatment ingot casting is carried out turning, be processed as the alloy bar material of Φ 46mm;
(5) utilize reverse squeezing device, on 300 tons of oil presses, with the extrusion speed extruded alloy of 5.0m/min, obtain the extruded bar from magnesium alloy of Φ 8mm, extrusion ratio is 33, and the typical gold phase constitution of alloy extruded bars as shown in figure 11;
(6) the alloy extruded bars that obtains after will pushing carries out T6 thermal treatment, and concrete system carries out timeliness thermal treatment at 90 ℃ after being 380 ℃ * 1h solid solution shrend, and soaking time is 16 hours.
As shown in Figure 1 tension specimen is processed in its sampling, carries out room temperature tensile at the Instron8032 drawing machine, draw speed is 2mm/min, and the room temperature tensile mechanical property is as shown in table 5, and mean value is respectively: tensile strength R
m=188MPa, yield strength R
P0.2=106MPa, unit elongation A=12.0%.
Embodiment 6
(1) adopts the melting resistance furnace, MAGNESIUM METAL is heated to 720 ℃ of fusings, adopt No. five flux that the MAGNESIUM METAL melt is carried out purifying treatment, melt is warming up to 780 ℃ after stirring, add the Mg-MC master alloy that contains 1%MC and the Mg-Zr master alloy that contains 0.6% Zr, treats that melt temperature is down to 660 ℃, with the Li that adds lithium cover adding 5.5%, and at the following vertical stirring 5min of melt 2/3 degree of depth, being warming up to 720 ℃, melt left standstill 30 minutes;
(2) above fusion-casting process utilizes volume ratio CO
2: SF
6The protection of=20:1 gas mixture to prevent burning, is cast to metal liquid in the iron crucible that is preheating to 200 ℃, obtains ingot casting, and chemical analysis shows the Mg-5.45Li-0.98MC-0.61Zr that consists of of ingot casting;
(3) with the alloy cast ingot thick aluminium foil double wrapped of 0.1mm, and extrude the air in the slit between aluminium foil and the ingot casting, make the tight applying in surface of aluminium foil and ingot casting, the ingot casting of aluminium foil parcel is positioned in the container made of iron and is that the fine sand of 0.25mm is buried fully with particle diameter, burying depth is 100mm, container is put into heat treatment furnace carry out homogenizing thermal treatment, and concrete system is for being heated to 400 ℃, be incubated 48 hours, the typical cast structure of alloy as shown in figure 12 after the thermal treatment;
(4) after the thermal treatment ingot casting is carried out turning, be processed as the alloy bar material of Φ 46mm;
(5) utilize reverse squeezing device, on 300 tons of oil presses, with the extrusion speed extruded alloy of 5.0m/min, obtain the extruded bar from magnesium alloy of Φ 8mm, extrusion ratio is 33, and the typical gold phase constitution of alloy extruded bars as shown in figure 13;
(6) the alloy extruded bars that obtains after will pushing carries out T6 thermal treatment, and concrete system carries out timeliness thermal treatment at 90 ℃ after being 380 ℃ * 1h solid solution shrend, and soaking time is 16 hours.
As shown in Figure 1 tension specimen is processed in its sampling, carries out room temperature tensile at the Instron8032 drawing machine, draw speed is 2mm/min, and the room temperature tensile mechanical property is as shown in table 6, and mean value is respectively: tensile strength R
m=205MPa, yield strength R
P0.2=133MPa, unit elongation A=11.5%.
Claims (3)
1. a Mg-Li base wrought magnesium alloys that utilizes rare earth and Zr to strengthen is characterized in that adding rare earth element and Zr as the alloying constituent element take Mg-Li base magnesium alloy as base, its chemical ingredients is by mass percentage: Li1.5% ~ 5.5%, rare earth element 1%, Zr0.2 ~ 0.6%, surplus is Mg.
2. a kind of Mg-Li base wrought magnesium alloys that utilizes rare earth and Zr to strengthen according to claim 1, it is characterized in that: described rare earth element is Gd, La, Nd, Er, ML or MC, wherein ML is rich La mishmetal, and its chemical ingredients is La by mass percentage〉60%, all the other are Ce and Y; MC is rich Ce mishmetal, and its chemical ingredients is Ce by mass percentage〉50%, all the other are La, Nd and Pr.
3. a kind of preparation method who utilizes the Mg-Li base wrought magnesium alloys that rare earth and Zr strengthen as claimed in claim 1 is characterized in that may further comprise the steps:
(1) adopts the melting resistance furnace, MAGNESIUM METAL is heated to 710 ℃ ~ 730 ℃ fusings, adopts No. five flux that the MAGNESIUM METAL melt is carried out purifying treatment, melt is warming up to 780 ℃ after stirring, add and contain 1% rare earth element master alloy, contain the Mg-Zr master alloy of 0.2 ~ 0.6%Zr; Treat that melt temperature is down to 660 ℃ ~ 670 ℃, add 1.5% ~ 5.5% Li with adding the lithium cover, and at the following vertical stirring 3 ~ 5min of melt 2/3 degree of depth, be warming up to 720 ℃ that melt leaves standstill 30min; This fusion-casting process utilizes volume ratio CO
2: SF
6=20:1's is mixed gas protected, to prevent burning;
(2) metal melt is poured in the iron crucible that is preheating to 200 ℃, obtains ingot casting;
(3) with the alloy cast ingot thick aluminium foil double wrapped of 0.1mm, and extrude the air in the slit between aluminium foil and the ingot casting, make the tight applying in surface of aluminium foil and ingot casting, the ingot casting of aluminium foil parcel is positioned in the container made of iron and is that the fine sand of 0.25mm is buried ingot casting fully with particle diameter, burying depth is 100mm, container is put into heat treatment furnace carry out homogenizing thermal treatment, concrete system is for being heated to 300 ~ 400 ℃, insulation 12 ~ 48h;
(4) ingot casting after the thermal treatment is carried out turning, remove the surface oxidation part, be processed as the alloy bar material of Φ 46mm;
(5) utilize reverse squeezing device, on 300 tons of oil presses, with the extrusion speed extruded alloy of 5.0m/min, extrusion ratio is 33 or 15, obtains respectively the extruded bar from magnesium alloy of Φ 8mm or Φ 12mm;
(6) the alloy extruded bars that obtains after will pushing carries out T6 thermal treatment, and concrete system carries out timeliness thermal treatment at 90 ℃ after being 380 ℃ * 1h solid solution shrend, and soaking time is 8 ~ 16h.
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| CN106676351A (en) * | 2016-11-29 | 2017-05-17 | 哈尔滨工程大学 | Erbium strengthened magnesium-lithium alloy and preparation method thereof |
| CN107964602A (en) * | 2016-10-19 | 2018-04-27 | 中国科学院金属研究所 | Improve the effective ways of high intensity Mg-Gd-Y-Nd-Zr magnesium alloy plastic forming abilities |
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| CN104131247A (en) * | 2014-08-12 | 2014-11-05 | 中国科学院金属研究所 | Heat treatment process for inhibiting plastic instability of quasi-crystal reinforced magnesium lithium alloys |
| CN104131247B (en) * | 2014-08-12 | 2016-03-02 | 中国科学院金属研究所 | A kind of thermal treatment process suppressing accurate brilliant strengthen magnesium lithium alloy plastic instability |
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| CN106676351A (en) * | 2016-11-29 | 2017-05-17 | 哈尔滨工程大学 | Erbium strengthened magnesium-lithium alloy and preparation method thereof |
| CN106676351B (en) * | 2016-11-29 | 2018-10-26 | 哈尔滨工程大学 | A kind of erbium strengthens magnesium lithium alloy and preparation method thereof |
| CN110438379A (en) * | 2019-08-29 | 2019-11-12 | 东北大学 | A kind of magnesium/aluminum matrix composite preparation method containing lithium |
| CN111020325A (en) * | 2019-12-18 | 2020-04-17 | 佛山科学技术学院 | Corrosion-resistant magnesium-lithium alloy |
| CN115233061A (en) * | 2022-06-30 | 2022-10-25 | 上海航天精密机械研究所 | Ultrahigh-plasticity rare earth wrought magnesium alloy plate and preparation method thereof |
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