Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10142061 | Materials Science and Engineering: A | 2018 | 23 Pages |
Abstract
Microstructure and plastic flow behavior of 2060-T8 Al-Li alloy were investigated by subjecting the alloy to tensile tests at the temperatures varied from 25 to 500â¯Â°C, and a strain rate 0.001-0.1â¯sâ1. The constitutive equation of the alloy is based on a hyperbolic sine model, and consistent with the experimental data with 5.5% in deviation. The microstructure of the alloy is primarily composed of the phases denoted by T1 (Al2CuLi) and δⲠ(Al3Li), respectively. Both are distributed in grain interior. Moreover, a discontinuous distribution of the phases enriched with Cu is presented at grain boundaries due to the depletion of Cu atoms at grain boundaries, induced by an extensive existence of the phase T1 within grain interior. The transition in the fracture mode of the tensile samples from the brittle to ductile was also confirmed with the decrease of strain rate and the increase of temperature at which the tension was conducted.
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Authors
Xingwei Zheng, Peng Luo, Zhenhua Chu, Jingxiang Xu, Fenghua Wang,