Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 777, Issue -, Pages 828-834Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.11.057
Keywords
High-entropy alloy; Chemical evolution; Mechanical properties; Specific strength
Categories
Funding
- National Research Foundation(NRF) of Korea - Korea government(Ministry of Science and ICT) [2018R1A2B3007167, 2017R1C1B5017092]
- Technology Innovation Program - Ministry of Trade, Industry and Energy (MOTIE, Korea) [10070159, 10063052]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10070159] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2017R1C1B5017092, 2018R1A2B3007167] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2018 Elsevier B.V. All rights reserved.
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