CN101012524A - Compression casting heat-stable magnesium alloy - Google Patents
Compression casting heat-stable magnesium alloy Download PDFInfo
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- CN101012524A CN101012524A CN 200710037029 CN200710037029A CN101012524A CN 101012524 A CN101012524 A CN 101012524A CN 200710037029 CN200710037029 CN 200710037029 CN 200710037029 A CN200710037029 A CN 200710037029A CN 101012524 A CN101012524 A CN 101012524A
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Abstract
The invention discloses an Mg-Al based cast heatproof magnesium alloy, which comprises the following parts: 3.0-8.0 % Al, 0.30-0.60% Mn, 0.3-2.0% Y or Gd, 0.001-0.2% Ti, less than 0.005% Fe, less than 0.015%Cu, less than 0.002% Ni and Mg. The invention improves dynamic property of alloy, which reduces heat-cracking tendency of alloy.
Description
Technical field
The present invention relates to the magnesium alloy technical field, main as the light alloy components of producing automobile dynamic system, specifically be a kind of compression casting heat-stable magnesium alloy.
Background technology
Current lightweight becomes the developing direction of Hyundai Motor gradually, and magnesium alloy will be more widely used in automotive industry as the most promising light alloy.And the magnesium alloy member on the present automobile all is die casting basically.In the existing cast magnesium alloys, with being most widely used of alloys such as AZ91D, AM50, these magnesium alloy have excellent mechanical property, corrosion resistance nature and die casting performance.Yet when working temperature surpassed 120 ℃, the creep property of these alloys sharply descended, and therefore can not be used to produce structural parts such as automobile power transmission and bearing system.The automobile of researching and developing at present mainly contains alloy systems such as Mg-Al-RE, Mg-Al-Ca, Mg-Zn-Al-Ca, Mg-Al-Ca-RE, Mg-Al-Sr, Mg-Al-Si with heat resistance magnesium alloy.
Find through literature search prior art, people such as Liu Haifeng are at " Materials Science Forum ", (Materials science forum), 2005,488-489:279-282, " Development of High TemperatureCreep Resistant Magnesium Alloys for Die Casting ", studied the AZ91-Y alloy in (exploitation of compression casting heat-stable magnesium alloy) literary composition, by add weight percent in the AZ91 alloy is 1% yttrium, refinement thick β (Mg in the as-cast structure
17Al
12) phase, improve the creep property of alloy, make alloy under 150 ℃, 50MPa condition, be 0.1% through 100 hours creep compliances, well below AZ91.But,, more Mg is arranged in the alloy because the Al content in the alloy is higher
17Al
12Phase influences the resistance toheat of alloy.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of compression casting heat-stable magnesium alloy is provided, make it pass through in Mg-Al base magnesium alloy, to add master alloys such as Mg-Y, Mg-Gd, Al-Ti,, the effect of refined crystalline strengthening is arranged because Y (Gd) element can the refinement alloy grain; Y (Gd) element has bigger solid solubility in magnesium alloy, and velocity of diffusion is low, and alloy is played the solution strengthening effect; Crystal boundary annex at alloy generates stable granular Al simultaneously
2Y (Al
2Gd) phase plays the effect of precipitation strength, and has suppressed Mg
17Al
12Separating out of phase effectively improved the high-temperature behavior of alloy.The remarkable refinement of interpolation of Ti the crystal grain of alloy, improved Mg
17Al
12, Al
2Y (Al
2Gd) form of phase and distribution have improved the mechanical property of alloy.Because the addition of rare earth element and Ti is little, reduced the cost of alloy, in addition, the die casting performance of alloy is good, and can be in 150～200 ℃ temperature range, and steady operation under the 50MPa condition makes its widespread use in automotive industry become possibility.
The present invention is achieved by the following technical solutions, the component of compression casting heat-stable magnesium alloy of the present invention and weight percent thereof are: Al3.0-8.0%, Mn0.30-0.60%, Y or Gd0.3-2.0%, Ti0.001-0.1%, impurity element Fe＜0.005%, Cu＜0.015%, Ni＜0.002%, surplus are Mg.
The present invention as basal component, adds Y (Gd) crystal grain thinning with Al, generates Al
2Y (Al
2Gd) phase has effectively improved the high-temperature behavior of alloy.Adding Ti is for the refinement alloy grain, improves Al
2Y (Al
2Gd) form of phase and distribution.The adding of Mn is in order to guarantee the corrosion resistance nature of alloy.The crystal grain and the Mg of the alloy that the present invention forms
17Al
12The thick Mg that crystal boundary distributes is prolonged in the obvious refinement of phase size
17Al
12Change tiny granular particle mutually into, it is more even to distribute, Al
2Y (Al
2Gd) pattern of phase and distribution significantly improve, and the die casting performance of alloy, corrosion resistance nature are suitable with the AZ91 magnesium alloy, and the intensity of alloy, plasticity and creep-resistant property are significantly better than AE42.
The preparation method of the above-mentioned alloy of the present invention is as follows:
(1) calculate the weight percent that raw material needs according to the composition that adopts, raw material is: magnesium ingot (massfraction of Mg content is greater than 99.9%), commercial-purity aluminium, the Al-Mn master alloy, Mg-Y (Gd) master alloy (its composition is Mg75%, Y (Gd) 25%), the Al-Ti master alloy.
(2) melting technology of alloy is as follows: with pure magnesium at N
2+ 0.2%SF
6The protection of mixed gas is heating down; after treating that magnesium melts fully; add commercial-purity aluminium and Al-10Mn master alloy at 600-650 ℃; add Mg-Y or Mg-Gd master alloy at 600-660 ℃; add the Al-10Ti master alloy and under this temperature, be incubated 30 minutes at 650-740 ℃; stirred once every 5 minutes in the insulating process; after treating that alloying element dissolves fully; stir alloy with instrument; make composition even; be cooled to then under 660-680 ℃ the teeming temperature and left standstill 5-10 minute, can carry out die casting production.
Compare with existing compression casting heat-stable magnesium alloy, technology of the present invention is simple, and cost is relatively low, and by adding a spot of Y (Gd) heavy rare earth element and Ti element, alloy grain has improved Mg less than 20 μ m
17Al
12, Al
2Y (Al
2Gd) pattern of phase and distribution make tensile strength of alloys reach 271MPa, and unit elongation reaches 6.0%; At 200 ℃, under the 50MPa condition, 100 hours creep compliance is 0.26%, and at 150 ℃, under the 50MPa condition, 100 hours creep compliance is 0.07%; The die casting performance and the AM50 of alloy are suitable simultaneously, have solved the relatively poor problem of diecast magnesium alloy creep-resistant property.
Embodiment
Content in conjunction with technical solution of the present invention provides following example:
Example 1:
Alloying constituent (weight percent) is: 3.1%Al, 0.3%Mn, 0.3%Y, 0.01%Ti, impurity element are less than 0.02%, and all the other are Mg.The melting technology of alloy is: according to mentioned component configuration alloy, add 100 kilograms of pure magnesiums in the resistance crucible furnace, adopt N simultaneously
2+ 0.2%SF
6Mixed gas protected; after treating that magnesium melts fully; add commercial-purity aluminium 5.00Kg and Al-10Mn master alloy 5.5Kg at 620 ℃; add the Mg-Y master alloy at 650 ℃; add Al-10Ti master alloy 0.25Kg and under this temperature, be incubated 30 minutes at 720 ℃; stirred once every 5 minutes in the insulating process; after treating that alloying element dissolves fully; stir alloy with instrument; make composition even; be cooled under 680 ℃ the teeming temperature and left standstill 10 minutes, pour into pressure die-casting machine by quantitative gating system then and carry out die casting.This example alloy at room temperature tensile strength is that 262MPa, yield strength are that 171MPa, unit elongation are 6.5%; Tensile strength under 200 ℃ is that 176MPa, yield strength are that 134MPa, unit elongation are 14.1%; At 200 ℃, under the 50MPa condition, 100 hours creep compliance is 0.24%, and at 150 ℃, under the 50MPa condition, 100 hours creep compliance is 0.05%.
Example 2:
Alloying constituent (weight percent) is: 8.0%Al, 0.4%Mn, 1.1%Y, 0.2%Ti, impurity element are less than 0.02%, and all the other are Mg.The melting technology of alloy is: according to mentioned component configuration alloy; in the resistance crucible furnace, add 100 kilograms of pure magnesiums; the heating melting; spread a spot of insulating covering agent protection simultaneously; after treating that magnesium melts fully; add commercial-purity aluminium 6.30Kg and Al-10Mn master alloy 4.5Kg at 620 ℃; add the Mg-Y master alloy at 600-650 ℃; add Al-10Ti master alloy 2.5Kg and insulation 30 minutes under this temperature at 720 ℃, stirred once every 5 minutes in the insulating process, treat that alloying element dissolves fully after; stir alloy with instrument; make composition even, be cooled under 680 ℃ the teeming temperature and left standstill 10 minutes, pour into pressure die-casting machine by quantitative gating system then and carry out die casting.This example alloy at room temperature tensile strength is that 271MPa, yield strength are that 176MPa, unit elongation are 6.0%; Tensile strength under 200 ℃ is that 171MPa, yield strength are that 130MPa, unit elongation are 13.6%; At 200 ℃, under the 50MPa condition, 100 hours creep compliance is 0.26%, and at 150 ℃, under the 50MPa condition, 100 hours creep compliance is 0.07%.
Example 3:
Alloying constituent (weight percent) is: 4.7%Al, 0.3%Mn, 0.8%Y, 0.01%Ti, impurity element are less than 0.02%, and all the other are Mg.The melting technology of alloy is: according to mentioned component configuration alloy, add 100 kilograms of pure magnesiums in the resistance crucible furnace, adopt N simultaneously
2+ 0.2%SF
6Mixed gas protected; after treating that magnesium melts fully; add commercial-purity aluminium 5.00Kg and Al-10Mn master alloy 3.3Kg at 620 ℃; add the Mg-Y master alloy at 650 ℃; add Al-10Ti master alloy 0.12Kg and under this temperature, be incubated 30 minutes at 720 ℃; stirred once every 5 minutes in the insulating process; after treating that alloying element dissolves fully; stir alloy with instrument; make composition even; be cooled under 680 ℃ the teeming temperature and left standstill 10 minutes, pour into pressure die-casting machine by quantitative gating system then and carry out die casting.This example alloy at room temperature tensile strength is that 265MPa, yield strength are that 168MPa, unit elongation are 6.7%; Tensile strength under 200 ℃ is that 172MPa, yield strength are that 131MPa, unit elongation are 13.6%; At 200 ℃, under the 50MPa condition, 100 hours creep compliance is 0.25%, and at 150 ℃, under the 50MPa condition, 100 hours creep compliance is 0.05%.
Example 4:
Alloying constituent (weight percent) is: 5.8%Al, 0.27%Mn, 0.6%Gd, 0.2%Ti, impurity element is less than 0.02%, all the other for the melting technology of Mg alloy are: according to mentioned component configuration alloy, add 100 kilograms of pure magnesiums in the resistance crucible furnace, adopt N simultaneously
2+ 0.2%SF
6Mixed gas protected; after treating that magnesium melts fully; add commercial-purity aluminium 6.00Kg and Al-10Mn master alloy 3.0Kg at 620 ℃; add the Mg-Gd master alloy at 650 ℃; add Al-10Ti master alloy 2.5Kg and under this temperature, be incubated 30 minutes at 720 ℃; stirred once every 5 minutes in the insulating process; after treating that alloying element dissolves fully; stir alloy with instrument; make composition even; be cooled under 680 ℃ the teeming temperature and left standstill 10 minutes, pour into pressure die-casting machine by quantitative gating system then and carry out die casting.This example alloy at room temperature tensile strength is that 258MPa, yield strength are that 167MPa, unit elongation are 5.9%; Tensile strength under 200 ℃ is that 169MPa, yield strength are that 131MPa, unit elongation are 14.5%; At 200 ℃, under the 50MPa condition, 100 hours creep compliance is 0.27%, and at 150 ℃, under the 50MPa condition, 100 hours creep compliance is 0.08%.
Claims (4)
1, a kind of compression casting heat-stable magnesium alloy is characterized in that: component that comprises and weight percent thereof are: Al3.0-8.0%, Mn 0.30-0.60%, Y or Gd 0.3-2.0%, Ti 0.001-0.1%, impurity element Fe＜0.005%, Cu＜0.015%, Ni＜0.002%, surplus is Mg.
2, compression casting heat-stable magnesium alloy according to claim 1 is characterized in that, described alloy grain is less than 20 μ m.
3, compression casting heat-stable magnesium alloy according to claim 1 is characterized in that, described tensile strength of alloys reaches 271MPa, and unit elongation reaches 6.0%.
4, compression casting heat-stable magnesium alloy according to claim 1 is characterized in that, described alloy, and under 200 ℃, 50MPa condition, 100 hours creep compliance is 0.26%; Under 150 ℃, 50MPa condition, 100 hours creep compliance is 0.07%.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230116A (en) * | 2011-06-23 | 2011-11-02 | 江汉大学 | High-hardness cast magnesium alloy |
| CN103468988A (en) * | 2013-09-14 | 2013-12-25 | 天津六合镁制品有限公司 | Preparation method of magnesium alloy |
| CN104087804A (en) * | 2014-07-28 | 2014-10-08 | 农彩丽 | Creep resistant magnesium alloy and preparation method thereof |
| CN104611655A (en) * | 2013-11-04 | 2015-05-13 | 北京有色金属研究总院 | Temperature-changing deformation technology for Mg-Gd-Y alloy and subsequent processing method |
| CN105420577A (en) * | 2015-12-25 | 2016-03-23 | 嘉瑞科技（惠州）有限公司 | High-strength magnesium alloy and preparation method thereof |
| CN107604228A (en) * | 2017-08-30 | 2018-01-19 | 上海交通大学 | Corrosion-resistant diecast magnesium alloy of high heat conduction and preparation method thereof |
| CN108179337A (en) * | 2017-12-25 | 2018-06-19 | 广东省材料与加工研究所 | The diecast magnesium alloy and its pressure casting method of a kind of high temperature creep-resisting |
| CN108588524A (en) * | 2018-07-23 | 2018-09-28 | 上海交通大学 | A kind of metal mold gravity casting magnesium alloy materials and preparation method thereof |
| CN108660348A (en) * | 2017-04-01 | 2018-10-16 | 比亚迪股份有限公司 | A kind of fire-retardant wrought magnesium alloy of high strength and low cost |
| CN115449683A (en) * | 2022-10-26 | 2022-12-09 | 航天科工(长沙)新材料研究院有限公司 | Magnesium alloy and preparation method thereof |
| CN115584420A (en) * | 2022-10-24 | 2023-01-10 | 昆山晶微新材料研究院有限公司 | Particle reinforced magnesium-based composite material and processing method thereof |
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| US3947268A (en) * | 1973-08-24 | 1976-03-30 | Vera Viktorovna Tikhonova | Magnesium-base alloy |
| GB9502238D0 (en) * | 1995-02-06 | 1995-03-29 | Alcan Int Ltd | Magnesium alloys |
| CN1238545C (en) * | 2004-04-15 | 2006-01-25 | 上海交通大学 | Tireining Mg-Al-Ca creep resisting alloy and fusion casting technique |
| CN1238546C (en) * | 2004-04-22 | 2006-01-25 | 上海交通大学 | Mg-Al based magnesium alloy in high intensity and high plasticity |
| CN1279198C (en) * | 2004-09-29 | 2006-10-11 | 上海交通大学 | High-strength deforming magnesium alloy containing Ti |
| CN1257992C (en) * | 2004-09-29 | 2006-05-31 | 上海交通大学 | Preparation of high-strength deforming magnesium alloy |
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- 2007-02-01 CN CNB2007100370297A patent/CN100424210C/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230116A (en) * | 2011-06-23 | 2011-11-02 | 江汉大学 | High-hardness cast magnesium alloy |
| CN103468988B (en) * | 2013-09-14 | 2015-05-13 | 天津六合镁制品有限公司 | Preparation method of magnesium alloy |
| CN103468988A (en) * | 2013-09-14 | 2013-12-25 | 天津六合镁制品有限公司 | Preparation method of magnesium alloy |
| CN104611655B (en) * | 2013-11-04 | 2017-04-19 | 北京有色金属研究总院 | Temperature-changing deformation technology for Mg-Gd-Y alloy and subsequent processing method |
| CN104611655A (en) * | 2013-11-04 | 2015-05-13 | 北京有色金属研究总院 | Temperature-changing deformation technology for Mg-Gd-Y alloy and subsequent processing method |
| CN104087804A (en) * | 2014-07-28 | 2014-10-08 | 农彩丽 | Creep resistant magnesium alloy and preparation method thereof |
| CN105420577A (en) * | 2015-12-25 | 2016-03-23 | 嘉瑞科技（惠州）有限公司 | High-strength magnesium alloy and preparation method thereof |
| CN108660348A (en) * | 2017-04-01 | 2018-10-16 | 比亚迪股份有限公司 | A kind of fire-retardant wrought magnesium alloy of high strength and low cost |
| CN107604228A (en) * | 2017-08-30 | 2018-01-19 | 上海交通大学 | Corrosion-resistant diecast magnesium alloy of high heat conduction and preparation method thereof |
| CN107604228B (en) * | 2017-08-30 | 2019-09-27 | 上海交通大学 | Corrosion-resistant diecast magnesium alloy of high thermal conductivity and preparation method thereof |
| CN108179337A (en) * | 2017-12-25 | 2018-06-19 | 广东省材料与加工研究所 | The diecast magnesium alloy and its pressure casting method of a kind of high temperature creep-resisting |
| CN108179337B (en) * | 2017-12-25 | 2019-04-23 | 广东省材料与加工研究所 | A kind of diecast magnesium alloy and its pressure casting method of high temperature creep-resisting |
| CN108588524A (en) * | 2018-07-23 | 2018-09-28 | 上海交通大学 | A kind of metal mold gravity casting magnesium alloy materials and preparation method thereof |
| CN115584420A (en) * | 2022-10-24 | 2023-01-10 | 昆山晶微新材料研究院有限公司 | Particle reinforced magnesium-based composite material and processing method thereof |
| CN115449683A (en) * | 2022-10-26 | 2022-12-09 | 航天科工(长沙)新材料研究院有限公司 | Magnesium alloy and preparation method thereof |
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