Crystallographic study of fatigue cracking in Ni{sub 3}Al(CrB) single crystal
- Academia Sinica, Shenyang (China). State Key Lab. for Fatigue and Fracture of Materials
The effect of crystallographic orientation on the fatigue-crack initiation and propagation in Ni{sub 3}Al(CrB) single crystal was studied using a compact-tension specimen. Stage I crystallographic cracking and cleavage fracture were observed. Crystallographic cracking can occur on two or more {l_brace}111{r_brace} slip planes simultaneously. It was shown that the threshold stress intensity for crack initiation from the notch root exhibits a dependence on crystallographic orientation. In addition, an effect of orientation on microcracking behavior was also shown. The number of {l_brace}111{r_brace} planes intersecting with each other determines the different microscopic features on the cleavage fracture surface.
- Sponsoring Organization:
- National Natural Science Foundation of China, Beijing, BJ (China)
- OSTI ID:
- 484877
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 28, Issue 3; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fatigue crack propagation in Ni-based superalloy single crystals under multiaxial cyclic loads
Environment and microstructure effects on fatigue crack facet orientation in an Al-Li-Cu-Zr alloy