摘要
采用光学显微镜(OM)、扫描电镜(SEM)、EDS能谱分析等研究了Mg-6Al-1Nd-1Gd合金固溶与时效处理后的显微组织及在200℃和70 MPa条件下的高温压缩蠕变行为。结果表明:固溶+时效处理后Mg-6Al-1Nd-1Gd合金的β-Mg_(17)Al_(12)相几乎完全消失,金属间化合物为Al_(2)RE(Nd、Gd)相,且在晶界产生偏聚。蠕变后,热处理后合金的金属间化合物有所增加,T4态合金金属间化合物体积分数增加最多,高温蠕变抗力最好,蠕变量及稳态蠕变速率分别为1.8%及2.333×10^(-8) s^(-1),较铸态时的4.45%及5.817×10^(-8) s^(-1)分别降低了59.6%和59.9%。
Microstructure of Mg-6 Al-1 Nd-1 Gd alloys after solid solution and aging treatment and its high temperature compression creep behavior under 200℃and 70 MPa conditions were investigated by means of optical microscope(OM),scanning electron microscopy(SEM)and energy-dispersive spectroscopy(EDS)analysis.The results show that theβ-Mg_(17)Al_(12) phase of the Mg-6 Al-1 Nd-1 Gd alloy almost disappears after T6 heat-treatment,and the phase of the intermetallic compound is Al_(2)RE(Nd,Gd),which segregates in the grain boundary.After creep,the volume fraction of the intermetallic compounds of the alloy after heat treatment increases,and it is found that the increment of the volume fraction of the intermetallic compounds of the alloy after T4 heat treatment is the most,the high temperature creep resistance is the best,and the creep strain and steady-state creep rates are 1.8%and 2.333×10^(-8) s^(-1),respectively,which decrease by 59.6%and 59.9%compared with the as-cast alloy,respectively.
作者
王武孝
秦子禾
刘董超
雷晨
刘健
WANG Wu-xiao;QIN Zi-he;LIU Dong-chao;LEI Chen;LIU Jian(School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2021年第3期30-35,共6页
Transactions of Materials and Heat Treatment
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)。
