Please use this identifier to cite or link to this item:
http://bura.brunel.ac.uk/handle/2438/31523
Title: | A generic Hall-Petch relationship in metallic materials with varied grain morphology |
Authors: | Keerti, S Yang, X Babu, NH |
Keywords: | Hall-Petch relation;Al binary alloys;eutectic;perimeter;interfacial area |
Issue Date: | 4-Jul-2025 |
Publisher: | Elsevier |
Citation: | Keerti, S., Yang, X. and Babu, N.H. (2025) 'A generic Hall-Petch relationship in metallic materials with varied grain morphology', Materials Science and Engineering: A, 943, 148764, pp. 1- 13. doi: 10.1016/j.msea.2025.148764. |
Abstract: | The Hall-Petch relationship relates the yield strength (YS) of metallic materials to grain diameter (d), but for alloys with dendritic grains, secondary dendritic arm spacing (λ2) provides a better fit. This manuscript underscores the significance of considering a perimeter-associated parameter (p'), rather than relying solely on d or λ2, to account for strength contribution from morphological changes in various alloys. We propose a generic Hall-Petch relation expressed as σ = σ<inf>o</inf> + k'ʹ/√pʹ, where p' is the area per unit perimeter which can be accurately measured using digital imaging tools and k'ʹ is the Hall-Petch constant. To validate this approach, controlled solidification experiments were conducted on Al-Si and Al-Ce alloys across cooling rates from 0.000167 °C/s to 0.34 °C/s. The degree of primary α-Al grain complexity was manipulated through solute additions (Si or Ce), revealing a nonlinear relationship between λ2 and p', both experimentally and theoretically. This underscores the critical importance of incorporating the perimeter-associated parameter p' as a fundamental strength metric in the Hall-Petch relation. Hardness changes were analysed alongside evolving grain morphologies. Experimental data from various morphologies (facetted, rosette, dendritic) fit more effectively with the proposed generic Hall-Petch relationship than conventional models. |
Description: | Data availability: Data will be made available on request. |
URI: | https://bura.brunel.ac.uk/handle/2438/31523 |
DOI: | https://doi.org/10.1016/j.msea.2025.148764 |
ISSN: | 0921-5093 |
Other Identifiers: | ORCiD: Xinliang Yang https://orcid.org/0000-0002-7657-3759 ORCiD: Nadendla Hari Babu https://orcid.org/0000-0003-4894-7052 Article number: 148764 |
Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
FullText.pdf | Copyright © 2025 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( https://creativecommons.org/licenses/by/4.0/ ). | 13.93 MB | Adobe PDF | View/Open |
This item is licensed under a Creative Commons License