变质剂与电脉冲复合处理对Al7SiMg合金组织与性能的影响  

Effects of Modifier and Electric Pulse Compound Treatment on Microstructure and Properties of Al7SiMg Alloy

作　　者：肖世林 王傲[1] 王晓彤 李大勇[1] XIAO Shi-lin;WANG Ao;WANG Xiao-tong;LI Da-yong(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 15008 Heilongjiang,China)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院,黑龙江哈尔滨150080

出　　处：《铸造》2023年第2期147-152,共6页Foundry

摘　　要：通过调整变质剂含量和电脉冲峰值电压和脉冲频率,研究了变质剂与电脉冲复合处理对Al7SiMg共晶相生长分布的影响。试验结果表明:适当参数的电脉冲处理Al7SiMg合金熔体时,α相的晶体形貌尺寸减小,共晶硅β相长针状形貌得到抑制,晶体形貌不再尖锐;并且脉冲电压的作用大于脉冲频率;0.01%Sr与电脉冲复合处理时,能改善树枝晶分支之间产生的硅溶质偏析,细化硅晶体形貌;复合处理后的拉伸断口合金韧窝数量进一步增多,解理面减少,抗拉强度提高。By adjusting the content of chemical field modifier and the peak voltage and pulse frequency of electrical pulse in the physical field,the effects of the combined treatment of modifier and electric pulse on the growth distribution of Al7SiMg eutectic phase were studied.The experimental results showed that when the Al7SiMg alloy melt was treated by electric pulses with appropriate parameters,the size of the crystal morphology ofαwas reduced,theβ-phase needle-like morphology of eutectic silicon was suppressed,the crystal morphology was no longer sharp;and the priority of pulse voltage more than the pulse frequency.When 0.01%Sr was combined with the electric pulses,it can improve the segregation of silicon solutes between the branches of dendrites and refine the morphology of the silicon crystals.The number of dimples of the alloy in the tensile fracture after compound treatment was further increased,and the cleavage surface was reduced and the tensile strength was increased.

关 键 词：Al7SiMg 电脉冲处理 SR变质 复合处理 显微组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]