Committee Chair

Ibrahim, Hamdy

Committee Member

Goulet, Ron; Mahtabi Oghani, Mohammad Javad, 1982-

Department

Dept. of Mechanical Engineering

College

College of Engineering and Computer Science

Publisher

University of Tennessee at Chattanooga

Place of Publication

Chattanooga (Tenn.)

Abstract

High entropy alloys (HEAs) are a relatively new class of metallic materials that have shown great potential for use in extreme environments, such as high temperatures and corrosive conditions. Among the different types of HEAs, CoCrNiFeAl HEAs are potential materials for a wide range of applications, including aerospace, biomedical, and energy storage. This work focused on the effects of heat treatment temperatures from 800 °C to 1100 °C on the microstructure and mechanical properties of these alloys, as well as their electrochemical corrosion behavior. A thermodynamic model was implemented to predict the performance of the material. The results of this study provide a good insight into the potential of CoCrNiFeAl HEAs to be employed in different applications, as the heat treatment improved the corrosion properties and decreased the corrosion rate compared to the as-cast alloys, while the surface hardness was affected negatively by increasing the heat treatment conditions.

Acknowledgments

I would like to begin by expressing my utmost appreciation to Dr. Hamdy Ibrahim, my advisor, for granting me the opportunity to engage in this captivating research. His unwavering guidance, patience, and boundless positivity throughout the project have consistently motivated me and fostered my growth as a confident and self-reliant researcher. Dr. Ibrahim’s expertise, mentorship, and unwavering dedication have played a pivotal role in shaping my academic and research journey. I would also like to extend my deepest gratitude to my thesis committee members, Dr. Ron Goulet and Dr. Mohammad Mahtabi, for their invaluable contributions and insightful feedback. Furthermore, I am sincerely grateful to Dr. Charles Margraves who guided me a lot through the program and went through every detail to ensure a smooth experience for me in the department. I am also grateful to Mrs. Andrea James, an exceptional administrative assistant. Mrs. Andrea has played a pivotal role in supporting this project from its inception, actively providing all the assistance I required. I am immensely grateful for her unwavering help. Finally, I would like to express my gratitude to my family, including my father Nassereldeen Korra, my mother Hanaa Abdou, and my brother Mostafa Korra and his family, for their unwavering support and encouragement throughout my journey. Their genuine prayers have been a source of strength and motivation for me every single day.

Degree

M. S.; A thesis submitted to the faculty of the University of Tennessee at Chattanooga in partial fulfillment of the requirements of the degree of Master of Science.

Date

8-2023

Subject

Alloys--Effect of high temperatures on; Alloys--Corrosion

Keyword

High Entropy Alloys; Corrosion Resistance; Heat Treatment; Microstructure; Hardness; Thermodynamic Modeling CALPHAD

Discipline

Metallurgy

Document Type

Masters theses

DCMI Type

Text

Extent

x, 43 leaves

Language

English

Rights

http://rightsstatements.org/vocab/InC/1.0/

License

http://creativecommons.org/licenses/by/4.0/

Date Available

8-31-2024

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