A micromechanical model for creep in short fiber reinforced aluminum alloys
Journal Article
·
· Acta Metallurgica et Materialia
- Swiss Federal Inst. of Tech., Lausanne (Switzerland)
Three elementary microstructural processes control creep of short fiber reinforced, squeeze cast aluminum alloys: (1) loading of fibers by dislocations through the formation of a work hardened zone (WHZ), (2) a recovery mechanism which decreases the dislocation density in the WHZ, and (3) multiple breakage of fibers. A uniaxial micromechanical model is presented which is based on these three elementary processes. The model rationalizes the shape of individual creep curves as well as the temperature and stress dependence of the minimum creep rate. The minimum creep rate is shown to result from a superposition of primary (loading of fibers by dislocation) and tertiary (breakage of fibers and shortening of the length of the recovery path) processes.
- OSTI ID:
- 27886
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 2 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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