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Precipitation in a Cu-30 Pct Ni-1 Pct Nb alloy

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Abstract

Decomposition of a Cu-30 pct Ni-1 pct Nb alloy on aging in the range of 866 K (600°C) to 1073 K (800°C) was investigated. The initial decomposition, concomitant with age hardening, occurred through the precipitation of body centered tetragonal metastable Ni3Nb-γ” precipitates on the 100 matrix planes. Equilibrium orthorhombicβ phase formed either through a grain boundary cellular reaction at low temperature (≤973 K (700°C)) or as Widmanstaettenplatelets on the 1ll planes at higher temperatures (≥1073 K (800°C)) with the following crystallographic relationship: (0l0)β//111γ [100]β//[1•11]γ. Based on the observations, a schematic transformation sequence is presented.

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  1. Metals Research Laboratories, Olin Corporation, 91 Shelton Avenue, 06511, New Haven, CT

    M. Raghavan (Engineering Specialist)

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  1. M. Raghavan
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Raghavan, M. Precipitation in a Cu-30 Pct Ni-1 Pct Nb alloy. Metall Trans A 8, 1071–1078 (1977). https://doi.org/10.1007/BF02667392

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