用光学显微镜和扫描电镜观察了〔321〕和〔110〕位向的铌单晶在循环变形时的表面形貌变化.研究了圆形试样经过循环变形到饱和阶段表面出现的皱褶.本文用形变带这个词来表示材料经不均匀变形后产生的这种皱带,它不同于有特定位向的扭折带.根据表面形貌细节把形变带分成五类,并对形变带的形成过程进行了讨论.形变带所在平面和轴向夹角均在≈45°,说明宏观应力状态对形变带的形成起重要作用.
The surface morphology of niobium single crystals with [321]and [110] orientations during the deformation has been observed. Specimens withround cross section have been cycled to the saturated stage and the surface topog-raphy of rumpled bands has been observed using optical and scanning electron mi-croscope. In the present paper, the term of "deformation band", which is defferentfrom the kink band with special orientation, is used to define the rumpled band ofmaterial that has undergone inhomogenous plastic deformation. According to thedetailed topography, the deformation bands have been further subdivided into fivetypes and their formation process has been discussed. The deformation bands lie onthe plane of approximately 45° to the loading axis, i. e. the plane of the maxi-mum shear stress, which indicates that the macroscopic state of stress plays an im-portant role on the formation of deformation bands.
参考文献
| [1] | |
| [2] | |
| [3] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%