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Acta Metall Sin  2014, Vol. 50 Issue (6): 691-699    DOI: 10.3724/SP.J.1037.2013.00718
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DYNAMIC SOFTENING MECHANISM OF 2099 ALLOY DURING HOT DEFORMATION PROCESS
ZHANG Fei 1, 2), SHEN Jian 1), YAN Xiaodong 1), SUN Jianlin 2), JIANG Na 3), ZHOU Hua 3)
1) Beijing General Research Institute for Non-ferrous Metals, Beijing 100088
2) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
3) Southwest Aluminum (Group) Co., Ltd, Chongqing 401326
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Abstract  Dynamic softening mechanism of 2099 alloy was investigated by isothermal compression tests, thermal activation parameters calculation and comparison, EBSD and TEM techniques. On the basis of Zener-Hollomon parameter (Z) and deformation temperature (T), combining thermal activation parameters and microstructures analysis, the softening mechanism of 2099 alloy during hot deformation has been proposed. Dislocation cross slip plays a dominant role under the conditions of lnZ≥35.5 and T≤380 ℃. While, deformation mechanisms such as cross slip, climb of dislocation and unzipping of attractive junction play a joint role when lnZ≤37.4 and T≥340 ℃. Particularly, dynamic recrystallization occurred in the range of lnZ≤35.1 and T≥420 ℃, cross slip, climb and unzipping of dislocation and dynamic recrystallization are the main softening mechanisms in this condition. Dynamic recrystallization nucleation mechanisms are constituted of grain boundaries bulging nucleation and subgrain rotated induced nucleation, and the latter becomes more significant with increasing temperature and decreasing strain rate.
Key words:  dynamic recovery      dynamic recrystallization      cross slip      climb     
Received:  11 November 2013     
ZTFLH:  TS912.3  
  TG111.7  
Fund: Supported by National Basic Research Program of China (No.2012CB619504)
Corresponding Authors:  SHEN Jian, professor, Tel: (010)82241929, E-mail: jshen@grinm.com   

Cite this article: 

ZHANG Fei , SHEN Jian , YAN Xiaodong , SUN Jianlin , JIANG Na , ZHOU Hua . DYNAMIC SOFTENING MECHANISM OF 2099 ALLOY DURING HOT DEFORMATION PROCESS. Acta Metall Sin, 2014, 50(6): 691-699.

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2013.00718     OR     https://www.ams.org.cn/EN/Y2014/V50/I6/691

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