Chemical evolution-induced strengthening on AlCoCrNi dual-phase high-entropy alloy with high specific strength

Quaternary AlCoCrNi alloy was designed by removing the heavy constituent of Fe from the dual-phase AlCoCrFeNi high-entropy alloy to achieve low density with good mechanical properties. The AlCoCrNi alloy exhibited a nano-scale dual-phase structure consisted of Cr-rich A2 and Ni(Co)-Al-rich B2 phases...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-03, Vol.777, p.828-834
Main Authors: Jumaev, Elyorjon, Hong, Sung Hwan, Kim, Jeong Tae, Park, Hae Jin, Kim, Young Seok, Mun, Sang Chul, Park, Jun-Young, Song, Gian, Lee, Jong Kook, Min, Byung Ho, Lee, Taegyu, Kim, Ki Buem
Format: Article
Language:English
Subjects:
Aluminum
Chemical evolution
Composition
Entropy
High entropy alloys
High-entropy alloy
Intermetallic phases
Mechanical properties
Metallurgical constituents
Nickel
Organic chemistry
Quaternary alloys
Solid phases
Specific strength
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Summary:Quaternary AlCoCrNi alloy was designed by removing the heavy constituent of Fe from the dual-phase AlCoCrFeNi high-entropy alloy to achieve low density with good mechanical properties. The AlCoCrNi alloy exhibited a nano-scale dual-phase structure consisted of Cr-rich A2 and Ni(Co)-Al-rich B2 phases with a high degree of coherence in both dendritic and interdendritic regions. In particular, the Ni(Co)-Al-rich B2 phase revealed the non-stoichiometric composition between the Ni and the Al, which deviated with the Ni-Al-rich B2 phase with a stoichiometric composition in the previous AlCoCrFeNi high-entropy alloy. The chemical evolution in the constituent phases strongly affected the mechanical properties of the dual-phase high-entropy alloy. Based on these microstructural features of the AlCoCrNi alloy, the mechanical properties were systematically investigated at wide temperature ranges. [Display omitted] •AlCoCrNi alloy is designed by modulating from the AlCoCrFeNi HEA.•Nano-scaled Cr-rich A2 and Ni(Co)Al-rich B2 phases are formed in ID and DR regions.•The Ni(Co)Al-rich B2 phase exhibits non-stoichiometric composition between Ni and Al.•The chemical evolution on B2 phase induces a strengthening of the AlCoCrNi alloy.•The alloy with a low density of 6.9 gcm−3 reveals superior specific strength at wide temperature ranges.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.11.057