High Temperature Deformation Behavior of 8090 Al-Li Alloy | Zendy

Woo Young Jung | Zendy; Tae Kwon Ha | Zendy

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High Temperature Deformation Behavior of 8090 Al-Li Alloy

Author(s) -

Woo Young Jung,

Tae Kwon Ha

Publication year - 2013

Publication title -

advances in materials science and engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.356

H-Index - 42

eISSN - 1687-8442

pISSN - 1687-8434

DOI - 10.1155/2013/512606

Subject(s) - superplasticity , materials science , grain boundary sliding , deformation (meteorology) , grain size , atmospheric temperature range , activation energy , grain boundary , alloy , microstructure , thermodynamics , metallurgy , composite material , physics , chemistry

High temperature deformation behavior, especially the superplasticity of an 8090 Al-Li alloy, was studied within the recent framework of the internal variable theory of structural superplasticity. In this study, a series of load relaxation tests were conducted at various temperatures ranging from 200°C to 530°C to obtain the flow curves of log ε˙ versus log ε. The effect of grain size was also examined by varying the grain sizes through a proper thermomechanical treatment. The flow curves were found to be composite curves consisting of contributions from grain boundary sliding (GBS) and grain matrix deformation (GMD) at superplastic temperatures. The activation energy obtained for GMD was 124.9 kJ/mole in the temperature range from 470°C to 530°C, very similar to that for self-diffusion in pure Al

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