6061铝合金的等温凝固组织及第二相的析出顺序  

Isothermal Solidification Microstructure and Second Phases Precipitation Sequence of the 6061 Aluminum Alloy

作　　者：孟凡博 黄宏军[1] 林雪健 崔泽文 胡贤磊[3] 袁晓光[1] Meng Fanbo;Huang Hongjun;Lin Xuejian;Cui Zewen;Hu Xianlei;Yuan Xiaoguang(School of Materials Science and Engineering,Shenyang University of Technology;Harvard Technology Center,Great Wall Motors Co.,Ltd.;State Key Laboratory of Rolling and Automation,Northeastern University)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]长城汽车有限公司哈弗技术中心 [3]东北大学轧制技术及连轧自动化国家重点实验室

出　　处：《特种铸造及有色合金》2020年第5期498-501,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51875365)。

摘　　要：制备了不同等温温度时6061铝合金凝固试样,利用扫描电镜观察了试样的微观组织,利用能谱分析仪测试了等温凝固组织中相的成分,利用X射线衍射仪测试了等温凝固试样中的相组成。结果表明,6061铝合金从900~650℃等温凝固时相的析出顺序为:L→α-Al+Al4Cu9+CrMn3+Cu16Mg6Si7+Mn5Si3→Cr3Si→Cu2Mg→FeCr+Cu16Mg6Si→富Fe相→Al7Cu3Mg6+Mg2Si+α-AlFeSi;6061铝合金常见的有害富Fe相是在温度低于700℃时形成的;6061铝合金等温凝固时析出的第二相主要聚集在晶界处。The isothermal solidification samples of 6061 aluminum alloy at different temperatures were prepared. The isothermal solidification microstructure of the samples was observed by metallographic microscope, and the composition of different phases in the isothermal solidification structure was measured by SEM and EDS, and the types of different phases in the isothermal solidification samples were measured by X-ray diffractometer. The results show that the precipitation sequence of 6061 aluminum alloy during solidification is presented as follows: L→α-Al+Al4Cu9+CrMn3+Cu16Mg6Si7+Mn5Si3→Cr3Si→Cu2Mg→FeCr+Cu16Mg6Si→iron-rich phase→Al7Cu3Mg6+Mg2Si+α-AlFeSi. The harmful iron-rich phase in 6061 aluminum alloy during application is generated when the temperature is lower than 700 ℃. The second phase precipitated during solidification is mainly segregated at the grain boundary.

关 键 词：6061铝合金 等温凝固 第二相 晶界 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG316[金属学及工艺—金属材料]