Effect of Solidification Rate on the Microstructure and Strain-Rate-Sensitive Mechanical Behavior of AlCoCrFeNi High-Entropy Alloy Prepared by Bridgman Solidification

Abstract

AlCoCrFeNi high-entropy alloys (HEAs) were prepared by Bridgman solidification with different solidification rates, and the mechanical behavior of the HEAs was investigated over a wide strain rate range (³10 ¹3 ³10 3 s ¹1). Microstructure observations suggest that, with increasing solidification rate, the microstructure evolves from coarse columnar grains to fine equiaxed ones. Through compression tests under both quasistatic and dynamic strain rates, the AlCoCrFeNi HEAs were found to possess positive strain-rate sensitivity (SRS), and the HEA with lower solidification rate exhibits higher SRS, which are attributed to the coarse grain size.

Phase assemblage and properties of laser cladded TixCrFeCoNiCu high-entropy alloy coating on aluminum

“…The number of principal components in HEA is at least 5, and the mole fraction of each element is between 5% and 35% [10]. Existing research results show that HEAs do not tend to form a wide variety of hard and brittle intermetallic compounds after solidification [11][12][13]. Due to the high mixed entropy effect, it is easier to generate single-phase or dual-phase mixed structures with simple face-centered cubic, or body-centered cubic.…”

Numerical Simulation of Solidification Structures of Ag–28Cu–1Ni Alloy through Continuous Casting Based on Three-Dimensional CAFE Method

“…And the solidification structure of the casting determines the mechanical properties and forming quality of the casting. 1,2) Therefore, it is of actual significance to study the solidification microstructure.…”