挤压比对Al-0.68Mg-0.60Si合金组织和性能的影响  

Effect of extrusion ratio on microstructure and properties of Al-0.68Mg-0.60Si alloy

作　　者：李子夫 邓运来 张臻[1,2] 孙琳 张议丹 孙泉 LI Zi-fu;DENG Yun-lai;ZHANG Zhen;SUN Lin;ZHANG Yi-dan;SUN Quan(Light Alloy Research Institute,Central South University,Changsha 410083,China;Nonferrous Metal Oriented Advanced Structural Materials andManufacturing Cooperative Innovation Center,Central South University,Changsha 410083,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China;CRRC QingdaoSifang Co.,Ltd.,Qingdao 266111,Shandong,China)

机构地区：[1]中南大学轻合金研究院,长沙410083 [2]中南大学有色金属先进结构材料与制造协同创新中心,长沙410083 [3]中南大学材料科学与工程学院,长沙410083 [4]中车青岛四方机车车辆股份有限公司,山东青岛266111

出　　处：《材料工程》2019年第10期60-67,共8页Journal of Materials Engineering

基　　金：国家重点研发计划项目(2016YFB0300901);国家重点基础研究发展计划资助项目(2012CB619500);国家自然科学基金资助项目(51375503)

摘　　要：采用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)、电子背散射衍射系统(EBSD)、透射电子显微镜(TEM)、硬度测试、室温拉伸测试等研究挤压比对Al-0.68Mg-0.60Si合金组织与性能的影响。结果表明:随着挤压比的增大,T6态Al-0.68Mg-0.60Si合金型材基体内的强化相弥散质点的尺寸逐渐减小,弥散程度增加,小角度晶界占比呈下降趋势,但再结晶分数有所提高,当挤压比达到39.6以上,合金内部基本为立方织构。此外,在挤压变形过程中,随着挤压比(λ=26.8~55.7)的增大,合金型材的硬度、抗拉强度先上升再下降;当λ=39.6时,合金的抗拉强度达到最大值284.00MPa。The effects of extrusion ratio on microstructure and properties of Al-0.68Mg-0.60Si alloy were studied by optical microscope(OM),scanning electron microscope(SEM),energy dispersive spectroscopy(EDS),electron backscatter diffraction(EBSD),transmission electron microscope(TEM),hardness test and tensile test at room temperature.The results show that with the increase of extrusion ratio,the size of the dispersed particles in the matrix of Al-0.68Mg-0.60Si alloy profile decreases gradually,the degree of dispersion increases,the fraction of small angle grain boundaries decreases,but the recrystallization fraction increases.When the extrusion ratio reaches above 39.6,the texture of the alloy is cubic texture.In addition,in the extrusion deformation process,the hardness and tensile strength of the alloy profile increase first and then decrease with the increase of extrusion ratio(λ=26.8-55.7);whenλis 39.6,the maximum tensile strength of the alloy reaches 284.00MPa.

关 键 词：挤压比 Al-0.68Mg-0.60Si合金 微观组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]