| Influence of Ca addition on valence electron structure of Mg_(17)Al_(12) |
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| 作者姓名： | 杜温文 孙扬善 闵学刚 薛烽 武登云 |
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| 作者单位： | Department of Materials Science and Engineering，Department of Materials Science and Engineering，Department of Materials Science and Engineering，Department of Materials Science and Engineering，Department of Materials Science and Engineering Southeast University，Nanjing 210096，China，Southeast University，Nanjing 210096，China，Southeast University，Nanjing 210096，China，Southeast University，Nanjing 210096，China，Southeast University，Nanjing 210096，China |
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| 基金项目： | Project (2 0 0 1AA3 3 10 3 001)supportedbyHi techResearchandDevelopmentProgramofChina,project (BK2 0 0 14 0 3)supportedbytheNaturalScienceFoundationofJiangsuProvince,China |
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| 摘 要： | 1 INTRODUCTIONMagnesiumalloyshaveemergedaspotentiallygoodcandidatesfornumerousapplications ,especiallyinautomotive ,aerospaceandelectronicindustry .Theirgoodproperties ,suchaslowdensity ,highspe cificstrengthandgooddampingcapacity ,makethemthepromisingreplacementsforotherstructuralmate rials,forinstance ,steel,castiron ,andevenalu minum1,2 ] .Thewidelyusedmagnesiumalloysbe longtoMg Al Zn (AZ)series ,suchasAZ91(Mg 9Al 1Zn) ,whichhaveexcellentcastability ,goodroomtemperaturemechanicalp…
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Influence of Ca addition on valence electron structure of Mg17Al12 |
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| DU Wen-wen,SUN Yang-shan,MIN Xue-gang,XUE Feng,WU Deng-yun.Influence of Ca addition on valence electron structure of Mg_(17)Al_(12)[J].Transactions of Nonferrous Metals Society of China,2003,13(6). |
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| Authors: | DU Wen-wen SUN Yang-shan MIN Xue-gang XUE Feng WU Deng-yun |
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| Abstract: | The alloy AZ91 containing calcium was prepared under protection of a mixed gas atmosphere of SF_6 (1%, volume fraction) and CO_2. The added calcium mainly dissolves into the Mg_(17)Al_(12) phase in the alloy and increases its melting point and the thermal stability. The empirical electron theory (EET) of solid and molecules was used to calculate the valence electron structures (VES) of Mg_(17)Al_(12) phase with different amounts of calcium additions. The theoretical calculations indicate that calcium dissolved in Mg_(17)Al_(12) phase increases the strengths of atomic bonds that control the thermal stability of Mg_(17)Al_(12) phase, and also makes the distribution of valence electrons on the dominant bond network as well as in the whole unit cell of Mg_(17)Al_(12) more uniform, which are consistent with the experimental results. |
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| Keywords: | magnesium alloy Mg_(17)Al_(12) calcium valence electron structure |
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