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Comparative study of the microstructures and mechanical properties of direct laser fabricated and arc-melted AlxCoCrFeNi high entropy alloys

Joseph, Jithin, Jarvis, Tom, Wu, Xinhua, Stanford, Nicole, Hodgson, Peter and Fabijanic, Daniel Mark 2015, Comparative study of the microstructures and mechanical properties of direct laser fabricated and arc-melted AlxCoCrFeNi high entropy alloys, Materials science and engineering: A, vol. 633, pp. 184-193, doi: 10.1016/j.msea.2015.02.072.

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Title Comparative study of the microstructures and mechanical properties of direct laser fabricated and arc-melted AlxCoCrFeNi high entropy alloys
Formatted title Comparative study of the microstructures and mechanical properties of direct laser fabricated and arc-melted AlxCoCrFeNi high entropy alloys
Author(s) Joseph, Jithin
Jarvis, Tom
Wu, Xinhua
Stanford, Nicole
Hodgson, Peter
Fabijanic, Daniel Mark
Journal name Materials science and engineering: A
Volume number 633
Start page 184
End page 193
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-05-01
ISSN 0921-5093
Keyword(s) Arc-melting
Direct laser fabrication
High entropy alloy
Mechanical properties
Microstructure
Science & Technology
Technology
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Science & Technology - Other Topics
Materials Science
HYDROGEN STORAGE PROPERTIES
NET SHAPING LENS
SOLID-SOLUTION
MULTICOMPONENT ALLOYS
ALUMINUM CONTENT
PHASE-STABILITY
WEAR BEHAVIOR
DEPOSITION
POWDER
ELEMENTS
Summary High entropy alloys (HEA) are a relatively new metal alloy system that have promising potential in high temperature applications. These multi-component alloys are typically produced by arc-melting, requiring several remelts to achieve chemical homogeneity. Direct laser fabrication (DLF) is a rapid prototyping technique, which produces complex components from alloy powder by selectively melting micron-sized powder in successive layers. However, studies of the fabrication of complex alloys from simple elemental powder blends are sparse. In this study, DLF was employed to fabricate bulk samples of three alloys based on the AlxCoCrFeNi HEA system, where x was 0.3, 0.6 and 0.85M fraction of Al. This produced FCC, FCC/BCC and BCC crystal structures, respectively. Corresponding alloys were also produced by arc-melting, and all microstructures were characterised and compared longitudinal and transverse to the build/solidification direction by x-ray diffraction, glow discharge optical emission spectroscopy and scanning electron microscopy (EDX and EBSD). Strong similarities were observed between the single phase FCC and BCC alloys produced by both techniques, however the FCC/BCC structures differed significantly. This has been attributed to a difference in the solidification rate and thermal gradient in the melt pool between the two different techniques. Room temperature compression testing showed very similar mechanical behaviour and properties for the two different processing routes. DLF was concluded to be a successful technique to manufacture bulk HEA[U+05F3]s.
Language eng
DOI 10.1016/j.msea.2015.02.072
Field of Research 091006 Manufacturing Processes and Technologies (excl Textiles)
091399 Mechanical Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30075607

Document type: Journal Article
Collection: Institute for Frontier Materials
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