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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.

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Date: Tuesday, May 29, 2018

Time: 8:30 A.M.

Place: ARMS 1021