Influence of microstructure uniformity on fracture behavior of magnesium alloy rolling sheet based on slip trace analysis

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-04-01 DOI:10.1016/S1003-6326(24)66738-5

Jing TIAN , Jia-fei DENG , Wei LIANG , Xi ZHAO , Xiao-gang WANG

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引用次数: 0

Abstract

The nonuniform microstructure of magnesium alloy rolled sheets tends to influence their plastic deformation capacity. This study employed multi-pass restricted rolling to successfully prepare AZ31 magnesium alloy rolled sheets with a uniform microstructure, enhancing their mechanical properties. Quasi-in-situ tensile EBSD was used to investigate the effect of microstructure uniformity on the plastic deformation and fracture behavior of magnesium alloy. The results demonstrate that the nonuniformity of the magnesium alloy microstructure intensifies the strain asynchrony between adjacent grains, leading to relative misalignment and crack formation. Fine grains cannot coordinate the strain within their adjacent coarse grains, resulting in ledge formation at their common grain boundaries. Moreover, low-angle grain boundaries (LAGB) influence fracture behavior, rendering fine grains penetrated by LAGB more susceptible to becoming strain concentration areas that promote intergranular fracture and even transgranular fracture.

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基于滑移痕迹分析的镁合金轧制板显微组织均匀性对断裂行为的影响

镁合金轧制薄板组织的不均匀性会影响其塑性变形能力。本研究采用多道次限制轧制方法成功制备了组织均匀的AZ31镁合金轧制板材，提高了AZ31镁合金的力学性能。采用准原位拉伸EBSD研究了镁合金组织均匀性对塑性变形和断裂行为的影响。结果表明：镁合金组织的不均匀性加剧了相邻晶粒之间的应变不同步，导致相对错向和裂纹的形成；细晶不能在相邻的粗晶内协调应变，导致在共同晶界处形成棱壁。低角晶界（LAGB）影响断裂行为，使被LAGB穿透的细晶粒更容易成为应变集中区，促进晶间断裂甚至穿晶断裂。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.