TiNi synthesis from elemental powder components

Janet C. Hey; A. Peter Jardine

doi:10.1117/12.174086

1 May 1994 TiNi synthesis from elemental powder components

Janet C. Hey, A. Peter Jardine

Proceedings Volume 2189, Smart Structures and Materials 1994: Smart Materials; (1994) https://doi.org/10.1117/12.174086
Event: 1994 North American Conference on Smart Structures and Materials, 1994, Orlando, FL, United States

Abstract

Commercially, the shape memory alloy TiNi is produced by either vacuum induction melting or by vacuum arc remelting of the pure metal ingots. Powder metallurgy techniques provide an alternative fabrication route but problems arise achieving chemical homogeneity. In this study TiNi compacts were cold pressed from the blended elemental powders and sintered in vacuum for varying times at temperatures from 800 degree(s)C to 1000 degree(s)C. Two heating rates were used, 5 K/min and 10 K/min. A TiNi microstructure could be produced after annealing at 1000 degree(s)C for 6 hrs, although some TiNi₃ was still observed. This is likely to be difficult to completely remove as TiNi₃ is thermodynamically more stable than TiNi. Thus, homogenization is unlikely to be completed by solid-state diffusion processes. The martensitic B19' structure was observed to be highly oriented after processing.

Citation Download Citation

Janet C. Hey and A. Peter Jardine "TiNi synthesis from elemental powder components", Proc. SPIE 2189, Smart Structures and Materials 1994: Smart Materials, (1 May 1994); https://doi.org/10.1117/12.174086

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