Journal
MATERIALS & DESIGN
Volume 180, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2019.107893
Keywords
Complex concentrated alloy coating; Spark plasma sinteting; Hierarchical nanoprecipitates; Precipitation strengthening; Mechanical properties
Categories
Funding
- Taishan Scholarship of Climbing Plan [tspd20161006]
- National Natural Science Foundation of China [51772176]
- Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents [2017RCJJ018]
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An increasing number of recent studies have indicated that the best balance of mechanical properties of a high-entropy alloy (HEA) needed to meet the requirements of practical structural applications require to produce second precipitates in an HEA matrix. This type of alloy is more appropriately classified as a complex concentrated alloy (CCA) rather than an HEA. Here, we report a simple strategy for the fabrication of CCA coatings with high mechanical properties. In this strategy, the face-centred cubic (FCC)-based Co25Cr25Cu12.5Ni25Al12.5 (at.%) system was chosen, and spark plasma sintering was first used to prepare the Co25Cr25Cu12.5Ni25Al12.5 CCA clad layer directly on a Q235 substrate from simple mixed powders. Our results show that the CCA coating was fabricated successfully on the substrate and that the clad layer exhibited a dense microstructure, a low dilution ratio and good metallurgical bonding with the substrate. A high density of hierarchical intragranular nanoprecipitates was contained in the dad layer. Precipitation strengthening, as one of the main strengthening mechanisms, contributes to a microhardness value of 455 HV for the clad layer, which is much higher than those of most reported FCC-structured HEAs, even some BCC-structured refractory HEM and several BCC-based HEM with high Al contents. (C) 2019 Published by Elsevier Ltd.
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