DYNAMIC SOFTENING MECHANISM OF 2099 ALLOY DURING HOT DEFORMATION PROCESS

doi:10.3724/SP.J.1037.2013.00718

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 Jian¹, YAN Xiaodong¹, SUN Jianlin², JIANG Na³, ZHOU Hua³

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

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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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

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	Fei ZHANG
	Jian SHEN
	Xiaodong YAN
	Jianlin SUN
	Na JIANG
	Hua ZHOU

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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

Fig.1 OM images of 2099 alloy as-cast (a) and after homogenization treatment at 515 ℃ for 18 h and 525 ℃ for 16 h (b)

Fig.2 Curves of flow stress-strain rates of 2099 alloy under different temperatures (T—temperature, σ—stress,

ε ˙

—stain rate)

Table 1 Thermal activation parameters of 2099 alloy

Fig.3 Fit curves of apparent activation volume with lnZ of 2099 alloy

Fig.4 TEM images of 2099 alloy under lnZ=37.8 (300 ℃, 0.01 s^-1) (a) and lnZ=35.5 (300 ℃, 0.001 s^-1) (b)

Fig.5 TEM images of 2099 alloy under lnZ=37.4 (420 ℃, 10 s^-1) (a), lnZ=32.8 (420 ℃, 0.1 s^-1) (b), lnZ=30.9 (460 ℃, 0.1 s^-1) (c) and lnZ=24.5 (500 ℃, 0.001 s^-1) (d)

Fig.6 Fig.6 EBSD maps of 2099 alloy when lnZ=35.5 (300 ℃, 0.001 s^-1)

(a) orientation image map

(b) grain boundary reconstruction map

Fig.7 Fig.7 EBSD maps of 2099 alloy when lnZ=35.1 (420 ℃, 1 s^-1)

(a) orientation image map

(b) grain boundary reconstruction map

Fig.8 Orientation image (a, c) and grain boundary reconstruction (b, d) maps of 2099 alloy at 420 ℃ (a, b) and 500 ℃ (c, d) with strain rate of 0.1 s^-1

Fig.9 TEM images of 2099 alloy at 420 ℃ (a) and 500 ℃ (b) with strain rate of 0.1 s^-1

Fig.10 Orientation image (a, c) and grain boundary reconstruction (b, d) maps of 2099 alloy at 420 ℃ (a, b) and 500 ℃ (c, d) with strain rate of 0.001 s^-1

Fig.11 TEM images of 2099 alloy at 420 ℃ (a), 460 ℃ (b) and 500 ℃ (c) with strain rate of 0.001 s^-1

Fig.12 Statistical graph of misorientation distribution under different deformation conditions for 2099 alloy

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