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Light Weight High Entropy Alloys: Processing Challenges and Properties

[ Vol. 10 , Issue. 2 ]

Author(s):

Manoj Gupta* and Khin Sandar Tun   Pages 116 - 121 ( 6 )

Abstract:


Background: Light Weight High Entropy Alloys (LWHEAs).

Objective: The purpose of this article is to report the processing challenges we have faced during the development of LWHEAs and to highlight the alloys compositions which can be successfully processed.

Method: Both liquid and solid phase processing techniques were attempted to synthesize LWHEAs.

Results: A total of 12 HEA compositions were processed in the current study. Theoretically feasible but difficult to process compositions also been highlighted (unsuccessful in terms of processing) for the benefit of researchers who wishe to explore them using different innovative processing methods. Microstructure and hardness results have been reported for all successfully processed systems. The secondary phases formed in the developed LWHEAs were analysed. In addition, changes in microstructure arising as a result of variation of alloying element combination as well as the alloy composition have also been discussed.

Conclusion: LWHEAs with density less than aluminium alloys (~ 2.7 g/cc) and hardness much superior to both conventional aluminium and magnesium based alloys have been developed. Liquid phase disintegrated melt deposition route is more successful while solid phase routes need to be optimized.

Keywords:

Magnesium, aluminum, powder metallurgy, liquid metallurgy, HEAs, mechanical properties, microstructure.

Affiliation:

Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576



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