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Diffusion-controlled growth mechanism of phases and the microstructural evolution in the Ni-Zn system

Bansal, U and Thakur, AK and Baheti, VA and Singh, SB and Mondal, A and Halder, AK and Chakraborty, A and Chattopadhyay, K and Paul, A (2023) Diffusion-controlled growth mechanism of phases and the microstructural evolution in the Ni-Zn system. In: Materials Characterization, 202 .

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Official URL: https://doi.org/10.1016/j.matchar.2023.112982


The diffusion-controlled growth mechanism of the phases and microstructural evolution in correlation to estimated diffusion coefficients are described in solid Ni-solid Zn and solid Ni-liquid Zn diffusion couples that mimic the hot-dip galvanization of Ni pre-coated steel. Contrary to earlier belief, the location of the Kirkendall marker plane is detected not at the δ-NiZn8/Zn interface but inside the δ-NiZn8 phase indicating the role of both the diffusing elements Ni and Zn on the evolution of duplex morphology in this phase. Further, the growth of γ1-NiZn3, and γ-Ni2Zn11 phase layers with distinct microstructures are identified contrary to the belief that there is only one intermediate phase γ-Ni2Zn11 over this composition range. This study explains the role of relative mobilities of the elements behind the characteristic microstructural evolution in this system of technological importance.

Item Type: Journal Article
Publication: Materials Characterization
Publisher: Elsevier Inc.
Additional Information: The copyright for this article belongs to Elsevier Inc.
Keywords: Binary alloys; Microstructural evolution; Morphology; Zinc alloys, Coated steel; Composition ranges; Diffusing elements; Diffusion controlled growth mechanisms; Diffusion couple; Hot dip galvanization; Intermediate phasis; Kirkendall; Kirkendall effects; Phase layers, Diffusion
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 14 Jun 2023 13:22
Last Modified: 14 Jun 2023 13:22
URI: https://eprints.iisc.ac.in/id/eprint/81933

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