CN1238546C - Mg-Al based magnesium alloy in high intensity and high plasticity - Google Patents
Mg-Al based magnesium alloy in high intensity and high plasticity Download PDFInfo
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- CN1238546C CN1238546C CN 200410017862 CN200410017862A CN1238546C CN 1238546 C CN1238546 C CN 1238546C CN 200410017862 CN200410017862 CN 200410017862 CN 200410017862 A CN200410017862 A CN 200410017862A CN 1238546 C CN1238546 C CN 1238546C
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Abstract
The present invention relates to a high-strenth and high-plasticity Mg-Al group magnesium alloy, which is used for the technical field of metallic materials and metallurgy. The alloy comprises the components of the percentage by weight: 3.0 to 9.0% of Al, 0.2 to 1.0% of Zn, 0.01 to 0.2% of Ti, 0.1 to 0.4% of Mn, less than 0.02% of impurity elements, and Mg as the rest. The present invention uses Al as basic components, the crystal grains of the Mg-Al group magnesium alloy are obviously refined by adding a small amount of Ti to magnesium alloy, the form and the distribution of Mg17Al12 phases are effectively improved, and the tensile strength, the yield strength and the elongation rate of the magnesium alloy are greatly increased. The present invention has the advantages of simple technology, low cost and favorable application prospect.
Description
Technical field
What the present invention relates to is a kind of alloy of metallic substance technical field, specifically is a kind of high-strength high-plasticity Mg-Al base magnesium alloy.
Background technology
Magnesium alloy is a structural metallic materials the lightest in the industrial application, but the obdurability of magnesium alloy is also lower in the prior art, the intensity of general magnesium alloy has only same process to prepare the 50-70% of aluminium alloy, and the gap between its toughness and plasticity and the aluminium alloy is just bigger, has limited the Application of Magnesium scope.Because magnesium is the close-packed hexagonal metal, slip system is few, and grain refining is more effective than the effect of body-centered and face-centered cubic metal to the effect that improves alloy mechanical property, and therefore, refined crystalline strengthening is one of main method that improves the magnesium alloy obdurability.On the other hand, second in the Mg-Al base magnesium alloy commonly used is mutually for being distributed in the thick Mg of crystal boundary
17Al
12Phase has reduced the plasticity and the intensity of alloy, and therefore, improving the form of second phase and distributing is another important method that improves the magnesium alloy performance.Find by literature search, United States Patent (USP) (United Stated Patent 4,239,535, King, et al., 1980) Fa Ming Mg-Zn-Cu alloy is by adding high-load Cu (5%, weight percent) come crystal grain thinning to improve the intensity and the plasticity of alloy, still, the mechanical property of this alloy will just can obtain by solid-solution and aging heat treatment, and the existence of high-content Cu in the alloy, make that the fusing point of alloy is higher, the founding difficulty, solidity to corrosion is relatively poor, cost is higher, particularly, the crystal grain thinning effect of this alloy Cu must could realize under the prerequisite of alloy-free element al, thereby limit the range of application of alloy.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, propose a kind of high-strength high-plasticity Mg-Al base magnesium alloy, by adding alloying element Ti, reached refining Mg-Al-based magnesium alloy crystal grain, improve Mg
17Al
12The form of phase and the effect of distribution have improved the intensity and the plasticity of alloy, have enlarged Mg-Al base Application of Magnesium scope.
The present invention is achieved by the following technical solutions, and the component prescription of alloy of the present invention is (weight percent): 3.0-9.0%Al, 0.2-1.0%Zn, 0.01-0.2%Ti, 0.1-0.4%Mn, impurity element Fe＜0.005%, Cu＜0.015%, Ni＜0.002%, all the other are Mg.The present invention as basal component, adds Ti and is on the one hand crystal grain for the refinement alloy to improve the intensity and the plasticity of alloy with Al, is in order to improve Mg on the other hand
17Al
12The form of phase and distribution further improve the intensity and the plasticity of alloy, add Mn and are in order to guarantee the corrosion resistance of alloy, and the adding of Zn can improve the castability of alloy.The crystal grain and the Mg of the alloy that the present invention forms
17Al
12The obvious refinement of phase size is along the thick Mg of crystal boundary distribution
17Al
12All change tiny granular particle mutually into, the Mg in the matrix
17Al
12The phase showed increased, it is more even to distribute, and the castability of alloy is better than the AZ91 magnesium alloy, and corrosion resistance nature and cost are suitable with magnesium alloy AZ91, and the intensity of alloy and plasticity are significantly better than AM50 under the identical castmethod and AZ91 magnesium alloy.
Screening formulation of the present invention (weight percent) is: 3.0-9.0%Al, and 0.5%Zn, 0.01-0.2%Ti, 0.2%Mn, impurity element Fe, Cu, Ni total amount are less than 0.002%, and all the other are Mg.With the Mg-5Al-0.5Zn-0.1Ti alloy is example (metal mold), and the average grain size of alloy is reduced to 43 μ m, Mg by 135 μ m
17Al
12The mean sizes of phase is reduced to 3 μ m from 23 μ m, and tensile strength of alloys is 222MPa, yield strength 156MPa, unit elongation 14%, respectively than Mg-5Al-0.5Zn alloy improved 30MPa, 15MPa, more than 6%; With commercial magnesium alloy phase ratio commonly used, the intensity of new alloy and plasticity are significantly better than the AM50 magnesium alloy under the identical castmethod, and the castability of alloy is better than the AZ91 magnesium alloy, and corrosion resistance nature and cost are suitable with magnesium alloy AZ91.
The founding of the above-mentioned alloy of the present invention; fusion process carries out under gas or insulating covering agent protective condition; after pure magnesium melted fully, add alloy element Zn, Al with industrial-purity zinc, commercial-purity aluminium, Al-Mn master alloy, Al-Ti master alloy form respectively again; Mn; Ti treats that alloying element all after the dissolving, stirs; cast after dragging for surface scum, castmethod can adopt die casting, low-pressure casting, permanent mold casting or sand casting.
Compared with prior art, the present invention has substantive distinguishing features and marked improvement, and this method technology is simple, and cost is low, by adding a spot of Ti element, not only obviously refinement the crystal grain of alloy, and obviously improved Mg
17Al
12The pattern of phase is along the thick Mg of crystal boundary distribution
17Al
12All change tiny granular particle mutually into, the Mg in the matrix
17Al
12The phase showed increased, it is more even to distribute, thereby has improved the intensity and the plasticity of alloy greatly, has solved industrial Mg-Al base magnesium alloy strength commonly used and the relatively poor problem of plasticity.
Embodiment
Content in conjunction with technical solution of the present invention provides following examples:
Embodiment 1:
The composition of alloy (weight percent) is: 9.0%Al, 0.5%Zn, 0.2%Ti, 0.2%Mn, impurity element are less than 0.02%, and all the other are Mg.The founding of alloy is: according to mentioned component configuration alloy, add 10 kilograms of pure magnesiums in electrical crucible, adopt SF simultaneously
60.5%/CO
2Mixed gas protected; after treating that magnesium melts fully; add industrial-purity zinc 0.06Kg, commercial-purity aluminium 0.50Kg and Al-10Mn master alloy 0.25Kg at 680 ℃; add Al-10Ti master alloy 0.25Kg and under this temperature, be incubated 30 minutes at 780 ℃; stirred once every 10 minutes in the insulating process; after treating that alloying element all dissolves; stirring alloy liquid with instrument makes composition even; be cooled under 720～730 ℃ the teeming temperature and left standstill 5～10 minutes, dragging for then behind the surface scum is that available pony ladle pours into pressure die-casting machine and carries out die casting.The average grain size of alloy of the present invention is 32 μ m, Mg
17Al
12The mean sizes of phase is 2.S μ m, and tensile strength of alloys is 251MPa, yield strength 162MPa, unit elongation 10%.
Embodiment 2:
The composition of alloy (weight percent) is: 5.0%Al, 0.5%Zn, 0.1%Ti, 0.2%Mn, impurity element are less than 0.02%, and all the other are Mg.The founding of alloy is: according to mentioned component configuration alloy; in electrical crucible, add 10 kilograms of pure magnesiums; adopt the insulating covering agent protection simultaneously; after treating that magnesium melts fully; add industrial-purity zinc 0.05Kg at 670 ℃; commercial-purity aluminium 0.07Kg and Al-10Mn master alloy 0.25Kg; add Al-10Ti master alloy 0.15Kg and under this temperature, be incubated 30 minutes at 760 ℃; stirred once every 10 minutes in the insulating process; after treating that alloying element all dissolves; stirring alloy liquid with instrument makes composition even; be cooled under 720～730 ℃ the teeming temperature and left standstill 5～10 minutes, dragging for then behind the surface scum is that available casting ladle carries out permanent mold casting.The average grain size of alloy of the present invention is 43 μ m, Mg
17Al
12The mean sizes of phase is 3.0 μ m, and tensile strength of alloys is 222MPa, yield strength 156MPa, unit elongation 14%.
Embodiment 3:
The composition of alloy (weight percent) is: 3.0%Al, 0.5%Zn, 0.01%Ti, 0.2%Mn, impurity element are less than 0.02%, and all the other are Mg.The founding of alloy is: according to mentioned component configuration alloy, add 10 kilograms of pure magnesiums in electrical crucible, adopt SF simultaneously
60.5%/CO
2Mixed gas protected; after treating that magnesium melts fully; add industrial-purity zinc 0.06Kg, commercial-purity aluminium 0.06Kg and Al-10Mn master alloy 0.25Kg at 650 ℃; add Al-10Ti master alloy 0.015Kg and under this temperature, be incubated 30 minutes at 750 ℃; stirred once every 10 minutes in the insulating process; after treating that alloying element all dissolves; stirring alloy liquid with instrument makes composition even; be cooled under 720～730 ℃ the teeming temperature and left standstill 5～10 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.The average grain size of alloy of the present invention is 30 μ m, Mg
17Al
12The mean sizes of phase is 2.0 μ m, and tensile strength of alloys is 232MPa, yield strength 149MPa, unit elongation 15%.
Embodiment 4:
The composition of alloy (weight percent) is: 9.0%Al, 1.0%Zn, 0.2%Ti, 0.4%Mn, impurity element are less than 0.02%, and all the other are Mg.The founding of alloy is: according to mentioned component configuration alloy, add 10 kilograms of pure magnesiums in electrical crucible, adopt SF simultaneously
60.5%/CO
2Mixed gas protected; after treating that magnesium melts fully; add industrial-purity zinc 0.11Kg, commercial-purity aluminium 0.32Kg and Al-10Mn master alloy 0.45Kg at 680 ℃; add Al-10Ti master alloy 0.25Kg and under this temperature, be incubated 30 minutes at 750 ℃; stirred once every 10 minutes in the insulating process; after treating that alloying element all dissolves; stirring alloy liquid with instrument makes composition even; be cooled under 720～730 ℃ the teeming temperature and left standstill 5～10 minutes, dragging for then behind the surface scum is that available pony ladle pours into pressure die-casting machine and carries out die casting.The average grain size of alloy of the present invention is 45 μ m, Mg
17Al
12The mean sizes of phase is 3 μ m, and tensile strength of alloys is 257MPa, yield strength 163MPa, unit elongation 9%.
Embodiment 5:
The composition of alloy (weight percent) is: 3.0%Al, 0.2%Zn, 0.01%Ti, 0.1%Mn, impurity element are less than 0.02%, and all the other are Mg.The founding of alloy is: according to mentioned component configuration alloy, add 10 kilograms of pure magnesiums in electrical crucible, adopt SF simultaneously
60.5%/CO
2Mixed gas protected; after treating that magnesium melts fully; add industrial-purity zinc 0.025Kg, commercial-purity aluminium 0.18Kg and Al-10Mn master alloy 0.12Kg at 650 ℃; add Al-10Ti master alloy 0.015Kg and under this temperature, be incubated 30 minutes at 750 ℃; stirred once every 10 minutes in the insulating process; after treating that alloying element all dissolves; stirring alloy liquid with instrument makes composition even; be cooled under 720～730 ℃ the teeming temperature and left standstill 5～10 minutes, dragging for then behind the surface scum is that available casting ladle carries out sand mold casting.The average grain size of alloy of the present invention is 51 μ m, Mg
17Al
12The mean sizes of phase is 4.0 μ m, and tensile strength of alloys is 200MPa, yield strength 135MPa, unit elongation 11%.
Claims (2)
1, a kind of high-strength high-plasticity Mg-Al base magnesium alloy is characterized in that each composition and the weight percent thereof that comprise are: 3.0-9.0%Al, 0.2-1.0%Zn, 0.01-0.2%Ti, 0.1-0.4%Mn, impurity element Fe＜0.005%, Cu＜0.015%, Ni＜0.002%, all the other are Mg.
2, high-strength high-plasticity Mg-Al base magnesium alloy according to claim 1 is characterized in that the screening formulation weight percent is: 3.0-9.0%Al, 0.5%Zn, 0.01-0.2%Ti, 0.2%Mn, impurity element Fe, Cu, Ni total amount are less than 0.002%, and all the other are Mg.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410017862 CN1238546C (en) | 2004-04-22 | 2004-04-22 | Mg-Al based magnesium alloy in high intensity and high plasticity |
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|---|---|---|---|
| CN 200410017862 CN1238546C (en) | 2004-04-22 | 2004-04-22 | Mg-Al based magnesium alloy in high intensity and high plasticity |
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| CN1563459A CN1563459A (en) | 2005-01-12 |
| CN1238546C true CN1238546C (en) | 2006-01-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424210C (en) * | 2007-02-01 | 2008-10-08 | 上海交通大学 | Compression casting heat-stable magnesium alloy |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102634710B (en) * | 2012-05-07 | 2013-08-07 | 东莞市闻誉实业有限公司 | Al-Zn-Mg alloy and preparation method thereof |
| CN103014466A (en) * | 2012-12-20 | 2013-04-03 | 常熟市东方特种金属材料厂 | Magnesium-holmium-yttrium alloy |
| CN104313424B (en) * | 2014-09-25 | 2016-08-24 | 曹惠兰 | Shock resistance diecast magnesium alloy and preparation method thereof |
| CN104561715B (en) * | 2015-01-28 | 2016-07-06 | 鹤壁市质量技术监督检验测试中心 | Height damping magnesium base composite material containing bismuth stannate |
| CN104513923B (en) * | 2015-01-28 | 2016-07-06 | 鹤壁市质量技术监督检验测试中心 | Height damping magnesium base composite material containing Barium metatitanate. |
| CN105200292B (en) * | 2015-09-21 | 2017-07-14 | 济南大学 | A kind of Mg Al Zn alloys of high intensity and preparation method thereof |
| CN106191591A (en) * | 2016-06-08 | 2016-12-07 | 南阳师范学院 | A kind of high-strength temperature-resistant compound rare-earth magnesium alloy |
| CN105951014B (en) * | 2016-07-19 | 2017-10-10 | 南阳理工学院 | A kind of heat treatment method of magnesium alloy |
| CN115558818A (en) * | 2022-09-28 | 2023-01-03 | 深圳华晔美合金科技有限公司 | Magnesium-aluminum alloy production and manufacturing process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424210C (en) * | 2007-02-01 | 2008-10-08 | 上海交通大学 | Compression casting heat-stable magnesium alloy |
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