CN102828094B - Deforming magnesium alloy and preparation method thereof - Google Patents

Deforming magnesium alloy and preparation method thereof Download PDF

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CN102828094B
CN102828094B CN201210344403.9A CN201210344403A CN102828094B CN 102828094 B CN102828094 B CN 102828094B CN 201210344403 A CN201210344403 A CN 201210344403A CN 102828094 B CN102828094 B CN 102828094B
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magnesium
alloy
ingot
gadolinium
yttrium
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CN201210344403.9A
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CN102828094A (en
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孟健
于子健
邱鑫
孙伟
张德平
张洪杰
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中国科学院长春应用化学研究所
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Abstract

The invention provides a deforming magnesium alloy and a preparation method thereof. The deforming magnesium alloy comprises the following components in percentage by mass: 0.1-10% of neodymium, 10-12% of gadolinium, 3-5% of yttrium, 0.5-2% of zinc, 0.3-0.8% of zirconium, and the balance of magnesium and inevitable impurities. Compared with WE54 in the prior art, the invention is characterized in that rare-earth elements neodymium, gadolinium and yttrium are added into the Mg-Zn-Zr magnesium alloy. Firstly, after adding zinc, abundant strip Mg12YZn precipitated phases are formed at the alloy grain boundary to prevent grain boundary migration at high temperature and enhance the high-temperature stability of the alloy, and the precipitated phases are uniformly arranged in the extrusion direction to prevent basal dislocation migration and enhance the mechanical properties of the alloy; and secondly, the three rare-earth elements gadolinium, yttrium and neodymium are added, so the interactions among the rare-earth elements can be utilized to lower the solid solubility of the gadolinium, yttrium and neodymium in the magnesium base, thereby promoting the formation of the precipitated phases and enhancing the mechanical properties of the alloy.

Description

A kind of wrought magnesium alloys and preparation method thereof
Technical field
The invention belongs to metallic substance technical field, relate in particular to a kind of wrought magnesium alloys and preparation method thereof.
Background technology
Magnesium alloy is the structure metallic substance that weight is the lightest, and density is 1.75 ~ 1.90g/cm 3, be only 2/3 of aluminium alloy, 1/4 of iron and steel.Compare with other structural metallic materialss, magnesium alloy has high specific strength, specific rigidity, damping property, electromagnetic wave shielding and capability of resistance to radiation are strong, easily machining, easy recovery etc. are a little a series of, at automobile, electronic apparatus, communication, aerospace and national defense and military industrial circle, having and important using value and wide application prospect, is the 3rd metalloid structured material growing up after iron and steel and aluminium alloy.According to the difference of processing mode, magnesium alloy materials is mainly divided into cast magnesium alloys and the large class of wrought magnesium alloys two.Wrought magnesium alloys refers to the magnesium alloy of the plastic molding method processing such as available extruding, rolling, forging and impact, it can pass through the control of material structure and the application of thermal treatment process, the intensity that acquisition is higher than casting magnesium alloy material, better ductility, more diversified mechanical property, thereby the needs of satisfied more structural parts.
Wrought magnesium alloys mainly contains the alloy systems such as Mg-Al system, Mg-Zn system, Mg-RE system, Mg-Zr system, and wherein the most common alloy system is that Mg-Al-Zn system and Mg-Zn-Zr are associated gold.Mg-Al-Zn series magnesium alloy is that current room temperature is most widely used alloy system, and its principal feature is that intensity is high, can heat-treat strengthening, and has good castability, but Mg in this series magnesium alloy 17al 22under hot conditions, grow up rapidly, thereby cause alloy mechanical performance to decline, cannot use as thermal structure part.Mg-Zn-Zr is associated golden grain boundaries a large amount of block eutectic phase Mg that distributing 7zn 3, MgZn etc., the fusing point of eutectic phase is all lower than 340 ℃, cannot pinning crystal boundary after it is softening, hinder dislocation motion, thereby it is poor to cause Mg-Zn-Zr to be associated golden high-temperature behavior.
Rare earth is widely used as the alloy element that improves wrought magnesium alloys resistance toheat, most of rare earth element has larger solid solubility limit in magnesium, and decline with temperature, solid solubility sharply reduces, can obtain larger degree of supersaturation, thus in ag(e)ing process subsequently diffusion-precipitation, dystectic rare earth compound phase; Rare earth element can also crystal grain thinning, improve room temperature strength, and be distributed in intracrystalline and crystal boundary disperse, high-melting-point rare earth compound, still can the dislocation of pinning intracrystalline and Grain Boundary Sliding when high temperature, thus improved the hot strength of magnesium alloy.
Wherein, WE54 is a kind of typical magnesium-rare earth containing neodymium, its composition is Mg-5.1%Y-3.2%RE (1.5% ~ 2%Nd)-0.5%Zr, be the magnesium alloy of current commercialization better performances, heat resisting temperature can reach 300 ℃, and after heat treatment, corrosion resisting property is also due to other High Temperature Magnesium Alloys, but resistance toheat is stable not, and during high temperature, strength degradation is more, and its mechanical property also has much room for improvement.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of wrought magnesium alloys and preparation method thereof, and this wrought magnesium alloys has good high-temperature stability and higher mechanical property.
The invention provides a kind of wrought magnesium alloys, comprising: the neodymium of 0.1wt% ~ 10wt%, the gadolinium of 10wt%12wt%, the yttrium of 3wt% ~ 5wt%, the zinc of 0.5wt% ~ 2wt%, the zirconium of 0.3wt% ~ 0.8wt%, the magnesium of surplus and inevitably impurity.
The preparation method who the invention provides a kind of wrought magnesium alloys, comprises the following steps:
A) molten alloy is carried out in magnesium ingot, zinc ingot metal, gadolinium source, neodymium source, He Gao source, yttrium source, after refining, obtain magnesium melt, described magnesium melt comprises the neodymium of 0.1wt%10wt%, the gadolinium of 10wt% ~ 12wt%, the yttrium of 3wt% ~ 5wt%, the zinc of 0.5wt% ~ 2wt%, the zirconium of 0.3wt% ~ 0.8wt%, the magnesium of surplus and inevitably impurity;
B) by described magnesium melt casting, after extruding, obtain wrought magnesium alloys.
Preferably, described gadolinium source is gadolinium ingot and/or magnesium gadolinium intermediate alloy ingot.
Preferably, described neodymium source is neodymium ingot and/or magnesium neodymium intermediate alloy ingot.
Preferably, described yttrium source is yttrium ingot and/or magnesium yttrium intermediate alloy ingot.
Preferably, described zirconium source is zirconium ingot and/or Mg-Zr intermediate alloy ingot.
Preferably, described step B is specially:
By described magnesium melt casting, solution treatment, extruding, carries out, after ageing treatment, obtaining wrought magnesium alloys.
Preferably, described steps A is specially:
Under protective atmosphere, magnesium ingot, zinc ingot metal and insulating covering agent are added to smelting furnace, be warming up to 730 ℃ ~ 750 ℃, add He Nv source, gadolinium source, continue to be warming up to 760 ℃ ~ 780 ℃, obtain magnesium melt after adding yttrium source, zirconium source and refining agent refining; Described magnesium melt comprises the neodymium of 0.1wt% ~ 10wt%, the gadolinium of 10wt% ~ 12wt%, the yttrium of 3wt% ~ 5wt%, the zinc of 0.5wt% ~ 2wt%, the zirconium of 0.3wt% ~ 0.8wt%, the magnesium of surplus and inevitably impurity.
Preferably, the MgCl that described insulating covering agent comprises 30 ~ 40wt% 2, the KCl/NaCl of 15 ~ 25wt%, the CaF/NaF of 15 ~ 25wt% and the BaCl of surplus 2.
Preferably, the KCl/NaCl that described refining agent comprises 50 ~ 60wt%, the BaCl of 15 ~ 20wt% 2, the CaCl of 20 ~ 30wt% 2mgCO with surplus 3/ Na 2cO 3.
The invention provides a kind of wrought magnesium alloys and preparation method thereof, this wrought magnesium alloys comprises the neodymium of 0.1wt% ~ 10wt%, the gadolinium of 10wt% ~ 12wt%, the yttrium of 3wt% ~ 5wt%, the zinc of 0.5wt% ~ 2wt%, the zirconium of 0.3wt% ~ 0.8wt%, the magnesium of surplus and inevitably impurity.WE54 compares with prior art, and the present invention adds rear earth element nd, gadolinium and yttrium in Mg-Zn-Zr ternary magnesium alloy.First, add after zinc grain boundaries in alloy to form the Mg of a large amount of strips 12yZn precipitated phase, can stop the slippage of crystal boundary under hot conditions, has improved the high-temperature stability of alloy, and this precipitated phase is along the unified arrangement of the direction of extrusion, can hinder basal plane dislocation slippage, has improved the mechanical property of alloy; Secondly, add gadolinium, yttrium and three kinds of rare earth elements of neodymium, can utilize the interaction between rare earth element to reduce gadolinium, yttrium and the solid solubility of neodymium in magnesium matrix, promoted the formation of precipitated phase, improved the mechanical property of alloy.
Experimental result shows, the tensile strength of wrought magnesium alloys room temperature prepared by the present invention (25 ℃) is greater than 420MPa, yield strength is greater than 320MPa, tensile strength in the time of 200 ℃ is greater than 380MPa, yield strength is greater than 300MPa, and the tensile strength in the time of 250 ℃ is greater than 350MPa, and yield strength is greater than 290MPa, tensile strength in the time of 300 ℃ is greater than 225MPa, and yield strength is greater than 190MPa.
Accompanying drawing explanation
Fig. 1 is the As-extruded metallographic structure figure of the wrought magnesium alloys of the embodiment of the present invention 2 preparations;
Fig. 2 is the transmission electron microscope micro-organization chart of the wrought magnesium alloys of the embodiment of the present invention 2 preparations.
Embodiment
The invention provides a kind of wrought magnesium alloys, comprise the neodymium of 0.1wt% ~ 10wt%, the gadolinium of 10wt% ~ 12wt%, the yttrium of 3wt% ~ 5wt%, the zinc of 0.5wt% ~ 2wt%, the zirconium of 0.3wt% ~ 0.8wt%, the magnesium of surplus and inevitably impurity.
Wherein, the content of described neodymium is preferably 0.5wt% ~ 8wt%, 0.5wt% ~ 6wt% more preferably, then be preferably 0.5wt% ~ 4wt%; The content of described gadolinium is preferably 10wt% ~ 11.5wt%; The content of described yttrium is preferably 3.5wt% ~ 5wt%, more preferably 3.5wt% ~ 4.5wt%; The content of described zinc is preferably 0.5wt% ~ 1.5wt%, more preferably 0.5wt% ~ 1wt%; The content of described zirconium is preferably 0.4wt% ~ 0.8wt%, 0.4wt% ~ 0.6wt% more preferably, then be preferably 0.5wt% ~ 0.6wt%; The content of described impurity is less than 0.02%, and described impurity is inevitable impurity well known to those skilled in the art, generally includes elemental silicon, iron, copper and mickel.
The present invention also provides a kind of preparation method of wrought magnesium alloys, comprise the following steps: A) molten alloy is carried out in magnesium ingot, zinc ingot metal, gadolinium source, neodymium source, He Gao source, yttrium source, after refining, obtain magnesium melt, described magnesium melt comprises the neodymium of 0.1wt% ~ 10wt%, the gadolinium of 10wt% ~ 12wt%, the yttrium of 3wt% ~ 5wt%, the zinc of 0.5wt% ~ 2wt%, the zirconium of 0.3wt% ~ 0.8wt%, the magnesium of surplus and inevitably impurity, the content of described impurity is less than 0.02%; B) by described magnesium melt casting, after extruding, obtain wrought magnesium alloys.
In order to clearly demonstrate the present invention, below respectively the experimentation of steps A and step B is described in detail.
According to steps A of the present invention, be specially: under protective atmosphere; magnesium ingot, zinc ingot metal and insulating covering agent are added to smelting furnace; be warming up to 730 ℃ ~ 750 ℃; be preferably 730 ℃ ~ 740 ℃; add He Nv source, gadolinium source; continue to be warming up to 760 ℃ ~ 780 ℃; be preferably 770 ℃ ~ 780 ℃; add He Gao source, yttrium source, be cooled to 730 ℃ ~ 750 ℃, be preferably 730 ℃ ~ 740 ℃; add refining agent; after refining, obtain magnesium melt, described magnesium melt comprises various elements and the content described in above-mentioned magnesium alloy, does not repeat them here.
According to this order of addition(of ingredients), can reduce interaction between different elements and form the possibility of compound, thereby guarantee the accuracy of alloying constituent, improved the quality of alloy.
Described protective atmosphere is protective atmosphere well known to those skilled in the art, is preferably volume fraction and is the mixed gas of the sulfur hexafluoride of 99% carbonic acid gas and 1%.Sulfur hexafluoride has good protection effect to magnesium alloy, can form the more stable MgF with good protection effect of a thick-layer at magnesium bath surface 2compound protective membrane.
Wherein, described gadolinium source is gadolinium ingot and/or magnesium gadolinium intermediate alloy ingot, is preferably the magnesium gadolinium intermediate alloy ingot containing 20wt% magnesium; Described neodymium source is neodymium ingot and/or magnesium neodymium intermediate alloy ingot, is preferably the magnesium neodymium intermediate alloy ingot containing 20wt% magnesium; Described yttrium source is yttrium ingot and/or magnesium yttrium intermediate alloy ingot, is preferably the magnesium yttrium intermediate alloy ingot containing 20wt% magnesium; Described zirconium source is zirconium ingot and/or Mg-Zr intermediate alloy ingot, is preferably the Mg-Zr intermediate alloy ingot containing 30wt% magnesium.
According to the present invention, described magnesium ingot, zinc ingot metal and various intermediate alloy ingot are preferably processed through over-segmentation, scale removal, oil removing and drying and other steps.Described magnesium ingot is preferably containing pure magnesium ingot more than magnesium 99.9wt%, and described zinc ingot metal is preferably containing pure zinc ingot more than zinc 99.9wt%.
Described insulating covering agent is insulating covering agent well known to those skilled in the art, is preferably the MgCl that comprises 30 ~ 40wt% 2, being preferably 35 ~ 40wt%, the KCl of 15 ~ 25wt% or NaCl, be preferably 18 ~ 22wt%, and the CaF of 15 ~ 25wt% or NaF are preferably the BaCl of 18 ~ 22wt% and surplus 2.The quality of described insulating covering agent is 2% ~ 5% of alloy raw material gross weight, is preferably 2% ~ 3%, and its Main Function is that protection melt is not oxidized,, because inflammable its of magnesium also can be used as fire-fighting medium, uses meanwhile.
Described refining agent is refining agent well known to those skilled in the art, preferably comprises KCl or the NaCl of 50 ~ 60wt%, is preferably 52 ~ 56wt%, the BaCl of 15 ~ 20wt% 2, be preferably 16 ~ 19wt%, the CaCl of 20 ~ 30wt% 2, be preferably the MgCO of 22 ~ 26wt% and surplus 3or Na 2cO 3.The quality of described refining agent is 2% ~ 5% of alloy raw material gross weight, is preferably 2% ~ 3%, and its Main Function is to carry heavy alloyed Melting Quality in the present invention.
In fusion process, alloying element adopts the mode of master alloy to add, and adds insulating covering agent and refining agent simultaneously, can fall low-alloyed smelting temperature, and can remove be mingled with, gas etc., the purity of raising melt.
According to the present invention, in described steps A, refining is specially: add after refining agent, stir 10 ~ 15min, be preferably 12 ~ 14min, be blown into argon gas 10 ~ 20min, be preferably 15 ~ 18min, be warming up to 750 ℃ ~ 780 ℃, be preferably 755 ℃ ~ 770 ℃, insulation 20 ~ 30min, is preferably 25 ~ 30min, be cooled to 730 ℃ ~ 750 ℃, be preferably 730 ℃ ~ 740 ℃, insulation 10 ~ 20min, is preferably 15 ~ 18min.Pass into argon gas and can get rid of other obnoxious flavoures in melt as chlorine and oxygen etc., and also can reach the effect of stirring melt and make in melt solute distribution more even, avoid the generation of the casting flaws such as segregation.
Described step B is specially: by the processing of skimming of described magnesium melt, at 690 ℃ ~ 730 ℃, be preferably 710 ℃ ~ 730 ℃, by being preheated in advance the water die casting of 200 ℃ ~ 300 ℃, become pole, be preferably 200 ℃ ~ 250 ℃, after turning, solution treatment, extrusion molding, carry out, after ageing treatment, obtaining wrought magnesium alloys.
Water mould can accelerate ingot casting rate of cooling, and crystal grain thinning is conducive to large-scale industrial production.
The temperature of described solution treatment is 500 ℃ ~ 550 ℃, is preferably 520 ℃ ~ 540 ℃, and the time is 2 ~ 32h, is preferably 20 ~ 32h.
The condition of described extrusion molding is 380 ℃ ~ 480 ℃ and is preferably 400 ℃ ~ 460 ℃, after preheating 30 ~ 120min, pushes, and is preferably 60 ~ 100min.
Before extrusion molding, carry out solution treatment preheating, be conducive to carrying out smoothly of extrusion process, avoid the generation of " squeezing motionless " phenomenon, also can reduce extrusion temperature simultaneously.
Add after zinc grain boundaries in alloy to form the Mg of a large amount of strips 12yZn precipitated phase, can stop the slippage of crystal boundary under hot conditions, has improved the high-temperature stability of alloy; And this precipitated phase is arranged along the direction of extrusion is unified, and the crystalline structure of wrought magnesium alloys is hexagonal structure, and the main slippage of room temperature is (0001) basal slip system, so the Mg of ordered arrangement 12yZn precipitated phase can play strengthening effect in the direction of extrusion, hinders basal plane dislocation slippage, has improved the mechanical property of alloy.
Described ageing treatment is preferably artificial aging, and described artificially aged aging temp is 185 ℃ ~ 250 ℃, is preferably 200 ℃ ~ 240 ℃, and aging time is 2 ~ 100h, is preferably 60 ~ 80h.
After artificial aging, can produce the Mg-RE phase of a large amount of equally distributed nano-scales in magnesium matrix, it can hinder basal plane dislocation slippage, reduces the ability of alloy deformation, puies forward heavy alloyed mechanical property.The present invention adopts multiple rare-earth element gadolinium, yttrium and neodymium as adding rare earth element, can utilize the interaction between rare earth element, reduce the solid solubility of these three kinds of elements in magnesium matrix, improve age hardening feature, during peak value, the hardness of aging samples reaches 130Hv, and can promote the formation of Mg-RE precipitated phase, put forward the mechanical property of heavy alloyed room temperature and high temperature.
In order to further illustrate the present invention, below in conjunction with embodiment, a kind of wrought magnesium alloys provided by the invention and preparation method thereof is described in detail.
In following examples, reagent used is commercially available.
Embodiment 1
1.1 by pure Mg ingot, pure Zn ingot, 20%Mg-Gd master alloy, 20%Mg-Y master alloy, 20%Mg-Nd master alloy with 30%Mg-Zr master alloy is cut apart, scale removal, oil removing and dry, press constituent content Gd 10wt%, Y 4wt%, Zn 1wt%, Nd 0.5wt%, Zr 0.4wt%, the proportioning feeding that surplus is Mg.Preparation insulating covering agent: by the MgCl of 40wt% 2, the KCl of 20wt%, the CaF of 20wt% and the BaCl of 20wt% 2be mixed to get insulating covering agent; Preparation refining agent: by the KCl of 54wt%, the BaCl of 18wt% 2, the Cacl of 24wt% 2mgCO with 4wt% 3be mixed to get refining agent.
1.2 under the condition of 99% carbonic acid gas and the protection of 1% sulfur hexafluoride gas mixture, by 2wt% alloy raw material 1.1 in preparation insulating covering agent, the pure Mg ingot and the pure Zn ingot that in 1.1, take add in smelting furnace, be warming up to 750 ℃, add the Mg-Gd master alloy and the Mg-Nd master alloy that in 1.1, take, stir 2min, be warming up to 780 ℃, add Mg-Y master alloy and Mg-Zr master alloy, stir 2min, be cooled to 750 ℃, add 2wt% alloy raw material 1.1 in preparation refining agent, stir after 12min, be blown into argon gas refining 15min, be warming up to 750 ℃, be incubated standing 25min, be cooled to 730 ℃ of standing 15min of insulation, after magnesium melt is skimmed, at 730 ℃, by being preheated to the water die casting of 200 ℃, become pole, 535 ℃ of solution treatment 24h after turning, extrusion molding after 420 ℃ of preheating 60min, extrusion temperature is 420 ℃, extrusion ratio is 13, extruding rate is constant.Alloy after extruding is carried out to artificial aging processing, and aging temp is 200 ℃, and aging time is 72h, obtains wrought magnesium alloys, comprise Gd 10wt%, Y 4wt%, Zn 1wt%, Nd 0.5wt%, Zr 0.4wt%, the total amount of impurity element S i, Fe, Cu and Ni is less than 0.02%, and surplus is Mg.
The wrought magnesium alloys obtaining in 1.2 is carried out to Mechanics Performance Testing, obtain its test result, in Table 1.
The room temperature of wrought magnesium alloys and mechanical behavior under high temperature in table 1 embodiment 1
Embodiment 2
2.1 by pure Mg ingot, pure Zn ingot, 20%Mg-Gd master alloy, 20%Mg-Y master alloy, 20%Mg-Nd master alloy with 30%Mg-Zr master alloy is cut apart, scale removal, oil removing and dry, press constituent content Gd 11wt%, Y 5wt%, Zn 1.5wt%, Nd 1wt%, Zr 0.8wt%, the proportioning feeding that surplus is Mg.Preparation insulating covering agent: by the MgCl of 40wt% 2, the KCl of 20wt%, the CaF of 20wt% and the BaCl of 20wt% 2be mixed to get insulating covering agent; Preparation refining agent: by the KCl of 54wt%, the BaCl of 18wt% 2, the Cacl of 24wt% 2mgCO with 4wt% 3be mixed to get refining agent.
2.2 under the condition of 99% carbonic acid gas and the protection of 1% sulfur hexafluoride gas mixture, by 2wt% alloy raw material 2.1 in preparation insulating covering agent, the pure Mg ingot and the pure Zn ingot that in 2.1, take add in smelting furnace, be warming up to 730 ℃, add the Mg-Gd master alloy and the Mg-Nd master alloy that in 2.1, take, stir 2min, be warming up to 780 ℃, add Mg-Y master alloy and Mg-Zr master alloy, stir 2min, be cooled to 730 ℃, add 2wt% alloy raw material 2.1 in preparation refining agent, stir after 12min, be blown into argon gas refining 15min, be warming up to 780 ℃, be incubated standing 25min, be cooled to 750 ℃ of standing 15min of insulation, after magnesium melt is skimmed, at 720 ℃, by being preheated to the water die casting of 200 ℃, become pole, 535 ℃ of solution treatment 24h after turning, extrusion molding after 410 ℃ of preheating 60min, extrusion temperature is 410 ℃, extrusion ratio is 13, extruding rate is constant.Alloy after extruding is carried out to artificial aging processing, and aging temp is 200 ℃, and aging time is 72h, obtains wrought magnesium alloys, comprise Gd 11wt%, Y 5wt%, Zn 1.5wt%, Nd 1wt%, Zr 0.8wt%, the total amount of impurity element S i, Fe, Cu and Ni is less than 0.02%, and surplus is Mg.
The wrought magnesium alloys obtaining in 2.2 is carried out to Mechanics Performance Testing, obtain its test result, in Table 2.
The room temperature of wrought magnesium alloys and mechanical behavior under high temperature in table 2 embodiment 2
Utilize surface sweeping Electronic Speculum to analyze the wrought magnesium alloys obtaining in 2.2, obtain its As-extruded metallographic structure figure, as shown in Figure 1.The Mg that in figure, A is strip 12yZn precipitated phase, B is Mg-RE precipitated phase (Mg 5gd).
Utilize transmission electron microscope to analyze the wrought magnesium alloys obtaining in 2.2, obtain its transmission electron microscope micro-organization chart, as shown in Figure 2.The Mg that in figure, A is strip 12yZn precipitated phase, B is Mg-RE precipitated phase (Mg 5gd).
Embodiment 3
3.1 by pure Mg ingot, pure Zn ingot, 20%Mg-Gd master alloy, 20%Mg-Y master alloy, 20%Mg-Nd master alloy with 30%Mg-Zr master alloy is cut apart, scale removal, oil removing and dry, press constituent content Gd 10wt%, Y 4wt%, Zn 0.5wt%, Nd 2wt%, Zr 0.5wt%, the proportioning feeding that surplus is Mg.Preparation insulating covering agent: by the MgCl of 40wt% 2, the KCl of 20wt%, the CaF of 20wt% and the BaCl of 20wt% 2be mixed to get insulating covering agent; Preparation refining agent: by the KCl of 54wt%, the BaCl of 18wt% 2, the Cacl of 24wt% 2mgCO with 4wt% 3be mixed to get refining agent.
3.2 under the condition of 99% carbonic acid gas and the protection of 1% sulfur hexafluoride gas mixture, by 2wt% alloy raw material 3.1 in preparation insulating covering agent, the pure Mg ingot and the pure Zn ingot that in 3.1, take add in smelting furnace, be warming up to 730 ℃, add the Mg-Gd master alloy and the Mg-Nd master alloy that in 3.1, take, stir 2min, be warming up to 780 ℃, add Mg-Y master alloy and Mg-Zr master alloy, stir 2min, be cooled to 730 ℃, add 2wt% alloy raw material 3.1 in preparation refining agent, stir after 12min, be blown into argon gas refining 15min, be warming up to 750 ℃, be incubated standing 25min, be cooled to 730 ℃ of standing 15min of insulation, after magnesium melt is skimmed, at 690 ℃, by being preheated to the water die casting of 300 ℃, become pole, 550 ℃ of solution treatment 24h after turning, extrusion molding after 450 ℃ of preheating 60min, extrusion temperature is 450 ℃, extrusion ratio is 33, extruding rate is constant.Alloy after extruding is carried out to artificial aging processing, and aging temp is 200 ℃, and aging time is 72h, obtains wrought magnesium alloys, comprise Gd 10wt%, Y 4wt%, Zn 0.5wt%, Nd 2wt%, Zr 0.5wt%, the total amount of impurity element S i, Fe, Cu and Ni is less than 0.02%, and surplus is Mg.
The wrought magnesium alloys obtaining in 3.2 is carried out to Mechanics Performance Testing, obtain its test result, in Table 3.
The room temperature of wrought magnesium alloys and mechanical behavior under high temperature in table 3 embodiment 3
Embodiment 4
4.1 by pure Mg ingot, pure Zn ingot, 20%Mg-Gd master alloy, 20%Mg-Y master alloy, 20%Mg-Nd master alloy with 30%Mg-Zr master alloy is cut apart, scale removal, oil removing and dry, press constituent content Gd 12wt%, Y 3wt%, Zn 2wt%, Nd 3wt%, Zr 0.6wt%, the proportioning feeding that surplus is Mg.Preparation insulating covering agent: by the MgCl of 40wt% 2, the KCl of 20wt%, the CaF of 20wt% and the BaCl of 20wt% 2be mixed to get insulating covering agent; Preparation refining agent: by the KCl of 54wt%, the BaCl of 18wt% 2, the Cacl of 24wt% 2mgCO with 4wt% 3be mixed to get refining agent.
4.2 under the condition of 99% carbonic acid gas and the protection of 1% sulfur hexafluoride gas mixture, by 2wt% alloy raw material 4.1 in preparation insulating covering agent, the pure Mg ingot and the pure Zn ingot that in 4.1, take add in smelting furnace, be warming up to 730 ℃, add the Mg-Gd master alloy and the Mg-Nd master alloy that in 4.1, take, stir 2min, be warming up to 780 ℃, add Mg-Y master alloy and Mg-Zr master alloy, stir 2min, be cooled to 730 ℃, add 2wt% alloy raw material 4.1 in preparation refining agent, stir after 12min, be blown into argon gas refining 15min, be warming up to 780 ℃, be incubated standing 25min, be cooled to 730 ℃ of standing 15min of insulation, after magnesium melt is skimmed, at 690 ℃, by being preheated to the water die casting of 200 ℃, become pole, 500 ℃ of solution treatment 24h after turning, extrusion molding after 430 ℃ of preheating 60min, extrusion temperature is 430 ℃, extrusion ratio is 33, extruding rate is constant.Alloy after extruding is carried out to artificial aging processing, and aging temp is 200 ℃, and aging time is 72h, obtains wrought magnesium alloys, comprise Gd 12wt%, Y 3wt%, Zn 2wt%, Nd 3wt%, Zr 0.6wt%, the total amount of impurity element S i, Fe, Cu and Ni is less than 0.02%, and surplus is Mg.
The wrought magnesium alloys obtaining in 4.2 is carried out to Mechanics Performance Testing, obtain its test result, in Table 4.
The room temperature of wrought magnesium alloys and mechanical behavior under high temperature in table 4 embodiment 4
Comparative example
The mechanical property of the WE54 of table 5 Britain Elektron company
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (10)

1. a wrought magnesium alloys, is characterized in that, comprising: the neodymium of 0.1wt% ~ 10wt%, the gadolinium of 10wt% ~ 12wt%, the yttrium of 3wt% ~ 5wt%, the zinc of 0.5wt% ~ 2wt%, the zirconium of 0.3wt% ~ 0.8wt%, the magnesium of surplus and inevitably impurity.
2. a preparation method for wrought magnesium alloys, is characterized in that, comprises the following steps:
A) molten alloy is carried out in magnesium ingot, zinc ingot metal, gadolinium source, neodymium source, He Gao source, yttrium source, after refining, obtain magnesium melt, described magnesium melt comprises the neodymium of 0.1wt% ~ 10wt%, the gadolinium of 10wt% ~ 12wt%, the yttrium of 3wt% ~ 5wt%, the zinc of 0.5wt% ~ 2wt%, the zirconium of 0.3wt% ~ 0.8wt%, the magnesium of surplus and inevitably impurity;
B) by described magnesium melt casting, after extruding, obtain wrought magnesium alloys.
3. preparation method according to claim 2, is characterized in that, described gadolinium source is gadolinium ingot and/or magnesium gadolinium intermediate alloy ingot.
4. preparation method according to claim 2, is characterized in that, described neodymium source is neodymium ingot and/or magnesium neodymium intermediate alloy ingot.
5. preparation method according to claim 2, is characterized in that, described yttrium source is yttrium ingot and/or magnesium yttrium intermediate alloy ingot.
6. preparation method according to claim 2, is characterized in that, described zirconium source is zirconium ingot and/or Mg-Zr intermediate alloy ingot.
7. preparation method according to claim 2, is characterized in that, described step B is specially:
By described magnesium melt casting, solution treatment, extruding, carries out, after ageing treatment, obtaining wrought magnesium alloys.
8. preparation method according to claim 2, is characterized in that, described steps A is specially:
Under protective atmosphere, magnesium ingot, zinc ingot metal and insulating covering agent are added to smelting furnace, be warming up to 730 ℃ ~ 750 ℃, add He Nv source, gadolinium source, continue to be warming up to 760 ℃ ~ 780 ℃, obtain magnesium melt after adding yttrium source, zirconium source and refining agent refining; Described magnesium melt comprises the neodymium of 0.1wt% ~ 10wt%, the gadolinium of 10wt% ~ 12wt%, the yttrium of 3wt% ~ 5wt%, the zinc of 0.5wt% ~ 2wt%, the zirconium of 0.3wt% ~ 0.8wt%, the magnesium of surplus and inevitably impurity.
9. preparation method according to claim 8, is characterized in that, the MgCl that described insulating covering agent comprises 30 ~ 40wt% 2, the KCl/NaCl of 15 ~ 25wt%, the CaF/NaF of 15 ~ 25wt% and the BaCl of surplus 2.
10. preparation method according to claim 8, is characterized in that, the KCl/NaCl that described refining agent comprises 50 ~ 60wt%, the BaCl of 15 ~ 20wt% 2, the CaCl of 20 ~ 30wt% 2mgCO with surplus 3/ Na 2cO 3.
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