Effect of pre-deformation on microstructure and mechanical properties of a fine-grained 2A97 alloy

IF 2.5 3区工程技术 Q1 MICROSCOPY

Micron Pub Date : 2024-12-25 DOI:10.1016/j.micron.2024.103779

Fengjiao Niu , Zibo Ma , Yixuan Hao , Yajie Guo , Peng Cao

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Abstract

This study investigates the effect of pre-deformation by cold rolling after solution annealing on the microstructure and properties of the fine-grained Al-Li alloy 2A97. Electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to characterize grain boundaries, dislocations, precipitates and calculate their contribution to strength. It is found that the changes in precipitation behavior predominantly account for the enhanced tensile properties observed in the deformed alloys, where yield and tensile strengths are increased by 85 MPa and 63 MPa, respectively. The peak-aged samples without pre-deformation are mainly strengthened by the T₁ phase, δ'/θ'/δ' composite and σ phase. In contrast, deformation of 10 % prior to aging facilitates the precipitation of the T₁ and lath-like S phases while concurrently inhibiting the precipitation of the σ phase and δ'/θ'/δ' composite phases. In addition, for fine-grained alloys, low-angle grain boundaries induce the precipitation of the finer T₁ phase compared to the T₁ phase located inside the grain, which contributes to the good performance of 2A97 alloy.

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预变形对细晶2A97合金组织和力学性能的影响

研究了固溶退火后冷轧预变形对细晶Al-Li合金2A97组织和性能的影响。利用电子背散射衍射（EBSD）、x射线衍射（XRD）和透射电子显微镜（TEM）表征了材料的晶界、位错、析出物，并计算了它们对强度的贡献。结果表明，变形合金的屈服强度和抗拉强度分别提高了85 MPa和63 MPa。未预变形的峰时效试样主要由T1相、δ′/θ′/δ′复合和σ相强化。相比之下，时效前10% %的变形有利于T1相和条状S相的析出，同时抑制了σ相和δ′/θ′/δ′复合相的析出。此外，对于细晶合金，相对于位于晶粒内部的T1相，低角度晶界诱导了更细的T1相的析出，这有助于2A97合金的良好性能。

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

Micron 工程技术-显微镜技术

CiteScore

4.30

自引率

4.20%

发文量

100

审稿时长

31 days

期刊介绍： Micron is an interdisciplinary forum for all work that involves new applications of microscopy or where advanced microscopy plays a central role. The journal will publish on the design, methods, application, practice or theory of microscopy and microanalysis, including reports on optical, electron-beam, X-ray microtomography, and scanning-probe systems. It also aims at the regular publication of review papers, short communications, as well as thematic issues on contemporary developments in microscopy and microanalysis. The journal embraces original research in which microscopy has contributed significantly to knowledge in biology, life science, nanoscience and nanotechnology, materials science and engineering.