CN1962914A - Cast magnesium alloy containing rare-earth and preparation method thereof - Google Patents
Cast magnesium alloy containing rare-earth and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a cast magnesium alloy with rare earth and preparing method, which is characterized by the following: allocating component with Gd at 6-15%, Sm at 2-6% and Zr at 0.35-0.8%; setting the total quantity of Si, Fe, Cu and Ni less than 0.02% and Mg; adding Gd, Sm and Zr in the magnesium flux at middle alloy pattern of Mg-Gd, Mg-Sm and Mg-Zr in the fusing course; quenching the fused magnesium alloy at 500-540 Deg C for 4-10h to do solid dissolving disposal; proceeding ageing effect disposal to improve strength at 175-250 Deg C for 4-50h; using Gd and Sm to replace Y and Nd in the WE series; improving indoor strength and instantaneous high-temperature strength.
Description
Technical field
The present invention relates to a kind of cast magnesium alloy containing rare-earth and preparation method thereof, be specifically related to a kind of by adding alloying element (Gd, Sm, Zr) and change cast magnesium alloys that melting, process of thermal treatment condition obtain and preparation method thereof, this type of magnesium alloy that makes has mechanical propertys such as the room temperature strength more superior than traditional commerce magnesium alloy, TRANSIENT HIGH TEMPERATURE intensity.Belong to class of metal materials and field of metallurgy.
Background technology
The not good serious paces that hinder magnesium alloy material such as substitution of Al alloy in aerospace, military project and other industry of undercapacity and thermotolerance.Rare earth element, especially Y, Nd etc., aspect effects such as magnesium alloy strength, thermotolerance are remarkable improving.For example: traditional commercial heat resistance magnesium alloy WE43 and WE54.According to the difference of rare earth element configuration of extra-nuclear electron, rare earth element can be divided into two groups: Ce group and Y group.Nd, Sm belong to the Ce group together, and Y, Gd belong to the Y group together.Ce group element solid solubility in magnesium matrix is less; Y group element solid solubility in magnesium matrix is very big.At eutectic temperature, the limit solid solubility of Gd in magnesium is 23.3wt.% (4.48at.%), greater than the 12.0wt.% (3.59at.%) of Y; The limit solid solubility of Sm in magnesium is 5.8wt.% (0.99at.%), greater than the 3.6wt.% (0.63at%) of Nd.And Gd, the Sm solid solubility in magnesium all significantly descends with the reduction of temperature, this means that Mg-Gd, Mg-Sm binary alloy are that the typical case can may produce solution strengthening and the ageing strengthening effect better than Y, Nd respectively by the magnesium alloy of heat treatment precipitation reinforcement.As seen, the Y in the WE series magnesium alloy, Nd element are replaced with Gd, Sm element respectively,, obtain better comprehensive mechanical performance because the higher solid solubility of Gd, Sm may obtain better solution strengthening and timeliness precipitating reinforcing effect.Gd and Sm belong to rare earth element, and timeliness is separated out nano level precipitated phase in Mg sosoloid, and this class precipitated phase thermostability is strong, not only can significantly improve the intensity of alloy room temperature, and the hot strength that keeps alloy is played an important role.
Belong to not on the same group two or more rare earth elements and mix and add magnesium matrixs, alloy separate out kinetics and the precipitated phase sequence becomes more complicated, and can further improve magnesium alloy strength.Two kinds of different group rare-earth elements mix and add magnesium alloy, and its complex intensifying effect is more obvious than the single rare earth element of planting that adds equal amts separately.Traditional casting WE54 alloy is after T6 handles, and room temperature tensile strength is 250MPa, and yield strength is 172MPa, and unit elongation is 2.0% (ASM Specialty Handbook:Magnesium andMagnesiumAlloys).Its deficiency is: lower room-temperature property has limited the widespread use of WE54 alloy.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, cast magnesium alloys of a kind of optimization and preparation method thereof is provided, by adding alloying element Gd, Sm, and, make this type of magnesium alloy have mechanical properties such as the room temperature strength more superior, TRANSIENT HIGH TEMPERATURE intensity and hardness than traditional commerce magnesium alloy by suitable melting and thermal treatment process condition.
For achieving the above object, technical scheme of the present invention is: adopting Gd is first component, because Gd is 3.82wt.% 200 ℃ of solid solubility in Mg sosoloid, for guaranteeing that alloy obtains good timeliness precipitation strength and solid solution strengthening effect, the add-on of Gd is not less than 6wt.%, too many for avoiding cost of alloy and density to increase, and the undue embrittlement of alloy, the add-on of Gd is not higher than 15wt.%; Adopting Sm is second component, and Sm can reduce the solid solubility of Gd in Mg slightly, thereby increases the timeliness precipitation strength effect of Gd, and the adding of Sm also can shift to an earlier date the appearance of timeliness peak value of hardness in addition.Sm is 0.4wt.% 200 ℃ of solid solubility in Mg sosoloid, for guaranteeing that alloy obtains good timeliness precipitation strength and solid solution strengthening effect, the add-on of Sm is not less than 2wt.%, and the maximum solid solution degree of Sm in Mg is 5.8wt.%, so the add-on of Sm should not be higher than 6wt.%.Adopt Zr as grain-refining agent, with toughness that improves alloy and the processing performance of improving alloy.
In sum, a kind of cast magnesium alloy containing rare-earth provided by the present invention, its component and weight percent thereof are: 6-15%Gd, 2-6%Sm, 0.35-0.8%Zr, the total amount of impurity element: Si, Fe, Cu and Ni is less than 0.02%, and surplus is Mg.
Cast magnesium alloy containing rare-earth preparation method provided by the invention comprises melting technology and thermal treatment process:
The melting technology of Mg-Gd-Sm-Zr alloy is: pure magnesium, master alloy Mg-Gd, Mg-Sm and Mg-Zr are preheating to 180-220 ℃, then pure magnesium have been put into SF
6/ CO
2The melt in furnace of gas shield; Magnesium ingot fusing back is at 720-760 ℃, add Mg-Gd, Mg-Sm master alloy successively, master alloy fusing back is warmed up to 760-800 ℃ and adds the Mg-Zr master alloy 740-760 ℃ of insulation 25-35 minute, treat to skim surface scum after the fusing of Mg-Zr master alloy, stirred 3-6 minute; After the stirring magnesium liquid temp is risen to 770-785 ℃ of insulation and be cooled to 750-770 ℃ after 12-15 minute, refining 3-6 minute, be warming up to 770-800 ℃ after the refining, left standstill 10-20 minute; Skim surface scum after magnesium liquid is cooled to 720-770 ℃ after leaving standstill and cast, casting is heated to 250-400 ℃ in advance with steel die, obtains Mg-Gd-Sm-Zr cast magnesium alloys of the present invention.
The concrete thermal treatment process of the present invention is:
The Mg-Gd-Sm-Zr alloy that obtains is carried out solution treatment, and solid solution temperature is 500-540 ℃, and the time is 4-10 hour, hardening; Alloy after the solution treatment carried out 4-50 hour ageing treatment under 175-250 ℃ of temperature.
Substantive distinguishing features that the present invention had and obvious improvement are:
(1) adopt Mg-Gd and Mg-Sm master alloy to add Gd and Sm element indirectly, can bring more inclusion in enough pure Mg ingot dilution master alloy fusion process, and significantly reduce the smelting temperature of alloy and reduce the residence time of alloy under comparatively high temps; During with the Zr crystal grain thinning, accomplished to try one's best and reduced, and stirred refining at a lower temperature, successfully realized under the lower normal pouring temperature of magnesium alloy, pouring into a mould, and do not reduced the thinning effect of crystal grain in the residence time of high temperature section; This has not only reduced the The amount of inclusions of alloy after the melting effectively, and the difficulty of protecting when having reduced melting effectively, and making this is that the suitability for industrialized production of alloy becomes a reality.
(2) solid solution and the ag(e)ing behavio(u)r of alloy under differing temps carried out comprehensive research, obtained solution treatment and the aging treatment process optimized; Alloy can be given full play to its solution strengthening and ageing strengthening effect under this treatment process.
(3) Mg-Gd-Sm-Zr alloy at room temperature intensity of the present invention and high temperature instantaneous stretching intensity are significantly improved with respect to the WE series alloy.With Mg-6Gd-4Sm-0.4Zr is example, and room temperature tensile strength is 327MPa after Overheating Treatment, and unit elongation is that 4.0%, 200 ℃ of tensile strength is 300MPa, and 250 ℃ of tensile strength are 295MPa; And WE54 alloy at room temperature tensile strength is 250MPa under the same terms, and unit elongation is that 2.0%, 200 ℃ of tensile strength is 245MPa, and 250 ℃ of tensile strength are 225MPa.The mechanical property of Mg-Gd-Sm-Zr alloy is apparently higher than the WE54 alloy.
Embodiment
Below by specific embodiment technical scheme of the present invention is described in detail.
Embodiment 1
The composition of alloy (weight percent) is: 6.0%Gd, and 4.0%Sm, 0.4%Zr, the total amount of impurity element Si, Fe, Cu and Ni is less than 0.02%, and surplus is Mg.
Press the mentioned component alloyage, its founding is: earlier pure magnesium, master alloy Mg-Gd, Mg-Sm and Mg-Zr are preheating to 200 ℃, then pure magnesium have been put into SF
6/ CO
2The melt in furnace of gas shield; treat that magnesium ingot fusing back adds the Mg-Gd master alloy at 720-740 ℃; Mg-Gd fusing back magnesium liquid temp gos up to 720-740 ℃; add the Mg-Sm master alloy again and make it fusing; be warmed up to 750 ℃ of insulations 30 minutes then; add the Mg-Zr master alloy after the magnesium liquid temp risen to 760-780 ℃; treat its fusing back removal surface scum; stirred 5 minutes; again the magnesium liquid temp is risen to 770 ℃ of insulations and be cooled to 750 ℃ of refinings 5 minutes after 15 minutes; be warmed up to 770-780 ℃ after the refining; left standstill 15 minutes; treat that skimming surface scum after magnesium liquid is cooled to 720-750 ℃ casts, casting is heated to 250-300 ℃ in advance with steel die, obtains the Mg-6Gd-4Sm-0.4Zr alloy.Heat treatment of alloy technology is: 535 ℃ of solution treatment 5.5 hours, 225 ℃ of isothermal agings 4 hours.
The alloy of present embodiment gained, its room temperature tensile strength is 327MPa, and yield strength is 208MPa, and unit elongation is that 3.7%, 200 ℃ tensile strength is 300MPa, and 250 ℃ tensile strength is 295MPa.
Embodiment 2
The composition of alloy (weight percent) is: 10.0%Gd, and 6.0%Sm, 0.8%Zr, the total amount of impurity element Si, Fe, Cu and Ni is less than 0.02%, and surplus is Mg.
Press the mentioned component alloyage, its founding is: earlier pure magnesium, master alloy Mg-Gd, Mg-Sm and Mg-Zr are preheating to 200 ℃, then pure magnesium have been put into SF
6/ CO
2The melt in furnace of gas shield; treat that magnesium ingot fusing back adds the Mg-Gd master alloy at 730-750 ℃; Mg-Gd fusing back magnesium liquid temp gos up to 740-760 ℃; add the Mg-Sm master alloy again and make it fusing; be warmed up to 760 ℃ of insulations 30 minutes then; add the Mg-Zr master alloy after the magnesium liquid temp risen to 780-800 ℃; treat its fusing back removal surface scum; stirred 5 minutes; again the magnesium liquid temp is risen to 780 ℃ of insulations and be cooled to 770 ℃ of refinings 5 minutes after 15 minutes; be warmed up to 770-790 ℃ after the refining; left standstill 20 minutes; treat that skimming surface scum after magnesium liquid is cooled to 750-770 ℃ casts, casting is heated to 350-400 ℃ in advance with steel die, obtains the Mg-10Gd-6Sm-0.8Zr alloy.Heat treatment of alloy technology is: 540 ℃ of solution treatment 10 hours, 200 ℃ of isothermal agings 24 hours.
The alloy of present embodiment gained, its room temperature tensile strength is 320MPa, and yield strength is 230MPa, and unit elongation is that 1.8%, 200 ℃ tensile strength is 310MPa, and 250 ℃ tensile strength is 300MPa.
Embodiment 3
The composition of alloy (weight percent) is: 15.0%Gd, and 2.0%Sm, 0.4%Zr, the total amount of impurity element Si, Fe, Cu and Ni is less than 0.02%, and surplus is Mg.
Press the mentioned component alloyage, its founding is: earlier pure magnesium, master alloy Mg-Gd, Mg-Sm and Mg-Zr are preheating to 200 ℃, then pure magnesium have been put into SF
6/ CO
2The melt in furnace of gas shield; treat that magnesium ingot fusing back adds the Mg-Gd master alloy at 740-760 ℃; Mg-Gd fusing back magnesium liquid temp gos up to 720-740 ℃; add the Mg-Sm master alloy again and make it fusing; be warmed up to 750 ℃ of insulations 30 minutes then; add the Mg-Zr master alloy after the magnesium liquid temp risen to 760-780 ℃; treat its fusing back removal surface scum; stirred 3 minutes; again the magnesium liquid temp is risen to 770 ℃ of insulations and be cooled to 760 ℃ of refinings 6 minutes after 15 minutes; be warmed up to 780-800 ℃ after the refining; left standstill 20 minutes; treat that skimming surface scum after magnesium liquid is cooled to 750-770 ℃ casts, casting is heated to 350-400 ℃ in advance with steel die, obtains the Mg-15Gd-2Sm-0.4Zr alloy.Heat treatment of alloy technology is: 520 ℃ of solution treatment 8 hours, 250 ℃ of isothermal agings 16 hours.
The alloy of present embodiment gained, its room temperature tensile strength is 370MPa, and yield strength is 250MPa, and unit elongation is that 5.2%, 200 ℃ tensile strength is 335MPa, and 250 ℃ tensile strength is 305MPa.
Claims (4)
1. cast magnesium alloy containing rare-earth is characterized in that its component and weight percent are: 6-15%Gd, 2-6%Sm, 0.35-0.8%Zr, and the total amount of impurity element Si, Fe, Cu and Ni is less than 0.02%, and surplus is Mg.
2. the preparation method of the cast magnesium alloy containing rare-earth of a claim 1, it is characterized in that: (1) is preheating to 180-220 ℃ with pure magnesium, master alloy Mg-Gd, Mg-Sm and Mg-Zr, then pure magnesium has been put into SF
6/ CO
2The melt in furnace of gas shield; (2) magnesium ingot fusing back is at 720-760 ℃, add Mg-Gd, Mg-Sm master alloy successively, master alloy fusing back is warmed up to 760-800 ℃ and adds the Mg-Zr master alloy 740-760 ℃ of insulation 25-35 minute, treat to skim surface scum after the fusing of Mg-Zr master alloy, stirred 3-6 minute; (3) after the stirring magnesium liquid temp is risen to 770-785 ℃ of insulation and be cooled to 750-770 ℃ after 12-15 minute, refining 3-6 minute, be warming up to 770-800 ℃ after the refining, left standstill 10-20 minute; (4) leave standstill and skim surface scum after back magnesium liquid is cooled to 720-770 ℃ and cast, casting is heated to 250-400 ℃ in advance with steel die, obtains the Mg-Gd-Sm-Zr alloy.
3. according to the preparation method of the cast magnesium alloy containing rare-earth of claim 2, it is characterized in that: the Mg-Gd-Sm-Zr alloy that obtains is carried out solution treatment, and temperature is that 500-540 ℃, time are 4-10 hour, hardening.
4. according to the preparation method of the cast magnesium alloy containing rare-earth of claim 3, it is characterized in that: the ageing treatment that will under 175-250 ℃ temperature, carry out 4-50 hour through the Mg-Gd-Sm-Zr alloy after the solution treatment.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101532106B (en) * | 2009-04-13 | 2010-12-08 | 河南科技大学 | Heat resisting casting rare earth magnesium alloy and preparation method thereof |
| CN102560301A (en) * | 2011-12-15 | 2012-07-11 | 燕山大学 | Low-temperature strain induced heat treatment method for magnesium-rare earth alloy |
| CN103911570A (en) * | 2014-03-26 | 2014-07-09 | 上海交通大学 | Rapid magnesium-rare earth alloy solution treatment method realized by utilizing intermediate frequency magnetic field |
| CN104152771A (en) * | 2014-07-29 | 2014-11-19 | 李克杰 | Silver and rare earth-containing high-strength heat-resistant magnesium alloy and preparation method thereof |
| CN104152772A (en) * | 2014-07-29 | 2014-11-19 | 李克杰 | Silver/strontium/rare-earth-containing high-strength heat-resistant magnesium alloy and preparation method thereof |
| CN106086563A (en) * | 2016-08-05 | 2016-11-09 | 沈阳明腾科技有限公司 | A kind of high-strength temperature-resistant cast magnesium alloy and preparation method thereof |
| CN107904465A (en) * | 2017-11-20 | 2018-04-13 | 河南科技大学 | One kind enhancing magnesium-based composite material and preparation method thereof |
| CN109321795A (en) * | 2018-11-01 | 2019-02-12 | 贵州航天风华精密设备有限公司 | A kind of magnesium alloy with electromagnetic shielding performance |
| CN110257651A (en) * | 2019-07-12 | 2019-09-20 | 陕西科技大学 | A kind of Mg-Ni-Y hydrogen bearing alloy and preparation method thereof with polyphase eutectic tissue |
| CN111763896A (en) * | 2020-06-15 | 2020-10-13 | 北京航空航天大学 | Method for regulating and controlling mechanical property of magnesium alloy by utilizing crystal boundary stability |
| CN114262811A (en) * | 2021-12-23 | 2022-04-01 | 上海交通大学 | Method for improving magnesium alloy refining effect of Mg-Zr intermediate alloy |
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2006
- 2006-12-07 CN CN 200610119266 patent/CN1962914A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101532106B (en) * | 2009-04-13 | 2010-12-08 | 河南科技大学 | Heat resisting casting rare earth magnesium alloy and preparation method thereof |
| CN102560301A (en) * | 2011-12-15 | 2012-07-11 | 燕山大学 | Low-temperature strain induced heat treatment method for magnesium-rare earth alloy |
| CN103911570A (en) * | 2014-03-26 | 2014-07-09 | 上海交通大学 | Rapid magnesium-rare earth alloy solution treatment method realized by utilizing intermediate frequency magnetic field |
| CN104152771B (en) * | 2014-07-29 | 2017-02-15 | 李克杰 | Silver and rare earth-containing high-strength heat-resistant magnesium alloy and preparation method thereof |
| CN104152772A (en) * | 2014-07-29 | 2014-11-19 | 李克杰 | Silver/strontium/rare-earth-containing high-strength heat-resistant magnesium alloy and preparation method thereof |
| CN104152771A (en) * | 2014-07-29 | 2014-11-19 | 李克杰 | Silver and rare earth-containing high-strength heat-resistant magnesium alloy and preparation method thereof |
| CN106086563A (en) * | 2016-08-05 | 2016-11-09 | 沈阳明腾科技有限公司 | A kind of high-strength temperature-resistant cast magnesium alloy and preparation method thereof |
| CN107904465A (en) * | 2017-11-20 | 2018-04-13 | 河南科技大学 | One kind enhancing magnesium-based composite material and preparation method thereof |
| CN107904465B (en) * | 2017-11-20 | 2019-09-20 | 河南科技大学 | A kind of enhancing magnesium-based composite material and preparation method thereof |
| CN109321795A (en) * | 2018-11-01 | 2019-02-12 | 贵州航天风华精密设备有限公司 | A kind of magnesium alloy with electromagnetic shielding performance |
| CN110257651A (en) * | 2019-07-12 | 2019-09-20 | 陕西科技大学 | A kind of Mg-Ni-Y hydrogen bearing alloy and preparation method thereof with polyphase eutectic tissue |
| CN111763896A (en) * | 2020-06-15 | 2020-10-13 | 北京航空航天大学 | Method for regulating and controlling mechanical property of magnesium alloy by utilizing crystal boundary stability |
| CN114262811A (en) * | 2021-12-23 | 2022-04-01 | 上海交通大学 | Method for improving magnesium alloy refining effect of Mg-Zr intermediate alloy |
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