铸造镁合金凝固过程数值模拟研究进展

Recent Advances in Numerical Simulation of Solidification Process in Cast Magnesium Alloys

镁合金以其轻量化、高比强度和良好的阻尼性能在汽车、航空航天等领域应用广泛。数值模拟通过再现铸造成形过程中的各类宏观和微观物理过程,可以调控组织、减少缺陷、提高力学性能和优化铸造工艺参数。本文综述了铸造镁合金在枝晶和共晶凝固组织模拟,偏析、气孔和热裂等缺陷模拟,以及力学性能预测等方面的研究现状,简要介绍了近两年在铸造镁合金成形工艺模拟方面的研究进展。最后,指出了当前铸造镁合金数值模拟研究存在的问题及发展方向。

Magnesium alloys are widely used in automotive and aerospace fields due to its lightweight,high specific strength,good damping performance,etc.Numerical simulation can be used to control microstructures,reduce casting defects,improve mechanical properties,and optimize casting process parameters by reproducing various macro and micro physical processes during the casting process.In this paper,the current research situations of numerical simulations of dendritic and eutectic microstructures,the casting defects of segregation,gas hole,hot tearing and so on,and mechanical property prediction have been reviewed,and the research progress in the numerical simulation aspect of the forming process simulation of cast magnesium alloy for last two years is further briefly introduced.Finally,the existing problems and the future directions of the present researches are suggested.