COMBUSTION REACTION OF Ni_(20)Ti_(50)C_(30) DURING MECHANICAL ALLOYING

The combustion reaction was observed during mechanical alloying Ni20Ti50C30, and the agglomerates and powders coexisted in final product. With the analysis of X-ray diffraction (XRD) and the observation of scanning electron microscope (SEM), it is indicated that melting occurred in the combustion reaction. The product is composed of TiC phase and NiTi compound. It is regarded that the initial TiC is produced by the heavy collision of balls during milling, and then the large heat released from the TiC formation induces the latter reactions.