Effect of Grain Boundary Segregations of Mg Atoms on Mechanical Properties of Ultrafine-Grained Al-Mg-Zr Alloy

IF 2 4区材料科学 Q2 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Physical Mesomechanics Pub Date : 2025-10-17 DOI:10.1134/S1029959924601817

N. V. Skiba, M. Yu. Gutkin, T. S. Orlova

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Abstract

A theoretical model is proposed to describe the micromechanism of plastic deformation in an ultrafine-grained Al-Mg-Zr alloy structured by high-pressure torsion (HPT) with grain boundary segregations of Mg atoms formed during HPT. In the model, plastic deformation is realized due to the emission of lattice dislocations from triple junctions of grain boundaries (GBs), which contain arrays of extrinsic grain boundary dislocations that are pinned by Mg atoms segregated at GBs. These segregations act as obstacles to gliding of extrinsic grain boundary dislocations, thus hindering the formation of dislocation pile-ups near the triple GB junctions and reducing the stress concentration at them, which leads to significant strengthening of the alloy. This model is used to calculate the yield strength of the ultrafine-grained Al-Mg-Zr alloy after HPT and after additional thermomechanical treatment consisting of low-temperature annealing and slight deformation by HPT. An increase in the alloy plasticity due to such thermomechanical treatment is discussed. The proposed model agrees well with the available experimental data.

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Mg原子晶界偏析对Al-Mg-Zr超细晶合金力学性能的影响

提出了一种描述高压扭转（HPT）组织的Al-Mg-Zr超细晶合金塑性变形微观机制的理论模型，该模型在高压扭转过程中形成了Mg原子的晶界偏析。在该模型中，塑性变形是由于晶界三重结（GBs）的晶格位错发射而实现的，其中包含由GBs分离的Mg原子固定的外源晶界位错阵列。这些偏析对晶界外位错的滑动起阻碍作用，从而阻碍了三GB结附近位错堆积的形成，降低了三GB结处的应力集中，从而显著增强了合金的强度。利用该模型计算了超细晶Al-Mg-Zr合金高温热处理后的屈服强度以及高温热处理后低温退火和轻微变形的屈服强度。本文还讨论了这种热处理对合金塑性的提高。该模型与现有的实验数据吻合较好。

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

Physical Mesomechanics Materials Science-General Materials Science

CiteScore

3.50

自引率

18.80%

发文量

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.