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First report on cold-sprayed AlCoCrFeNi high-entropy alloy and its isothermal oxidation

Published online by Cambridge University Press:  13 March 2019

Ameey Anupam Open the ORCID record for Ameey Anupam [Opens in a new window] ,
S. Kumar ,
Naveen M. Chavan ,
Budaraju Srinivasa Murty Open the ORCID record for Budaraju Srinivasa Murty [Opens in a new window]  and
Ravi Sankar Kottada
Ameey Anupam*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036, India
S. Kumar
Affiliation:
Centre for Engineered Coatings, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, India
Naveen M. Chavan
Affiliation:
Centre for Engineered Coatings, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500 005, India
Budaraju Srinivasa Murty
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036, India
Ravi Sankar Kottada*
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036, India
*
a)Address all correspondence to these authors. e-mail: ameeyanupam@gmail.com
b)e-mail: ravi.sankar@iitm.ac.in
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Abstract

Cold-sprayed high-entropy alloy (HEA) coatings have been generated for the first time. Mechanically alloyed (MA) AlCoCrFeNi powder was chosen as feedstock, owing to the extensive literature on this alloy. Coatings were synthesized under various gas temperature and pressure conditions. Isothermal oxidation was conducted at 1100 °C for 25 h on the coating cold-sprayed at 400 °C and 10 bar on a Ni-base superalloy substrate. The as-sprayed coating retained the MA phases and formed a protective alumina layer upon oxidation. An interdiffusion zone at the interface and unanticipated Mo diffusion from the superalloy substrate into the coating were observed after oxidation. A comprehensive characterization at the coating–substrate interface suggests that diffusion in HEAs is not sluggish. The factors governing the coating’s oxidation are elucidated, and a plausible oxidation mechanism is discussed. These studies are aimed at developing oxidation-resistant HEA coatings for potential applications at high operating temperatures.

Keywords

coatingoxidationmechanical alloying

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Type
Article
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Journal of Materials Research , Volume 34 , Issue 5: Focus Issue: Nanocrystalline High Entropy Materials: Processing Challenges and Properties , 14 March 2019 , pp. 796 - 806
Copyright
Copyright © Materials Research Society 2019 

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