通过纳米W-Mg3RE2Zn3相在LPSO结构中的增韧作用，实现Mg-Gd-Y-Zn-Al合金的强度-塑性协同作用

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-08-19 DOI:10.1016/j.scriptamat.2025.116938

Yinyuan Chen , Huan Liu , Xiaoyu Qin , Ziwei Yuan , Chao Sun , Yuna Wu , Kai Yan , Jia Ju , Jinghua Jiang , Jing Bai

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引用次数: 0

摘要

通过对Mg-1Gd-6.7Y-2.5Zn-1Al合金进行热挤压前的LPSO预扭结（4道ECAP）处理，成功获得了纳米w相（Mg3RE2Zn3）相，这些相不仅分布在α-Mg晶粒内，而且嵌入在LPSO相中。4P+HE合金表现出了超高的强度（493.9±5.1 MPa）和延伸率（8.9±0.5%，比直接HE合金提高了41%），这可归因于纳米w相有效地抑制了裂纹向α-Mg基体扩展，并将应力集中到脆性Al2RE颗粒上。本研究通过LPSO/ w相相互作用和异质结构设计证明了一种协同增韧强化机制，为高性能镁合金提供了一种新的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Achieving strength-ductility synergy in Mg-Gd-Y-Zn-Al alloy via toughening effect of nano-sized W-Mg3RE2Zn3 phases within LPSO structures

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Achieving strength-ductility synergy in Mg-Gd-Y-Zn-Al alloy via toughening effect of nano-sized W-Mg3RE2Zn3 phases within LPSO structures

By implementing an LPSO pre-kinking strategy (4 passes of ECAP) prior to hot extrusion (HE) in Mg-1Gd-6.7Y-2.5Zn-1Al alloy, nano-sized W-phase (Mg₃RE₂Zn₃) precipitates were successfully obtained, not only distributed within the α-Mg grains but also embedded within the LPSO phases. The 4P+HE alloy exhibited ultra-high strength (493.9 ± 5.1 MPa) and enhanced elongation (8.9 ± 0.5 %; a 41% increase compared to the direct HE counterpart), which can be attributed to the nano-sized W-precipitates effectively suppressing cracks propagate into the α-Mg matrix and redirecting stress concentration to brittle Al₂RE particles. This work demonstrates a synergistic toughening-strengthening mechanism through LPSO/W-phase interaction and heterostructure design, offering a novel strategy for high-performance Mg alloys.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.