脉冲电流与Al-5Ti-1B变质剂对7075铝合金铸态组织的影响  

Effects of Impulse Current and Al-5Ti-1B Master Alloy on the As-Cast Microstructure of 7075 Aluminum Alloy

作　　者：孙中源[1,2] 梁宇[1,2] 明正兴[1,2] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550003 [2]贵州省材料结构与强度重点实验室,贵州贵阳550003

出　　处：《铸造》2012年第8期873-876,共4页Foundry

基　　金：贵州省科技攻关计划(黔科合GY字〔2010〕3028);贵州大学研究生创新基金项目(理工2012028)

摘　　要：研究了低能量脉冲电流对7075铝合金的铸态组织的影响,并探究了Al-5Ti-1B变质剂和脉冲电流共同作用下对铝合金晶粒的作用效果。结果表明,脉冲电流孕育处理能有效减少铸造组织的二次枝晶的数量;Al-5Ti-1B能明显地细化组织晶粒;而7075铝合金熔体在凝固阶段持续通入脉冲电流后,铸造组织形貌明显改善,得到较为均匀的等轴晶和近球形晶粒。The influence of low energy impulse current on the as-cast microstructure of 7075 aluminum alloy was investigated, and the effect on aluminum alloy grain was also explored under the combined action of Al-5Ti-1B and impulse current. The results show that the treatment of impulse current inoculation can reduce the number of the secondary dendrite of as-cast microstructure effectively; the crystal grain of aluminum alloy was refined apparently by Al-5Ti-1B; the morphology of as-cast microstructure, which was controlled to achieve the equiaxed and spherical grains, was greatly improved when the impulse current was added to the 7075 aluminum alloy during the solidification process; this experiment may provide a theoretical reference for the application of impulse current technology to cast aluminum alloy.

关 键 词：7075铝合金 脉冲电流 Al-5Ti-1B 铸态组织 

分 类 号：TG27[金属学及工艺—铸造]