脉冲电流处理对ZA12合金凝固组织和力学性能的影响

Effect of Electric Current Pulse on the Solidification Structure and Mechanical Properties of the Casting ZA12 Alloy

研究了在ZA12合金凝固过程中的脉冲电流处理对合金凝固组织和力学性能的影响。结果表明,凝固过程中的电脉冲处理明显细化了合金的凝固组织,使枝晶尺寸减小,近球状组织增多;试样的抗拉强度也有提高。经分析认为,这与脉冲电流通过金属熔体时促进晶粒游离,均匀熔体的温度场和溶质场有关。

The effect of electric current pulse on the casting ZA12 alloy was investigated.The results show that the primary phase in the solidification structure with electric current treatment evolves into nearspherical fine particle from normal dendrite and the tensile strength is improved.The accelerated particledrift and heat transfer causedby electropulsing pressure during electric current pulse treatment may result in these changes.