Date

6-12-2017 12:00 AM

Major

Materials Engineering

Department

Materials Science and Engineering

College

College of Engineering

Project Advisor

Pratik Ray

Project Advisor's Department

Materials Science and Engineering

Description

High-entropy alloys are potential candidates for high temperature application which form solid solutions with FCC, BCC, and HCP crystal structures. In order to investigate the applicability of Hume-Rothery rules and approaches to these alloys, we devise a set of experiments for understanding the role of strain and valence-electron concentrations. In this study, we explore the role of strain by varying the Ti:Zr ratio in pseudo-quaternary AlCuNi(TixZr1-x) alloys. The alloys were synthesized using different techniques in order to assess the role of kinetics in phase selection. The samples were analyzed via x-ray diffraction and scanning electron microscopy. All compositions tested were found to consist of a primary BCC phase and a secondary FCC phase. With the addition of Ti significant peak broadening was observed.

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Dec 6th, 12:00 AM

Effect of strain on phase selection in High Entropy Alloys

High-entropy alloys are potential candidates for high temperature application which form solid solutions with FCC, BCC, and HCP crystal structures. In order to investigate the applicability of Hume-Rothery rules and approaches to these alloys, we devise a set of experiments for understanding the role of strain and valence-electron concentrations. In this study, we explore the role of strain by varying the Ti:Zr ratio in pseudo-quaternary AlCuNi(TixZr1-x) alloys. The alloys were synthesized using different techniques in order to assess the role of kinetics in phase selection. The samples were analyzed via x-ray diffraction and scanning electron microscopy. All compositions tested were found to consist of a primary BCC phase and a secondary FCC phase. With the addition of Ti significant peak broadening was observed.