| Microstructures and mechanical properties of Al-Mg and Al-Zn-Mg based alloys containing minor scandium and zirconium |
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| 作者姓名： | 尹志民 姜锋 潘青林 郭飞跃 朱大鹏 宋练鹏 曾渝 王涛 |
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| 作者单位： | School of Materials Science and Engineering，School of Materials Science and Engineering，School of Materials Science and Engineering，School of Materials Science and Engineering，School of Materials Science and Engineering，School of Materials Science and Engineering，School of Materials Science and Engineering，School of Materials Science and Engineering Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China，Central South University，Changsha 410083，China |
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| 基金项目： | Project (G19990 64 911)supportedbytheNationalKeyFundamentalResearchandDevelopmentProgramofChina |
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| 摘 要： | 1 INTRODUCTIONAddingofminorMn ,Cr ,Ti,B ,Zr ,Sc ,Agintoaluminumalloyscanremarkablychangethemi crostructuresandpropertiesofaluminumalloys18] .Amongthem ,theeffectofminorScandZrhasre ceivedspecialattention .Onthe 1stInternationalScandiumConferenceheldinMoscowin 1994 ,Rus sianmetallurgistsdescribedtheapplicationprospectofaluminumalloyscontainingScinaerospace ,aviation ,warshipsandnuclearindustry ,whichhasstimulatedmanyindustrialcountries’researchinterestinthiskindofalloys .Atpresent…
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Microstructures and mechanical properties of Al-Mg and Al-Zn-Mg based alloys containing minor scandium and zirconium |
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| YIN Zhi min,JIANG Feng,PAN Qing lin,GUO Fei yue,ZHU Da peng,SONG Lian peng,ZEN Yu,WANG Tao.Microstructures and mechanical properties of Al-Mg and Al-Zn-Mg based alloys containing minor scandium and zirconium[J].Transactions of Nonferrous Metals Society of China,2003,13(3). |
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| Authors: | YIN Zhi min JIANG Feng PAN Qing lin GUO Fei yue ZHU Da peng SONG Lian peng ZEN Yu WANG Tao |
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| Abstract: | A series of Al-Mg and Al-Zn-Mg based alloys with and without Sc, Zr were prepared by ingot metallurgy. The mechanical properties and microstructures of the studied alloys under different treatment conditions were studied. In addition, the existing form and acting mechanism of minor Sc and Zr in Al-Mg and Al-Zn-Mg based alloys were analyzed and discussed. The following conclusions can be drawn. First, adding of minor Sc and Zr to those alloys can increase the strength of Al-Mg and Al-Zn-Mg based alloys by 25%, while the ductility can remain in 15% and 8%, respectively. Second, in Al-Mg and Al-Zn-Mg based alloys, minor Sc and Zr mainly exist in two forms of aluminides containing Sc and Zr, one is Al3(Sc,Zr)I precipitated from the melt during solidification, the other is Al3(Sc,Zr)Ⅱ precipitated during homogenization. The former is the most effective grain refiner for α(Al) solid solution matrix, and the latter is coherent with the matrix and can strongly pin dislocations and subboundaries, which can effectively restrain recrystallization of the alloys during hot deformation, annealing and solid solution. Third, strengthening caused by adding minor Sc and Zr to the studied alloys is mainly due to fine-grain strengthening, precipitation strengthening and substructure strengthening of Al3(Sc, Zr) caused by restraining recrystallization. |
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| Keywords: | Sc Zr aluminum alloy microstructures mechanical properties |
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