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Microstructure evolution in a hydrogen charged and aged Al-Zn-Mg alloy

水素チャージ時効Al-Zn-Mg合金における微細構造の発達

Bendo, A.*; 松田 健二*; Lee, S.*; 西村 克彦*; 戸田 裕之*; 清水 一行*; 都留 智仁   ; 山口 正剛   

Bendo, A.*; Matsuda, Kenji*; Lee, S.*; Nishimura, Katsuhiko*; Toda, Hiroyuki*; Shimizu, Kazuyuki*; Tsuru, Tomohito; Yamaguchi, Masatake

Microstructure evolution of alloy with composition Al-3.4Zn-1.9 Mg (at. %) was tracked using high resolution imaging and electron diffraction during ageing at 120 C after being initially natural aged for 4 days. Hydrogen was charged in microstructure by cutting samples in Electrical Discharge Machine immediately after being quenched from solid solution temperature. Transmission Electron Microscope observations revealed a higher presence of high aspect ratio GPII-zones in microstructure of hydrogen charged and aged samples. Correlation was made with previously reported hydrogen effect into vacancy formation.

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