Effect of High-Speed Impact Compression on Natural Aging and Subsequent Artificial Aging of a 6061 Aluminum Alloy

Tomo Ogura; Keitaro Horikawa; Yuki Kitani; Mami Miara; SeongNyeong Kim; Equo Kobayashi; Tatsuo Sato; Hidetoshi Kobayashi

doi:10.2320/matertrans.L-M2016819

Tomo Ogura, Keitaro Horikawa, Yuki Kitani, Mami Miara, SeongNyeong Kim, Equo Kobayashi, Tatsuo Sato, Hidetoshi Kobayashi

Author information

Tomo Ogura
Division of Materials and Manufacturing Science, Osaka University
Keitaro Horikawa
Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University
Yuki Kitani
Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University
Mami Miara
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
SeongNyeong Kim
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
Equo Kobayashi
Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology
Tatsuo Sato
Precision and Intelligence Laboratory, Tokyo Institute of Technology
Hidetoshi Kobayashi
Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University

Keywords: aluminum-magnesium-silicon alloy, point defects, vacancy, high-speed deformation, age-hardening

JOURNAL FREE ACCESS

2016 Volume 57 Issue 8 Pages 1282-1286

DOI https://doi.org/10.2320/matertrans.L-M2016819

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Abstract

The effect of high-speed impact compression on natural aging and subsequent artificial aging of a 6061 aluminum alloy was investigated using Micro-Vickers hardness test, differential scanning calorimetry (DSC) analysis and transmission electron microscopy (TEM). The suppression of natural age-hardening was clearly seen in the alloy with high-speed impact compression. TEM observation showed that fine β” precipitates was formed during artificial aging even after high-speed impact compression and natural aging. Maximum hardness of the peak-aged alloys with high-speed compression was almost the same as that without natural aging, showing that negative effect of two step aging was almost overcome by high-speed impact compression.

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