铝锌镁铜锆钪合金型材的组织和性能
Microstructure and Properties of a Al-Zn-Mg-Cu-Zr-Sc Alloy Profile
摘 要
采用光学显微镜、扫描电镜、电子背散射衍射仪、透射电镜及拉伸试验机等手段, 研究了新型铝锌镁铜锆钪合金经挤压变形及双级时效处理后型材的组织和性能。结果表明: 该合金型材双级时效后的抗拉强度为540 MPa, 屈服强度为507 MPa, 伸长率为11.1%, 电导率为41.7%IACS; 添加微量元素钪后, 合金型材在伸长率和电导率相当的情况下, 抗拉强度和屈服强度分别提高了4.5%和4.7%; 钪主要以Al3(Sc,Zr)相形式存在, Al3(Sc,Zr)相可以显著细化合金的晶粒和阻碍合金的回复再结晶行为, 并且有效抑制晶界无析出带的出现和晶界沉淀相的粗化; 另外, 在合金中发现了由铝、铜和钪三种元素形成的W相。
钪
Al3(Sc,Zr)相
显微组织
性能
Al-Zn-Mg-Cu-Zr alloy
Sc
Al3(Sc,Zr) phase
microstructure
property
Abstract
The microstructure and properties of a new Al-Zn-Mg-Cu-Zr-Sc alloy profile after extruding and two-step aging were studied using optical microscopy (OM), scanning electron microscopy (SEM), electronic back-scattered diffraction technique (EBSD), transmission electron microscopy (TEM) and tensile test. The results show that after two-step aging treatment, the tensile strength, yield strength, elongation and electrical conductivity of the alloy were 540 MPa, 507 MPa, 11.1% and 41.7 %IACS, respectively. With the minor addition of Sc, the tensile strength and yield strength increased by 4.5% and 4.7%, and the elongation and electrical conductivity almost didn′t change. Scandium existed as Al3(Sc,Zr) phase which can refine grain size of the alloy, effectively restrain the recrystallization behavior and the appearance of precipitate free zones along grain boundaries and coarsing of precipitates on the grain boundaries. In addition, a ternary W phase composed of elements Al, Cu and Sc was observed in the alloy.
中图分类号 TG146.2
所属栏目 材料性能及其应用
基金项目
收稿日期 2013/8/13
修改稿日期 2014/4/2
网络出版日期
作者单位点击查看
备注王少华(1983-), 男, 辽宁抚顺人, 工程师, 博士。
引用该论文: WANG Shao-hua,MA Zhi-feng,LIU Hui,ZHANG Xian-feng,SUN Gang,FENG Zhao-hui,LI Wei,LU Zheng. Microstructure and Properties of a Al-Zn-Mg-Cu-Zr-Sc Alloy Profile[J]. Materials for mechancial engineering, 2014, 38(6): 60～65
王少华,马志锋,刘惠,张显峰,孙刚,冯朝辉,李伟,陆政. 铝锌镁铜锆钪合金型材的组织和性能[J]. 机械工程材料, 2014, 38(6): 60～65
被引情况:
【1】高莹,张显峰,王少华,刘惠, "新型铝锌镁铜系高强韧铝合金型材的双级时效工艺",机械工程材料 40, 61-65(2016)
【2】李 慧,陈 涛,赵路远,黄 俊,吴玉程, "T651态7075铝合金的显微组织与拉伸断裂机制",机械工程材料 40, 38-43(2016)
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【2】冯朝辉, 王少华, 胡兴华, 等.第二级时效工艺对7050铝合金厚板组织及性能的影响［J］.机械工程材料, 2011,35(5):35-38.
【3】王胜强, 王少华, 马志峰, 等.一种新型Al-Zn-Mg-Cu-Zr合金的变形行为研究 ［J］.材料工程,2012,6(3):453-456.
【4】LUKASAK D A, HART R M. Aluminum alloy development efforts for compression dominated structure of aircraft ［J］.Light Metal Age,1991,2(9):11-15.
【5】张君尧.航空结构用高纯高韧性铝合金的进展［J］.轻金属,1994(6):54-58.
【6】SENKOV O N, SHAGIEV M R, SENKOVA S V. Precipitation of Al3(Sc,Zr) particles in an Al-Zn-Mg-Cu-Sc-Zr alloy during conventional solution heat treatment and its effect on tensile properties［J］.Acta Materialia,2008,56(15):3723-3738.
【7】SENKOV O N, BHAT R B, SENKOVA S V, et al. Microstructure and properties of cast ingots of Al-Zn-Mg-Cu alloysmodified with Sc and Zr［J］.Metallurgical and Materials Tran- sactions: A, 2005,36 (8):2115-2126.
【8】戴晓元,夏长清,刘昌斌.钪对Al-Zn-Mg-Cu-Zr合金组织性能的影响［J］.稀有金属材料与工程,2006,35(6):913-916.
【9】SHARMA M M, AMATEAU M F, EDEN T J. Hardening mechanisms of spray formed Al-Zn-Mg-Cu alloys with scandium and other elemental additions［J］.Journal of Alloys and Compounds, 2006,416(1/2):135-142.
【10】戴晓元,罗要菊,寇丽丽,等. AI-9.0Zn-2.5Mg-2.5Cu-0.15Zr-0.2Sc合金中A13(Sc, Zr)粒子的析出行为［J］.材料热处理学报,2012,33(增):61-66.
【11】MENG Y, ZHAO Z H, CUI J Z. Effect of minor Zr and Sc on microstructures and mechanical properties of Al-Mg-Si-Cu-Cr-V alloys ［J］.Transactions of Nonferrous Metals Society of China, 2013,23: 1882-1889.
【12】LI Y T, LIU Z Y, XIA Q K, et al. Grain refinement of the Al-Cu-Mg-Ag alloy with Er and Sc additions［J］.Metallurgical and Materials Transactions:A, 2007,38(11): 2853-2858.
【13】ROKHLIN L L, DOBATKINA T V, BOCHVAR N R, et al. Investigation of phase equilibria in alloys of the Al-Zn-Mg-Cu-Zr-Sc system［J］.Journal of Alloys and Compounds, 2004,367 (1/2):10-16.
【14】HANSEE L, GJONNES J. Hrtem study and structure modeling of the η′ phase, the harding precipitation in commercial Al-Zn-Mg alloy ［J］.Acta Materialia, 1999,47: 2651-2659.
【15】STILLER K, WARREN P J, HANSEN V, et al. Investigation of precipitation in an Al-Zn-Mg alloy after two-step ageing treatment at 100 ℃and 150 ℃ ［J］.Materials Science and Engineering: A,1999,270(1):55-63.
【16】戴晓元,夏长清,刘昌斌.微量钪对Al-Zn-Mg-Cu-Zr铝合金组织与性能的影响［J］.矿冶工程,2004,24(3):59-61.
【17】胡赓祥, 蔡珣. 材料科学基础［M］.上海:上海交通大学出版社,2004.
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