固溶对挤压态Mg-11Li-3Al-xZr合金组织及力学性能的影响  

Effects of Solid Solution Treatment on Microstructure and Mechanical Properties of As-Extruded Mg-11Li-3Al-xZr Alloy

作　　者：刘旭贺 刘豫喜[1] 孙龙 肖阳 张红松[1] 刘洋 Liu Xuhe;Liu Yuxi;Sun Long;Xiao Yang;Zhang Hongsong;Liu Yang(School of Mechanical Engineering,Henan University of Engineering;Department of Light Metal,Zhengzhou Light Metal Research Institute;College of Materials Science and Engineering,Yanshan University)

机构地区：[1]河南工程学院机械工程学院 [2]郑州轻金属研究院金属材料研究所 [3]燕山大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2018年第12期1288-1292,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51371161);河南省高校科技创新团队资助项目(18IRTSTHN005);河南工程学院博士基金资助项目(D2017015)

摘　　要：对挤压态Mg-11Li-3Al-xZr(x=0,0.1)合金进行了不同温度的固溶处理,采用金相观察、X射线衍射、扫描电镜观察以及硬度、拉伸测试等手段,研究了固溶处理后合金的显微组织及力学性能。结果表明,挤压态Mg-11Li-3Al合金由β-Li、α-Mg、θ-MgLi2Al、AlLi相组成,450℃固溶处理后θ-MgLi_2Al、AlLi、α-Mg相溶解到β-Li基体中,晶粒尺寸粗化;添加0.1%的Zr后,Mg-11Li-3Al-0.1Zr合金中没有形成新相,450℃固溶处理后同样得到完全的β-Li单相合金,晶粒尺寸未发生明显改变,合金的热稳定性提高。随着固溶温度升高,Mg-11Li-3Al-xZr(x=0,0.1)合金挤压板硬度不断提高,在400～450℃之间达到最大;屈服强度及抗拉强度随固溶温度升高而变大,但伸长率降低。The as-extruded Mg-11 Li-3 Al-xZr(x=0,0.1)alloy was treated by solid solution at different temperatures.The microstructure and mechanical properties of the alloys after solid solution treatments were investigated by OM,XRD,SEM,hardness and tensile test.The results reveal that the as-extruded Mg-11 Li-3 Al alloy is mainly composed ofβ-Li phase,α-Mg phase,θ-MgLi2 Al phase and AlLi phase,and these phases are redissolved in theβ-Li matrix after solid solution treatment at 450℃,and the grain size is coarsened.The Mg-11 Li-3 Al-0.1 Zr alloy is mainly also composed ofβ-Li phase,α-Mg phase,θ-MgLi2 Al phase,AlLi phase with absence of new phase generation,and theβ-Li single-phase alloy can be generated by solid solution treatment also at 450℃,meanwhile,the grain size cann’t be changed obviously,however,the thermodynamic stability is improved.With the increase of solution temperature,the hardness of as-extruded Mg-11 Li-3 Al-xZralloy(x=0,0.1)is increased,and reaches the peak value at 400~450℃.Meanwhile,the yield strength and tensile strength of the alloy are increased significantly,while the elongation is decreased.

关 键 词：MG-LI合金 固溶处理 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]