期刊
INTERMETALLICS
卷 95, 期 -, 页码 110-118出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2018.01.021
关键词
High-entropy alloys; Phase stability; Laser processing and cladding; Microstructure; Nanoindentation
资金
- Washington University in St. Louis
- Institute of Materials Science and Engineering
- U.S. Department of Energy, Office of Science, Basic Energy Sciences Materials Science and Engineering Division (BES-MSED)
- Ramon y Cajal program [RyC-2012-11709]
Twenty-one distinct AlxCoCrFeNi alloys were rapidly prepared by laser alloying an equiatomic CoCrFeNi substrate with Al powder to create an alloy library ranging x = 0.15-1.32. Variations in crystal structure, microstructure and mechanical properties were investigated using X-ray diffraction, scanning electron microscopy, scanning transmission electron microscopy and nanoindentation. With increasing Al content, the crystal structure transitioned from a disordered FCC to a mixture of disordered BCC and ordered B2 structures. While the onset of BCC/B2 formation was consistent with previously reported cast alloys, the FCC structure was observed at larger Al contents in the laser processed materials, resulting in a wider two phase regime. The FCC phase was primarily confined to the BCC/B2 grain boundaries at these high Al contents. The nanoindentation modulus and hardness of the FCC phase increased with Al content, while the properties of the BCC/B2 structure were insensitive to composition. The structure and mechanical properties of the laser-processed alloys were surprisingly consistent with reported results for cast alloys, demonstrating the feasibility of applying this high-throughput methodology to multicomponent alloy design.
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