Zr和脉冲磁场对Mg-Y-Zn-Ca合金组织及压缩性能的影响  

Effects of Zr and Pulsed Magnetic Field on Solidified Structure and Compression Properties of Mg-Y-Zn-Ca Alloy

作　　者：李鹏 周全[1] 陈舸[2] 陈乐平[1] 谢东原 Li Peng;Zhou Quan;Chen Ge;Chen Leping;Xie Dongyuan(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University;Shanghai Spaceflight Precision Machinery Institute)

机构地区：[1]南昌航空大学航空制造工程学院 [2]上海航天精密机械研究所

出　　处：《特种铸造及有色合金》2020年第4期431-435,共5页Special Casting & Nonferrous Alloys

基　　金：上海航天科技创新基金资助项目(SAST2019-130);江西省教育厅科技基金资助项目(GJJ170580)。

摘　　要：对比研究了未处理、Zr处理、脉冲磁场处理及脉冲磁场-Zr复合处理对长周期结构增强Mg-5Y-2.5Zn-1.2Ca合金凝固组织及压缩性能的影响,同时考察了复合处理条件下脉冲电压和频率对合金的影响。结果表明,Zr处理、脉冲磁场处理、复合处理后,合金的凝固组织和压缩性能均有所改善,其中复合处理的效果最好;与未处理合金相比,复合处理后合金的抗压强度和压缩率分别提高43.9%和15.4%。在0~300V内,随着脉冲电压增大,合金的平均晶粒尺寸逐渐减小;在1~10Hz内,随着脉冲频率增大,合金的平均晶粒尺寸先减小后增大,转折点为5Hz。晶粒尺寸越小,合金的第二相分布越均匀。合金的压缩性能与其晶粒尺寸基本对应。Effects of untreated,Zr modification,treatment of pulsed magnetic field and compound treatment of pulsed magnetic field and Zr were investiagted on the solidified structure and compression properties of Mg-5Y-2.5 Zn-1.2Ca alloy enhanced by long period structure.Effects of pulse voltage and frequency on the alloy under compound treatment condition were also analyzed.The results show that after Zr modification,treatment of pulse magnetic field and compound treatment,solidification structure and compression properties of the alloy are improved,and the compound treatment presents the desirable effect.The compressive strength and compression ratio of the alloy with compound treatment are increased by 43.9% and 15.4%,respectively.In the range of 0~300 V,as the pulse voltage increases,grain size of the alloy is decreased gradually.In the range of 1~10 Hz,as the pulse frequency increases,grain size of the alloy is decreased at first and then increased,and the turning point is 5Hz.The smaller the grain size is,the more uniform the second phase distribution is.The compressive properties of the alloy are corresponded to its grain size.

关 键 词：ZR 脉冲磁场 Mg-Y-Zn-Ca合金 凝固组织 压缩性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]