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Kinetics and Grain Boundary Selectivity of Discontinuous Precipitation in Binary Ni-Cr Alloy

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Abstract

A supersaturated Ni-Cr alloy (42 wt pct Cr) was subjected to a series of aging heat treatments in the two-phase region in the temperature range of 923 K to 1123 K (650 °C to 850 °C) for different time periods. The resultant microstructures were seen to be composed of varying volume fractions of continuous (CP) and discontinuous precipitation (DP). The DP dominated at lower temperatures, while CP dominated at higher temperatures and the expected DP termination temperature was estimated to be 1138 K (865 °C). The kinetics of DP followed the Turnbull model at lower temperatures and the Aaronson–Liu model at higher temperatures. The nucleation and growth of DP cells, which occurred via the ‘precipitate driven grain boundary migration,’ was seen to be a strong function of the nature of the participating grain boundaries.

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Authors and Affiliations

  1. Mechanical Metallurgy Division, Materials Group, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India

    N. Keskar, A. K. Pattanaik, K. V. Mani Krishna, D. Srivastava & G. K. Dey

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  1. N. Keskar
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  2. A. K. Pattanaik
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  3. K. V. Mani Krishna
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Manuscript submitted October 5, 2016.

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Keskar, N., Pattanaik, A.K., Mani Krishna, K.V. et al. Kinetics and Grain Boundary Selectivity of Discontinuous Precipitation in Binary Ni-Cr Alloy. Metall Mater Trans A 48, 3096–3107 (2017). https://doi.org/10.1007/s11661-017-4066-1

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