摘要
采用数值模拟和组织分析的方法研究了再结晶重熔法制备的半固态7075铝合金的径向挤压过程,分析了成形过程中径向流动速度场、挤出试样中应力场及行程分布载荷,并对挤出试样不同部位的组织进行了观察。结果表明,径向挤压过程中半固态金属优先充填大截面径向型腔,最大应力集中区由径向流动转折处逐渐向周围扩展,径向流动及应力集中的结果造成流动转折处组织中固相颗粒拉长现象严重。
The lateral extrusion process of semi-solid 7075 aluminum alloy prepared by recrystallization and partial remelting method was investigated by numerical simulation and microstructure analysis.The velocity field of lateral flow,stress field in extrusion sample and the load-stroke curve in the extrusion process were analyzed.Meanwhile,the microstructure at different position of sample after extrusion was also observed.The results show that the semi-solid metal preferentially fills into the cavity with the bigger cross section in the lateral extrusion process,and the maximum stress concentration zone is gradually extended from turning zones of flow direction forward surrounding region.The lateral extrusion and stress concentration lead to the serious elongated grains in the microstructure of turning zones of flow direction.
作者
林方成
刘洪军
韩龙
Lin Fangcheng, Liu Hongjun, Han Long(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technolog)
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2018年第5期487-490,共4页
Special Casting & Nonferrous Alloys
基金
甘肃省自然科学基金资助项目(145RJZA082)
关键词
7075铝合金
半固态挤压
径向流动
数值模拟
7075 Aluminum Alloy
Semi-solid Extrusion
Lateral Flow
Numerical Simulation
