Dynamic evolution of microstructure of Al-Cu-Li alloy during hot deformation

被引：0
作者：
Yang S.-L. [1 ]
Shen J. [2 ]
Chen L.-Y. [1 ]
Li X.-W. [2 ]
机构：
[1] Luoyang Ship Material Research Institute, Luoyang
[2] State Key Laboratory of Nonferrous Metals and Processes, GRINM Group Co., LTD., Beijing
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 04期
关键词：
Al-Cu-Li alloy; Dynamic precipitation; Dynamic recovery; Dynamic recrystallization; Hot deformation;
D O I：
10.19476/j.ysxb.1004.0609.2019.04.02
中图分类号：
学科分类号：
摘要：
The dynamic softening mechanism and the dynamic evolution of the precipitate phase in the thermal deformation process of Al-Cu-Li alloy were studied by isothermal thermal deformation experiment and TEM analysis. Based on the Zener-Hollomon parameter (Z), deformation temperature (t), thermal activation parameters and microstructure analysis, the dynamic softening mechanism of the alloy during the thermal deformation was clarified. The results show that, when lnZ>51.70 and T<420 ℃, the main softening mechanism is cross-slip of screw dislocation and climbing of edge dislocation; when 47.10<lnZ<51.70 and t≥380 ℃, the cross-slip of screw dislocation,detachment of three-dimensional dislocation network and particle dislocations depinning are the main softening mechanism, and some dynamic recrystallization occurs; when lnZ≤47.10 and t≥420 ℃, the dynamic recovery and dynamic recrystallization are the main softening mechanism. Dynamic precipitation and refinement of T1 phase (Al2CuLi) of the alloy during hot deformation (340-500 ℃) were studied systematically. The rule of dynamic precipitation and refinement of T1 phase is as follows: the coarse T1 phase precipitation occurs at the holding stage of 340-460 ℃, and the T1 phase is precipitated and refined dynamically at the deformation stage of 340-420 ℃. The refinement of T1 phase are derived from two aspects. One is that, the coarse T1 phase precipitated in holding stage is broken and dissolved during the hot deformation processing. The other is that, the original grain boundaries, a large number of dislocations and subgrain boundaries introduced during the hot deformation provide a large amount of heterogeneous nucleation site for the T1 phase, which leads to the fine precipitation of T1. When the deformation temperature is higher than 460 ℃, without precipitation of T1. The β' phase (Al3Zr) and Mn-containing phase always keep stable existence during the hot deformation. The δ' phase (Al3Li) can precipitate in the quenching process. © 2019, Science Press. All right reserved.
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页码：674 / 683
页数：9
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