摘要
提出了一种利用工频电流制备表面增强复合材料的新方法,其特点是: 对合金熔体施加一个交流电,利用交流电及其感生磁场产生的电磁力,迫使电导率较低的第二相向边缘迁移,凝固后得到表面增强的复合材料.利用该方法原位制备了表面硅增强的铝硅合金,表层硬度比单纯的铝基提高10～20倍.该方法工艺简单,不受铸件形状和尺寸的限制,可用于表面增强金属材料的规模化制备.
A novel strategy to fabricate surface reinforced metal composites by using an alternating current was reported. The basic principle is that an alternating current is imposed on a molten alloy, the resultant electromagnetic force induces the migration of low-conductivity phase towards the mould wall, thus a in-situ surface composite would be obtained after the solidification of alloy. The method was successfully applied to fabricate the Al-Si alloy reinforced by Si at surface, whose Vickers hardness was increased up to 10-20 times than that of aluminum matrix. Owing to the simplicity in process and the applicability for various shape-and size-casts, the technique allows the mass fabrication of metal-based surface composites.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第10期13-15,共3页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
关键词
铝硅合金
电磁分离
工频电流
表面增强复合材料
原位
Al-Si alloy
electromagnetic separation
alternating current
surface reinforced metal composite
in-situ
