RESEARCH ON ALLOYING TECNIQUES OF MISCHMETAL IN DIE CASTING MAGNESIUM ALLOY
An aim of the experiments is to study alloying techniques of dollop-like MM, as-cast and extruded Mg-MM master alloy in die casting AZ91D magnesium alloy at conventional cold chamber die casting temperature. The as-cast AZ91D-1.2wt％MM alloys were prepared and MM was added by different way at 720℃. The results showed that the efficiency of alloying achieved less than 50％ within 30 min when dollop-like MM was added. When MM was added by as-cast and extruded Mg-21wt％MM master alloy, the efficiency of alloying was improved significantly. The microstructure and analytical studies were carried out using optical microscopy and differential scanning calrimetry (DSC). Testing results showed the Mg-MM master alloy could melt easily down at die casting temperature because Mg-RE phases with lower melting point were formed. The grain refining efficiency of the master alloy was improved by extrusion. The improvement could be attributed to the decrease in Mg-RE particle size and increase in the number of nucleating sizes for Mg. Then die-casting AZ91D-0.44wt％MM test bars were produced with addition of extruded Mg-21wt％MM master alloy and the efficiency of alloying was around 80％.
Magnesium alloy rare earth die casting alloying technique
YULEI XU KUI ZHANG XINGGANG LI KANG ZHANG JIAN LEI HAIBO YUAN
Slate Key Laboratory for Fabrication and Processing of Nonferrous Metals, General Research Institute Dongfeng Motor Co., LTD Material Technology Institute of CVTC, Shiyan, 442001, Peoples Republic of
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
832-837
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）