open access

https://hdl.handle.net/2115/80403

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

日本語

grain boundary character

2021-02-10

Japan Institute Metals and Materials

Journal of the Japan institute of metals and materials

85(1)

7-16

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 180t under-aged sample, the nano-hardness near GB is higher than that far from GB, while 1801 peak-aged and 250t aged samples, the nano-hardness is tower 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.

学術雑誌論文

Version of Record

0021-4876