期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.09.090
关键词
As-quenched Al-Cu-Mn alloy; Precipitation; Dislocation forest; Arrhenius model; Activation energy
类别
资金
- National Natural Science Foundation of China [U1537202]
It is difficult to predict the deformation behavior of Al-Cu-Mn alloy during a quenching process due to the complex hardening mechanisms. In this paper, isothermal tensile tests were conducted under controlled experimental conditions (298-773 K and 0.001-0.1/s strain rate). Observations on the microstructure of the alloy and tensile test analyses on stress-strain curves both verified that the deformation mechanisms differed drastically at 298-473 K and 573-773 K. Therefore, a temperature-dependent constitutive model was established to characterize the divergent flow behaviors of as-quenched Al-Cu-Mn alloy. In addition, the activation energy, Q, in the model is determined by the combined effect of dislocation forests and precipitate phases, various with different experimental conditions.
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