軽金属
Online ISSN : 1880-8018
Print ISSN : 0451-5994
ISSN-L : 0451-5994
研究論文
ピーク時効したZn/Mgの異なるAl–Zn–Mg合金における時効析出組織と機械的性質
李 昇原渡邊 克己松田 健二西村 克彦布村 紀男戸田 裕之平山 恭介清水 一行高 紅叶山口 正剛海老原 健一板倉 充洋都留 智仁吉田 朋夫村上 哲池野 進
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2017 年 67 巻 5 号 p. 162-167

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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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© 2017 一般社団法人軽金属学会
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