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Growth of Ω Plates and Its Effect on Mechanical Properties in Al-Cu-Mg-Ag Alloy with High Content of Silver

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Abstract

In this study, the effects of thermal exposure at 200 °C on the mechanical properties and the growth of Ω plates in an Al-Cu-Mg-Ag alloy with high content of silver were investigated. It was shown that the tensile strength of the exposed alloy decreased with the increase of the mean lengths of Ω precipitates and the decrease in the volume fraction of the Ω phase. The decrease in tensile strength of the 165 °C/14-h-aged samples was less significant than that of 165 °C/2-h-aged samples because the lengthening rate of Ω plates was lower and the number density of Ω precipitates was higher in the 165 °C/14 h-aged samples. The thickening rate of Ω plates was very low during exposure at 200 °C because of high content of silver, and the growth behavior was caused mainly by the lengthening of Ω plates within the habit plane. High content of silver inhibited the thickening of Ω plates and promoted the lengthening of Ω precipitates during exposure.

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Acknowledgments

The authors would like to gratefully acknowledge the financial support from the NSFC (51171209), and the National Key Fundamental Research Project of China.

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Authors and Affiliations

  1. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, 410083, People’s Republic of China

    Yanxia Gu, Zhiyi Liu, Dier Yu, Mao Lin & Sumin Zeng

  2. School of Materials Science and Engineering, Central South University, Changsha, 410083, People’s Republic of China

    Yanxia Gu, Zhiyi Liu, Dier Yu, Mao Lin & Sumin Zeng

  3. Faculty of Information Technology, Macao University of Science and Technology, Macau, People’s Republic of China

    Bingbin Liu

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  1. Yanxia Gu
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  2. Zhiyi Liu
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Correspondence to Zhiyi Liu.

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Gu, Y., Liu, Z., Yu, D. et al. Growth of Ω Plates and Its Effect on Mechanical Properties in Al-Cu-Mg-Ag Alloy with High Content of Silver. J. of Materi Eng and Perform 22, 1708–1715 (2013). https://doi.org/10.1007/s11665-013-0472-8

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  • DOI: https://doi.org/10.1007/s11665-013-0472-8

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