Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 9, Issue 4, Pages 7136-7148Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2020.04.061
Keywords
Al-7Si; Al3Ti; Sr modification; Wear
Funding
- National Natural Science Foundation of China [51601122]
- Science and Technology Major Project of Shanxi [20181102013]
- 1331 Project Engineering Research Center of Shanxi [PT201801]
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The microstructure and wear behavior of an Al-75i alloy reinforced with in situ Al3Ti particulates were studied. The effects of Sr modification and heat treatment were also investigated. Sr and Al3Ti particulates had clear effects on modifying the morphology of eutectic Si and the microstructure of the Al-Si alloy, playing a key role in improving the hardness and wear properties of the Al3Ti/Al-75i-Sr composite. T6 heat treatment was performed to spheroidized coarse eutectic Si, reducing stress concentration and further improving the hardness and wear properties of the composites. Among them, the Al3Ti/Al-75i-Sr composite displayed the highest hardness and the lowest friction coefficient in both as-cast and T6 heat treated states attributed to the combined effects of Sr modification and Al3Ti reinforcement. (C) 2020 The Author(s). 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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