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Subgrain size of high purity aluminum deformed in torsion at various temperatures and strain rates was measured, and room temperature compression tests were carried out on these samples with subgrains ranging 2-30μm. The retention of subgrains developed during warm and hot working leads to the enhancement of mechan-ical properties. The room temperature strength of substructure strengthened materials correlates well with the size of the retained subgrains and is shown to follow the modified Hall-Petch relation: δ=δo+KD-1/2+kd-m. Here, δo and KD-1/2 are the usual Hall-Petch terms and kd-m is the strength increment due to the presence of a hot-worked substructure. The exponent m was observed to be 1 for this material. The strength increment due to the presence of subgrains was observed to be proportional to a power of the temperature-compensated strain the in hot working. Thus a simple correlation exists between the high temperature deformation conditions and rate room temperature strength.At grain sizes less than about 7 μm, strengthening due to subgrains appear to be more effective than grains of the same size. This suggests that substructure-strengthening may be more important than strengthening by grain refinement in this grain size range.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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