电磁搅拌辅助流变挤压铸造Mg-6Gd-3Y镁合金的显微组织和力学性能  

Microstructure and mechanical properties of rheo-squeeze casting Mg-6Gd-3Y alloy by electromagnetic stirring

作　　者：张泉达 黄玉川 孙福臻 庞松 李蕙宇 刘文才[3] ZHANG Quan-da;HUANG Yu-chuan;SUN Fu-zhen;PANG Song;LI Hui-yu;LIU Wen-cai(State Key Laboratory of Advanced Forming Technology and Equipment,China Academy of Machinery Science and Technology Group Co.,Ltd.,Beijing 100083,China;Beijing National Innovation Institute of Lightweight Ltd.,Beijing 100083,China;National Engineering Research Center of Light Alloy Net Forming,School of Materials science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Aerospace Precision Machinery Research Institute,Shanghai 201600,China)

机构地区：[1]中国机械科学研究总院集团有限公司先进成形技术与装备国家重点实验室,北京100083 [2]北京机科国创轻量化科学研究院有限公司,北京100083 [3]上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心,上海200240 [4]上海航天精密机械研究所,上海201600

出　　处：《中国有色金属学报》2023年第7期2043-2055,共13页The Chinese Journal of Nonferrous Metals

基　　金：先进成形技术与装备国家重点实验室开放基金资助项目(SKL2020005);上海航天技术研究院−上海交通大学航天先进技术联合研究中心资助项目(USCAST2020-14)。

摘　　要：通过电磁搅拌制备了Mg-6Gd-3Y(VW63)稀土镁合金半固态浆料,研究了电磁搅拌工艺参数对合金半固态浆料组织的影响,探讨了半固态浆料初生相的形成机理;并对半固态浆料进行了流变挤压铸造成形,研究了压力对流变挤压铸造合金组织和性能的影响。结果表明:电磁搅拌制备VW63合金半固态浆料的最佳工艺参数为浇注温度620℃、搅拌电压350 V、搅拌频率15 Hz,VW63合金半固态浆料的初生相形成机理为枝晶熔断。当压力为120 MPa时,流变挤压铸造合金有着更好的组织与性能,平均晶粒尺寸43.57μm,其屈服强度、抗拉强度和伸长率分别为119 MPa、156 MPa和6.9%,均优于重力铸造和液态挤压铸造合金。Mg-6Gd-3Y(VW63)alloy semi-solid slurry was prepared by the electromagnetic stirring.The effects of electromagnetic stirring process parameters on the microstructure of VW63 alloy semi-solid slurry were studied,and the formation mechanism of primary phase of semi-solid slurry was discussed.The semi-solid slurry was formed by rheological squeeze casting,and the effects of pressure on the microstructure and properties of rheo-squeeze casting alloy were studied.The results show that the optimal process parameters for the preparation of VW63 alloy semi-solid slurry by the electromagnetic stirring are pouring temperature of 620℃,stirring voltage of 350 V and stirring frequency of 15 Hz.The formation mechanism of primary phase of VW63 alloy semi-solid slurry prepared by electromagnetic stirring is dendrite melting.When the pressure is 120 MPa,the rheo-squeeze casting VW63 alloy has better microstructure and properties,with average grain size of 43.57μm.The yield strength,ultimate tensile strength and elongation are 119 MPa,156 MPa and 6.9%,respectively,which are better than those of the gravity casting and liquid squeeze casting alloys.

关 键 词：电磁搅拌 半固态浆料 流变挤压铸造 Mg-6Gd-3Y合金 

分 类 号：TG249.2[金属学及工艺—铸造] TG146.22[一般工业技术—材料科学与工程]