摩擦攪拌プロセスによる生体用 β 型 Ti-29Nb-13Ta-4.6Zr 合金の表面改質層と機械的性質

概要

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This study investigated the effect of the friction stir process (FSP) on the mechanical properties and microstructure of biomedical beta-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (TNTZ), and Ti-6Al-4V ELI (Ti64), which is one of representative biomedical alpha/beta type titanium alloy used in practical applications. The surface layer of TNTZ subjected to FSP was composed of severely deformed and heat-affected zones with a large amount of precipitated fine alpha phases or relatively coarse beta phases. On the other hand, the surface layer of Ti64 was comprises almost entirely of a heat-affected zone with relatively small acicular alpha and beta phases in the prior beta phase. Vickers hardness of TNTZ and Ti64 subjected to FSP showed the highest value at the very edge of the specimen surface and decreased significantly with increasing depth from the surface. The trend in the change of Young's modulus of TNTZ and Ti64 subjected to FSP was approximately the same as the change in the Vickers hardness. The tensile strength of TNTZ subjected to FSP increased by around 100 MPa when compared to that of as-solutionized TNTZ. The elongation, however, showed a reverse trend. The change in the tensile properties of Ti64 subjected to FPS was small.
日本金属学会 ; 1937-の論文