Hot deformation behavior of 2195 aluminum-lithium alloy

doi:10.13251/j.issn.0254-6051.2021.08.027

Abstract

Abstract: Hot deformation behavior of the 2195 aluminum-lithium alloy at temperature range of 360-500 ℃ and strain rate of 0.1-10 s^-1 was studied by means of isothermal compression test on the Gleeble-1500 thermal mechanical simulator. The microstructure evolution of specimens upon hot deformation was characterized by using the optical microscopy (OM) and electron backscattered diffraction (EBSD). Processing map and constitutive equation of the 2195 alloy at strain of 50% were developed based on dynamic material model (DMM) theory and Zener-Holloman parameter. The results show that the flow stress increases with the decrease of deformation temperature or the increase of strain rate. The high temperature softening mechanism includes dynamic recovery and dynamic recrystallization. The best process parameters of hot deformation within the range of test parameters are 480 ℃/10 s^-1 by processing map and microstructure analysis; the deformed structure and recrystallized structure are alternately distributed in layers in the instability zone, and as the temperature decreases, the thickness of the deformed structure layers increases; the microstructure of the stable zone has obvious characteristic of dynamic recrystallization, and the deformed structure practically disappears.

Key words: 2195 aluminum-lithium alloy, microstructure, constitutive equation, processing map, process parameter

CLC Number:

TG164.21

Bao Zhangfei, Tang Lina, Wu Xingping, Luan Baifeng. Hot deformation behavior of 2195 aluminum-lithium alloy[J]. Heat Treatment of Metals, 2021, 46(8): 144-149.

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