电流辅助压弯成形对Mg-2.5Nd-0.5Zn-0.5Zr合金微观组织和力学性能的影响  

Effect of electrically-assisted bending forming on microstructure and mechanical properties of Mg-2. 5Nd-0. 5Zn-0. 5Zr alloy

作　　者：王松辉 张文丛[3] 苏海 任彩霞 孙有平[4] 葛金锋 罗通 WANG Song-hui;ZHANG Wen-cong;SU Hai;REN Cai-xia;SUN You-ping;GE Jin-feng;LUO Tong(Guizhou Anda Aviation Forging Co.,Ltd.,Anshun 561005,China;Guizhou Academy of Sciences,Guiyang 550001,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;School of Mechanical and Automotive Engineering,Guangxi University of Science and Technology,Liuzhou 545616,China)

机构地区：[1]贵州安大航空锻造有限责任公司,贵州安顺561005 [2]贵州科学院,贵州贵阳550001 [3]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [4]广西科技大学机械与汽车工程学院,广西柳州545616

出　　处：《塑性工程学报》2024年第11期71-81,共11页Journal of Plasticity Engineering

基　　金：国家重点研发计划(2022YFB3706904);山东省重大创新工程(2019JZZY010364);贵州省高层次创新型人才项目(GCC [2023] 098)。

摘　　要：采用金相和透射电镜等技术系统研究了电流密度和保压时间对Mg-2.5Nd-0.5Zn-0.5Zr合金压弯成形“几”字型零件微观组织演变和成形性能的影响。结果表明,随着电流密度的增加(33.5~51.5 A·mm^(-2)),压弯“几”字型零件成形性能逐渐提高,回弹逐渐减小。随着保压时间的延长(0~20 s),回弹逐渐减小。当电流密度为51.5 A·mm^(-2),保压时间为20 s时,压弯成形的“几”字型零件表面质量良好、尺寸精度较高、基本无回弹,表现出良好的力学性能,硬度为63.8~71.3 HV。脉冲电流可以促进Mg-2.5Nd-0.5Zn-0.5Zr合金压弯成形过程中位错的滑移和攀移,减小位错塞积和缠结,同时释放残余应力,减小零件的回弹,进而提高Mg-2.5Nd-0.5Zn-0.5Zr合金的塑性变形能力和成形零件的精度。The effects of current density and holding time on the microstructure evolution and formability of bending formed cap-shape parts of Mg-2.5Nd-0.5Zn-0.5Zr alloy were systematically studied by means of metallographic microscope and transmission electron microscopy.The results show that with the increase of current density(33.5-51.5 A·mm-2),the formability of the bending formed capshape parts improves gradually,and the springback reduces gradually.With the extension of the holding time(0-20 s),the springback reduces gradually.When the current density is 51.5 A·mm-2 and the holding time is 20 s,the surface quality of bending formed capshape parts is good,dimensional accuracy is high,and basically no springback,showing good mechanical properties,and the hardness is 63.8-71.3 HV.Pulsed current can promote the sliping and climbing of dislocations and reduce the dislocation plugging and entangling during the bending forming process of Mg-2.5Nd-0.5Zn-0.5Zr alloy,meanwhile,release the residual stress and reduce the springback of parts.And then the plastic deformation ability of Mg-2.5Nd-0.5Zn-0.5Zr alloy and the accuracy of the formed parts are improved.

关 键 词：Mg-2.5Nd-0.5Zn-0.5Zr合金 电流辅助压弯成形 微观组织 力学性能 

分 类 号：TG306[金属学及工艺—金属压力加工]