AlCoCrFeNiTi-C alloy with TiC nano precipitates processed through mechanical alloying and spark plasma sintering

•Supersaturated solution of NiAl B2 phase and CrFe phase with nano TiC precipitates.•Enhanced compressive strength due to Orowan strengthening.•In-situ reactions favouring TiC formation rather than other carbide formations.•Phase stability at 800 °C and 1000 °C. AlCoCrFeNiTi-C High Entropy Alloy (HE...

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Bibliographic Details
Published in:	Materials letters Vol. 285; p. 129185
Main Authors:	Sekhar, R. Anand, Shifin, S., Kumar, Anand Anil, Nair, Akash Hemanth, Sudhees, Akshai, Krishnan, Jagath
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 15-02-2021 Elsevier BV
Subjects:	Chemical precipitation Compressive strength HEA High entropy alloys Materials science Mechanical alloying Microstructure Nanosize Nickel aluminides Nickel base alloys Nickel compounds Orowan strengthening Particles Plasma sintering Powder technology Precipitates Room temperature Solid phases Spark plasma sintering TiC Powder technology HEA Orowan strengthening Nanosize Microstructure Mechanical alloying Particles TiC
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Summary:	•Supersaturated solution of NiAl B2 phase and CrFe phase with nano TiC precipitates.•Enhanced compressive strength due to Orowan strengthening.•In-situ reactions favouring TiC formation rather than other carbide formations.•Phase stability at 800 °C and 1000 °C. AlCoCrFeNiTi-C High Entropy Alloy (HEA) develops a single BCC phase after 10 h of milling. Sintering at 1000 °C promotes the formation of NiAl rich B2, CrFe disordered BCC and TiC phases making the alloy a dual phase structure with TiC precipitates. Alloy also exhibits a good room temperature compressive strength of 2503 ± 8 MPa and hardness of 910 ± HV0.5 which can be attributed to the presence of nano sized TiC.
ISSN:	0167-577X 1873-4979
DOI:	10.1016/j.matlet.2020.129185