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Metals 2016, 6(7), 146;

Creep Aging Behavior Characterization of 2219 Aluminum Alloy

Light Metal Research Institute, Central South University, Changsha 410083, China
National Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China
Author to whom correspondence should be addressed.
Academic Editor: Nong Gao
Received: 11 May 2016 / Revised: 9 June 2016 / Accepted: 11 June 2016 / Published: 29 June 2016
(This article belongs to the Special Issue Aluminum Alloys)
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In order to characterize the creep behaviors of 2219 aluminum alloy at different temperatures and stress levels, a RWS-50 Electronic Creep Testing Machine (Zhuhai SUST Electrical Equipment Company, Zhuhai, China) was used for creep experiment at temperatures of 353~458 k and experimental stresses of 130~170 MPa. It was discovered that this alloy displayed classical creep curve characteristics in its creep behaviors within the experimental parameters, and its creep value increased with temperature and stress. Based on the creep equation of hyperbolic sine function, regression analysis was conducted of experimental data to calculate stress exponent, creep activation energy, and other related variables, and a 2219 aluminum alloy creep constitutive equation was established. Results of further analysis of the creep mechanism of the alloy at different temperatures indicated that the creep mechanism of 2219 aluminum alloy differed at different temperatures; and creek characteristics were presented in three stages at different temperatures, i.e., the grain boundary sliding creep mechanism at a low temperature stage (T < 373 K), the dislocation glide creep mechanism at a medium temperature stage (373 K ≤ T < 418 K), and the dislocation climb creep mechanism at a high temperature stage (T ≥ 418 K). By comparative analysis of the fitting results and experiment data, they were found to be in agreement with the experimental data, revealing that the established creep constitutive equation is suitable for different temperatures and stresses. View Full-Text
Keywords: 2219 aluminum alloy; creep; creep mechanism; constitutive modeling 2219 aluminum alloy; creep; creep mechanism; constitutive modeling

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Liu, L.; Zhan, L.; Li, W. Creep Aging Behavior Characterization of 2219 Aluminum Alloy. Metals 2016, 6, 146.

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