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 .

PDF mat_cha_202_2023.pdf - Published Version Restricted to Registered users only Download (4MB) | Request a copy

Abstract

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

Actions (login required)

View Item