摘要
采用定向凝固工艺,在单一变量下分别对Mg-3Zn-Y合金在不同温度梯度以及不同拉伸速度下显微组织和力学性能进行了研究。结果表明:随着温度梯度逐渐增大,柱状晶更加粗大、均匀,方向性也更好;随着凝固速度逐渐增大,柱状晶平均宽度逐渐变窄,平均晶粒尺寸逐渐减小,晶粒分布的均匀性逐渐降低,晶粒生长的方向性、连续性也逐渐变差。提高温度梯度、拉伸速度,均能改善合金力学性能。
By using directional solidification process,under a circumstance of single variable,the microstructure and the mechanical property of Mg-3 Zn-Y alloy was investigated under different temperature gradients and different stretching speed. The result indicates that with the increase of temperature gradient,the columnar crystal is coaser,more uniform and better directivity. As the solidification rate increasing,the average width of columnar crystal gradually narrows down,the grain size gradually decreases,the uniformity of the grain distribution gradually decreases,the growth direction and continuity of grain gradually deteriorate. Both by increasing the temperature gradient and the stretching rate can improve the mechanical property of the alloy.
出处
《大型铸锻件》
2017年第6期6-9,13,共5页
Heavy Casting and Forging
基金
晋城市科技计划项目(No.201501004-13)
山西省研究生创新项目(2016BY137)
