Decomposition and Crystallization of Intermetallics by High-Energy Mechanical Milling(Synthesis and Processing,<Special Issue>Guest Editors Dedicated to Prof. Gunter Petzow: Modern Trends in Advanced Ceramics)

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Structural transformations induced by high-energy ball-milling were studied in this work. It was found that amorphous Fe_<90>Zr_<10> ribbons undergo crystallization into BCC α-Fe(Zr) under milling in a high-energy planetary ball-mill. Analyses of samples milled at different speeds suggested that the observed crystallization is a deformation-induced process rather than a thermally induced one. In addition, milling-induced structural transformations of CoSn and CoIn_2 intermetallics were studied. High-energy milling led to the decomposition of the CoSn phase into the high-temperature polymorph of Co_3Sn_2 and Sn (Co), whereas no evidence of the decomposition of CoIn_2 was found. These results may be attributed to high local stress during ball collisions which may make only those decomposition processes favorable, with which negative volume changes are associated.
社団法人日本セラミックス協会の論文
2006-11-01