再結晶粒組織を有するAl-Zn-Mg-Cu系合金の結晶粒成長と耐応力腐食割れ特性(<小特集>材料・構造の衝撃問題)

概要

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The stress corrosion cracking, SCC, resistance of recrystallized Al-Zn-Mg-Cu system alloys having various grain size was discussed on the basis of SCC tests of the relationship between SCC failure time and average grain size, d_s, in 3.5% NaCl solution, fractography, then microscopic- and X-ray observations of the recrystallized structure formation. The main results obtained in this work are as follows : (1) SCC resistance in the present 7475 aluminum alloy depended on the behavior of the grain growth. Time to SCC failure reached a peak at d_s=24.1 μm, when d_s> or d_s<24.1 μm ; these times were shorter than that of d_s=24.1 μm. (2) SCC fracture pattern in this alloy was intergranular fracture by hydrogen embrittlement. (3) The behavior of recrystallization and grain growth in this alloy became clear from observations of the texture structure formation by X-ray, and the secondary recrystallized texture structure formation of the <112> direction was peculiar to an aluminum alloy start at d_s=24.1 μm. Therefore, SCC resistance in this alloy has been found to be related to the secondary recrystallization behavior.
社団法人日本機械学会の論文
1997-12-25