414 低加工を加えた後のゴムメタルの回復・再結晶(OS4-(4)オーガナイズドセッション《材料と組織》)

概要

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Gum Metal is a newly developed beta titanium alloy, which has a low elastic modulus, high strength, highly super-elastic characteristics, super-plastic characteristics, Invar and Elinvar characteristics. These special characteristics have been attributed to its plastic deformation manner based on non-dislocation mechanism. The authors previously studied on the behavior of strain-induced grain boundary migration (SIBM) in the Gum Metal that is a popular annealing process in most metallic materials containing medium density of dislocation, in comparison with that in a Ti-15V-3Cr-3Sn-3Al alloy, typical bate titanium alloy, and showed that SIBM tended to be suppressed in the Gum Metal compared with the Ti-15V-3Cr-3Sn-3Al alloy, and that migrating boundaries were pinned by some ellipsoidal particles in the Gum Metal, leaving some spherical particles inside the grain (off the boundary). In the present study, pinning force for a single particle with both morphologies has been assessed, using the obtained results of dimension and morphology parameter of the two types of particles. It has been theoretically confirmed that pinning force of the ellipsoidal particles is larger than that of spherical particles. This has been attributed to the fact that the observed dimension and the area theoretically in contact with the boundary at the same volume is larger in the ellipsoidal particles.
一般社団法人日本機械学会の論文
2010-08-27