Hierarchical microstructure for improved fatigue properties in a eutectic high entropy alloy

By S. Shukla, Tianhao Wang, S. Cotton, Rajiv S. Mishra. Scripta Materialia, 2018

138 citations recorded by the source corpus.

Abstract Microstructural hierarchy can enable enhanced properties in high entropy alloys. A unique microstructure was observed in 50% cold-rolled and heat-treated eutectic high-entropy alloy (EHEA). Formation of recrystallized FCC grains and B2 precipitates in FCC lamellae with different microstructural length scale constitute the hierarchy in cold-rolled and heat-treated EHEA. Monotonic loading and high cycle fatigue properties of both microstructures were compared. In as-cast microstructure, the fatigue crack originated in FCC lamellae with the formation of persistent slip bands. The B2 precipitates in cold-rolled and heat-treated alloy delayed the crack initiation and improved fatigue properties.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/43488b9e82c1eec7be8233bd01371c60268ba152