Effect of strain on phase selection in High Entropy Alloys

Thoeny, Bryce

Effect of strain on phase selection in High Entropy Alloys

File

2017_Thoeny_EffectStrain.pdf (2.84 MB)

Date

2017-12-06

Authors

Thoeny, Bryce

Organizational Units

Organizational Unit

Materials Science and Engineering

Materials engineers create new materials and improve existing materials. Everything is limited by the materials that are used to produce it. Materials engineers understand the relationship between the properties of a material and its internal structure — from the macro level down to the atomic level. The better the materials, the better the end result — it’s as simple as that.

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Honors Projects and Posters

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Department

Materials Science and Engineering

Abstract

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.