Abstract
The chill block melt spinning technique has been used to produce rapidly solidified (RS) equiatomic Ti–Ni ribbons. The spun material has been consolidated by conventional powder metallurgy techniques. The compaction and sintering behaviour of the prealloyed powder is compared with that of elemental blend powders. The high initial hardness of the RS powder results in lower compressibility. Sintering temperatures in excess of those used for elemental blend particles are necessary for the RS prealloyed material. This phenomenon is related to the different partial diffusion coefficients of titanium and nickel leading to vacancy generation during sintering of elemental powder compacts. The densities of elemental blend compacts decrease during sintering, unlike RS prealloyed particle specimens, which densify. RS processing causes a depression in the M s temperature of Ti–Ni. Among other reasons for the decrease in M s is the grain refinement caused by rapid solidification. PM/0373
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