TY - JOUR
T1 - Precipitation structure and mechanical properties on peak-aged Al-Zn-Mg alloys including different with some zn/mg ratios
AU - Lee, Seungwon
AU - Watanabe, Katsumi
AU - Matsuda, Kenji
AU - Nishimura, Katsuhiko
AU - Numomura, Norio
AU - Toda, Hiroyuki
AU - Hirayama, Kyosuke
AU - Shimizu, Kazuyuki
AU - Gao, Hongye
AU - Yamaguchi, Masatake
AU - Ebihara, Kenichi
AU - Itakura, Mitsuhiro
AU - Tsuru, Tomohito
AU - Yoshida, Tomoo
AU - Murakami, Satoshi
AU - Ikeno, Susumu
PY - 2017
Y1 - 2017
N2 - Al-Zn-Mg alloys with different ratios of Zn/Mg have been investigated to understand the influence of the Zn/Mg ratios on age-hardening, microstructures and precipitates. Alloys containing higher ratios of Zn to Mg revealed higher peak hardness, ultimate tensile strengths, 0.2% proof stresses and higher number densities of precipitates per unit area. A square shaped T'-phase has been observed in the matrices of low Zn/Mg ratio alloys aged at 423 K with the aid of transmission electron microscope (TEM) images and its selected area electron diffraction (SAED) patterns, while SAED patterns of η and/or η-phase have been detected in high Zn/Mg ratio alloys. When aging temperature is lowered to 393 K, η'/η-phase have been again observed in the matrix, though no T'-phase was detected in low Zn/Mg ratio alloys. The aging condition in the present work has turned out to be on over aged condition for low Zn/Mg ratio alloys with coarse precipitates of T'-phase in the matrix, because those alloys attained lower peak hardness, tensile strength and higher elongation than high Zn/Mg ratio alloys which have fine η '/η-phase.
AB - Al-Zn-Mg alloys with different ratios of Zn/Mg have been investigated to understand the influence of the Zn/Mg ratios on age-hardening, microstructures and precipitates. Alloys containing higher ratios of Zn to Mg revealed higher peak hardness, ultimate tensile strengths, 0.2% proof stresses and higher number densities of precipitates per unit area. A square shaped T'-phase has been observed in the matrices of low Zn/Mg ratio alloys aged at 423 K with the aid of transmission electron microscope (TEM) images and its selected area electron diffraction (SAED) patterns, while SAED patterns of η and/or η-phase have been detected in high Zn/Mg ratio alloys. When aging temperature is lowered to 393 K, η'/η-phase have been again observed in the matrix, though no T'-phase was detected in low Zn/Mg ratio alloys. The aging condition in the present work has turned out to be on over aged condition for low Zn/Mg ratio alloys with coarse precipitates of T'-phase in the matrix, because those alloys attained lower peak hardness, tensile strength and higher elongation than high Zn/Mg ratio alloys which have fine η '/η-phase.
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U2 - 10.2464/jilm.67.162
DO - 10.2464/jilm.67.162
M3 - Article
AN - SCOPUS:85021793008
SN - 0451-5994
VL - 67
SP - 162
EP - 167
JO - Keikinzoku/Journal of Japan Institute of Light Metals
JF - Keikinzoku/Journal of Japan Institute of Light Metals
IS - 5
ER -