Doctoral Dissertations
Synergistic Fatigue Performance in High Entropy Alloys with Novel Precipitates and Metastable Phases
Date of Award
5-2023
Degree Type
Dissertation
Degree Name
Doctor of Philosophy
Major
Materials Science and Engineering
Major Professor
Peter K. Liaw
Committee Members
Yanfei Gao, Hahn Choo, Katharine Page, Chad Duty
Abstract
Recently, a new concept of the alloying-design strategy, called high-entropy alloys (HEAs), has been developed. Unlike traditional alloys based on one element as the principal component, HEAs are designed with four or more principal elements. The HEAs have been regarded as promising alloys with excellent mechanical properties. However, most of the investigations focused on the tensile or compressive behaviors, and the fatigue properties of HEAs are still not well studied. The goal of our proposed research is to investigate the low cycle fatigue behaviors of HEAs and try to explore the stronger HEAs with excellent fatigue resistance by introducing multicomponent nanosized precipitates and phase transformations. The combination of the in-situ diffraction techniques and micromechanical models is used to establish the relationship between macroscopic properties and microstructural mechanisms during low cycle fatigue tests. This investigation could accelerate the engineering applications of HEAs.
Recommended Citation
Lyu, Zongyang, "Synergistic Fatigue Performance in High Entropy Alloys with Novel Precipitates and Metastable Phases. " PhD diss., University of Tennessee, 2023.
https://trace.tennessee.edu/utk_graddiss/11556