Surface film softening as a problem of cleavage fracture
Conference
·
OSTI ID:293138
- Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
The author has examined experimental data on the phenomenon of surface film softening of quasi-brittle metals and intermetallics in the context of cleavage fracture and its interaction with the intrinsic plasticity of these materials. Surface film softening is manifested as increased plasticity and, in many instances, as reduced flow stresses of a substrate material due to enhanced dislocation generation associated with film-substrate constraint under applied stress. Nominally ductile refractory metals such as Nb and Ta can be substantially ductilized by surface films to the point of exhibiting appreciable free strain. More brittle metals, such as Mo or W exhibit film-enhanced plasticity, some evidence of free strain, and associated changes in fracture mechanisms. Intermetallic alloys and compounds, e.g., NiAl, FeAl, and MoSi{sub 2}, can exhibit film-enhanced plasticity but usually without significant changes in fracture behavior.
- OSTI ID:
- 293138
- Report Number(s):
- CONF-970980--; ISBN 0-87339-381-3
- Country of Publication:
- United States
- Language:
- English
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