X-ray Study on the Formation of Nano-crystallite and Amorphous Phase of Mo-Fe by Ball Milling

概要

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Pure Mo powders are mechanically attrited with a hardened steel vial and balls in an Ar atmosphere to produce nanostructural and amorphous Mo-Fe alloys. A time evolution of the solid state amorphization caused by the attrition is classified into three stages. In the initial stage the crystallite size of Mo decreases down to 10 nm together with the increase in the lattice strain up to 1.8%. Plastic deformation is a dominating cause of the crystallite size reduction. In the next stage, the crystallite size decreases down to a minimum dimension of 5nm. The reduciton of the grain size is accompanied by a decrease in the lattice strain and the solid solutioning of the Fe impurities which are introduced from the vail and balls in the prior stage. The grain size reduction in this stage is interpreted in terms of recovery process of the stored strain. In the final stage where the Fe content in the Mo lattice saturates about 18at%, a transition from the nano-crystallites to an amorphous phase takes place.
社団法人粉体粉末冶金協会の論文
1995-05-15