Anomalous temperature dependence of the yield stress by [l brace]11[bar 2]2[r brace]<[ovr 11]23> secondary pyramidal slip in cadmium crystals; 1: Experiments
- Kumamoto Univ. (Japan). Materials Science and Resource Engineering
- California Inst. of Tech., Pasadena, CA (United States)
Yield stress [sigma][sub y] due to [l brace]11[bar 2]2[r brace]<[ovr 11]23> slip (SPCS) in cadmium crystals is proportional to temperature T (anomalous temperature dependence). An increment of strain rate causes [sigma][sub y] to increase. The deformation proceeds inhomogeneously with the nucleation and growth of bundles of slip steps (BSS) which correspond to etch pit bands (EPB). The strain [epsilon][sub B] BSS or EPB is constant independent of applied strain. The density of dislocations in EPB is nearly constant independent of strain, strain rate and T. [epsilon][sub B] and the mean free path of edge dislocations decrease exponentially with increasing T. The above results suggest that the deformation mode by SPCS is similar to Lueders deformation and the growth rate of BSS or EPB width increases with increasing T and strain rate. The anomalous temperature dependence is interpreted by the immobilization of edge dislocations and the growth rate related with double cross slip.
- OSTI ID:
- 6987057
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Vol. 42:8; ISSN 0956-7151
- Country of Publication:
- United States
- Language:
- English
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