Please consider attending the following: MATERIALS ENGINEERING SEMINAR "Solid-Solution Strengthening in FCC Concentrated Complex Alloys" By Chia-Hsiu Chang Purdue MSE M.S. Final Exam Advisor: Professor Michael S. Titus ABSTRACT Concentrated complex alloys (CCAs) were recently proposed as a novel class of new alloys, and they are defined as alloys composed of four or more alloying elements without a majority concentration or "base" element, for example Co1Fe1Mn1Ni1. Oftentimes, researchers aim to synthesize CCAs exhibiting a single solid-solution phase (e.g. fcc or bcc) because of the significant solid-solution strengthening provided by the high concentration of many solute elements. However, the strengthening mechanisms of CCAs are not clear at present. A new theory for predicting the yield strength of fcc CCAs has recently developed. Our study hypothesizes that CCAs could be treated as pseudo-binary alloys, in which the "solvent" is a given CCA and the solute is the final alloying element, and comparisons between predicted and experimental results based on the new model will be discussed. . Date: Tuesday, May 29, 2018 Time: 8:30 A.M. Place: ARMS 1021