Microstructure evolution and precipitate phase growth mechanism of hypereutectoid Al-37Fe-2Er alloy

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-16 DOI:10.1016/j.matchar.2026.116159

Yifan Zhang , Haiyang Hu , Zhongliang Song , Shan Zhang , Wenhui Wu , Wenhui Zhang , Jinshuai Zhang

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Abstract

Rare earth elements are widely used in Al alloy materials due to their ability to optimize the microstructure. The microstructure evolution of the Al-37Fe-2Er alloy and the growth mechanism of the Al₈Fe₄Er precipitate phase were studied via synchrotron X-ray microtomography, confocal laser scanning microscopy and density functional theory calculation. The results show that the microstructure of the Al-37Fe-Er alloy consists of the Al₈Fe₄Er phase, proeutectoid FeAl₂ phase, and the eutectoid structure of FeAl+FeAl₂. The Al₈Fe₄Er phase is formed through three pathways: direct precipitation from the liquid phase, formation from the Fe₅Al₈ phase via massive transformation, and solid-state phase transformation at the front of the eutectoid structure. The Al₈Fe₄Er phase grows along the 〈101〉 direction and the coupling of lattice distortion and elastic strain energy significantly reduce the phase transition potential barrier. The Al₈Fe₄Er phase mainly undergoes massive transformation dominated by short-range diffusion and lattice shear, and has no orientation relationship with the parent phase Fe₅Al₈.

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过共析Al-37Fe-2Er合金组织演变及析出相生长机制

稀土元素由于具有优化组织的能力，在铝合金材料中得到了广泛的应用。通过同步x射线显微断层扫描、激光共聚焦扫描显微镜和密度泛函理论计算，研究了Al-37Fe-2Er合金的显微组织演变和Al8Fe4Er析出相的生长机制。结果表明：Al-37Fe-Er合金的显微组织由Al8Fe4Er相、预共析FeAl2相和FeAl+FeAl2的共析组织组成；Al8Fe4Er相的形成有三种途径：由液相直接析出、由Fe5Al8相大量相变形成、在共析结构前端发生固态相变。Al8Fe4Er相沿< 101 >方向生长，晶格畸变和弹性应变能的耦合显著降低了相变势垒。Al8Fe4Er相主要发生以短程扩散和晶格剪切为主的大规模相变，与母相Fe5Al8无取向关系。

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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.