半固态7075铝合金径向挤压过程分析

林方成; 刘洪军; 韩龙

doi:10.15980/j.tzzz.2018.05.006

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半固态7075铝合金径向挤压过程分析
Analysis of Lateral Extrusion Process of Semi-solid 7075 Aluminum Alloy
2018年38卷第5期页码：487-490
纸质出版日期： 2018 ，
DOI： 10.15980/j.tzzz.2018.05.006

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[1]林方成,刘洪军,韩龙.半固态7075铝合金径向挤压过程分析[J].特种铸造及有色合金,2018,38(05):487-490.

Lin Fangcheng, Liu Hongjun, Han Long. Analysis of Lateral Extrusion Process of Semi-solid 7075 Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2018,38(5):487-490.
[1]林方成,刘洪军,韩龙.半固态7075铝合金径向挤压过程分析[J].特种铸造及有色合金,2018,38(05):487-490. DOI： 10.15980/j.tzzz.2018.05.006.

Lin Fangcheng, Liu Hongjun, Han Long. Analysis of Lateral Extrusion Process of Semi-solid 7075 Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2018,38(5):487-490. DOI： 10.15980/j.tzzz.2018.05.006.

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。

Abstract

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.