T6处理工艺对Mg-Y-Cu-Zr合金显微组织和力学性能的影响  

Effect of T6 Treatment Processes on Microstructure and Mechanical Properties of Mg-Y-Cu-Zr Alloy

作　　者：刘紫兰 钱芳娴 贾佳龙 张文琦 司越 章晓波[1] LIU Zilan;QIAN Fangxian;JIA Jialong;ZHANG Wenqi;SI Yue;ZHANG Xiaobo(School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing 211167,Jiangsu China)

机构地区：[1]南京工程学院材料科学与工程学院,江苏南京211167

出　　处：《热处理》2022年第3期1-4,共4页Heat Treatment

基　　金：江苏省大学生创新创业训练计划重点项目(202111276004Z);南京工程学院大学生科技创新项目(TB202102065);江苏高校自然科学研究重大项目(18KJA430008)。

摘　　要：采用重力浇注铸造法制备了Mg-6.6Y-2.6Cu-1.2Zr(质量分数,%)镁合金铸锭。对铸锭进行了420℃、440℃和460℃保温12 h水冷的固溶处理和200℃×12 h的时效处理。检测了合金的显微组织、力学性能、显微硬度和拉伸断口形貌。结果表明:随着固溶温度的升高,层片状长周期堆垛有序相先增多后消失,第二相从不规则形状演变成细长条状;440℃固溶处理随后200℃时效处理的Mg-6.6Y-2.6Cu-1.2Zr合金的屈服强度较铸态提高了37.4%,460℃固溶处理随后200℃时效处理的合金的屈服强度和断后伸长率均明显降低。Mg-6.6 Y-2.6 Cu-1.2 Zr(mass fraction,%)magnesium alloy ingots were fabricated by a gravity-pour casting practice.The ingots were subjected to solution treating consisting of heating at 420℃,440℃and 460℃for 12 h and then water cooling,followed by aging at 200℃for 12 h.After this,the alloy was tested for microstructure,mechanical properties,microhardness and pattern of tensile fracture.The results showed that(a)as solution temperature was increased,the lamellar long period stacking ordered(LPSO)phase increased at first and then disappeared,and the second phase changed from an irregular shape to a strip;and(b)the Mg-6.6 Y-2.6 Cu-1.2 Zr alloy solution treated at 440℃and then aged at 200℃exhibited 37.4%higher yield strength than that of the as-cast one,and the alloy solution treated at 460℃and then aged at 200℃exhibited considerably decreased yield strength and elongation.

关 键 词：Mg-Y-Cu-Zr镁合金 T6处理 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]