SHAPE MEMORY ALLOY PARTICLES DISPERSED TITANIUM COMPOSITE

概要

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TiNip dispersed Ti composite has been successfully produced by the SPS method. The composite is initially subjected to a prestrain below Ms, and then, loaded until failure above it after unconstrained heating. The effects of the prestrain level, test and prestrain temperatures, and aspect ratio of the particle are evaluated by both experiments and analysis. Enhancement of the elevated temperature tensile properties due to the imposition of compressive residual stress in the matrix is confirmed. The predictions provide good agreement with the experiments except that the properties are deteriorated in some conditions due to damage of a reaction layer. Noticeable advantage of the shape memory alloy (SMA) dispersed composite is that even if it is spherical, similar strengthening to the aligned fibrous composite can be achieved. The SMA particles exhibited spontaneous actuation during dynamic fracture. This implies the feasibility of actuating it by local temperature elevation due to the plastic deformation of the matrix.
一般社団法人日本機械学会の論文
2001-08-28