Precipitation structure and mechanical properties on peak-aged Al-Zn-Mg alloys including different with some zn/mg ratios

Seungwon Lee; Katsumi Watanabe; Kenji Matsuda; Katsuhiko Nishimura; Norio Numomura; Hiroyuki Toda; Kyosuke Hirayama; Kazuyuki Shimizu; Hongye Gao; Masatake Yamaguchi; Kenichi Ebihara; Mitsuhiro Itakura; Tomohito Tsuru; Tomoo Yoshida; Satoshi Murakami; Susumu Ikeno

doi:10.2464/jilm.67.162

Precipitation structure and mechanical properties on peak-aged Al-Zn-Mg alloys including different with some zn/mg ratios

Seungwon Lee, Katsumi Watanabe, Kenji Matsuda, Katsuhiko Nishimura, Norio Numomura, Hiroyuki Toda, Kyosuke Hirayama, Kazuyuki Shimizu, Hongye Gao, Masatake Yamaguchi, Kenichi Ebihara, Mitsuhiro Itakura, Tomohito Tsuru, Tomoo Yoshida, Satoshi Murakami, Susumu Ikeno

Materials Design and Engineering

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	162-167
Number of pages	6
Journal	Keikinzoku/Journal of Japan Institute of Light Metals
Volume	67
Issue number	5
DOIs	https://doi.org/10.2464/jilm.67.162
State	Published - 2017

Keywords

Age-hardening
Aluminum-zinc-magnesium alloy
Precipitation
Transmission electron microscopy
Zn/Mg ratio

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.2464/jilm.67.162

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Lee, S., Watanabe, K., Matsuda, K., Nishimura, K., Numomura, N., Toda, H., Hirayama, K., Shimizu, K., Gao, H., Yamaguchi, M., Ebihara, K., Itakura, M., Tsuru, T., Yoshida, T., Murakami, S., & Ikeno, S. (2017). Precipitation structure and mechanical properties on peak-aged Al-Zn-Mg alloys including different with some zn/mg ratios. Keikinzoku/Journal of Japan Institute of Light Metals, 67(5), 162-167. https://doi.org/10.2464/jilm.67.162

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title = "Precipitation structure and mechanical properties on peak-aged Al-Zn-Mg alloys including different with some zn/mg ratios",

abstract = "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.",

keywords = "Age-hardening, Aluminum-zinc-magnesium alloy, Precipitation, Transmission electron microscopy, Zn/Mg ratio",

author = "Seungwon Lee and Katsumi Watanabe and Kenji Matsuda and Katsuhiko Nishimura and Norio Numomura and Hiroyuki Toda and Kyosuke Hirayama and Kazuyuki Shimizu and Hongye Gao and Masatake Yamaguchi and Kenichi Ebihara and Mitsuhiro Itakura and Tomohito Tsuru and Tomoo Yoshida and Satoshi Murakami and Susumu Ikeno",

year = "2017",

doi = "10.2464/jilm.67.162",

language = "英語",

volume = "67",

pages = "162--167",

journal = "Keikinzoku/Journal of Japan Institute of Light Metals",

issn = "0451-5994",

publisher = "Keikinzoku Gakkai/Japan Institute of Light Metals",

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Lee, S, Watanabe, K, Matsuda, K, Nishimura, K, Numomura, N, Toda, H, Hirayama, K, Shimizu, K, Gao, H, Yamaguchi, M, Ebihara, K, Itakura, M, Tsuru, T, Yoshida, T, Murakami, S & Ikeno, S 2017, 'Precipitation structure and mechanical properties on peak-aged Al-Zn-Mg alloys including different with some zn/mg ratios', Keikinzoku/Journal of Japan Institute of Light Metals, vol. 67, no. 5, pp. 162-167. https://doi.org/10.2464/jilm.67.162

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.

KW - Age-hardening

KW - Aluminum-zinc-magnesium alloy

KW - Precipitation

KW - Transmission electron microscopy

KW - Zn/Mg ratio

UR - http://www.scopus.com/inward/record.url?scp=85021793008&partnerID=8YFLogxK

U2 - 10.2464/jilm.67.162

DO - 10.2464/jilm.67.162

M3 - 学術論文

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 -

Precipitation structure and mechanical properties on peak-aged Al-Zn-Mg alloys including different with some zn/mg ratios

Abstract

Keywords

ASJC Scopus subject areas

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