Friction Stir Processing of Thixoformed AZ91D Magnesium Alloy and Fabrication of Surface Composite Reinforced by SiC_ps  

作　　者：陈体军 

机构地区：[1]State Key Laboratory of Gansu Advanced Nonferrous Materials, Lanzhou University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2010年第2期223-227,共5页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the State Key Development Program for Basic Research of China (2007CB613706);the Natural Science Foundation of Gansu Province(3ZS042-B25-003);the Development Program for Outstanding Young Teachers in Lanzhou university of Technology (SKL03004)

摘　　要：The microstructural evolution characteristics of the thermomechanically affected zone （TMAZ） alloy during friction stir processing （FSP） of thixoformed （TF） AZ91D alloy were investigated. Simultaneously, a surface composite layer reinforced by SiC particles （SiCps） was prepared on the alloy by FSP and the corresponding tribological properties were examined. The experimental results indicate that dynamic recrystallization and mechanical separation （including splitting and fracture of the primary grains） are the main mechanisms of grain refinement for the TMAZ. A composite surface reinforced by uniformly distributed SiCps was prepared on the alloy. Compared with the corresponding permanent mould casting alloy and the TF alloy without composite surface, the TF alloy with composite surface has the highest wear resistance and lowest friction coefficient.The microstructural evolution characteristics of the thermomechanically affected zone （TMAZ） alloy during friction stir processing （FSP） of thixoformed （TF） AZ91D alloy were investigated. Simultaneously, a surface composite layer reinforced by SiC particles （SiCps） was prepared on the alloy by FSP and the corresponding tribological properties were examined. The experimental results indicate that dynamic recrystallization and mechanical separation （including splitting and fracture of the primary grains） are the main mechanisms of grain refinement for the TMAZ. A composite surface reinforced by uniformly distributed SiCps was prepared on the alloy. Compared with the corresponding permanent mould casting alloy and the TF alloy without composite surface, the TF alloy with composite surface has the highest wear resistance and lowest friction coefficient.

关 键 词：friction stir processing THIXOFORMING AZ91D alloy microstructure evolution composite surface tribological properties 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TB333[金属学及工艺—金属材料]