Inhomogeneity of density and mechanical properties of A357 aluminum alloy backward extruded in semi-solid state

作     者：杜之明 陈刚 程远胜 谢水生 DU Zhi-ming;CHEN Gang;CHENG Yuan-sheng;XIE Shui-sheng

作者机构：哈尔滨工业大学材料科学与工程学院哈尔滨150001 北京有色金属研究总院有色金属制造与加工国家重点实验室北京100088 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2011年第21卷第10期

页      面：2285-2293页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Projects(50774026,50875059)supported by the National Natural Science Foundation of China Project(20070420023)supported by the China Postdoctoral Science Foundation Project(2008AA03A239)supported by the High-tech Research and Development Program of China 

主　　题：A357 aluminum alloy inhomogeneity semi-solid state backward extrusion numerical simulation 

摘      要：The inhomogeneity of density and mechanical properties of A357 aluminum alloy in the semi-solid state were *** simulation and backward extrusion were adopted to study the preparation of cup *** results show that the relative density of the wall is the lowest in samples,and that of the base is the *** increasing the billet height,more time is needed for relative density of the corner to reach the maximum value,and the relative densities in every region improve evidently with increasing the *** tensile stress was simulated to be the largest at the corner,and the hot tearings were forecasted to mainly appear at the corner *** employing proper billet height and pressure,the extruded samples consisted of fine and uniform microstructures,and can obtain excellent mechanical properties and Brinell hardness.