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Abstract: Iron--rich solid solutions with Tantalum were prepared by mechanical alloying. At low Ta concentrations the alloys form a crystalline solid solution with bcc structure. At higher contents additionally an amorphous phase appears. The phases and their contents were determined by X-ray diffraction and Mößbauer spectroscopy. The thermal stability of the supersaturated solid solutions was investigated by DSC measurements. The solid solutions are found to precipitate an amorphous phase before transforming into the equilibrium phases. The results are compared with known thermodynamic data. They show that the phase formation in these systems during milling can be described by the polymorphous phase transition rather than by a metastable phase equilibrium.

Article in the Online Archive of the AIP