Deformation mechanism of the spray formed 70Si30Al alloy during hot compression  

作　　者：WEI Yanguang XIONG Baiqing ZHANG Yong＇an LIU Hongwei WANG Feng ZHU Baohong 

机构地区：[1]State Key Laboratory for Fabrication ＆ Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China

出　　处：《Rare Metals》2007年第1期56-61,共6页稀有金属（英文版）

基　　金：This study was financially supported by the National Basic Research Program of China (No. G20000672).

摘　　要：The deformation mechanism of the spray formed 70Si30Al alloy was studied by hot compression on a Gleeble-1500 test machine. It is shown that hot deformation of the spray formed 70Si30Al alloy is achieved by liquid flow due to isostatic pressure and movement of solid particles due to shear force. Deformation condition depends on the nucleation rate and closure rate of the cavities. The flow stress slightly varies when the difference between the nucleation rate and closure rate of the cavities is small; however, it decreases when the nucleation rate of the cavities is greater than the closure rate of the cavities.The deformation mechanism of the spray formed 70Si30Al alloy was studied by hot compression on a Gleeble-1500 test machine. It is shown that hot deformation of the spray formed 70Si30Al alloy is achieved by liquid flow due to isostatic pressure and movement of solid particles due to shear force. Deformation condition depends on the nucleation rate and closure rate of the cavities. The flow stress slightly varies when the difference between the nucleation rate and closure rate of the cavities is small; however, it decreases when the nucleation rate of the cavities is greater than the closure rate of the cavities.

关 键 词：70Si30Al alloy spray forming hot compression deformation mechanism 

分 类 号：TG146.21[一般工业技术—材料科学与工程]