Abstract
In this work we have tried to produce powders of NiTi intermetallic compound from the composite wires of pure Ti wire with a diameter of 300μm and pure Ni wire with a diameter of 300μm to 250μm. The composite wire was melted and reacted using a YAG laser, and the melted metal was gas-atomized using high-pressure Ar gas. The shape of powders recovered in dry ice was spherical and the particle size of the obtained powder ranged from 10μm to 125μm.
The compositions of the powders could be adjusted by changing the wire diameter of Ni in the composite wire, i.e., by changing the atomic ratio of Ti vs. Ni in the composite wire. Consequently, we produced powders of NiTi intermetallic compound with the purposive composition.
The powders with a Ti-Ni composition ratio of 1:1 were mainly consisted of NiTi martensite phase. By this manufacturing method, the powders of NiTi intermetallic compound with Ms temperature of 335 K and Af temperature of 365 K could be produced.
