Design of Compositionally Complex Alloys Using Low-Cost Metals for Marine Applications

Funds are provided to determine the phase behavior, microstructures, and the influence of alloy chemistry in AlCrFeMn compositionally complex alloys (CCAs) by measuring the thermodynamic properties (Gibbs energy) of CCAs at 450~850 ~C via electromotive force (emf) measurements and establish the phase behavior and thermodynamic properties of Alx(CrFeMn)1-x alloys at various Al mole fractions (0 ~ xAl ~ 0.25) with Al as a primary phase modifier; to characterize the interfacial corrosion properties of AlCrFeMn CCAs using corrosion cells in chloride-containing solutions (0~1.5 M NaCl, pH 3~8), and to measure the mechanical properties of AlCrFeMn CCAs, including hardness, elastic modulus, yield strength using the nano/micro-indentation technique, and to compare to those of 304 stainless steel as a baseline, as well as the susceptibility to hydrogen damage.