A micromechanical model for creep in short fibre reinforced aluminium alloys
1995; Elsevier BV; Volume: 43; Issue: 2 Linguagem: Inglês
10.1016/0956-7151(94)00255-g
ISSN1873-2879
AutoresA. Dlouhý, Gunther Eggeler, N. Merk,
Tópico(s)Aluminum Alloy Microstructure Properties
ResumoThree elementary microstructural processes control creep of short fibre reinforced, squeeze cast aluminium alloys: (i) loading of fibres by dislocations through the formation of a work hardened zone (WHZ), (ii) a recovery mechanism which decreases the dislocation density in the WHZ, and (iii) multiple breakage of fibres. 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 fibres by dislocations) and tertiary (breakage of fibres and shortening of the length of the recovery path) processes.
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