铸造2012，Vol.61Issue(3)：251-254,4.
低压交流脉冲对A357合金凝固宏观组织的影响
Effect of Low-Voltage Alternating Current Pulse Treatment on the Macrostructure of A357 Alloy
摘要
Abstract
Based on the A357 aluminum alloy, the effect of low-voltage alternating current pulse (LVACP) on the macrostructure of alloy was investigated by using LVACP treatment. The experimental results indicate that the macrostructure for whole ingot could be refined with LVACP and there was a threshold value and a saturation value for the current density used to refine grain. Although the pulse current was applied to different stages of the solidification, the refinement effect occurs only during the nucleation stage. The effect of current density on grain density was similar to that of undercooling. The nucleation barrier was reduced by providing an additional energy during the nucleation stage, which would lead to a multiplication of the crystal nuclei and refinement of grain.关键词
A357铝合金/低压交流脉冲/宏观组织/晶粒细化Key words
A357 aluminum alloy/low-voltage alternating current pulse/macrostructure/grain refinement分类
矿业与冶金引用本文复制引用
陈文静,张利民,武跃维,张蓉..低压交流脉冲对A357合金凝固宏观组织的影响[J].铸造,2012,61(3):251-254,4.基金项目
西北工业大学研究生创业种子基金资助(Z2010082). （Z2010082）
