Ultra-Fine Grain Formation in Magnesium Alloy during Multidirectional Forging
Strain-induced grain refinement in a magnesium alloy AZ31 was studied in multidirectional and interrupted compression at a temperature range from 423K to 623K and at a strain rate of 3×10<-3>s<-1>. Multidirectional forging (MDF) with a pass strain of 0.8 was carried to high cumulative strains with changing of the loading direction during decreasing temperature from pass to pass. The structural changes can be characterized by the evolution of many mutually crossing kink bands at low strains followed by increase in their number and misorientation, finally resulting in fully formation of fine grains at high strains. MDF with decreasing temperature can accelerate the evolution of much finer grains and the improvement of plastic workability. It is concluded that grain refinement under MDF conditions occurs by a series of deformation-induced continuous reactions; that is essentially similar to in-situ or continuous dynamic recrystallization (cDRX).
magnesium alloy hot deformation new grain evolution kink band fragmentation continuous dynamic recrystallization texture development
Xuyue Yang Jie Xing Hiromi Miura Taku Sakai
Department of Mechanical Engineering and Intelligent Systems UEC Tokyo (University of Electro-Communications) Chofu, Tokyo 182-8585, Japan
国际会议
2006现代科技国际研讨会(The International Workshop on Modern Science and Technology in 2006)
北京
英文
436-439
2006-04-01（万方平台首次上网日期，不代表论文的发表时间）