Ni20Ti50C30机械合金化过程中的爆炸反应

机械合金化Ｎｉ２０Ｔｉ５０Ｃ３０粉末发生了爆炸式反应，反应产物中粉末和块状样品共存，经Ｘ射线衍射分析和扫描电镜观察表明反应过程中各存在部分熔化。产物组成主要为ＴｉＣ和Ｎｉ－Ｔｉ金属间化合物。作者认为球磨过程中球与球的猛烈撞击引发了初始ＴｉＣ的形成，其巨大的生成热诱发了后续反应。

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

The combustion reaction was observed during mechanical alloying Ni_(20)Ti_(50)C_(30), 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.