摘要
采用光学显微镜(OM)、扫描电镜(SEM)、EDS能谱分析等手段研究了Mg-6Al1Nd-xGd(0,0.5,1,1.5)合金的时效硬化行为及时效处理(T6)对合金高温拉伸性能的影响,结果表明:Gd元素的加入使Mg-6Al-1Nd合金的时效过程延长,随Gd含量的增多,合金在200℃时效时的硬度峰值从28 h延迟到36 h附近,且Gd含量为1%时合金峰值硬度最大,达到HV51.1。T6处理后,合金的强度及塑性都有所提升,Mg-6Al-1Nd-1Gd合金在200℃的抗拉强度为146 MPa,伸长率为22.3%,较铸态分别提高27.5%和29.7%,合金表现出良好的综合高温拉伸性能。
Age hardening behavior of Mg-6Al-1Nd-xGd(0,0.5,1,1.5)alloys and effect of aging treatment on mechanical properties of Mg-6Al-1Nd-1Gd alloy were investigated by means of optical microscope(OM)and scanning electron microscopy(SEM)equipped with energy-dispersive X-ray spectroscopy(EDS).The results show that when alloys with different Gd content are aged at 200℃,the time of reaching the peak hardness is prolonged from 28 h to 36 h and the peak hardness of the alloy is the largest to HV51.1 when the Gd content is 1%.After T6 treatment,the strength and plasticity of the alloy have been improved.The tensile strength and elongation of the alloy at 200℃are 146 MPa and 22.3%,respectively,which are 27.5%and 29.7%higher than those in the as-cast state,respectively.
作者
王武孝
秦子禾
陈晓港
李武钊
刘健
WANG Wu-xiao;QIN Zi-he;CHEN Xiao-gang;LI Wu-zhao;LIU Jian(School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,Shaanxi,China;Faculty of Printing,Packaging Engineering and digital media technology,Xi’an University of Technology,Xi’an 710054,Shaanxi,China)
出处
《铸造》
CAS
北大核心
2021年第3期346-350,共5页
Foundry
基金
国家自然科学基金(51771146)
陕西省自然科学基础研究计划项目(2019JM-180)。
