Laves phase fields in Cr–Zr–Nb and Cr–Zr–Hf alloy systems

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The phase fields of the Laves phase in the Cr–Zr–Nb and Cr–Zr–Hf alloy systems were investigated at 1573 K. The Laves phase formed in the Cr–Zr–Nb alloy system had a broad off-stoichiometric range in the center of ZrCr2–NbCr2 pseudo-binary line, while the Laves phase formed in the Cr–Zr–Hf alloy system had a uniform and limited off-stoichiometric range along ZrCr2–HfCr2 pseudo-binary line. The results are discussed, in terms of geometric concept of atomic sizes of the constituent atoms.

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