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Phase equilibria of the ternary Ni-Cr-Zr system and interfacial reactions in the Ni-Cr/Zr couples

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Abstract

The phase equilibria of the ternary Ni-Cr-Zr system and interfacial reactions in the Ni-Cr/Zr couples at 900 °C were determined. Fifty alloys were prepared from pure Ni, Cr, and Zr. The alloys were metallographically analyzed. Both X-ray diffraction and electron-probe microanalysis (EPMA) were carried out for structural identification and compositional analysis of phases formed in these alloys. At 900 °C, the Cr-Ni10Zr7 two-phase region divides the system into two halves. ZrCr2(C14) exists in the Zr-Cr-Ni10Zr7 half, and the ZrCr2 (C15) phase has an extensive ternary solubility. In the Cr-Ni10Zr7-Ni half, except for the Ni7Zr2 phase, most of the binary Zr-Ni compounds are in equilibrium with either Cr or Ni phase. Reaction-couple techniques were used for the interfacial reaction study. The reaction path was Zr/NiZr2/NiZr/Ni10Zr7/Ni21Zr8/Cr/Ni-Cr alloy in the Ni-Cr/Zr couples examined in this study. The results indicate that Ni is the fastest-diffusing species, while Cr is the slowest one.

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Authors and Affiliations

  1. the Department of Chemical Engineering, National Tsing-Hua University, Taiwan 300, Republic of China

    Shyh-Jye Luo (Graduate Student), Chao-Hong Wang (Graduate Student) & Sinn-Wen Chen (Professor)

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  1. Shyh-Jye Luo
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  2. Chao-Hong Wang
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  3. Sinn-Wen Chen
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Luo, SJ., Wang, CH. & Chen, SW. Phase equilibria of the ternary Ni-Cr-Zr system and interfacial reactions in the Ni-Cr/Zr couples. Metall Mater Trans A 33, 995–1002 (2002). https://doi.org/10.1007/s11661-002-0200-8

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  • DOI: https://doi.org/10.1007/s11661-002-0200-8

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