Precipitation, Recrystallization, and Evolution of Annealing Twins in a Cu-Cr-Zr Alloy
Abstract
:1. Introduction
2. Experiments
3. Results
3.1. Properties
3.2. Microstructure
4. Discussion
4.1. The Influence of the Precipitation on Strength and Conductivity
4.2. The Effect of the Precipitation and Recrystallization Mechanisms on Recrystallization Resistance
5. Conclusions
- A Cu-Cr-Zr alloy with a good combination of strength and conductivity can be obtained. The peak aged condition, with a tensile strength of 536 MPa and electron conductivity of 85.3% IACS, can be achieved after the alloy undergoes a solid solution treatment at 1253 K, before being cold-rolled with a reduction ratio of 70% and aged at 723 K for 240 min. The increasing strength and the conductivity are mainly related to the formation of the transition phase β′. A new type of fcc Cr-rich precipitate β′(II) is observed in the peak aged condition, which has an ordered structure and is coherent with the matrix, with the following OR: [011]β′(II)//[211]Cu, {200}β′(II)//{-111}Cu and [111]β′(II)//[100]Cu, {02-2}β′(II)//{02-2}Cu.
- The Cu-Cr-Zr alloy has a good recrystallization resistance. The dispersed distribution of the β′ phase shows a good thermal stability during annealing, and can pin the dislocations and grain boundaries to hinder their migration, inhibiting recrystallization and thus enhancing the recrystallization resistance. When the β′ particles are replaced by the coarsened β particles, and when there is a reduction in the density of precipitates, the pinning effect on the dislocations and grain boundaries becomes weak, and recrystallization starts to occur in the Cu-Cr-Zr alloy.
- Recrystallization nucleation and growth first occurs in the shear deformation zone due to its high deformation energy during the recrystallization process. The growth of the recrystallized grains, as well as the decrease in hardness during annealing, is hindered by the formation of annealing twins due to the release of deformation energy and the reduction of the driving force for interface migration.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Chen, X.; Jiang, F.; Jiang, J.; Xu, P.; Tong, M.; Tang, Z. Precipitation, Recrystallization, and Evolution of Annealing Twins in a Cu-Cr-Zr Alloy. Metals 2018, 8, 227. https://doi.org/10.3390/met8040227
Chen X, Jiang F, Jiang J, Xu P, Tong M, Tang Z. Precipitation, Recrystallization, and Evolution of Annealing Twins in a Cu-Cr-Zr Alloy. Metals. 2018; 8(4):227. https://doi.org/10.3390/met8040227
Chicago/Turabian StyleChen, Xiaobo, Feng Jiang, Jingyu Jiang, Pian Xu, Mengmeng Tong, and Zhongqin Tang. 2018. "Precipitation, Recrystallization, and Evolution of Annealing Twins in a Cu-Cr-Zr Alloy" Metals 8, no. 4: 227. https://doi.org/10.3390/met8040227