A.Q. Lü
,
Y. Zhang
金属学报(英文版)
By means of surface mechanical attrition treatment (SMAT), the grain size with a diameter of about 60nm formed at about 20μm depth and numerous mechanical twins at about 50μm depth from the treated surface were synthesized in 316L stainless steel because of the different distributions of strain and strain rate along depth orientation. For instance the maximum strain rate reached 103-104s-1 on the top surface. The relationship between the microstructure and the corrosion property was studied in 0.05M H2SO4+ 0.25M Na2SO4 aqueous solution, and the results show an extreme improvement of corrosion resistance owing to the appearance of twin boundaries and the obvious reduction in corrosion resistance attributed to the presence of nanocrystaline boundaries.
KEY WORDS surface mechanical attrition trea
关键词:
surface mechanical attrition treatment
,
腐蚀性能
,
孪晶界
,
纳米晶界
要玉宏
,
何益可
,
陈建
,
王伟
,
刘江南
稀有金属材料与工程
通过OM、XRD、SEM、EDS以及室温压缩试验等方法对Mg-5.3Nd合金的金相组织、退火强化行为以及压缩变形机制等进行了研究.结果表明:550℃/8 h固溶处理后,铸态Mg-5.3Nd合金的第二相Mg12Nd基本消除.经预压缩-卸载-再压缩试验,固溶Mg-5.3Nd合金的压缩强度没有明显变化,而预压缩-卸载-退火处理-再压缩试验后,合金的压缩强度明显提高,并获得最佳强化效果的退火工艺为180℃/4 h.原位金相分析发现,未退火试样的再压缩变形机制表现为预变形孪晶的明显长大.而预变形试样退火后,由于钕元素对预变形孪晶的钉扎作用,其再压缩变形机制以新变形孪晶的形成为主.
关键词:
Mg-5.3Nd镁合金
,
孪晶界
,
固溶处理
,
退火强化
