CN101381833A - Heat resisting casting magnesium alloy and preparation method thereof - Google Patents
Heat resisting casting magnesium alloy and preparation method thereof Download PDFInfo
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- CN101381833A CN101381833A CNA2008102016085A CN200810201608A CN101381833A CN 101381833 A CN101381833 A CN 101381833A CN A2008102016085 A CNA2008102016085 A CN A2008102016085A CN 200810201608 A CN200810201608 A CN 200810201608A CN 101381833 A CN101381833 A CN 101381833A
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Abstract
The invention provides a heat-resistant cast magnesium alloy, which belongs to the technical field of metal material and comprises the following compositions in percentage by weight: 1.5 to 4.5 percent of yttrium, 0.4 to 1.5 percent of zinc, 0.2 to 0.7 percent of zirconium, impurity elements: less than 0.005 percent of ferrite, less than 0.015 percent of copper and less than 0.002 percent of nickel and the balance of magnesium. The heat-resistant cast magnesium alloy is low in cost and high in efficiency, has good tensile strength, yield strength and elongation, and meanwhile has perfect creep resistance property and good casting property.
Description
Technical field
What the present invention relates to is magnesium alloy of a kind of metallic substance technical field and preparation method thereof, and specifically, what relate to is a kind of heat resistance casting 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-RE-zn, 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.Obtained manufacturing experimently in the heat resistance magnesium alloy of research at these, the Mg-RE-Zn alloy has stable microstructure being lower than 200 ℃, and the good high-temperature creep-resistant property is arranged.
Find through literature search prior art, Mg-RE-Zn-Zr alloy (the patent No.: WO2006105594A1) of Australia's CAST research centre exploitation, be primarily aimed under the working conditions that is lower than 200 ℃ and use, with Nd is the main rare earth element that adds, add the mishmetal of rich Ce on this basis, and add an amount of Zn, Zr.This alloy has good creep-resistant property being lower than under 200 ℃ the condition.Its weak point is: the kind of the alloying element that adds is too much on the one hand, the technology more complicated, and the tensile strength of alloy under room temperature and hot conditions is lower on the other hand.In addition, in the research at the Mg-Y-Zn-Zr quad alloy, the content of general Y exists tangible deficiency all than higher at present: the content of Y is higher on the one hand, the cost height; On the other hand, the content of Y is higher in the alloy, has significantly reduced the flowability of alloy, has influenced the castability of alloy.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, a kind of heat resistance casting magnesium alloy is provided, make it pass through to adjust Nd of the prior art and mishmetal, add an amount of Zn and Zr simultaneously, and the content of the Y element that adds is lower with Y element.By adopting this alloy both to guarantee the alloy advantages of good casting, realized excellent room temperature intensity, hot strength and the creep-resistant property of alloy simultaneously.
The present invention is achieved by the following technical solutions:
The component of casting heat-resistant magnesium alloy involved in the present invention and weight percent thereof are: 1.5-4.5%Y, and 0.4-1.5%Zn, 0.2-0.7%Zr, impurity element Fe＜0.005%, Cu＜0.015%, Ni＜0.002%, all the other are Mg.
The component of casting heat-resistant magnesium alloy of the present invention and weight percent preferred version one thereof are: 1.5%Y, 1.5%Zn, 0.7%Zr, impurity content are less than 0.02%, and all the other are Mg.
The component of casting heat-resistant magnesium alloy of the present invention and weight percent preferred version two thereof are: 3%Y, 0.8%Zn, 0.45%Zr, impurity content are less than 0.02%, and all the other are Mg.
The component of casting heat-resistant magnesium alloy of the present invention and weight percent preferred version three thereof are: 4.5%Y, 0.4%Zn, 0.2%Zr, impurity content are less than 0.02%, and all the other are Mg.
Above-mentioned casting heat-resistant magnesium alloy preparation method involved in the present invention comprises the steps:
The first step, than calculating the weight percent that raw material needs, raw material is: magnesium ingot (massfraction of Mg content is greater than 99.9%), industrial-purity zinc, Mg-Y master alloy, Mg-Zr master alloy according to each set of dispense.
Second the step, the melting technology of alloy is as follows: with pure magnesium at CO
2+ 0.2%SF
6The protection of mixed gas is heating down; after treating that pure magnesium melts fully; add industrial-purity zinc at 660-680 ℃; in the time of 720～740 ℃, add the Mg-Y master alloy; add the Mg-Zr master alloy at 760-770 ℃; be incubated after 2-3 minute and stir; be warming up to again 780-790 ℃ and under this temperature the insulation about 10 minutes; then with temperature regulation to 750-760 ℃ of refining, and be cooled to 720～740 ℃ after being incubated 30 minutes and carry out gravitational casting or be cooled to 695-715 ℃ carrying out die casting or 700 ℃ and carrying out extrusion casting.
Rare Earth Y in the alloy of the present invention and Mg form the Mg with high thermal stability
24Y
5Strengthening phase, this mainly distributes along crystal boundary mutually, has effectively hindered the crystal boundary slippage; Y solid solution simultaneously can obtain the better solid solution strengthening effect than Nd in alloy substrate.Thereby improve alloy at room temperature and high temperature tensile strength.The main solid solution of Zn is in Mg
24Y
5Mutually, improved the high-temperature creep resistance of alloy; The adding of Zn simultaneously can improve the flowability of alloy.The remarkable refinement of adding of Zr crystal grain, improved the intensity and the plasticity of alloy.
For alloy flowability, little because the Y that adds in this alloy is less to the flowability affects of pure magnesium, and, improved the flowability of alloy, so this alloy has good flowing property because Y can purify melt.
Compare with existing casting heat-resistant magnesium alloy, cost of the present invention is lower, the production efficiency height.Alloy of the present invention all has good tensile strength, yield strength, unit elongation in room temperature and high temperature, has good creep-resistant property simultaneously, and has advantages of good casting.Alloy at room temperature tensile strength surpasses 200MPa under the gravitational casting condition, yield strength surpasses 90MPa, unit elongation above 20%, at 200 ℃, under the 60MPa condition, 100 hours creep compliance is all less than 0.1%, and alloy at room temperature tensile strength all surpasses 130MPa, unit elongation above 10% above 220MPa, yield strength under die casting or the extrusion casting condition, at 200 ℃, under the 70MPa condition, 100 hours creep compliance is all less than 0.1%.
Embodiment
Below embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Example 1:
Alloying constituent (weight percent) is: 1.5%Y, 1.5%Zn, 0.7%Zr, impurity content are less than 0.02%, and all the other are Mg.The melting technology of alloy is: according to mentioned component configuration alloy, add pure magnesium 172Kg in the resistance crucible furnace, adopt CO simultaneously
2+ 0.2%SF
6Mixed gas protected; after treating that magnesium melts fully; add industrial-purity zinc 3Kg at 660 ℃; in the time of 720 ℃, add Mg-25Y master alloy 17.1Kg, add Mg-30Zr master alloy 15.5Kg, be incubated after 2～3 minutes and stir at 760 ℃; be warming up to 780 ℃ and under this temperature the insulation 10 minutes; temperature is reduced to 750～760 ℃ again and carries out refining, be incubated afterwards about 30 minutes, be cooled to 740 ℃ and carry out gravity casting or carry out die casting or 700 ℃ at 705 ℃ and carry out extrusion casting.
Alloy at room temperature tensile strength in this example under the gravity casting condition is that 205MPa, yield strength are that 93MPa, unit elongation are 24%; Tensile strength under 200 ℃ is that 150MPa, yield strength are that 79MPa, unit elongation are 32%; At 200 ℃, under the 60MPa condition, 100 hours creep compliance is 0.072%.And the alloy at room temperature tensile strength of die casting is 225MPa, yield strength is that 138MPa, unit elongation are 16.6%; Tensile strength under 200 ℃ is that 173MPa, yield strength are that 119MPa, unit elongation are 23.7%; At 200 ℃, under the 60MPa condition, 100 hours creep compliance is 0.07%, and at 200 ℃, under the 90MPa condition, 100 hours creep compliance is 0.11%.
Example 2:
Alloying constituent (weight percent) is: 3%Y, 0.8%Zn, 0.45%Zr, impurity content are less than 0.02%, and all the other are Mg.The melting technology of alloy is: according to mentioned component configuration alloy, add pure magnesium 160Kg in the resistance crucible furnace, adopt CO simultaneously
2+ 0.2%SF
6Mixed gas protected; after treating that magnesium melts fully; add industrial-purity zinc 1.4Kg at 660 ℃; Mg-25Y master alloy 33.8Kg adds Mg-30Zr master alloy 10Kg at 760 ℃, is incubated after 2～3 minutes and stirs; be warming up to 780 ℃ and under this temperature the insulation 10 minutes; temperature is reduced to 750～760 ℃ again and carries out refining, be incubated afterwards about 30 minutes, be cooled to 730 ℃ and carry out gravity casting or carry out die casting or carry out extrusion casting at 700 ℃ at 705 ℃.
Alloy at room temperature tensile strength under this example gravity casting condition is that 208MPa, yield strength are that 96MPa, unit elongation are 23%; Tensile strength under 200 ℃ is that 160MPa, yield strength are that 84MPa, unit elongation are 30%; At 200 ℃, under the 60MPa condition, 100 hours creep compliance is 0.069%.And the alloy at room temperature tensile strength of die casting is 231.3MPa, yield strength is that 140.6MPa, unit elongation are 13.2%; Tensile strength under 200 ℃ is that 185MPa, yield strength are that 127MPa, unit elongation are 21.8%; At 200 ℃, under the 60MPa condition, 100 hours creep compliance is 0.06%, and at 200 ℃, under the 90MPa condition, 100 hours creep compliance is 0.09%.
Example 3:
Alloying constituent (weight percent) is: 4.5%Y, 0.4%Zn, 0.2%Zr, impurity content are less than 0.02%, and all the other are Mg.The melting technology of alloy is: according to mentioned component configuration alloy, add pure magnesium 146Kg in the resistance crucible furnace, adopt CO simultaneously
2+ 0.2%SF
6Mixed gas protected; after treating that magnesium melts fully; add industrial-purity zinc 0.8Kg at 660 ℃; Mg-25Y master alloy 51.3Kg adds Mg-30Zr master alloy 5Kg at 760 ℃, is incubated after 2～3 minutes and stirs; be warming up to 780 ℃ and under this temperature the insulation 10 minutes; temperature is reduced to 750～760 ℃ again and carries out refining, be incubated afterwards about 30 minutes, be cooled to 720 ℃ and carry out gravity casting or be cooled to 705 ℃ carrying out die casting or carrying out extrusion casting at 700 ℃.
Alloy at room temperature tensile strength under this example gravity casting condition is that 209MPa, yield strength are that 98MPa, unit elongation are 21%; Tensile strength under 200 ℃ is that 165MPa, yield strength are that 87MPa, unit elongation are 28%; At 200 ℃, under the 60MPa condition, 100 hours creep compliance is 0.065%.And the alloy at room temperature tensile strength of die casting is 243.4MPa, yield strength is that 152.7MPa, unit elongation are 12.8%; Tensile strength under 200 ℃ is that 213.6MPa, yield strength are that 138MPa, unit elongation are 20.2%; At 200 ℃, under the 60MPa condition, 100 hours creep compliance is 0.05%, and at 200 ℃, under the 80MPa condition, 100 hours creep compliance is 0.07%.
Claims (7)
1, a kind of heat resistance casting magnesium alloy is characterized in that, composition that comprises and weight percent thereof are: 1.5-4.5%Y, and 0.4-1.5%Zn, 0.2-0.7%Zr, impurity element Fe＜0.005%, Cu＜0.015%, Ni＜0.002%, all the other are Mg.
2, heat resistance casting magnesium alloy according to claim 1 is characterized in that, composition that comprises and weight percent thereof are: 1.5%Y, 1.5%Zn, 0.7%Zr, impurity content are less than 0.02%, and all the other are Mg.
3, heat resistance casting magnesium alloy according to claim 1 is characterized in that, composition that comprises and weight percent thereof are: 3%Y, 0.8%Zn, 0.45%Zr, impurity content are less than 0.02%, and all the other are Mg.
4, heat resistance casting magnesium alloy according to claim 1 is characterized in that, composition that comprises and weight percent thereof are: 4.5%Y, 0.4%Zn, 0.2%Zr, impurity content are less than 0.02%, and all the other are Mg.
5, casting heat-resistant magnesium alloy preparation method according to claim 1 is characterized in that, comprises the steps:
The first step, than calculating the weight percent that raw material needs, raw material is according to each set of dispense: the massfraction of Mg content is greater than 99.9% magnesium ingot, industrial-purity zinc, Mg-Y master alloy, Mg-Zr master alloy;
Second the step, the melting technology of alloy is as follows: with pure magnesium at CO
2+ 0.2%SF
6The protection of mixed gas is heating down; after treating that pure magnesium melts fully; add industrial-purity zinc at 660-680 ℃; in the time of 720～740 ℃, add Mg-Y master alloy; add Mg-Zr master alloy at 760-770 ℃; be incubated after 2-3 minute and stir; be warming up to again 780-790 ℃ and under this temperature the insulation about 10 minutes; then with temperature regulation to 750-760 ℃ of refining, and be cooled to 720～740 ℃ after being incubated 30 minutes and carry out gravitational casting or be cooled to 695-715 ℃ carrying out die casting or 700 ℃ and carrying out extrusion casting.
6, casting heat-resistant magnesium alloy preparation method according to claim 5, it is characterized in that, described heat resistance casting magnesium alloy is under the gravitational casting condition, its room temperature tensile strength surpasses 200MPa, yield strength surpasses 90MPa, unit elongation above 20%, at 200 ℃, under the 60MPa condition, 100 hours creep compliance is all less than 0.1%.
7, casting heat-resistant magnesium alloy preparation method according to claim 5, it is characterized in that, described heat resistance casting magnesium alloy is under die casting or extrusion casting condition, its room temperature tensile strength all surpasses 130MPa, unit elongation above 10% above 220MPa, yield strength, at 200 ℃, under the 70MPa condition, 100 hours creep compliance is all less than 0.1%.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101812620A (en) * | 2010-04-30 | 2010-08-25 | 重庆大学 | magnesium-zinc-zirconium-yttrium-magnesium alloy |
| CN101560622B (en) * | 2009-05-21 | 2011-06-08 | 上海交通大学 | Method for enhancing Mg97Y2Zn1 alloy by adding zirconium |
| CN102268579A (en) * | 2011-08-02 | 2011-12-07 | 佳木斯大学 | Preparation process of heat-resistant Mg-Sr-Zn-Y alloy |
| CN102304656A (en) * | 2011-09-02 | 2012-01-04 | 吴落义 | Rare earth heat resistant magnesium alloy with high corrosion resistance |
| EP2426228A1 (en) * | 2010-09-03 | 2012-03-07 | Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH | Magnesium sheet semi-finished products with improved cold reforming characteristics |
| CN104328320A (en) * | 2014-11-28 | 2015-02-04 | 重庆市科学技术研究院 | High-strength and high-plasticity magnesium alloy |
| CN104451314A (en) * | 2014-12-19 | 2015-03-25 | 郑州轻工业学院 | High-strength heat-resistant cast magnesium alloy and preparation method thereof |
| CN104454390A (en) * | 2014-12-20 | 2015-03-25 | 常熟市强盛电力设备有限责任公司 | Wind turbine generator unit cabin base |
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| CN104532092A (en) * | 2014-12-13 | 2015-04-22 | 重庆大学 | Electromagnetic shielding magnesium alloy material and preparation method thereof |
| CN105525178A (en) * | 2014-10-22 | 2016-04-27 | 上海交通大学深圳研究院 | High-thermal-conductivity die-castable Mg-Y-Zr series multielement magnesium alloy and preparation method thereof |
| CN106000700A (en) * | 2016-05-30 | 2016-10-12 | 上海治实合金科技有限公司 | Static rotary cup shell for automatic automobile spraying production line |
| CN106191595A (en) * | 2015-05-27 | 2016-12-07 | 本田技研工业株式会社 | Thermostability magnesium casting alloy and manufacture method thereof |
| CN106591659A (en) * | 2016-12-29 | 2017-04-26 | 中国科学院长春应用化学研究所 | High-strength and high-toughness cast rare earth magnesium alloy and preparation method thereof |
| CN107354357A (en) * | 2017-06-28 | 2017-11-17 | 中国科学院长春应用化学研究所 | A kind of wrought magnesium alloy and preparation method thereof |
| CN107354355A (en) * | 2017-06-28 | 2017-11-17 | 中国科学院长春应用化学研究所 | A kind of cast magnesium alloy and preparation method thereof |
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2008
- 2008-10-23 CN CNA2008102016085A patent/CN101381833A/en active Pending
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101560622B (en) * | 2009-05-21 | 2011-06-08 | 上海交通大学 | Method for enhancing Mg97Y2Zn1 alloy by adding zirconium |
| CN101812620A (en) * | 2010-04-30 | 2010-08-25 | 重庆大学 | magnesium-zinc-zirconium-yttrium-magnesium alloy |
| EP2426228A1 (en) * | 2010-09-03 | 2012-03-07 | Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH | Magnesium sheet semi-finished products with improved cold reforming characteristics |
| CN102268579A (en) * | 2011-08-02 | 2011-12-07 | 佳木斯大学 | Preparation process of heat-resistant Mg-Sr-Zn-Y alloy |
| CN102268579B (en) * | 2011-08-02 | 2013-04-10 | 佳木斯大学 | Preparation process of heat-resistant Mg-Sr-Zn-Y alloy |
| CN102304656A (en) * | 2011-09-02 | 2012-01-04 | 吴落义 | Rare earth heat resistant magnesium alloy with high corrosion resistance |
| CN105525178A (en) * | 2014-10-22 | 2016-04-27 | 上海交通大学深圳研究院 | High-thermal-conductivity die-castable Mg-Y-Zr series multielement magnesium alloy and preparation method thereof |
| CN104328320A (en) * | 2014-11-28 | 2015-02-04 | 重庆市科学技术研究院 | High-strength and high-plasticity magnesium alloy |
| CN104532092A (en) * | 2014-12-13 | 2015-04-22 | 重庆大学 | Electromagnetic shielding magnesium alloy material and preparation method thereof |
| CN104451314A (en) * | 2014-12-19 | 2015-03-25 | 郑州轻工业学院 | High-strength heat-resistant cast magnesium alloy and preparation method thereof |
| CN104451314B (en) * | 2014-12-19 | 2016-05-25 | 郑州轻工业学院 | A kind of high-strength temperature-resistant cast magnesium alloy and preparation method |
| CN104454389A (en) * | 2014-12-20 | 2015-03-25 | 常熟市强盛电力设备有限责任公司 | Direct-driven rotor for wind driven generator |
| CN104454390A (en) * | 2014-12-20 | 2015-03-25 | 常熟市强盛电力设备有限责任公司 | Wind turbine generator unit cabin base |
| CN106191595A (en) * | 2015-05-27 | 2016-12-07 | 本田技研工业株式会社 | Thermostability magnesium casting alloy and manufacture method thereof |
| CN106191595B (en) * | 2015-05-27 | 2018-09-07 | 本田技研工业株式会社 | Heat resistance magnesium casting alloy and its manufacturing method |
| CN106000700A (en) * | 2016-05-30 | 2016-10-12 | 上海治实合金科技有限公司 | Static rotary cup shell for automatic automobile spraying production line |
| CN106591659A (en) * | 2016-12-29 | 2017-04-26 | 中国科学院长春应用化学研究所 | High-strength and high-toughness cast rare earth magnesium alloy and preparation method thereof |
| CN107354357A (en) * | 2017-06-28 | 2017-11-17 | 中国科学院长春应用化学研究所 | A kind of wrought magnesium alloy and preparation method thereof |
| CN107354355A (en) * | 2017-06-28 | 2017-11-17 | 中国科学院长春应用化学研究所 | A kind of cast magnesium alloy and preparation method thereof |
| CN107354357B (en) * | 2017-06-28 | 2019-10-25 | 中国科学院长春应用化学研究所 | A kind of wrought magnesium alloy and preparation method thereof |
| CN107354355B (en) * | 2017-06-28 | 2019-12-27 | 中国科学院长春应用化学研究所 | Cast magnesium alloy and preparation method thereof |
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