Comparison of Plasma Sprayed High Entropy Alloys with Conventional Bond Coat Materials

Wednesday, May 13, 2015: 8:00 AM
Room 102B (Long Beach Convention and Entertainment Center)
Dr. Andrew S.M. Ang , Swinburne University of Technology, Hawthorn, VIC, Australia
Prof. Christopher C. Berndt , Swinburne University of Technology, Melbourne, Australia
Mr. Mitchell L. Sesso , Swinburne University of Technology, Melbourne, Australia
Ms. Ameey Anupam , Indian Institute of Technology Madras, Chennai, India
Mr. Praveen Sathiyamoorthi , Indian Institute of Technology Madras, Chennai, India
Dr. Ravi Sankar Kottada , Indian Institute of Technology Madras, Chennai, India
Prof. B.S. Murty , Indian Institute of Technology Madras, Chennai, India
High Entropy Alloys (HEAs) are a new class of alloys with multi-principle elements in equi-atomic ratio that present novel phase structures. HEAs are known to for their high temperature microstructural stability, enhanced oxidation and wear resistance properties. Apart from bulk material consolidation methods such as casting and sintering, HEAs can also be deposited as a surface coating. In this work, thermal sprayed HEA coatings are investigated as an alternative bond coat material for a thermal barrier coating system. Nanostructured HEAs that were based on AlCoCrFeNi and MnCoCrFeNi were prepared by ball milling and then plasma sprayed. Splat studies were assessed to optimise the appropriate thermal spray parameters and spray deposits were prepared. Subsequently, the microstructure and mechanical properties of both type of HEAs coatings were characterized and compared to conventional plasma spray NiCrAlY bond coats.