摘要
利用X射线衍射、透射电镜观察等方法研究了Cu 11 9Al 2 5Mn合金的马氏体结构及其在时效过程中的变化。该合金淬火态马氏体为单斜 18R结构 (M18R) ,点阵常数为 :a =0 4 4 75nm ,b =0 5 2 2 9nm ,c=3 815nm ,β =89 6°。特点是单斜角β很大 ,已非常接近正交 18R结构 (N18R) ;马氏体内存在两种类型的面缺陷 ,一种是基面堆垛层错 ,另一种是非基面堆垛层错 ;时效时马氏体由单斜向正交转变的过程在一定程度上受到抑制 ,因而具有较高的抗马氏体稳定化的能力。
The martensite structure and its variation during aging in Cu\|11 9Al\|2 5Mn( w .%) alloy are studied by X\|ray diffraction, electron diffraction and ρ\|T curve measurements. The structure of 18R martensite under water\|quenching is determined using X\|ray diffraction as a modified 18R type with lattice parameters of a =0 4474nm, b =0 5229nm, c =3 815nm and β=89 6°. Two kinds of planar defects in martensite, basal stacking fault and non\|basal stacking faults have been observed with transformation electron microscopy. The martensite stabilization is weakened during aging since the martensite structure transformation from monoclinic into orthorhombic is restraint.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2002年第2期16-19,共4页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助 (编号 50 0 71 0 69)
