Cryorolling-induced uniform dislocation distribution and solute regulation enhance strength-plasticity of crossover Al-5.3Mg-4.6Zn-0.5Cu Alloy

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-07-09 DOI:10.1016/j.msea.2025.148769

Zhen Zhang , Gaolei Xu , Di Zhang , Liang Zhu , Hongbin Wang , Jishan Zhang

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引用次数: 0

Abstract

The longstanding dilemma in developing next-generation ultra-high-strength aluminum alloys lies in achieving an optimal strength-plasticity synergy. This investigation presents a breakthrough using an Al-5.3Mg-4.6Zn-0.5Cu alloy subjected to cryorolling-augmented thermomechanical processing. The cryogenic deformation mechanism induces two critical microstructural modifications: (1) Uniform dislocation networks effectively weaken the <111>∥RD rolling texture intensity, stabilizing work hardening rates during late-stage plastic deformation and thereby enhancing ductility; (2) Enhanced diffusion kinetics facilitate homogeneous precipitate distribution with increased volume fraction during subsequent aging, while optimized solute partitioning directs matrix precipitation evolution from cluster-dominated structures to T''→T′ phase transformations, significantly boosting precipitation strengthening. Through optimized solution treatment followed by 50 % cryorolling and peak aging, we successfully achieved a sheet alloy exhibiting exceptional mechanical properties: 720 MPa ultimate tensile strength with maintained elongation exceeding 10 %.

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冷滚诱导的均匀位错分布和溶质调节提高了交叉Al-5.3Mg-4.6Zn-0.5Cu合金的强度塑性

开发新一代超高强度铝合金的长期难题在于实现最佳的强度-塑性协同效应。本研究提出了Al-5.3Mg-4.6Zn-0.5Cu合金进行冷滚强化热机械加工的突破。低温变形机制诱发了两个关键的微观组织变化：(1)均匀位错网络有效削弱了<；111>；∥RD轧制织构强度，稳定了塑性变形后期的加工硬化速率，从而提高了塑性；(2)在后续时效过程中，随着体积分数的增加，扩散动力学的增强有利于析出相的均匀分布，而优化的溶质分配使基体析出由团簇为主的结构向T”→T’相转变，显著促进了析出强化。通过优化固溶处理，然后进行50%的冷滚和峰值时效，我们成功地获得了具有优异机械性能的板材合金：720 MPa的极限抗拉强度和超过10%的延伸率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.