(湖南大学 材料科学与工程学院，长沙 410082)
摘 要: 采用Deform-2D有限元软件对喷射沉积7075/SiCp铝基复合材料挤压变形进行数值模拟。模拟采用的挤压变形条件为：挤压比4~100，锭坯预热温度300~450 ℃，挤压杆速度2~20 mm/s。结果表明：在挤压变形区内应力及温度变化剧烈，且在模子入口处均出现最大值；挤压比和挤压速度越大，应力越大，温度效应也越显著。喷射沉积7075/SiCp铝基复合材料最佳挤压条件为：锭坯预热温度350~400 ℃、挤压比16~50、挤压杆速度5~15 mm/s。数值模拟结果和工艺实验测量值吻合较好。
关键字: 7075Al/SiCp复合材料；喷射沉积；挤压；刚塑性有限元；数值模拟
（College of Materials Science and Engineering, Hunan University,Changsha 410082, China）
Abstract:The extrusion deformation of spray-deposited 7075Al/SiCp composite was simulated by using rigid-plastic finite element method (FEM) on DEFORM-2D soft word. The condition of numerical simulation on extrusion deformation is that the extrusion ratio is 4−100, preheating temperature of billet is 300−450 ℃ and extrusion ram speed is 2−20 mm/s. The results indicate that the maximum stress and temperature occur in the die entry section. The stress and temperature effect increase with increasing extrusion ratio and ram speed. The optimal processing parameters for the extrusion of 7075Al/SiCp composite are obtained as follows: the billet preheating temperature of 350−400 ℃, extrusion ratio of 16−50 and extrusion ram speed of 5−15 mm/s. The numerical simulation results agree well with experimental ones.
Key words: 7075Al/SiCp composite; spray-deposition; extrusion; rigid-plastic FEM; numerical simulation
