杨晓红
,
彭丽梅
,
杨晨辉
,
贾波
,
安建
材料热处理学报
用XRD衍射和透射高分辨HTEM方法分析Mg-4Y-3Nd合金在固溶处理525℃×8 h、时效温度250℃、时效时间16 h状态下的显微组织、析出相的点阵结构和基体点阵常数变化.结果表明:经过固溶时效的Mg-4Y-3Nd合金的显微组织由α-Mg固溶体、析出相Mg24Y5、Mg41Nd5和Mg14Nd2Y组成.析出相在晶内和晶界同时析出,晶内析出相形状为块状或短杆状,呈弥散分布,晶界上析出相呈三角形为链状分布,时效析出相Mg14Nd2Y与基体为半共格界面位相关系.随着析出相的生成,基体的点阵常数变大,同一晶面的衍射角(2θ)减小,晶面间距增大.
关键词:
Mg-4Y-3Nd合金
,
固溶时效
,
析出相
,
位相关系
WANG Bowen
,
WU Changheng
,
ZHUANG Yuzhi
,
JIN Ximei(Institute of Metal Research
,
Chinese Academy of Sciences
,
Shenyang 110015
,
China)(Shenyang Institute of Technology
,
Shenyang 110023
,
China)
金属学报(英文版)
The phase relationships of R-Fe pseudobinary system(R=Dy0.65Tb0.25Pr0.1) have been determined using optical microscopy,X-ray diffraction,EPMA and DTA techniques.This system contains one eutectic reaction and four peritectic reactions.The four intermetallic compounds are(Dy,Tb,Pr)Fe2,(Dy,Tb,Pr)Fe3,(Dy,Tb,Pr)6Fe23 and(Dy,Tb,Pr) 2Fe17 The homogeneity regions of these compounds shift towards rare earth-rich side of the stoichiometric composition except(Dy, Tb,Pr) 2Fe17.
关键词:
:rare earth-iron alloy
,
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,
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