Abnormal grain growth in friction stir–processed Al–Mg–Zn–Sc alloys

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-10-03 DOI:10.1016/j.matchar.2025.115624

J.C. Xie, C.Y. Liu, Q.J. Li, Y.L. Sun

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Abstract

This study investigates the grain coarsening behavior of fine-grained Al–7 Mg–xZn–0.25Sc alloys manufactured by friction stir processing (FSP) during solid solution treatment. The FSP alloys containing Zn ≤3 wt% demonstrated excellent thermal stability of their grain structure during heating. However, when the Zn content increased to 5 wt%, abnormal grain growth (AGG) was observed in both the top and bottom regions of the low-heat-input FSP alloy after 88 s of heat treatment, followed by rapid propagation of coarse grains toward the central region within the next 100 s. The grain structure showed stabilization tendencies after 180 s of thermal exposure. While, increasing heat input can delay grain coarsening, or even completely inhibit AGG in the FSP Al–7 Mg–5Zn–0.25Sc alloy during heat treatment. The AGG phenomenon in the top and bottom regions can be attributed to the initial grain size was significantly smaller than the critical grain size (∼1.8 μm) required to inhibit grain boundary migration, as predicted by the Humphreys model‌. ‌Grain growth is also governed by the size and dissolution kinetics of secondary T phases within the alloy system.

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摩擦搅拌Al-Mg-Zn-Sc合金的异常晶粒生长

研究了搅拌摩擦加工（FSP）制备的al - 7mg - xzn - 0.25 sc细晶合金在固溶过程中的晶粒粗化行为。含Zn≤3wt %的FSP合金在加热过程中表现出良好的晶粒结构热稳定性。然而，当Zn含量增加到5 wt%时，热处理88 s后，低热输入FSP合金的顶部和底部都出现了异常晶粒生长（AGG），在接下来的100 s内，粗晶粒向中心区域快速扩展。热暴露180s后，晶粒结构呈现稳定化趋势。而增加热输入可以延缓Al-7 Mg-5Zn-0.25Sc合金在热处理过程中的晶粒粗化，甚至完全抑制AGG。顶部和底部区域的AGG现象可以归因于初始晶粒尺寸明显小于抑制晶界迁移所需的临界晶粒尺寸（~ 1.8 μm），正如Humphreys模型预测的那样。合金体系中次生T相的大小和溶解动力学也决定了晶粒的长大。

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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.