| Autor: |
R. Stickler, Brigitte Weiss, Toshiro Kobayashi, ZhengMing Sun, Zhongguang Wang |
| Rok vydání: |
1995 |
| Předmět: |
|
| Zdroj: |
Scripta Metallurgica et Materialia. 33:399-405 |
| ISSN: |
0956-716X |
| DOI: |
10.1016/0956-716x(95)00219-l |
| Popis: |
The deformation behavior of a recrystallized high purity Mo at constant stresses and at moderately elevated temperatures up to 90 C was studied. A creep-like viscoplasticity was observed at the tested stress levels for below the yield stress. Upon loading to a constant stress level the specimen indicated a rapid initial increase in strain. then the material deforms to an exponential law and tends to saturate as time goes infinite. It was found that the testing temperature has a strong effect on the initial strain rate, while little effect on the saturation strain was found. The saturation strain increases with increasing stress. A mechanical model was proposed employing an elastic element, a viscous element and a rigid-plastic element. This model accounts well for the experimentally observed deformation behavior in Mo. Micromechanically, the kink-pair model was cited for the interpretation. Possibly some other mechanisms could also operate at the same time, including the grain boundary sliding in this fine grain sized microstructure. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect