摘要
采用高通量真空熔炼炉制备了Mg-xGd-3Y(-1Zn)-0.5Zr合金,利用光学显微镜(OM)、透射电镜(TEM)、扫描电镜(SEM)、能谱仪(EDS)微观检测以及室温拉伸等手段研究冷轧变形和热轧变形下合金微观组织的演变及力学性能。结果表明:经过冷轧变形的合金中,0-Zn合金的板材成形性最差,轧制板材容易开裂,断裂延伸率仅有2.8%。随着Gd含量增加合金的塑性逐渐下降,10-Gd合金的抗拉强度、屈服强度、延伸率分别为326 MPa、241 MPa、3.1%。而经过热轧变形的合金,0-Zn合金晶粒尺寸细化,组织也变得均匀,其抗拉强度、屈服强度、延伸率分别为369 MPa、298 MPa、3.9%。随着Gd含量的增加,合金的强度先增后减,9-Gd合金的综合力学性能最佳,其在50%轧制变形量下抗拉强度、屈服强度、延伸率分别为437 MPa、358 MPa、5.6%。因此,相对于冷轧变形的合金来说,热轧变形的合金综合性能更为优异。
Mg-x Gd-3Y(-1Zn)-0.5Zr alloy was prepared by high flux vacuum melting furnace.The microstructure evolution and mechanical properties of the alloy under cold rolling and hot rolling deformation were studied by means of optical microscope(OM),transmission electron microscope(TEM),scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and room temperature tensile test.The results show that the sheet formability of 0-Zn alloy is the worst,the rolled sheet is easy to crack,and the elongation at break is only 2.8%.With the increase of Gd content,the plasticity of the alloy decreases gradually.The tensile strength,yield strength and elongation of 10-Gd alloy are 326 MPa,241 MPa and 3.1%,respectively.After hot rolling deformation,the grain size of 0-Zn alloy is refined and the microstructure becomes uniform.The tensile strength,yield strength and elongation are 369 MPa,298 MPa and 3.9%,respectively.With the increase of Gd content,the strength of the alloy increases first and then decreases.The comprehensive mechanical properties of 9-Gd alloy are the best.The tensile strength,yield strength and elongation of 9-Gd alloy at 50%rolling deformation are 437 MPa,358 MPa and 5.6%,respectively.Therefore,compared with the cold rolled alloy,the comprehensive performance of the hot rolled alloy is more excellent.
作者
峰山
张韧
邓美金
FENG Shan;ZHANG Ren;DENG Meijin(School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第S01期454-460,共7页
Materials Reports
基金
2023内蒙古自治区高校基本科研业务费项目(RZ2300001692)。
关键词
稀土镁合金
热处理
LPSO相
显微组织
力学性能
rare earth magnesium alloy
heat treatment
LPSO phase
microstructure
mechanical properties
