| Autor: |
Fedorov, V. A., Pluzhnikova, T. N., Fedotov, D. Yu. |
| Zdroj: |
Journal of Surface Investigation: X-Ray, Synchrotron & Neutron Techniques; Feb2022, Vol. 16 Issue 1, p63-67, 5p |
| Abstrakt: |
The features of the fatigue failure of amorphous ribbon alloys during tensile and bending tests are considered. The mechanisms of fatigue failure based on redistribution of the excess free volume in the samples are proposed. The fatigue-crack growth mechanism in tensile tests is as follows. After nucleation from the end surface of the sample at the load concentrators, the crack forms a series of micropores in front of its apex due to redistribution of the excess free volume. After failure, micropores form a characteristic banded relief on the fracture surface, which is observed up to the rupture area. At the same time, crack growth is accompanied by the formation of a "venous pattern" during the transition of the fatigue crack from one plane to another. Before bending tests, in an unloaded sample, the excess free volume is evenly distributed. In bending tests, the initially uniformly distributed free volume migrates mainly to the stretch region. Due to elastic interaction, accumulations of excess free volume are formed in planes normal to the stretching surface. Cracks are formed in these planes, the surfaces of which are tangentially shifted relative to each other. Further bending loads promote crack opening. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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