摘要
以经典轮毂材料A356铝合金为基础,复合添加Sr、Y微合金化后,利用光学显微镜(OM)和扫描电镜(SEM)研究了复合微合金化后A356铝合金组织。研究结果表明:相同工艺条件下加入不同Y,合金中共晶硅由长条状转变为针状或短纤维状组织,合金的组织逐渐细化,形成高熔点化合物Al3Y弥散于基体中。Fe元素与Y优先形成了部分Fe23Y6金属化合物,Sr为0.02wt%,Y为0.05wt%时,试验合金性能最优。
Compounded Micro-alloying by Sr and Y of classical A356 was die-casted in this research. The fracture mechanism was determined by OM and SEM. The results show that, Under same process conditions with different content of Y.The eutectic silicon became acicular or short fibrous structure from long strip,The microstructure is improved; The high-temperature hard phase Al3Y distributes gathering states,Fe23Y6 is formed preferentially. Y has refining effect on magnesium alloys grains When Sr content is 0.02wt% and Y content is 0.05wt%, the grains of A356 alloy are the finest.
出处
《科技信息》
2010年第23期I0059-I0060,共2页
Science & Technology Information
