采用两种晶体取向的单边缺口试样，在循环压缩载荷下对Ｎｉ３Ａｌ基合金单晶体的疲劳裂纹萌生和扩展行为进行了研究．在循环压缩载荷下，第一阶段的晶体学开裂在缺口根部同时沿着两个或更多的｛１１１｝面发生．缺口根部裂纹萌生门槛值赖于晶体取向．在（１００）［０１０］的试样中，不同的｛１１１｝面相互交割而导致了解理块从试样的（００１）表面脱落，但在（１１０）［１１０］试样中始终没有观察到上述现象．据此，提出了循环压缩载荷下依赖于取向的裂纹扩展机制．
Fatigue cracking in Ni3Al single crystals with two kinds of orientation was examined by means of single-edge notch specimens under cyclic compression. Stage I cracking along two or more {111} planes can occur from the notch root simultaneously. There exists an orientation dependence of the crack initiation threshold under cyclic compression. The cleavage chunk falling off from the specimen surface due to the intersection of different {111} planes was observed in (100)[010] specimen, but never observed in (110)[110] specimen. Subsequently, the mechanism of crack growth which is dependent on orientation was proposed in this paper. Correspondent: ZHANG Guangping, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015
参考文献
| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] | PopeDP,EzzSS．IntMetRev,1984 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%