Effect of thermomechanical treatment on the microstructure, phase composition, and mechanical properties of Al–Cu–Mn–Mg–Zr alloy
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- 作者：I. S. Zuiko ; M. R. Gazizov ; R. O. Kaibyshev
- 关键词：aluminum alloy ; thermomechanical treatment ; aging ; microstructure ; mechanical properties
- 刊名：The Physics of Metals and Metallography
- 出版年：2016
- 出版时间：September 2016
- 年：2016
- 卷：117
- 期：9
- 页码：906-919
- 全文大小：2,669 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
- 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：1555-6190
- 卷排序：117
文摘
The effect of the thermomechanical treatment on the microstructure, phase composition, and mechanical properties of heat-treatable AA2519 aluminum alloy (according to the classification of the Aluminum Association) has been considered. After solid-solution treatment, quenching, and artificial aging (T6 treatment) at 180°C for the peak strength, the yield stress, ultimate tensile strength, and elongation to failure are ~300 MPa, 435 MPa, and 21.7%, respectively. It has been shown that treatments that include intermediate plastic deformations with degrees of 7 and 15% (T87 and T815 treatments, respectively) have a significant effect on the phase composition and morphology of strengthening particles precipitated during peak aging T8X type, where X is pre-strain percent, treatments initiate the precipitation of significant amounts of particles of the θ′- and Ω-phases. After T6 treatment, predominantly homogeneously distributed particles of θ″-phase have been observed. Changes in the microstructure and phase composition of the AA2519 alloy, which are caused by intermediate deformation, lead to a significant increase in the yield stress and ultimate tensile strength (by ~40 and ~8%, respectively), whereas the plasticity decreases by 40–50%.