研究强磁场(0~10T)与工频(f=50Hz)交变电流(0~10A)的复合作用对Al-4.5mass%Cu合金凝固组织的影响.发现在施加垂直于磁场方向的交变电流时,会使电极间液态金属在电磁压力(P)作用下产生波动,导致合金凝固时枝晶组织的生长被打碎,出现等轴晶和颗粒状晶.在10T磁感应强度下,交变电流越大,波动越强,越易生成等轴晶和颗粒状晶;在10A交变电流下,磁感应强度增加到4T以后,等轴晶未随磁场的增加而完全转变成颗粒状晶;当(P)相同时,磁感应强度小的,容易出现等轴晶和颗粒状晶.
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