CN103290286A - As-cast high-strength-and-toughness ma.gnesium-lithium alloy and preparation method thereof - Google Patents
As-cast high-strength-and-toughness ma.gnesium-lithium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention provides a preparation method of an as-cast high-strength-and-toughness magnesium-lithium alloy. The preparation method comprises the following steps of: mixing raw materials according to the proportion of components of the product by weight percent: 3 to 6% of Li, 1 to 4% of Al, 1 to 3% of Zn, 1.2 to 2.0% of Y, 0.8 to 2.0% of Nd, and the balance of Mg and impurity elements; smelting in the protection of argon by using a vacuum electromagnetic induction smelting furnace; heating in the smelting process by adopting a mode that power is gradually increased; finally, pouring into a metal die to obtain the as-cast alloy; casting ingots of the as-cast alloy obtained by smelting into a vacuum heating furnace; keeping the temperature of 300 DEG C for 30 hours to perform homogenization treatment. By using the preparation method, the cost for developing the high-strength-and-toughness magnesium-lithium alloy is reduced, additionally, the low density of the alloy is guaranteed, the strength of the magnesium-lithium alloy can be effectively enhanced, and the alloy plasticity is improved.
Description
Technical field
What the present invention relates to is a kind of magnesium lithium alloy, the present invention also relates to a kind of preparation method of magnesium lithium alloy.
Background technology
Magnesium lithium alloy is the lightest present structural metallic materials, and its density only has 1.35～1.65g/cm
3, the specific tenacity height, the specific rigidity height, electromagnetic wave shielding is strong, and damping performance is good, and casting and turning ability are good, and have good hot and cold deformability.Therefore, magnesium lithium alloy comes into one's own in fields such as aerospace, automobile, electronics, and has obtained tentative application.In recent years, energy-saving and emission-reduction are advocated in the whole world, cut down the consumption of energy, the advantage that the environment of preserving our planet, magnesium lithium alloy have other alloys to hardly match in this respect.At present, China's aerospace field provides opportunities and challenges to the active demand of loss of weight for exploitation and the application of magnesium lithium alloy.Therefore, the exploitation high strength magnesium lithium alloy is no matter be to environment protection or all significant to the military and national defense cause.
The intensity of magnesium lithium alloy is low to be the major issue of its widespread use of restriction.Many researchers uses the method for deformation processing (extruding, rolling etc.) to improve the intensity of alloy, this has increased the cost of alloy greatly, and, because strong basal plane texture appears in magnesium alloy easily in plastic history, the anisotropy that has caused alloy has equally also limited its widespread use as structured material greatly.Comparatively speaking, alloying is a kind of schedule of reinforcement common in magnesium alloy, and not only operation is simple for this method, also has the meaning of generally promoting.
Al, Zn are alloy elements common in the magnesium alloy.Al joins the temperature that can reduce liquidus line in the Mg alloy effectively, and the atomicity of unit weight is many, and strengthening effect is good.Along with the increase of aluminium content, the mechanical property of magnesium alloy improves gradually, is in the alloy at Mg-Li-Al, and aluminium content generally is lower than 5%.The ageing strengthening effect of the Mg-Li alloy of Zn is obvious, and is not obvious to the plasticity raising of alloy.But the adding of Zn increases alloy density, for the content that keeps low density Zn should not be excessive.Rare earth element has the cleaning action of degasification, removal of impurities in melting magnesium alloy process, can improve alloy flowability, formability and thinning microstructure effect.RE and Mg, Al, Zn etc. form Heat stability is good, and compound between refractory metal can produce dispersion-strengthened action.Y density minimum in the heavy rare earths, the lightweight of favourable alloy, but the also effect of refinement alloy branch crystal tissue, raising plasticity of Y.Light rare earths Nd not only has the effect of refined crystalline strengthening and solution strengthening in magnesium alloy, also have the effect of dispersion-strengthened.
Literature search to correlative study is found, people (Journal of Rare Earths such as Wang Mingxing, 2007,25, P233-237) carry out finding behind the alloying with Y and the AM50 magnesium alloy of Ce, the a small amount of Rare Earth Y of compound interpolation and Ce in AM50 can obtain than single adding Y or higher room temperature and the mechanical behavior under high temperature of Ce.But the effect of rare earth element composite toughening is not illustrated in its research, less than this effect not being made an appraisal and proving yet.
Summary of the invention
The object of the present invention is to provide a kind of cost low, intensity height, the high tough magnesium lithium alloy of the as cast condition that plasticity is good.The present invention also aims to provide a kind of simple to operate, be conducive to the preparation method of the high tough magnesium lithium alloy of as cast condition of large-scale promotion application.
The object of the present invention is achieved like this:
The weight percent of the high tough magnesium lithium alloy of as cast condition of the present invention consists of: Li:3-6%, Al:1-4%, Zn:1-3%, Y:1.2-2.0%, Nd:0.8-2.0%, surplus is Mg and impurity element.
Described Y adds in the magnesium melt with the form of Mg-Y master alloy, and described Nd is that the form with the Mg-Nd master alloy joins in the magnesium melt.
The preparation method of the high tough magnesium lithium alloy of as cast condition of the present invention is: with commercially pure Mg, commercially pure Li, commercially pure Al, commercially pure Zn, Mg-Y master alloy and Mg-Nd master alloy are raw material, weight percent according to component in the product consists of Li:3-6%, Al:1-4%, Zn:1-3%, Y:1.2-2.0%, Nd:0.8-2.0%, surplus is that the ratio of Mg and impurity element is mixed raw material, use the melting in argon shield of vacuum electromagnetic induction melting furnace, adopt the mode that increases power gradually to heat in the fusion process, be cast at last in the metal die, obtain cast alloy; The cast alloy ingot casting that melting obtains is incubated 30h down at 300 ℃ and carries out the homogenizing processing in vacuum furnace.
Compound interpolation Y and two kinds of rare earth elements of Nd in the high tough magnesium lithium alloy of as cast condition of the present invention, their solid solution strengthening effects in Mg can be better than independent interpolation, and are favourable to the raising of alloy strength.On the other hand because Rare Earth Y and Nd element, with the Mg element in the difference aspect atomic radius and the electronegativity of element, cause the interaction intensity between two kinds of rare earth elements and the Mg to change along with the change of Y and Nd element ratio.And after rare earth element y and Nd added with the ratio of 1.2:0.8, the Y in the alloy, Nd and Mg inter-atomic bond energy strengthened, and the bonding force when cloud density strengthens between the structure cell also strengthens thereupon, and the intensity of alloy also just increases.
The total amount of rare earth element is lower, be the characteristics in order to guarantee that the Mg-Li alloy density is little on the one hand, also be to consider to guarantee that all there is the effect of certain solution strengthening in two kinds of rare earth elements at alloy, also will take into account simultaneously and form kind, quantity and the distribution of Al-RE compound in the alloy to the influence of alloy strength on the other hand.
Magnesium lithium alloy of the present invention, the tensile strength under its room temperature is: 215Mpa-255Mpa; Unit elongation is: 12%-17%.
Lithium content is lower in the high-strength magnesium lithium alloy of as cast condition of the present invention, the low-cost characteristics of magnesium lithium alloy have been guaranteed, the Y that adds, Nd also are two kinds of more common rare earth elements, still can strengthen the intensity (apparently higher than other as-cast magnesium alloy intensity of equal lithium content) of as cast condition magnesium lithium alloy under the less situation of their weight percentages in alloy significantly.In addition, this alloy lithium content is lower, and the rotproofness of alloy and thermostability also show well.The present invention has guaranteed the low density of alloy at the cost that reduces exploitation high-strong toughness magnesium lithium alloy simultaneously, can effectively strengthen magnesium lithium alloy intensity and improve alloy plasticity.
Embodiment
For example the present invention is done in more detail below and describes:
1, the moiety of magnesium lithium alloy and weight percent thereof are: Li:5%, Al:3%, Zn:2%, surplus are Mg and impurity element thereof.The melting of alloy is to carry out in vacuum induction melting furnace, need the vacuum tightness in the stove is guaranteed below 1.0Pa before the melting, then argon gas is charged in the stove, adopt the mode that increases power gradually to heat, be cast at last in the metal die, obtain cast alloy.The resulting ingot casting of melting is incubated 30h down at 300 ℃ and carries out the homogenizing processing again in vacuum furnace, and the alloy after homogenizing is handled is processed into the tension specimen of certain size, carries out room temperature quasistatic unilateral stretching test at electronic universal tester.
The tensile strength of gained magnesium lithium alloy is: 152MPa; Unit elongation is: 10.9%
2, the moiety of magnesium lithium alloy and weight percent thereof are: Li:5%, Al:3%, Zn:2%, Y:1.2%, surplus is Mg and impurity element thereof.The melting of alloy is to carry out in vacuum induction melting furnace, need the vacuum tightness in the stove is guaranteed below 1.0Pa before the melting, then argon gas is charged in the stove, adopt the mode that increases power gradually to heat, be cast at last in the metal die, obtain cast alloy.The resulting ingot casting of melting is incubated 30h down at 300 ℃ and carries out the homogenizing processing again in vacuum furnace, and the alloy after homogenizing is handled is processed into the tension specimen of certain size, carries out room temperature quasistatic unilateral stretching test at electronic universal tester.
The tensile strength of gained magnesium lithium alloy is: 192MPa; Unit elongation is: 12.6%
3, the moiety of magnesium lithium alloy and weight percent thereof are: Li:5%, Al:3%, Zn:2%, Nd:0.8%, surplus is Mg and impurity element thereof.The melting of alloy is to carry out in vacuum induction melting furnace, need the vacuum tightness in the stove is guaranteed below 1.0Pa before the melting, then argon gas is charged in the stove, adopt the mode that increases power gradually to heat, be cast at last in the metal die, obtain cast alloy.The resulting ingot casting of melting is incubated 30h down at 300 ℃ and carries out the homogenizing processing again in vacuum furnace, and the alloy after homogenizing is handled is processed into the tension specimen of certain size, carries out room temperature quasistatic unilateral stretching test at electronic universal tester.
The tensile strength of gained magnesium lithium alloy is: 167MPa; Unit elongation is: 6.48%
4, the moiety of magnesium lithium alloy and weight percent thereof are: Li:5%, Al:3%, Zn:2%, Y:2%, surplus is Mg and impurity element thereof.The melting of alloy is to carry out in vacuum induction melting furnace, need the vacuum tightness in the stove is guaranteed below 1.0Pa before the melting, then argon gas is charged in the stove, adopt the mode that increases power gradually to heat, be cast at last in the metal die, obtain cast alloy.The resulting ingot casting of melting is incubated 30h down at 300 ℃ and carries out the homogenizing processing again in vacuum furnace, and the alloy after homogenizing is handled is processed into the tension specimen of certain size, carries out room temperature quasistatic unilateral stretching test at electronic universal tester.
The tensile strength of gained magnesium lithium alloy is: 148MPa; Unit elongation is: 9.34%
5, the moiety of magnesium lithium alloy and weight percent thereof are: Li:5%, Al:3%, Zn:2%, Nd:2%, surplus is Mg and impurity element thereof.The melting of alloy is to carry out in vacuum induction melting furnace, need the vacuum tightness in the stove is guaranteed below 1.0Pa before the melting, then argon gas is charged in the stove, adopt the mode that increases power gradually to heat, be cast at last in the metal die, obtain cast alloy.The resulting ingot casting of melting is incubated 30h down at 300 ℃ and carries out the homogenizing processing again in vacuum furnace, and the alloy after homogenizing is handled is processed into the tension specimen of certain size, carries out room temperature quasistatic unilateral stretching test at electronic universal tester.
The tensile strength of gained magnesium lithium alloy is: 183MPa; Unit elongation is: 11.8%
6, the moiety of magnesium lithium alloy and weight percent thereof are: Li:5%, Al:3%, Zn:2%, Y:1.2%, Nd:0.8%, surplus is Mg and impurity element thereof.The melting of alloy is to carry out in vacuum induction melting furnace, need the vacuum tightness in the stove is guaranteed below 1.0Pa before the melting, then argon gas is charged in the stove, adopt the mode that increases power gradually to heat, be cast at last in the metal die, obtain cast alloy.The resulting ingot casting of melting is incubated 30h down at 300 ℃ and carries out the homogenizing processing again in vacuum furnace, and the alloy after homogenizing is handled is processed into the tension specimen of certain size, carries out room temperature quasistatic unilateral stretching test at electronic universal tester.
The tensile strength of gained magnesium lithium alloy is: 231MPa; Unit elongation is: 16%
Data in the table 1 show that Y and Nd element add with the ratio of 1.2:0.8, and it is to the action effect sum of alloy highly malleablized effect much larger than Y and the Nd of the corresponding content of independent interpolation.When alloy was added the rare earth element (2%) of equivalent, Y and Nd element added with the ratio of 1.2:0.8, and it still is better than adding separately the alloy of 2%Y and 2%Nd to the highly malleablized effect of alloy.This shows that Y and Nd element adopt proper proportion to add can be than the better effects if of single interpolation, this has proved that also there is the effect of complex intensifying in these two kinds of rare earth elements, has namely realized the effect of " 1+1〉2 ".
Data in the table 1 show that Y and Nd element add with the ratio of 1.2:0.8, and it is to the action effect sum of alloy highly malleablized effect much larger than Y and the Nd of the corresponding content of independent interpolation.When alloy was added the rare earth element (2%) of equivalent, Y and Nd element added with the ratio of 1.2:0.8, and it still is better than adding separately the alloy of 2%Y and 2%Nd to the highly malleablized effect of alloy.This shows that Y and Nd element adopt proper proportion to add can be than the better effects if of single interpolation, this has proved that also there is the effect of complex intensifying in these two kinds of rare earth elements, has namely realized the effect of " 1+1〉2 ".
The different addition manners with the Nd element of table 1 Rare Earth Y are to the ratio of Mg-5Li-3Al-2Zn strength of alloy and unit elongation raising
Claims (3)
1. the high tough magnesium lithium alloy of an as cast condition, it is characterized in that weight percent consists of: Li:3-6%, Al:1-4%, Zn:1-3%, Y:1.2-2.0%, Nd:0.8-2.0%, surplus is Mg and impurity element.
2. the high tough magnesium lithium alloy of as cast condition according to claim 1 is characterized in that: described Y is that the form with the Mg-Y master alloy adds in the magnesium melt, and described Nd is that the form with the Mg-Nd master alloy joins in the magnesium melt.
3. the preparation method of the high tough magnesium lithium alloy of an as cast condition, it is characterized in that: with commercially pure Mg, commercially pure Li, commercially pure Al, commercially pure Zn, Mg-Y master alloy and Mg-Nd master alloy are raw material, weight percent according to component in the product consists of Li:3-6%, Al:1-4%, Zn:1-3%, Y:1.2-2.0%, Nd:0.8-2.0%, surplus is that the ratio of Mg and impurity element is mixed raw material, use the melting in argon shield of vacuum electromagnetic induction melting furnace, adopt the mode that increases power gradually to heat in the fusion process, be cast at last in the metal die, obtain cast alloy; The cast alloy ingot casting that melting obtains is incubated 30h down at 300 ℃ and carries out the homogenizing processing in vacuum furnace.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104928546A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | High-strength and high-modulus casting Mg-RE alloy and preparation method thereof |
| CN106148787A (en) * | 2016-08-22 | 2016-11-23 | 上海交通大学 | Magnesium lithium alloy being suitable to sand casting and preparation method thereof |
| CN107779708A (en) * | 2017-12-08 | 2018-03-09 | 浙江海洋大学 | A kind of high intensity super-light Mg-Li alloy and preparation method thereof |
| US10280496B2 (en) * | 2016-01-07 | 2019-05-07 | Amli Materials Technology Co., Ltd. | Light magnesium alloy and method for forming the same |
| CN111235413A (en) * | 2020-02-08 | 2020-06-05 | 苏州轻金三维科技有限公司 | Preparation method of high-strength ultralight metal material |
| CN113249601A (en) * | 2021-05-18 | 2021-08-13 | 哈尔滨工业大学 | Alloying method for inducing icosahedron quasicrystal phase in-situ self-generated strengthening cast aluminum-lithium alloy |
| CN114752832A (en) * | 2022-05-17 | 2022-07-15 | 郑州轻研合金科技有限公司 | High-strength low-notch sensitivity magnesium-lithium alloy and preparation method and application thereof |
-
2013
- 2013-06-08 CN CN2013102297380A patent/CN103290286A/en active Pending
Non-Patent Citations (3)
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| WU LI-BIN ET AL: "Microstructure and tensile properties of Mg−Li−Al−Zn based alloys with Ce addition", 《TRANS. NONFERROUS MET. SOC. CHINA》 * |
| WU LI-BIN ET AL: "Microstructure and tensile properties of Mg−Li−Al−Zn based alloys with Ce addition", 《TRANS. NONFERROUS MET. SOC. CHINA》, vol. 22, 31 December 2012 (2012-12-31), pages 779 - 785 * |
| 崔崇亮等: "复合添加Y和Nd对Mg-Li合金显微组织及室温压缩织构的影响", 《金属学报》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104928546A (en) * | 2015-06-16 | 2015-09-23 | 上海交通大学 | High-strength and high-modulus casting Mg-RE alloy and preparation method thereof |
| CN104928546B (en) * | 2015-06-16 | 2017-11-14 | 上海交通大学 | A kind of high strength and modulus casting magnesium-rare earth alloy and preparation method thereof |
| US10280496B2 (en) * | 2016-01-07 | 2019-05-07 | Amli Materials Technology Co., Ltd. | Light magnesium alloy and method for forming the same |
| CN106148787A (en) * | 2016-08-22 | 2016-11-23 | 上海交通大学 | Magnesium lithium alloy being suitable to sand casting and preparation method thereof |
| CN106148787B (en) * | 2016-08-22 | 2019-06-21 | 上海交通大学 | Magnesium lithium alloy and preparation method thereof suitable for sand casting |
| CN107779708A (en) * | 2017-12-08 | 2018-03-09 | 浙江海洋大学 | A kind of high intensity super-light Mg-Li alloy and preparation method thereof |
| CN111235413A (en) * | 2020-02-08 | 2020-06-05 | 苏州轻金三维科技有限公司 | Preparation method of high-strength ultralight metal material |
| CN111235413B (en) * | 2020-02-08 | 2021-04-02 | 苏州轻金三维科技有限公司 | Preparation method of high-strength ultralight metal material |
| CN113249601A (en) * | 2021-05-18 | 2021-08-13 | 哈尔滨工业大学 | Alloying method for inducing icosahedron quasicrystal phase in-situ self-generated strengthening cast aluminum-lithium alloy |
| CN113249601B (en) * | 2021-05-18 | 2022-04-29 | 哈尔滨工业大学 | Alloying method for inducing icosahedron quasicrystal phase in-situ self-generated strengthening cast aluminum-lithium alloy |
| CN114752832A (en) * | 2022-05-17 | 2022-07-15 | 郑州轻研合金科技有限公司 | High-strength low-notch sensitivity magnesium-lithium alloy and preparation method and application thereof |
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Application publication date: 20130911 |