CN1614065A - Preparation of high-strength deforming magnesium alloy - Google Patents
Preparation of high-strength deforming magnesium alloy Download PDFInfo
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- CN1614065A CN1614065A CN 200410066790 CN200410066790A CN1614065A CN 1614065 A CN1614065 A CN 1614065A CN 200410066790 CN200410066790 CN 200410066790 CN 200410066790 A CN200410066790 A CN 200410066790A CN 1614065 A CN1614065 A CN 1614065A
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Abstract
The invention was involved in the preparation method of high intensity distorted magnesium alloy. The alloy consist of 3-9%Al, 0.1-0.5%Mn, 0.01-0.5%Ti, 0.05-0.5%Zn, lower than 0.02% impurity and the rest was Mg. Industrial pure magnesium was melted completely under the protection of agent of fusion, adding commercially pure aluminium, industrial pure zinc, Al-Mn interalloy and Al-Ti interalloy. After all the metals were melted, mix them equably and removed the surface scum and then cast them. Ingots were treated evenly under 380-420deg.C for 3-8h, hold for 30-60min under 410deg.C and plastically deformed. The method was with low cost and high efficiency. The strength of extension under room temperature, yield strength and extensibility were improved obviously. The technology combined grain refining with shape change and the application range of Mg-Al magnesium alloy was increased.
Description
Technical field
That the present invention relates to is a kind of wrought magnesium alloys preparation technology, specifically is a kind of preparation of high-strength deforming magnesium alloy.Belong to class of metal materials, metallurgical class and plastic working class field.
Background technology
Along with the fast development of China's aerospace, car industry, the lightweight of the vehicles such as spacecraft and automobile just becomes eternal pursuit.Magnesium alloy has high specific tenacity, specific rigidity, than elastic feel quantity, become the focus that material supplier author pays close attention to day by day.At present, the development scale of magnesium alloy aspect practical application has only 1/50 of Aluminum, and 1/160 of Iron And Steel Industry, its major cause are that 90% magnesium alloy component obtains from the die casting mode, has limited the kind and the type of product; Most of magnesium alloy structural parts are confined to the not high small volume part of requirement of strength.And magnesium alloy thermal distortion (as extruding, rolling etc.) back alloy organizing obtains refinement, and casting flaw is eliminated, and has higher intensity than cast magnesium alloys, ductility, more diversified mechanical property.Conventional Mg-Al base magnesium alloy such as AM50A, AZ31 and AZ91D etc. have good castability, cheap cost, but its room-temperature mechanical property is obviously not enough, serious restriction its further application.
According to famous Hall-Page (Hall-Petch) formula, grain refining can obviously improve the intensity of magnesium alloy.For Mg-Al base magnesium alloy, can add β (Mg thick in the alloying element refined cast structure
17Al
12) phase, obtain tinyly, the grain-boundary strengthening phase of disperse also can be by viscous deformation refined cast structure.Find by literature search, people such as Yu Xiang are at " metal forming technology ", 2004, the employing MB15 alloy of introducing in " distortion is to the influence of MB15 magnesium alloy and structure property " literary composition of delivering 22:41-45), utilizing extrusion ratio is 24 and 65 to push, and the result thinks, by crimp, remarkable refinement magnesium alloy crystal grain obviously improves the comprehensive mechanical performance such as intensity, unit elongation of magnesium alloy.Grain size is reduced to 6～12 μ m that push attitude by 100～200 μ m of as cast condition, and tensile strength is brought up to 270～330MPa, and yield strength is brought up to 220～268MPa, and unit elongation is between 8.5%～19%.But because this extrusion process adopts a large extrusion ratio extrusion molding, squeeze is big, and unhomogeneity of deformation and stress distribution unevenness increase, and work hardening is serious, thereby has limited the range of application of this technology.
Summary of the invention
The objective of the invention is to overcome existing wrought magnesium alloys preparation technology's deficiency, propose a kind of trace Ti preparation of high-strength deforming magnesium alloy that adds, by adding thick Mg in the trace Ti refinement matrix
17Al
12Phase, simultaneously by plastic deformation process, make alloy the crystal grain fragmentation, organize more refinement, composition is more even, inside is finer and close, makes it further improve the intensity of alloy.This technology be refined crystalline strengthening and deformation strengthening in the preparation method of the high-strength deforming magnesium alloy of one, enlarged Mg-Al base Application of Magnesium scope.
The present invention is achieved by the following technical solutions, and each composition and the weight percent thereof of high-strength deforming magnesium alloy of the present invention are: 3-9%Al, 0.1-0.5%Mn, 0.01-0.5%Ti, 0.05-0.5%Zn, impurity element Fe＜0.005%, Cu＜0.015%, Ni＜0.002%, all the other are Mg.Preparation technology is as follows: at first under gas or insulating covering agent protective condition; after pure magnesium melted fully; add alloy element Al with commercial-purity aluminium, industrial-purity zinc, Al-Mn master alloy, Al-Ti master alloy form respectively; Mn, Zn, Ti; after treating that alloying element all dissolves; stir with instrument it is mixed, cast after dragging for surface scum, then ingot casting is carried out viscous deformation.
Below technology of the present invention is further specified, step is as follows:
(1) melting Mg: in smelting furnace, add the pure magnesium of oven dry, the heating melting;
(2) add Al, Mn and Zn: add commercial-purity aluminium, industrial-purity zinc and Al-Mn master alloy at 680 ℃～700 ℃;
(3) add Ti: add the Al-Ti master alloy down at 720 ℃, be incubated and stirred 3～6 minutes after 20 minutes, so that Ti fully melts;
(4) casting: continue about 15 minutes of insulation down at 720 ℃, after treating that alloying element all dissolves, stirring alloy liquid with instrument makes composition even, under 720 ℃～730 ℃ pouring temperature, left standstill 10 minutes, cast after dragging for surface scum then, castmethod can adopt die casting, low-pressure casting, permanent mold casting or sand casting.
(5) viscous deformation: ingot casting is handled 3～8h 380～420 ℃ of homogenizing, 410 ℃ of insulations 30～60 minutes, adopts extruding or binding technology to carry out plastic working then.
Described extrusion process, adopt in following two kinds any one:
1. as cast condition is directly pushed, and carries out the extruding first time when die temperature is 400 ℃, and extrusion ratio is 9～20; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 9～20.
2. push after the solid solution, ingot casting carries out the extruding first time at 415 ℃ of solid solution 20h when die temperature is 400 ℃, and extrusion ratio is 9～20; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 9～20.
Described binding technology, ingot casting is handled 3～8h 380～420 ℃ of homogenizing, 410 ℃ of insulations 30～60 minutes, rolling 9 passages that circulate then, the compression ratio of each passage is 14%, heating is 10 minutes before each passage is rolling.
Compared with prior art, the obvious refinement of the microstructure of wrought magnesium alloys of the present invention, thick Mg
17Al
12Change tiny strip or particulate state mutually into, become isolated disperse by continuous distribution and distribute.With the Mg-5Al-0.5Ti alloy is example, and grain-size is fallen sharply by 40um and is 10um, and alloy at room temperature tensile strength 292Mpa, yield strength 145MPa, unit elongation are 22%; Be that the intensity of new alloy is compared with AZ91D magnesium alloy at present commonly used and significantly improved, cost of alloy is then suitable with AZ91D.
Embodiment
Content in conjunction with technical solution of the present invention provides following examples:
Embodiment 1:
Alloying constituent (weight percent): 9.0%Al, 0.03%Ti, 0.3%Mn, 0.05%Zn, impurity element are less than 0.02%, and all the other are Mg.
The preparation of high-strength deforming magnesium alloy concrete steps are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, adopt FS simultaneously
60.5%/CO
2Mixed gas protected; (2) treat that magnesium melts fully after, add commercial-purity aluminiums, industrial-purity zinc, Al-10Mn master alloy at 680 ℃; (3) add the Al-10Ti master alloy at 720 ℃, be incubated after 20 minutes and stirred 3 minutes, so that Ti fully melts; (4) continue about 15 minutes of insulation down at 720 ℃, after treating that alloying element all dissolves, stir alloy liquid with instrument and make composition even, under 720 ℃ pouring temperature, left standstill 10 minutes, drag for then and in the low-pressure casting stove, adopt nitrogen to give behind the surface scum to compress into capable low-pressure casting; (5) ingot casting is handled 3h 420 ℃ of homogenizing, is incubated 30 minutes down at 410 ℃, adopts the direct extrusion process of as cast condition, carries out the extruding first time when die temperature is 400 ℃, and extrusion ratio is 20; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 9.The grain size of the alloy of present embodiment is 8 μ m, and room temperature tensile strength, yield strength, unit elongation reach 288MPa, 140MPa, 20% respectively.
Embodiment 2:
Alloying constituent (weight percent): 3.0%Al, 0.1%Mn, 0.5%Zn, 0.2%Ti, impurity element are less than 0.02%, and all the other are Mg.
The preparation of high-strength deforming magnesium alloy concrete steps are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, the heating melting is spread a small amount of insulating covering agent (JDF) 0.3Kg simultaneously in crucible bottom; (2) treat that magnesium melts fully after, add commercial-purity aluminiums, industrial-purity zinc, Al-10Mn master alloy at 700 ℃; (3) stirred 6 minutes after 20 minutes 720 ℃ of adding Al-10Ti master alloys, insulations, so that Ti fully melts; (4) continue about 15 minutes of insulation down at 720 ℃, after treating that alloying element all dissolves, stir alloy liquid with instrument and make composition even, under 730 ℃ pouring temperature, left standstill 10 minutes, drag for then and in the low-pressure casting stove, adopt nitrogen to give behind the surface scum to compress into capable low-pressure casting.(5) ingot casting is handled 5h 380 ℃ of homogenizing, adopts extrusion process after the solid solution then, and ingot casting is at 415 ℃ of solid solution 20h, 410 ℃ of insulations 60 minutes down, carries out first time and push when die temperature is 400 ℃ then, and extrusion ratio is 16; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 14.The grain size of the alloy of present embodiment is 15 μ m, and room temperature tensile strength, yield strength and unit elongation reach 273MPa, 135MPa, 17% respectively.
Embodiment 3:
Alloying constituent (weight percent): 5.0%Al, 0.5%Ti, 0.3%Mn, 0.2%Zn, impurity element are less than 0.02%, and all the other are Mg.
The preparation of high-strength deforming magnesium alloy concrete steps are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, the heating melting is spread a small amount of insulating covering agent (JDF) 0.3Kg simultaneously in crucible bottom; (2) treat that magnesium melts fully after, add commercial-purity aluminiums, industrial-purity zinc, Al-10Mn master alloy at 690 ℃; (3) add the Al-10Ti master alloy at 720 ℃, be incubated after 20 minutes and stirred 5 minutes, so that Ti fully melts; (4) continue about 15 minutes of insulation down at 720 ℃, after treating that alloying element all dissolves, stir alloy liquid with instrument and make composition even, under 730 ℃ pouring temperature, left standstill 10 minutes, drag for then and in the low-pressure casting stove, adopt nitrogen to give behind the surface scum to compress into capable low-pressure casting.(5) ingot casting is handled 8h 400 ℃ of homogenizing, is incubated 40 minutes down at 410 ℃, rolling 9 passages that circulate then, and the compression ratio of each passage is 14%, heating is 10 minutes before each passage is rolling.The grain size of the alloy of present embodiment is 10 μ m, and room temperature tensile strength, yield strength and unit elongation reach 292MPa, 145MPa, 22% respectively.
Embodiment 4:
Alloying constituent (weight percent): 8%Al, 0.01%Ti, 0.5%Mn, 0.4%Zn, impurity element are less than 0.02%, and all the other are Mg.
The preparation of high-strength deforming magnesium alloy concrete steps are: (1) adds pure magnesium according to mentioned component configuration alloy in electrical crucible, FS is adopted in the heating melting simultaneously
60.5%/CO
2Mixed gas protected; (2) treat that magnesium melts fully after, add commercial-purity aluminiums, industrial-purity zinc, Al-10Mn master alloy at 700 ℃; (3) add the Al-10Ti master alloy at 720 ℃, be incubated after 20 minutes and stirred 6 minutes, so that Ti fully melts; (4) continue about 15 minutes of insulation down at 720 ℃, after treating that alloying element all dissolves, stir alloy liquid with instrument and make composition even, under 730 ℃ pouring temperature, left standstill 10 minutes, drag for then and in the low-pressure casting stove, adopt nitrogen to give behind the surface scum to compress into capable low-pressure casting.(5) ingot casting is handled 3h 400 ℃ of homogenizing, is incubated 60 minutes down at 410 ℃, adopts the direct extrusion process of as cast condition, carries out the extruding first time when die temperature is 400 ℃, and extrusion ratio is 9; Then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time and pushes under 300 ℃ of the mould temperature, extrusion ratio is 20.The grain size of the alloy of present embodiment is 6 μ m, and room temperature tensile strength, yield strength and unit elongation reach 285MPa, 143Mpa, 21% respectively.
Claims (5)
1; a kind of preparation of high-strength deforming magnesium alloy; it is characterized in that; described magnesium alloy component and weight percent thereof are: 3-9%Al; 0.1-0.5%Mn, 0.01-0.5%Ti, 0.05-0.5%Zn; impurity element Fe＜0.005%; Cu＜0.014%, Ni＜0.002%, all the other are Mg; preparation technology is as follows: under gas or insulating covering agent protective condition; after pure magnesium melted fully, respectively with commercial-purity aluminium; industrial-purity zinc, the Al-Ti master alloy; Al-Mn master alloy form adds alloy element Al; Ti, Mn, Zn; after treating that alloying element all dissolves; stir with instrument it is mixed, cast after dragging for surface scum, then ingot casting is carried out viscous deformation.
2, preparation of high-strength deforming magnesium alloy according to claim 1; it is characterized in that preparation technology is divided into the fusion process and the plastic history of alloy, wherein fusion process carries out under gas or insulating covering agent protective condition; below it is done further to limit, step is as follows:
(1) melting Mg: in smelting furnace, add the pure magnesium of oven dry, the heating melting;
(2) add Al, Mn and Zn: add commercial-purity aluminium, industrial-purity zinc and Al-Mn master alloy at 680 ℃～700 ℃;
(3) add Ti: add the Al-Ti master alloy down at 720 ℃, be incubated and stirred 3～6 minutes after 20 minutes, so that Ti fully melts;
(4) casting: continue about 15 minutes of insulation down at 720 ℃, after treating that alloying element all dissolves, stirring alloy liquid with instrument makes composition even, under 720 ℃～730 ℃ pouring temperature, left standstill 10 minutes, cast after dragging for surface scum then, castmethod can adopt die casting, low-pressure casting, permanent mold casting or sand casting;
(5) distortion: ingot casting is handled 3～8h 380～420 ℃ of homogenizing, 410 ℃ of insulations 30～60 minutes, adopts extrusion process or binding technology plastic working;
3, the preparation technology of high-strength deforming magnesium alloy according to claim 2 is characterized in that, described extrusion process adopts in following two kinds any one:
1. as cast condition is directly pushed, and carries out first time extruding when die temperature is 400 ℃, and extrusion ratio is 9～20, then, extrusion 310 ℃ of insulations 30 minutes, is carried out the second time under 300 ℃ of the mould temperature and pushes, and extrusion ratio is 9～20;
2. push after the solid solution, ingot casting is at 415 ℃ of solid solution 20h, carries out the extruding first time when die temperature is 400 ℃, and extrusion ratio is 9～20, then, extrusion 310 ℃ of insulations 30 minutes, carried out the second time under 300 ℃ of the mould temperature and pushes, and extrusion ratio is 9～20.
4, preparation of high-strength deforming magnesium alloy according to claim 2 is characterized in that, castmethod adopts die casting, low-pressure casting, permanent mold casting or sand casting.
5, preparation of high-strength deforming magnesium alloy according to claim 2, its feature also are, described binding technology, and rolling 9 passages that circulate, the compression ratio of each passage is 14%, heating is 10 minutes before each passage is rolling.
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| CN100463989C (en) * | 2006-07-26 | 2009-02-25 | 哈尔滨工业大学 | Cariaceous high-damping deformation magnesium alloy and its prepn process |
| CN102383013A (en) * | 2010-08-27 | 2012-03-21 | 比亚迪股份有限公司 | Wrought magnesium alloy and preparation method thereof as well as wrought magnesium alloy product and preparation method thereof |
| CN101857933B (en) * | 2009-04-10 | 2012-05-23 | 中国科学院金属研究所 | Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof |
| CN102937235A (en) * | 2012-09-22 | 2013-02-20 | 狄石磊 | Magnesium alloy load-carrying structure plate and manufacturing method thereof |
| CN103388115A (en) * | 2012-05-07 | 2013-11-13 | 中国兵器工业第五九研究所 | Preparation method of high-toughness magnesium alloy bar |
| CN104513923A (en) * | 2015-01-28 | 2015-04-15 | 鹤壁市质量技术监督检验测试中心 | High-damping magnesium-based composite material containing barium titanate |
| CN104561715A (en) * | 2015-01-28 | 2015-04-29 | 鹤壁市质量技术监督检验测试中心 | Bismuth stannate-containing high-damping magnesium-based composite material |
| CN105349945A (en) * | 2015-10-29 | 2016-02-24 | 无锡桥阳机械制造有限公司 | Magnesium alloy diffusion and permeation technology |
| CN106244881A (en) * | 2016-06-08 | 2016-12-21 | 南阳师范学院 | A kind of high strength rare earth wrought magnesium alloy |
| CN107177762A (en) * | 2017-05-18 | 2017-09-19 | 湖南金戈新材料有限责任公司 | The secondary hot extrusion technique of AQ80M magnesium alloy profiles |
| CN107177763A (en) * | 2017-05-18 | 2017-09-19 | 湖南金戈新材料有限责任公司 | The secondary hot extrusion technique of AQ80M magnesium alloy plates |
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| CN100424210C (en) * | 2007-02-01 | 2008-10-08 | 上海交通大学 | Compression casting heat-stable magnesium alloy |
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2004
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100463989C (en) * | 2006-07-26 | 2009-02-25 | 哈尔滨工业大学 | Cariaceous high-damping deformation magnesium alloy and its prepn process |
| CN101857933B (en) * | 2009-04-10 | 2012-05-23 | 中国科学院金属研究所 | Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof |
| CN102383013A (en) * | 2010-08-27 | 2012-03-21 | 比亚迪股份有限公司 | Wrought magnesium alloy and preparation method thereof as well as wrought magnesium alloy product and preparation method thereof |
| CN103388115A (en) * | 2012-05-07 | 2013-11-13 | 中国兵器工业第五九研究所 | Preparation method of high-toughness magnesium alloy bar |
| CN103388115B (en) * | 2012-05-07 | 2016-08-03 | 中国兵器工业第五九研究所 | A kind of preparation method of magnesium alloy with high strength and ductility bar |
| CN102937235A (en) * | 2012-09-22 | 2013-02-20 | 狄石磊 | Magnesium alloy load-carrying structure plate and manufacturing method thereof |
| CN104513923A (en) * | 2015-01-28 | 2015-04-15 | 鹤壁市质量技术监督检验测试中心 | High-damping magnesium-based composite material containing barium titanate |
| CN104561715A (en) * | 2015-01-28 | 2015-04-29 | 鹤壁市质量技术监督检验测试中心 | Bismuth stannate-containing high-damping magnesium-based composite material |
| CN105349945A (en) * | 2015-10-29 | 2016-02-24 | 无锡桥阳机械制造有限公司 | Magnesium alloy diffusion and permeation technology |
| CN106244881A (en) * | 2016-06-08 | 2016-12-21 | 南阳师范学院 | A kind of high strength rare earth wrought magnesium alloy |
| CN107177762A (en) * | 2017-05-18 | 2017-09-19 | 湖南金戈新材料有限责任公司 | The secondary hot extrusion technique of AQ80M magnesium alloy profiles |
| CN107177763A (en) * | 2017-05-18 | 2017-09-19 | 湖南金戈新材料有限责任公司 | The secondary hot extrusion technique of AQ80M magnesium alloy plates |
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