Extraordinary hardening-by-annealing in bulk ultrafine grained magnesium with ultra-low yttrium addition

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-05-01 DOI:10.1016/j.actamat.2025.121098

Ruixiao Zheng, Maowen Liu, Junping Du, Hongbo Xie, Wu Gong, Yangyang Cheng, Shigenobu Ogata, Nobuhiro Tsuji

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Abstract

Hall-Petch law fails when grains smaller than a critical size (e.g., 10∼30 nm for copper and iron), due to grain boundary (GB) kinetics-dominated plasticity. To enhance strength, improving GB stability is a consideration. However, this often requires a significant amount of alloying elements, posing resource challenges. Additionally, practical fabrication of extremely fine grains is still an issue. In our study, we firstly demonstrate a remarkable hardening-by-annealing phenomenon in magnesium (Mg) with relatively large grain sizes of 0.2∼0.5 μm, even with ultra-low yttrium (Y) addition (<0.3 at.%). We reveal that annealing induces GB segregation/relaxation, effectively limiting the GB kinetics and promoting dislocation-dominated plasticity. Furthermore, the accompanying dislocation annihilation hinders deformation due to dislocation scarcity. As a result, we discovered extraordinary hardening (247% increase in yield strength) in bulk ultrafine grained Mg-Y ultra-dilute alloy. This work offers a promising avenue for developing energy- and resource-efficient sustainable Mg alloys with superior mechanical properties.

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超低钇镁块体超细晶超常退火硬化

当晶粒小于临界尺寸时（例如，铜和铁的10 ~ 30 nm），由于晶界（GB）动力学主导的塑性，Hall-Petch定律失效。为了增强强度，提高GB的稳定性是一个考虑因素。然而，这通常需要大量的合金元素，带来资源挑战。此外，极细颗粒的实际制造仍然是一个问题。在我们的研究中，我们首先证明了具有相对较大晶粒尺寸（0.2 ~ 0.5 μm）的镁（Mg）的显著退火硬化现象，即使在超低钇(Y)添加量（<0.3 at.%）下也是如此。我们发现退火诱导了GB偏析/弛豫，有效地限制了GB动力学并促进了位错主导的塑性。此外，由于位错的稀缺性，伴随的位错湮灭阻碍了变形。结果，我们发现大块超细晶Mg-Y超稀合金异常硬化（屈服强度提高247%）。这项工作为开发具有优异机械性能的能源和资源节能型可持续镁合金提供了一条有希望的途径。

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

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.