A microstructural correlation between the mechanical behavior of large volume fraction particulate composites at low and high temperatures
✍ Scribed by T.R. McNelley; G.R. Edwards; O.D. Sherby
- Publisher
- Elsevier Science
- Year
- 1977
- Weight
- 1017 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0001-6160
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✦ Synopsis
Unusually high yield strengths, up to E/l 10 where E is Young's modulus, and high rates of work hardening have been observed in zinc-based particulate composites at low homologous temperature (T 5: 0.1 T,}. These composites contain a iarge volume fraction (--0.3) of unifo~Iy distributed W particles (<0.6 m in dia.) or AllO, particles (0.6 or 0.3 mn in dia.) in a fine grained zinc matrix. At low homologous temperatures. particles are assumed to be sources of geometrically necessary dislocations, and work hardening due to these dislocations is evaluated on the basis of a single parameter, the geometric slip distance >.,~ A model previously developed by the authors for elevated temperature iup to 0.8 T,) deformation in these composites also considers the particles to be dislocation sources in a line, stable microstructure. The geometric siip distance i., is incorporated into the model for elevated temperature deformation and the mechanical behavior of these particulate composites is then consistently and accurately described for temperatures from 0.1 to 0.g TM.
R&urn&-On a observe des limites elastiques inhabituellement elevtes-jusqu'l