期刊
ACTA MATERIALIA
卷 119, 期 -, 页码 68-79出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.08.013
关键词
Aluminum alloys; Microalloying effect; Solute segregation; Solute partitioning; Mechanical properties
资金
- National Natural Science Foundation of China [51321003, 51322104, 51171142, 51201133]
- China National Foundation for Distinguished Young Scientists
- National Basic Research Program of China (973 program) [2010CB631003, 2012CB619600]
- 111 Project of China [B06025]
- National Science Fund for Distinguished Young Scholars
- China Postdoctoral Science Foundation [2012M521765]
- Shaanxi Province Postdoctoral Scientific Research Projects
- International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies
A transmission electron microscope and an atom probe tomography were used to quantitatively characterize the microstructural evolution of Al-XCu alloys (X = 1.0, 1.5, and 2.5 wt%) with 0.3 wt Sc addition. A dual solute alloying/microalloying effect on the microstructural evolution was demonstrated. On the one hand, the nucleation and coarsening of Al3Sc dispersoids displayed a Cu alloying effect. By increasing the Cu content, both the Al3Sc disperoid size and the volume fraction decreased after solution treatment. On the other hand, the precipitation of theta'-Al2Cu strengthening particles during aging treatment was promoted by Sc segregation at the theta'/matrix interfaces, showing a notable Sc microalloying effect. The strongest interfacial Sc segregation was generated in the Al-2.5 wt%Cu-Sc alloy, resulting in the most promoted theta' precipitation. The Sc partitioning between Al3Sc dispersoids and Sc segregation at the theta'/matrix interfaces, tailored by the Cu content, impacted the mechanical properties and deformation behavior at both room temperature and high temperature. The Al-2.5 wt%Cu-Sc alloy had a room temperature yield strength of approximately 2.2 times that in its Sc-free counterpart and approximately 1.8 times that in the Al-1.5 wt%Cu-Sc alloy, which is rationalized by strengthening models. In addition, the improvement in the high-temperature mechanical properties after Sc addition was discussed in terms of the Sc segregation-induced high coarsening resistance of theta' precipitates. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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