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

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  • Hashimoto Takuya
    Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University
  • Ikeda Ken-ichi
    Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University
  • Miura Seiji
    Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University

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  • Al-Mg-Si系合金の析出挙動・局所力学挙動に及ぼす粒界性格の影響
  • Al-Mg-Siケイ ゴウキン ノ セキシュツ キョドウ ・ キョクショ リキガク キョドウ ニ オヨボス リュウカイ セイカク ノ エイキョウ

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Abstract

<p>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℃ under-aged sample, the nano-hardness near GB is higher than that far from GB, while 180℃ peak-aged and 250℃ 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.</p>

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