Relationship between mechanical properties and age-hardening behavior around grain boundaries of Al-Mg-Si alloy
Relationship between mechanical properties and age-hardening behavior around grain boundaries of Al-Mg-Si alloy
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DOI：
10.1051/matecconf/202032603002
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发表时间：
2020
影响因子：
--
通讯作者：
T. Hashimoto;K. Ikeda;S. Miura
中科院分区：
文献类型：
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作者：
T. Hashimoto;K. Ikeda;S. Miura
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）分析得到样品的GB特征后，对未老化、峰老化和过老化样品进行了纳米压痕测试。然后，通过背散射电子成像（BSE）观察压痕区域，以确定相对于GB的压痕位置。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）。另外，选择重合点阵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℃峰时效样品的纳米硬度低于远离GB的纳米硬度。在GB附近，HAGB的硬度变化幅度大于LAGB和CSL3。说明GB字符影响了合金的时效析出行为和力学性能。
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, 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 with respect 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, coincident site lattice GBs (CSL) were selected as the special GB. In the 180°C under-aged samples, the nano-hardness near GB is higher than that far from GB, while 180°C peak-aged samples, the nano-hardness is lower than that far from GB. Then the range near the GB where the hardness changes was larger at HAGB than at LAGB and CSL3. This suggests that the GB character affects the aging precipitation behavior and mechanical properties.