Stress Corrosion Cracking of TRIP Fe_(39)Mn_(20)Co_(20)Cr_(15)Si_5Al_1 (at.) High Entropy Alloy

摘要

Stress corrosion cracking (SCC) can adversely affect the life of any engineering component. The study of high entropy alloys (HEA) shows excellent mechanical properties but SCC susceptibility is unknown. We have studied SCC behavior of a transformation-induced-plasticity (TRIP) Fe_(39)Mn_(20)Co_(20)Cr_(15)Si_5Al_1 (at.%) HEA in 3.5 wt% NaCl solution using slow strain-rate tensile testing (SSRT) on smooth tensile specimens along with the electrochemical behavior of the alloy. The microstructural characterization of the alloy was carried out in as-received condition and after corrosion test using advanced characterization tools including X-ray photoelectron spec-troscopy. The polarization test of the alloy done in 3.5 wt% NaCl solution revealed corrosion current density as 8.05 × 10~(-8) A/cm~2, markedly lower than the 304 stainless steel (76 × 10~(-8) A/cm~2). The pitting potential of the alloy was 0.089 V. The SSRT result shows a decrease in the elongation and ultimate tensile strength. Further, experiments are in-progress to understand mechanistic origin of decrease in ductility of the alloy.