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Sliding displacements were measured by use of a square grid marker marked on the surface by vapour deposition of carbon through a mesh of copper (mesh size 25μm). Measurements of the amount of sliding were made for the components parallel to the tensile stress axis, and contribution of grain boundary sliding to total tensile strain was determined as functions of testing temperature and tensile strain. The grain boundary sliding depends strongly on temperature. At 200°C, grain boundary sliding is accompanied by the deformation in a region adjacent to grain boundary. This sliding behavior is closely associated with the serration of grain boundary by localized migration. The contribution of grain boundary sliding shows the maximum at the beginning of tensile deformation and then decreased with increasing strain. At 300°C and above, the amount of migration was more extensive, and alternate sliding and migration are observed. The contribution of grain boundary sliding shows a maximum at a strain of about 10% and then decreased with further increase in strain. The interaction between sliding and migration of grain boundary is important in high temperature deformation of polycrystalline metals.
- 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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