Anisotropic strain hardening following load reversal during high-temperature creep testing of superalloy single crystals
✍ Scribed by M.C. Carroll; K. Serin; G. Eggeler
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 402 KB
- Volume
- 387-389
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
A critical examination and qualitative evaluation of anisotropic creep behavior in nickel-based superalloy CMSX-4 single crystals is provided with respect to previously established models describing pure shear creep of specimens deformed at high temperatures. Using double-shear creep deformation samples, a complete reversal of applied creep stress results in a large increase in creep rate in the opposite direction.
During forward creep, dislocation networks build up that are trapped in ␥ channels along ␥/␥ interfaces. The sense reversal in applied stress effectively releases the dislocation networks, resulting in a large jump in measured creep rates.