高强Al-11Zn-1.84Mg-0.92Cu-0.15Zr-0.15Sc合金流变挤压铸造组织与性能研究  

Microstructure and Mechanical Properties of Rheo-squeeze Casting of High Strength Al-11Zn-1.84Mg-0.92Cu-0.15Zr-0.15Sc Alloy

作　　者：徐永涛 赵朴睿 白月龙 张志峰[1,3,4] 杨子玥 刘彦强[1,3,4] 马恒 钱苗 何卫[6] Xu Yongtao;Zhao Puri;Bai Yuelong;Zhang Zhifeng;Yang Ziyue;Liu Yanqiang;Ma Heng;Qian Miao;He Wei(Grinm Metal Composites Technology Co.,Ltd.;Materials Science and Engineering,University of Science and Technology Beijing;National Engineering&.Technology Research Center for Nonferrous Metals Composites,China Grinm Group Co.,Ltd.;General Research Institute for Nonferrous Metals;Zhejiang Huadian Equipment Testing Institute Co.,Ltd.;Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute)

机构地区：[1]有研金属复材技术有限公司,北京100088 [2]北京科技大学材料科学与工程学院 [3]中国有研科技集团国家有色金属复合材料工程技术研究中心 [4]北京有色金属研究总院 [5]浙江华电器材检测研究院有限公司 [6]国网电力科学研究院武汉南瑞有限责任公司

出　　处：《特种铸造及有色合金》2023年第6期763-767,共5页Special Casting & Nonferrous Alloys

基　　金：国家电网公司科技指南项目(SGZJ0000KXJS2100125)。

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)、能谱分析仪(EDS)、X射线衍射分析仪(XRD)、热裂试棒试验法研究了Al-11Zn-1.84Mg-0.92Cu-0.15Zr-0.15Sc铸造铝合金的热裂敏感性能以及电磁搅拌熔体处理对合金挤压铸造件组织与力学性能的影响。研究表明,试验合金具有良好的抗热裂敏感性能,与未施加电磁搅拌熔体处理相比,电磁搅拌熔体处理的挤压铸造轨道件的晶粒细小均匀,晶界处粗大的初生Al3(Sc,Zr)相和低熔点共晶相的数量与尺寸明显减小甚至消失。经T6热处理后低熔点共晶相几乎完全回溶到基体内部,铸件的力学性能提升明显,平均抗拉强度为565 MPa,伸长率达到7.5%,同时力学性能的一致性和稳定性得到显著改善。Hot tearing sensitivity,microstructure and mechanical properties of Al-11Zn-1.84Mg-0.92Cu-0.15Zr-O.15Sc alloy by squeeze casting were investigated by OM,SEM,EDS,XRD and hot tearing rod testing method.The results indicate that the test alloy possesses desirable hot tearing resistance.After electromagnetic stirring melt treatment,the grain is refined greatly,and the amounts and size of primary Als(Sc,Zr)phases and lowmelting eutectic phases in grain boundary are significantly reduced or even disappear,and the latter ones are almost completely dissolved into the matrix after T6 heat treatment.The mechanical properties of the castings are significantly enhanced,where the average tensile strength is 565 MPa,and elongation reaches 7.25%.Meanwhile,the consistency and stability of mechanical properties are apparently improved.

关 键 词：抗热裂 低熔点共晶相 抗拉强度 伸长率 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.26[金属学及工艺—金属材料]