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Phase transformations in an ultralight BCC Mg alloy during anisothermal ageing
Univ New South Wales, Australia.
Nanjing Univ Sci & Technol, Peoples R China.
Univ New South Wales, Australia.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-0123-1164
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2022 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 239, article id 118248Article in journal (Refereed) Published
Abstract [en]

Mg-Li-Al alloys with a body-centred cubic (BCC) structure can exhibit exceptional specific strengths in combination with excellent ductility and corrosion resistance. In general, the strength of these alloys is very sensitive to the processing temperature due to the occurrence of various phase transformations. Although different phases have been identified in these alloys, their corresponding transformation mechanisms and unique role played in controlling the mechanical properties have never been studied in depth. In this work, we identified the phase transformation sequence by in-situ synchrotron X-ray diffraction. Moreover, we investigated the evolution of precipitation and their morphology using transmission and scanning electron microscopy, together with simulations based on the phase field modelling and first-principles calculations. Phase transformation sequence of Al-rich zone?->?theta (D0(3)(-)Mg(3)Al)?->?AlLi was confirmed during anisothermal ageing. A braided structure resulting from spinodal decomposition was found to be the optimized microstructure for achieving the peak strength. Nanocrystalline alpha-Mg phase at the interface between theta and the matrix was identified as the main reason for softening in the alloy. The core-shell model for theta?->?AlLi transformation is observed and verified. Our findings deepen the understanding of BCC Mg-Li-Al alloys and pave a pathway to develop new generation of ultralight alloys with stronger strength and better stability. (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD , 2022. Vol. 239, article id 118248
Keywords [en]
Phase transformations; Mg alloys
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-189061DOI: 10.1016/j.actamat.2022.118248ISI: 000861076600005OAI: oai:DiVA.org:liu-189061DiVA, id: diva2:1702258
Note

Funding Agencies|Australian Research Council (ARC); ARC Discovery scheme [DP190103592]; National Natural Science Foundation of China [52101142]; Natural Science Foundation of Jiangsu Province [BK20200503]; Chinese Scholarship Council (CSC)

Available from: 2022-10-10 Created: 2022-10-10 Last updated: 2023-12-28

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