Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 9, Issue 3, Pages 2983-2991Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2020.01.049
Keywords
High-pressure solidification; Al-Cu alloy; Aging treatment; Microstructure
Funding
- National Key Research and Development Program of China [2016YFB0700203]
- National Natural Science Foundation of China [51601110, 51971123]
- European Regional Development Fund through the project MOBERC15
- Shanghai Science and Technology Committee Innovation [17JC1400600, 17JC1400601]
- Talent Project ofShanghai University of Engineering Science
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In this study, Al-xCu alloy containing x = 15, 33, and 40 wt.% Cu was solidified under different pressures (atmospheric pressure, 1 GPa, 2 GPa, and 3 GPa). The effects of the solidification pressure and aging treatment on the microstructural evolution and mechanical property of these alloys were investigated. The eutectic Al2Cu phase varied between dendritic to spher- ical morphology in Al-15Cu alloy with the application of pressure. Both the secondary arm spacing in Al-33Cu alloy and the size of primary Al2Cu in Al-40Cu alloy had decreased under the influence of high pressure during solidification. As a result of solid solution strength- ening, the Vickers hardness increases significantly for the Al-xCu alloys with high-pressure solidification. The microstructure variation was further explained based on undercooling theory. (C) 2020 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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