CN102031432A - Sn-containing fine-grained magnesium-lithium tin alloy - Google Patents
Sn-containing fine-grained magnesium-lithium tin alloy Download PDFInfo
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- CN102031432A CN102031432A CN 201010600729 CN201010600729A CN102031432A CN 102031432 A CN102031432 A CN 102031432A CN 201010600729 CN201010600729 CN 201010600729 CN 201010600729 A CN201010600729 A CN 201010600729A CN 102031432 A CN102031432 A CN 102031432A
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Abstract
The invention provides a Sn-containing fine-grained magnesium-lithium tin alloy, which consists of the following components in percentage by mass: 10 to 15 percent of Li, 1.0 to 5.0 percent of Sn, less than or equal to 0.30 percent of unavoidable impurity elements and the balance of Mg. A preparation method comprises the following steps of: adding the Sn into a magnesium-lithium alloy, smelting in a vacuum induction smelting furnace, and preserving heat and standing for 20 minutes after the alloy is completely smelted; and completely solidifying the alloy to obtain an as-cast magnesium-lithium tin alloy, wherein the whole smelting process is performed under the protection of argon gas. After the Sn is added, the microstructure of a magnesium-lithium tin alloy ingot is fine and uniform, strength and plasticity are increased, subsequent processability is high, production cost is low, and the alloy is suitable for large-scale industrial production; meanwhile, the problem of overaging of an aluminum-containing magnesium-lithium alloy is solved.
Description
Technical field
The present invention relates to the novel magnesium alloy material, particularly a kind of Sn's of containing has magnesium lithium alloy of small grains and preparation method thereof.
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Background technology
Along with transport facility cuts down the consumption of energy and the enhancing of environmental protection requirement, and the development of electronic industry and aerospace flight technology, exploitation low density, high-intensity structural metallic materials are very urgent.The Mg-Li alloy is present the lightest structural metallic materials, is one of alloy system of the tool potentiality of development ultralight high-strength alloy, becomes the focus of domestic and international research in recent years.The Mg-Li alloy not only has high specific strength, high impact toughness, good machinability, also has good magnetic shielding, damping performance and anti-high energy particle penetrativity, therefore has been subjected to fields such as aerospace, weapons, electronics and has extensively paid attention to.
LA141 be present domestic and international application the most widely Mg-Li-Al be alloy designations.Al is a modal alloy element in the Mg-Li alloy, can make matrix alloy produce solution strengthening and ageing strengthening, and the Mg-Li alloy mechanical property is improved.Mg-Li-Al is that though this alloy is a close-packed hexagonal structure, Li can reduce axial ratio when Li content was less than 5.7wt% in the alloy, can significantly improve plasticity; But Li content surpasses 5.7wt%, has β (Li) phase of body-centered cubic structure in this alloy, and the plasticity of alloy increases substantially.But because Mg-Li alloy character is active, current main founding mode is die casting, and therefore, its as-cast structure is thick, and intensity is lower.And, inevitably contain MgLi in the Mg-Li-Al alloy
2Al intermetallic compound, this compound will be decomposed into AlLi or MgLiAl when carrying out timeliness under low temperature even room temperature
2Intermetallic compound, these two kinds of compounds do not have strengthening effect substantially to matrix, thereby the intensity of this alloy is reduced, and cause low temperature overaging phenomenon.Therefore, the aging stability of Mg-Li-Al alloy is poor, has the overaging phenomenon, has restricted the development of Mg-Li alloy to a certain extent.In order to improve the intensity of Mg-Li alloy, enlarge its range of application, usually the method that adopts mainly contains multi-element alloyed, matrix material reinforcement etc.But the unit elongation of Zhi Bei alloy reduces significantly like this, and the properties for follow of alloy is worsened.Therefore, it is to be the intensity that cost improves magnesium lithium alloy to sacrifice plasticity significantly to a great extent that multi-element alloyed and matrix material is strengthened, and the excellent plasticity distinguishing feature of magnesium lithium alloy just.Rapid solidification-powder metallurgy is crystal grain thinning significantly, improve plasticity and intensity, but cost is too high, and industrialized popularization value is not high.Q. Xiang etc. has studied Mg-5Li-3Al-2Zn-(0.5-2.0) Sn(Journal of Alloys and Compounds 477 (2009) 832-835), but the basic structure of this alloy is close-packed hexagonal, contain more Al and Zn element, belong to multi-element alloyed, cause the plasticity of alloy relatively poor.Simultaneously, there is a large amount of MgLi in the alloy
2There is significant overaging phenomenon in the Al compound.
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Summary of the invention
At the prior art above shortcomings, the object of the present invention is to provide the Mg-Li-Sn alloy material of a kind of Sn of containing, solve the contradiction that existing Mg-Li alloy plasticity and intensity exist.
Realize that the object of the invention technical scheme is: this contains the thin brilliant magnesium lithium-tin alloy material of Sn is to be formed by pure magnesium, pure lithium, pure tin melting, and the quality percentage composition of each component of alloy is Li:10-15%; Sn:1.0-5.0%; Inevitable impurity element≤0.30%; Rest part is Mg.
The present invention's technical scheme preferably is: the thin brilliant magnesium lithium-tin alloy of a kind of Sn of containing, it is characterized in that forming by Mg, Li, Sn and inevitable impurity, and the quality percentage composition of its each component is: Li:14.0%; Sn:3.5%; Inevitable impurity element≤0.30%; Rest part is Mg.
The inevitable impurity element of the present invention is Mn, Fe, Si, Ni, its total amount of Cu, Na≤0.30%.
Preparation method of the present invention comprises: Sn is joined in the magnesium lithium alloy, and this alloy is formed by pure magnesium, pure lithium, pure tin melting, and its purity is all more than 99.90%.Melting is carried out in vacuum induction melting furnace, and various components are put into stainless steel or corundum crucible together according to corresponding addition.With being evacuated to vacuum state in the stove, feed argon gas again before the melting.Begin melting then, treat that alloy melts fully after, the insulation left standstill 20 minutes.Leave standstill in the process, the function composite by electromagnetic stirring of induction melting furnace can make alloying constituent even.Cut off the power supply of induction melting furnace then, solidify fully, then crucible is taken out, obtain as cast condition magnesium lithium-tin alloy up to alloy.Whole fusion process all is under the argon shield state.
According to national standard, the trade mark is that LA141 is meant that containing the lithium amount is that 13.0-15.0%, aluminum content are the magnesium lithium alloy of 1.0-1.5%, and this class material as-cast structure is thick, and intensity is lower, has the overaging phenomenon.
Among the present invention, the Sn of adding plays the effect of three aspects, and the one, Sn and Mg, Li reaction generate MgLi
2Sn, it has good crystallography matching relationship mutually with β-Li in the magnesium lithium-tin alloy, therefore has the effect of remarkable refinement magnesium lithium alloy tissue in process of setting; Two, this compound can stable existence in ag(e)ing process, can not decompose, and therefore, also can play second effect of strengthening mutually; The 3rd, the unreacted Sn of part can be solidly soluted in β-Li matrix, plays the effect of solution strengthening.Therefore, behind the adding Sn, the microstructure of magnesium lithium-tin alloy ingot casting is more tiny evenly, and intensity and plasticity increase, and properties for follow is good, and production cost is low, is suitable for industrial scale operation.Simultaneously, avoided containing the overaging problem of magnalium lithium alloy.
Figure of description
Fig. 1 is the as-cast structure figure of LA141 alloy;
Fig. 2 is the as-cast structure figure of Mg-14Li-3.5Sn alloy.
Embodiment
The present invention is described further below by embodiment; it should be understood that these embodiment are used to illustrate the present invention, rather than limitation of the present invention; under design prerequisite of the present invention,, all belong to the scope of protection of present invention to preparation method's of the present invention simple modifications.
With following prescription and melting method, can obtain the magnesium lithium alloy material of interpolation Sn of the present invention:
Embodiment 1:Adopt following prescription (mass percent) Mg:82.20%; Li:14.0%; Sn:3.5%; Mn, Fe, Si, Ni, Cu and Na add up to less than 0.30%, and melting is carried out in vacuum induction melting furnace, and various components are put into Stainless Steel Crucible together according to corresponding addition.Earlier with being evacuated to vacuum state in the stove, feeds argon gas again before the melting, begins melting then, treat that alloy melts fully after, insulation was left standstill 20 minutes, cut off the power supply of induction melting furnace then, treat that alloy solidifies fully after, crucible is taken out, obtain cast alloy.It is pointed out that whole fusion process all is under the argon shield state.
Utilize division lines method that the grain-size of gained magnesium lithium alloy is measured, obtaining its average grain size is 700 m.The novel magnesium lithium-tin alloy that adopts present method to make, its as-cast grain size is 700 m (Fig. 2), significantly is lower than with the 1750 m(Fig. 1 of the LA141 alloy under the state).
Embodiment 2:Adopt following prescription (mass percent) Mg:86.70%; Li:12.0%; Sn:1.0%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%, and melting is carried out in vacuum induction melting furnace, and various components are put into Stainless Steel Crucible together according to corresponding addition.Earlier with being evacuated to vacuum state in the stove, feeds argon gas again before the melting, begins melting then, treat that alloy melts fully after, insulation was left standstill 20 minutes, made the abundant alloying of raw material of adding, cut off the power supply of induction melting furnace then, solidify fully up to alloy, crucible is taken out, obtain cast alloy.It is pointed out that whole fusion process all is under the argon shield state.
Utilize division lines method that the grain-size of gained magnesium lithium alloy is measured, obtaining its average grain size is 750 m.
Embodiment 3:Adopt following prescription (mass percent) Mg:86.70%; Li:10.0%; Sn:3.0%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%, and melting is carried out in vacuum induction melting furnace, and various components are put into Stainless Steel Crucible together according to corresponding addition.Earlier with being evacuated to vacuum state in the stove, feeds argon gas again before the melting, begins melting then, treat that alloy melts fully after, insulation was left standstill 20 minutes, cut off the power supply of induction melting furnace then, treat that alloy solidifies fully after, crucible is taken out, obtain cast alloy.It is pointed out that whole fusion process all is under the argon shield state.
Utilize division lines method that the grain-size of gained magnesium lithium alloy is measured, obtaining its average grain size is 800 m.
Embodiment 4:Adopt following prescription (mass percent) Mg:82.70%; Li:13.0%; Sn:4.0%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%, and melting is carried out in vacuum induction melting furnace, and various components are put into Stainless Steel Crucible together according to corresponding addition.Earlier with being evacuated to vacuum state in the stove, feeds argon gas again before the melting, begins melting then, treat that alloy melts fully after, insulation was left standstill 20 minutes, cut off the power supply of induction melting furnace then, treat that alloy solidifies fully after, crucible is taken out, obtain cast alloy.It is pointed out that whole fusion process all is under the argon shield state.
Utilize division lines method that the grain-size of gained magnesium lithium alloy is measured, obtaining its average grain size is 820 m.
Embodiment 5:Adopt following prescription (mass percent) Mg:80.20%; Li:15.0%; Sn:4.5%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%, and melting is carried out in vacuum induction melting furnace, and various components are put into Stainless Steel Crucible together according to corresponding addition.Earlier with being evacuated to vacuum state in the stove, feeds argon gas again before the melting, begins melting then, treat that alloy melts fully after, insulation was left standstill 20 minutes, cut off the power supply of induction melting furnace then, treat that alloy solidifies fully after, crucible is taken out, obtain cast alloy.It is pointed out that whole fusion process all is under the argon shield state.
Utilize division lines method that the grain-size of gained magnesium lithium alloy is measured, obtaining its average grain size is 860 m.
Embodiment 6:Adopt following prescription (mass percent) Mg:80.70%; Li:14.0%; Sn:5.0%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%, and melting is carried out in vacuum induction melting furnace, and various components are put into Stainless Steel Crucible together according to corresponding addition.Earlier with being evacuated to vacuum state in the stove, feeds argon gas again before the melting, begins melting then, treat that alloy melts fully after, insulation was left standstill 20 minutes, cut off the power supply of induction melting furnace then, treat that alloy solidifies fully after, crucible is taken out, obtain cast alloy.It is pointed out that whole fusion process all is under the argon shield state.
Utilize division lines method that the grain-size of gained magnesium lithium alloy is measured, obtaining its average grain size is 900 m.
The crystalline structure of Mg-Li-Sn alloy of the present invention is a body-centered cubic, and as-cast structure is tiny, has good intensity and plasticity, and properties for follow is good.
Claims (3)
1. one kind contains the thin brilliant magnesium lithium-tin alloy of Sn, it is characterized in that this magnesium lithium alloy material is to be formed by pure magnesium, pure lithium, pure tin melting, and the quality percentage composition of each component of alloy is Li:10-15%; Sn:1.0-5.0%; Inevitable impurity element≤0.30%; Rest part is Mg.
2. the thin brilliant magnesium lithium-tin alloy of Sn that contains according to claim 1 is characterized in that the quality percentage composition of its each component is: Li:14.0%; Sn:3.5%; Inevitable impurity element≤0.30%; Rest part is Mg.
3. contain the preparation method of the thin brilliant magnesium lithium-tin alloy of Sn as claimed in claim 1 or 2, it is characterized in that, comprise the steps: at first, various components are put into stainless steel or corundum crucible together according to corresponding addition, crucible is put into induction melting furnace; To be evacuated to vacuum state in the stove before the melting, feed argon gas again to normal pressure;
Then, begin the heating, treat that alloy melts fully after, left standstill 20 minutes 720 ℃ of insulations;
At last, cut off the power supply of induction melting furnace, solidify fully, then crucible is taken out, obtain as cast condition magnesium lithium-tin alloy up to alloy; Whole fusion process all is under the argon shield state.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217185A (en) * | 2017-06-03 | 2017-09-29 | 郑州汉东科技有限公司 | A kind of degradable medical implant |
| CN109112373A (en) * | 2018-08-13 | 2019-01-01 | 江苏理工学院 | A kind of preparation method of high intensity Mg-Li-Sn-Zn ultra-light alloy |
| CN115896571A (en) * | 2022-11-28 | 2023-04-04 | 东北大学 | Heat-resistant light magnesium alloy and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USH1411H (en) * | 1992-11-12 | 1995-02-07 | Deshmukh; Uday V. | Magnesium-lithium alloys having improved characteristics |
| CN101386945A (en) * | 2008-11-03 | 2009-03-18 | 南京信息工程大学 | Toughness magnesium alloy and preparation method thereof |
| CN101713034A (en) * | 2009-12-11 | 2010-05-26 | 重庆大学 | Method for refining LA141 magnesium-lithium alloy grains |
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2010
- 2010-12-22 CN CN 201010600729 patent/CN102031432A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USH1411H (en) * | 1992-11-12 | 1995-02-07 | Deshmukh; Uday V. | Magnesium-lithium alloys having improved characteristics |
| CN101386945A (en) * | 2008-11-03 | 2009-03-18 | 南京信息工程大学 | Toughness magnesium alloy and preparation method thereof |
| CN101713034A (en) * | 2009-12-11 | 2010-05-26 | 重庆大学 | Method for refining LA141 magnesium-lithium alloy grains |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107217185A (en) * | 2017-06-03 | 2017-09-29 | 郑州汉东科技有限公司 | A kind of degradable medical implant |
| CN109112373A (en) * | 2018-08-13 | 2019-01-01 | 江苏理工学院 | A kind of preparation method of high intensity Mg-Li-Sn-Zn ultra-light alloy |
| CN115896571A (en) * | 2022-11-28 | 2023-04-04 | 东北大学 | Heat-resistant light magnesium alloy and preparation method thereof |
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Application publication date: 20110427 |