Effect of Grain Boundary Characters on Precipitation Behavior and Local Deformation Behavior in Al–Mg–Si Alloy

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Transactions Pub Date : 2023-08-01 DOI:10.2320/matertrans.mt-m2022217

Takuya Hashimoto, Ken-ichi Ikeda, Seiji Miura

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Abstract

Nanoindentation tests were conducted near the grain boundary (GB) of the Al–Mg–Si alloy, and the influence of GB character on the aging precipitation behavior and the mechanical properties was confirmed. After obtaining the GB characters by electron back scattered diffraction (EBSD) analysis and nanoindentation tests were carried out on under-aged, peak-aged, and over-aged samples. And then, the indentation areas were observed by back scattered electrons imaging (BSE) in order to identify indentation positions to the GB. In this study, for the GB character, focusing on the rotation angle, the high-angle GB (HAGB) and the low-angle GB (LAGB) were selected. In addition, coincidence site lattice GBs (CSL) were selected as the special GB. In the 180°C under-aged sample, the nano-hardness near GB is higher than that far from GB, while 180°C peak-aged and 250°C aged samples, the nano-hardness is lower than that far from GB. Then the amount of change in hardness of HAGB was larger than that of the LAGB. This suggests that the GB character affects the aging precipitation behavior and mechanical properties.

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Al-Mg-Si合金晶界特征对析出行为和局部变形行为的影响

在Al-Mg-Si合金晶界附近进行了纳米压痕试验，验证了晶界特征对合金时效析出行为和力学性能的影响。通过电子背散射衍射(EBSD)分析和纳米压痕测试，获得了未成熟、峰成熟和过成熟样品的GB特征。然后，通过背散射电子成像(BSE)观察压痕区域，以确定压痕位置。本研究以旋转角度为重点，选取了高角度GB (HAGB)和低角度GB (LAGB)。此外，选择符合点晶格GB (CSL)作为特殊GB。在180℃欠时效样品中，近GB的纳米硬度高于远离GB的纳米硬度，而180℃峰时效和250℃时效样品的纳米硬度低于远离GB的纳米硬度。HAGB的硬度变化量大于LAGB。说明GB字符影响了合金的时效析出行为和力学性能。

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