The Mechanisms of Combustion and Continuous Reactions during Mechanical Alloying

✍ Scribed by N.J. Calos; J.S. Forrester; G.B. Schaffer

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 346 KB
• Volume: 158
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9107

✦ Synopsis

Some materials exhibit a combustion event during mechanical alloying, which results in the rapid transformation of reactants into products, while others show a slow transformation of reactants into products. In this paper, the continuous W ؉ CPWC reaction is compared to the Ti ؉ CPTiC combustion reaction. Rietveld re5nement of X-ray di4raction patterns is used to show that these particular reactions proceed through di4erent pathways, determined by crystallographic factors of the reactants. When a crystallographic relationship exists between the reactants and the products, such as that between W and WC, the product forms slowly over a period of time. In contrast, insertion of C into the Ti structure is associated with atomic rearrangements within the crowded lattice planes and the subsequent catastrophic failure of the reactant lattices results in combustion to form TiC.