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Static softening behaviors of 7055 alloy during the interval time of multi-pass hot compression

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Abstract

Multipass plain strain compression test of 7055 alloy was carried out on Gleeble 1500D thermomechanical simulator to study the effect of interval time on static softening behavior between two passes. Microstructural features of the alloy deformed with delay times varying from 0 to 180 s after achieving a reduction of ~52 % in the 13 stages was investigated through TEM and EBSD observations. The 14th pass of peak stresses after different delay times were gained. The peak stress decreases with the interstage delay time increasing, but the decreasing trend is gradually slower. Static recovery, metadynamic recrystallization, and/or static recrystallization can be found in the alloy during two passes. The recovery and recrystallization degree increases with longer interstage delay time. The static recovery is the main softening mechanism. Subgrain coalescence and subgrain growth together with particle-stimulated nucleation are the main nucleation mechanisms for static recrystallization.

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Acknowledgments

This study was financially supported by the Natural Science Foundation of Inner Mongolia (No. 2011bs0802) and Research Fund for the Higher Education of Inner Mongolia (No. NJZY11075).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Innermongolia University of Technology, Huhhot, 010051, China

    Liang-Ming Yan

  2. Department of Processing Business, General Research Institute for Nonferrous Metals, Beijing, 100088, China

    Jian Shen & Bai-Ping Mao

  3. Science and Technology Department, Aluminum Corporation of China Limited, Beijing, 100082, China

    Jun-Peng Li

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  1. Liang-Ming Yan
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  2. Jian Shen
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  3. Jun-Peng Li
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  4. Bai-Ping Mao
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Correspondence to Liang-Ming Yan.

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Yan, LM., Shen, J., Li, JP. et al. Static softening behaviors of 7055 alloy during the interval time of multi-pass hot compression. Rare Met. 32, 241–246 (2013). https://doi.org/10.1007/s12598-013-0065-6

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  • DOI: https://doi.org/10.1007/s12598-013-0065-6

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