摘要
热处理是提升变形稀土镁合金综合力学性能的常用方法,探明合理的工艺参数,掌握合金组织与性能演变规律是需要解决的关键问题。研究了固溶与时效处理对变形态Mg-Gd-Y-Zn-Zr合金微观组织与硬度的影响,实验结果表明:原始变形态合金主要由α-Mg基体、破碎的块状14H-LPSO相与β-Mg 5(Gd,Y,Zn)组成;经过固溶处理后,合金组织中块状LPSO相溶于基体,体积分数减小,并析出片层状LPSO相,最佳固溶处理制度为520℃×16 h,合金硬度为94.50 HV;200℃下的合金峰时效保温时间为32 h,硬度为120.35 HV,欠时效析出相为β″相,峰时效析出相为β′相,过时效析出相为稳定的β-Mg 5(Gd,Y,Zn)相。
Heat treatment is an effective way to improve the comprehensive mechanical properties of deformed rare earth magnesium(Mg)alloys,and a key problem to be solved is finding out the reasonable process parameters and research the evolution of microstructure and mechanical properties.In this paper,the effects of solution and aging treatment on microstructure and microhardness of Mg-Gd-Y-Zn-Zr alloys are studied.The results shows that the as-received alloy is mainly composed ofα-Mg matrix,broken block-shaped 14H-LPSO phases andβ-Mg 5(Gd,Y,Zn)phases.After solution treatment,the block-shaped LPSO phases are dissolved in the matrix with the reduced volume fraction,and the lamellar LPSO phases are precipitated.The optimal solution treatment parameter is 520℃×16 h,the microhardness of the alloy is 94.50 HV.After aging treatment at 200℃×32 h,the microhardness of the alloy is 120.35 HV,the under-aging precipitation phase isβ″,the peak-aging precipitation phase isβ′,and the over-aging precipitation phase isβ-Mg 5(Gd,Y,Zn).
作者
李璐瑶
任璐英
闫钊鸣
胡博文
鲁泽
LI Luyao;REN Luying;YAN Zhaoming;HU Bowen;LU Ze(School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;Beijing Institute of Aerospace Information,Beijing 100854,China;College of Missile Engineering,Rocket Force University of Engineering,Xi’an 710025,China;Engineering Research Center for Magnesium-base Material Processing Technology,Ministry of Education,North University of China,Taiyuan 030051,China)
出处
《兵器装备工程学报》
CAS
CSCD
北大核心
2023年第10期72-77,共6页
Journal of Ordnance Equipment Engineering
基金
国家自然科学基金项目(52205428)
山西省应用基础研究计划(20210302124206)
山西省科技创新人才团队专项资助。
