Enhanced phase stability and mechanical properties of Mg-Al-based lightweight complex concentrated alloys

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-09-16 DOI:10.1016/j.intermet.2025.109001

Quan Dong , Yufei Zhang , Yuhao Chen , Qian Shangguan , Chengyu Peng , Jing Zhang

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Abstract

In this work, three Mg-rich lightweight complex concentrated alloys (LW-CCAs) with Al density classes, i.e., Mg_77.5Al_12.5Li₅Zn_2.5Cu_2.5 (at.%), Mg₇₉Al_13.5Zn₃Cu₃Mn₁Ce_0.5 (at.%), and Mg₈₀Al₈Zn₇Gd_2.5Y_2.5 (at.%), have been designed according to the thermodynamic empirical guidelines and synthesized via a combination of mechanical alloying (MA) and cold-press sintering (CPS). The effects of composition and heat-treatment temperature on the microstructures and mechanical properties of LW-CCAs were analyzed. The results suggest that the microstructures of the as-milled Mg_77.5Al_12.5Li₅Zn_2.5Cu_2.5 and Mg₇₉Al_13.5Zn₃Cu₃Mn₁Ce_0.5 LW-CCAs predominantly consist of an HCP phase, while the as-milled Mg₈₀Al₈Zn₇Gd_2.5Y_2.5 LW-CCA exhibits only a single HCP structure. The LW-CCAs undergos distinct phase transformation with the precipitation of intermetallics after CPS. The Mg₈₀Al₈Zn₇Gd_2.5Y_2.5 LW-CCA has the highest phase stability as affected by the T_m, Δχ, ΔH_mix, and ΔG_mix parameters. Moreover, the as-milled LW-CCAs exhibit high hardness features owing to the combined result of fine grain effect, solid solution effect, and dislocation effect, among which the Mg₈₀Al₈Zn₇Gd_2.5Y_2.5 alloy possess the highest hardness of 1.53 GPa. The Mg₈₀Al₈Zn₇Gd_2.5Y_2.5 alloy sintered at 400°C exhibits excellent hardness and specific hardness, reaching 164.7 HV and 74.2 HV·cm³·g⁻¹, respectively.

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mg - al基轻质复合浓缩合金的相稳定性和力学性能增强

在本研究中，三种具有Al密度等级的富mg轻质复合浓缩合金（LW-CCAs），即Mg77.5Al12.5Li5Zn2.5Cu2.5 (at。%), Mg79Al13.5Zn3Cu3Mn1Ce0.5 (at。%), Mg80Al8Zn7Gd2.5Y2.5 (at。%)，根据热力学经验准则设计，并通过机械合金化（MA）和冷压烧结（CPS）相结合的方法合成。分析了成分和热处理温度对LW-CCAs显微组织和力学性能的影响。结果表明，Mg77.5Al12.5Li5Zn2.5Cu2.5和Mg79Al13.5Zn3Cu3Mn1Ce0.5 LW-CCA的显微组织主要由HCP相组成，而Mg80Al8Zn7Gd2.5Y2.5 LW-CCA的显微组织仅为单一HCP相。CPS后LW-CCAs发生了明显的相变，析出了金属间化合物。受Tm、Δχ、ΔHmix和ΔGmix参数的影响，Mg80Al8Zn7Gd2.5Y2.5 LW-CCA具有最高的相稳定性。此外，由于细晶效应、固溶效应和位错效应的共同作用，铣削后的LW-CCAs具有较高的硬度特征，其中Mg80Al8Zn7Gd2.5Y2.5合金的硬度最高，达到1.53 GPa。400℃烧结Mg80Al8Zn7Gd2.5Y2.5合金具有优异的硬度和比硬度，分别达到164.7 HV和74.2 HV·cm3·g−1。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.