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2007•The Chinese Journal of Nonferrous MetalsRequires access

Effect of two-step aging treatment on microstructure and mechanical properties of spray-deposited Al-10.8Zn-2.8Mg-1.9Cu alloy

HE Xiao-qing

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Abstract

Al-10.8Zn-2.8Mg-1.9Cu alloy was fabricated by spray atomization and deposition technique.The microstructure and mechanical properties of spray-deposited Al-10.8Zn-2.8Mg-1.9Cu alloy after two-step aging treatment at 110 ℃ and 150 ℃ were investigated using transmission electron microscopy(TEM),high-resolution electron microscopy(HREM) and tensile tests.The results indicate that the GP zones and η′ phase are major precipitates for the alloy under two-step aging condition.The discontinuous grain boundary precipitates are favorable to SCC resistance at over-aged condition,which reduces its ultimate tensile strength and yield strength by about 4.5% and 3.5% compared with those under peak-aged condition,respectively.

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What this paper is about

Al-10.8Zn-2.8Mg-1.9Cu alloy was fabricated by spray atomization and deposition technique.The microstructure and mechanical properties of spray-deposited Al-10.8Zn-2.8Mg-1.9Cu alloy after two-step aging treatment at 110 ℃ and 150 ℃ were investigated using transmission electron microscopy(TEM),high-resolution electron microscopy(HREM) and tensile tests.The results indicate that the GP zones and η′ phase are major precipitates for the alloy under two-step aging condition.The discontinuous grain boundary precipitates are favorable to SCC resistance at over-aged condition,which reduces its ultimate tensile strength and yield strength by about 4.5% and 3.5% compared with those under peak-aged condition,respectively.

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Available abstract

Al-10.8Zn-2.8Mg-1.9Cu alloy was fabricated by spray atomization and deposition technique.The microstructure and mechanical properties of spray-deposited Al-10.8Zn-2.8Mg-1.9Cu alloy after two-step aging treatment at 110 ℃ and 150 ℃ were investigated using transmission electron microscopy(TEM),high-resolution electron microscopy(HREM) and tensile tests.The results indicate that the GP zones and η′ phase are major precipitates for the alloy under two-step aging condition.The discontinuous grain boundary precipitates are favorable to SCC resistance at over-aged condition,which reduces its ultimate tensile strength and yield strength by about 4.5% and 3.5% compared with those under peak-aged condition,respectively.

Key concepts: Materials science, Alloy, Microstructure, Ultimate tensile strength, Transmission electron microscopy, Metallurgy, Spray forming, Grain size

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Effect of two-step aging treatment on microstructure and mechanical properties of spray-deposited Al-10.8Zn-2.8Mg-1.9Cu alloy — Research Paper | ScholarLens