低温領域での超塑性Al-Zn共析合金の引張り変形中の微細組織
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Scanning electron microscopy and transmission electron microscopy using plastic-carbon replicas were carried out of the fine-grained Al-Zn eutectoid alloys tensile deformed at different strains at 230 to 300K. Both grain boundary sliding (GBS) and crystallographic slip (CS) occur in the normal deformation region in which the alloys deform at low temperature (230-253K) and high stress. The crystallographic slip is more predominant than GBS in the alloys having coarse grain size (L>2μm), but GBS predominates in the alloys of fine grain size (L<1μm). Grain boundary cavities formed by GBS tend to grow and connect to each other with increase of strain. Although both GBS and CS occur in the transition region in which the alloys deform. at intermediate temperature (280-300K) and intermediate stress, GBS is always more predominant than CS. An isotropic equiaxial structure having average grain size 2 to 4μm is preferable for plastic working. The fracture mode is also described.
- 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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