摘要
以铝硅合金和球墨铸铁为研究对象,分别采用正常热处理、室温及高温下施加脉冲电流处理的方法,研究了脉冲电流对固态金属中非金属相形态的影响.结果表明:在脉冲电流处理下,铝硅合金中粗杆状共晶硅的粒化速度加快;球墨铸铁经脉冲电流处理后,原有石墨的直径没有明显增大,石墨的平均似圆度略有增加,组织中出现了新生的球状小石墨;在脉冲电流作用下非金属相周围位错的行为及原子的扩散是决定非金属相形态的主要原因.
The effect of pulse current on the shape of non-metal phases in solid metals,such as Al-Si alloys and ductile cast irons,was studied by applying pulse current at room-temperature and high temperature and compared to normal heat processing.The results show that pulse current accelerates the granulation of coarse band-form eutectic silicon in the Al-Si alloy.The diameter of original graphite in the ductile cast iron treated by pulse current does not increase obviously,the average round-shaped degree of graphite increases a little,and some spherical graphite appears in the structure.The behavior of dislocations adjacent to non-metal phases and the diffusion of atoms by the action of pulse current are main reasons for the shape of non-metal phases.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2011年第10期1238-1242,共5页
Journal of University of Science and Technology Beijing
基金
辽宁省教育厅资助项目(2008T089)
关键词
铝硅合金
球墨铸铁
脉冲电流
共晶硅
石墨
aluminum-silicon alloys
ductile cast irons
pulse current
eutectic silicon
graphite
