This study concerns a hitherto unknown bcc→fcc allotropic transformation in Nb induced by the mechanical alloying of Nb80Al20. This metastable transformation is preceded by a gradual increase in the lattice parameter of bcc–Nb. The stored excess energy in nanocrystalline bcc–Nb may be responsible for the bcc→fcc phase transition.
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Chatterjee et al. (1999) studied this question.
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