Abstract
A compositional approach to designing alloys that have an enlarged equiaxed zone is suggested in this study. The partitioning of elements during the solidification of CoCrFeMnNi high-entropy alloy (HEA) was confirmed through a directional solidification quenching experiment. Several HEAs were designed to maximize the effects of constitutional and thermal undercooling by considering factors including solute enrichment at the columnar front and the melting temperatures and thermal conductivities of the individual elements. The newly designed HEAs were shown to have successfully enlarged equiaxed zones, and improved anisotropic properties.
Highlights
High-entropy alloys (HEAs), which are composed of five or more elements in equiatomic or nearly equiatomic ratios [1,2], are regarded as base materials for high-performance alloys due to their novel properties [3,4,5]
We suggested a compositional approach to designing a HEA with a large portion of equiaxed grains by considering element partitioning during solidification
The HEA round bar for the directional solidification quenching (DSQ) experiment was machined from the ingot
Summary
High-entropy alloys (HEAs), which are composed of five or more elements in equiatomic or nearly equiatomic ratios [1,2], are regarded as base materials for high-performance alloys due to their novel properties [3,4,5]. Previous studies have focused on HEAs made using small-scale casting methods, such as arc melting [5,6]. Its macrostructure was composed of a considerable amount of columnar structures, with only a few equiaxed structures in the center [7]. This type of macrostructure is known to degrade workability during the subsequent forming processes, because it induces significant deformation anisotropy. Controlling the casting conditions is the general method used to enlarge the equiaxed zone of the castings [10]. Control of the chemical composition in addition to the casting conditions is needed to obtain a substantial enlargement of the equiaxed zone. New HEAs were designed based on the present method, and their macrostructures and deformation anisotropies were confirmed by comparing them with those of equiatomic CoCrFeMnNi HEAs
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