Synergistic enhancement of high-temperature oxidation resistance in lightweight AlFeCrMnTi high-entropy alloy via BCC phase and L21 nano-coherent precipitates

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-10 DOI:10.1016/j.matchar.2025.115033

Lipeng Shao , Xuecheng Jin , Hao Li , Wei Zhang , Jiayi Xu , Wei Wei , Jing Hu , Wenfeng Yang , Wenwen Sun , Xulong An

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引用次数: 0

Abstract

This study investigates the high-temperature oxidation behavior of a lightweight, non-equiatomic AlFeCrMnTi high-entropy alloy (LWHEA) with a density of 6.29 g/cm³. The alloy exhibits a dual-phase microstructure consisting of a Cr- and Mn-rich BCC matrix and L2₁(Fe₂AlTi) nano-precipitates. High-temperature cyclic oxidation tests at 700 °C, 800 °C, and 900 °C reveal superior oxidation resistance, with parabolic rate constants of 2.10 × 10⁻⁸ mg²·cm⁻⁴·s⁻¹ and 1.02 × 10⁻⁷ cm⁻⁴·cm cm⁻⁴·s⁻¹ at 700 °C and 800 °C, respectively. At 900 °C, the oxidation rate increases due to the formation of MnO₂ impurities, which compromise the protective Al₂O₃ oxide layer. The exceptional oxidation resistance at lower temperatures is attributed to the synergistic interaction between the BCC phase and L2₁ precipitates, which promote the formation of a dense and continuous Al₂O₃ film. This work provides a comprehensive model for enhancing oxidation resistance in lightweight high-entropy alloys through microstructure optimization, offering significant economic and performance benefits for high-temperature applications.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.