Anisotropy Behaviors and Microstructure Evolution of 2195 Al-Li Alloy during Ultra-cryogenic Deformation

doi:10.3901/JME.2025.14.073

Abstract

Abstract: The anisotropic behavior of Al-Li alloy significantly influences its formability. The anisotropic mechanical behavior and microstructure evolution of 2195 Al-Li alloy at room temperature (RT) and -196 ℃ ultra-cryogenic temperature (CT) were studied. The tensile properties, strain hardening exponent n value, and anisotropy index r-value of 2195 Al-Li alloy along different directions were obtained by using the technology of CT tensile combined with digital image correlation (DIC), through the uniaxial tensile test at RT and CT. The grain deformation and the texture evolution with tensile deformation were analyzed, through ultra-cryogenic in-situ tensile scanning electron microscope observation. The results show that the n value of 2195 Al-Li alloy increases, the r-value increases, and the Δr value decreases at -196 ℃. When deformed at CT, more grains participate in deformation in different directions of Al-Li alloy, and the deformation uniformity is improved. Ultra-cryogenic temperature can accelerate the texture evolution process of Copper {112} <111>→S {123} <634>→Brass {011} <211>, thereby reducing the Copper texture components and increasing the r-value. In addition, the CT deformation will reduce the volume fraction of the β fiber texture, thereby weakening the influence of texture on in-plane anisotropy and decreasing the Δr value. The results show that the deformation uniformity of Al-Li alloy can be improved at CT, and reveals the micro-mechanism of the anisotropy reduction in the aluminum alloy under CT, laying a theoretical foundation for the application of aluminum alloy CT forming technology.

Key words: 2195 Al-Li alloy, cryogenic deformation, anisotropy, texture, grain deformation

CLC Number:

TG156

YAO Mengjia, WANG Ruiqian, LIU Wei. Anisotropy Behaviors and Microstructure Evolution of 2195 Al-Li Alloy during Ultra-cryogenic Deformation[J]. Journal of Mechanical Engineering, 2025, 61(14): 73-80.

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