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Cooling Rate and Size Effect on the Microstructure and Mechanical Properties of AlCoCrFeNi High Entropy Alloy

[+] Author and Article Information
F. J. Wang, Y. Zhang, G. L. Chen

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

H. A. Davies

Department of Engineering Materials, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK

J. Eng. Mater. Technol 131(3), 034501 (May 21, 2009) (3 pages) doi:10.1115/1.3120387 History: Received August 14, 2008; Revised January 26, 2009; Published May 21, 2009

High entropy alloys are usually defined as the kind of alloys with at least five principle components, each component has the equi-atomic ratio or near equi-atomic ratio, and the high entropy alloys can have very high entropy of mixing, forming simple solid solution rather than many complex intermediate phases. In this paper, the size effects on the microstructure and mechanical behaviors of a high entropy alloy of AlCoCrFeNi was studied by preparing as-cast rod samples with different diameters. The alloy independent of cast diameter samples has the same phase of body centered cubic solid solution. With decreasing casting diameter, both the strength and the plasticity are increased slightly.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

The XRD patterns for AlCoCrFeNi alloy samples with different diameters

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Figure 2

SEM backscattered electron images for the as-cast AlCoCrFeNi alloy samples with different diameters ((a) 2 mm, (b) 5 mm, (c) 8 mm, and (d) 10 mm)

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Figure 3

Compressive true stress-true strain curves for the AlCoCrFeNi alloy samples with different diameters

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Figure 4

Scanning electron micrographs of compressive fracture surfaces for the AlCoCrFeNi alloy samples with diameters of 2 mm ((a) and (b)), 5 mm ((c) and (d)), 8 mm, and 10 mm

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