| Autor: |
Morita, Shigeki, Ohno, Nobuyoshi, Tamai, Fujio, Kawakami, Yuji |
| Zdroj: |
Materials Science Forum; January 2012, Vol. 706 Issue: 1 p1233-1236, 4p |
| Abstrakt: |
This paper describes the fatigue crack propagation behavior of extruded AZ31B magnesium alloys (average grain size: approximately 15 and 119 μm, respectively). Fatigue crack propagation tests were performed on center cracked tension (CCT) specimens at a stress ratio of R=0.1 and a frequency of 10 Hz at room temperature. Loading axis was parallel to the extrusion direction; crack face was perpendicular to basal plane of each grain. The crack growth rate (da/dN) of the coarse-grained specimen was approximately 5 times higher than that of the fine-grained specimen. Fracture surfaces of the fine-grained and coarse-grained specimens showed various directional steps independent of macroscopic crack growth direction. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
