Journal
MATERIALS & DESIGN
Volume 146, Issue -, Pages 163-171Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.03.008
Keywords
Al-Bi immiscible alloy; Phase control; Self-assembled nanoparticles; Scalable manufacturing
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Funding
- U.S. Army Research Office [W911NF-14-1-0644]
- National Science Foundation
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Immiscible Al-Bi alloy, with a miscibility gap in the liquid state is not only scientifically important, but also it can offer outstanding self-lubricating properties. However, it is still difficult to control the distribution and size of minority Bi phase during cooling and solidification. Here we show that by applying a scalable molten salt assisted incorporation process, TiC nanoparticles can be incorporated in Al matrix to produce Al-TiC master nanocomposites, which can be readily used to process Al-Bi immiscible alloy and restrict the size of minority Bi phase. TiC nanoparticles can be self-assembled on the Al-Bi interface and restrict Bi phase size substantially. In addition, submicron minority Bi phase can be achieved by combining the addition of nanoparticles with high cooling rates. Mechanical properties of Al-Bi immiscible alloys can be further enhanced by the addition of Cu element and cold rolling. (c) 2018 Elsevier Ltd. All rights reserved.
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