交流电脉冲对过共晶Al-Si合金中初生Si相偏析的作用机制

张利民, 李宁, 朱龙飞, 殷鹏飞, 王建元, 吴宏景

Macrosegregation Mechanism of Primary Silicon Phase in Cast Hypereutectic Al-Si Alloys Under Alternating Electropulsing

ZHANG Limin, LI Ning, ZHU Longfei, YIN Pengfei, WANG Jianyuan, WU Hongjing

图1 有无电脉冲时Al-30%Si合金铸造凝固组织的OM像

Fig.1 Solidification macrostructures of as cast Al-30%Si alloy without electropulsing (a) or with electropulsing of 230 A/cm2 (d) and high magnified OM images of region b (b), region c (c), region e (e), and region f (f) (Areas 1, 2, and 3 in Fig.1f show the coarse plate-like, refined plate-like, and fine polygon morphologies, respectively)