Abstract
The development of traditional alloy materials has reached the bottleneck due to the constructive interaction between strength and plasticity. Hence, novel alloy systems like (FeCoNi)86Al7Ti7 high-entropy alloys (HEAs) were fabricated using selective electron beam melting (SEBM). The (FeCoNi)86Al7Ti7 HEA dominantly consisted of ordered L12 and disordered fcc matrix phases. The bottom surface (SEBM-bottom)) of the (FeCoNi)86Al7Ti7 HEA blocks presents an equiaxed microstructure; however, coarse columnar grains across layers were observed along the building direction (SEBM-side). Island-like precipitates (ILPs) are distributed evenly within the equiaxed grain. The boundaries of columnar grains and high-density multicomponent cubic nanoparticles (MCCNPs) are dispersed uniformly in the matrix. A strong< 100 > // building direction (BD) fiber texture can be observed. The (FeCoNi)86Al7Ti7 HEA exhibits superior strengths of 2048 MPa and up to 12% ductility at ambient temperature. However, the SEBM (FeCoNi)86Al7Ti7 HEA exhibits anisotropy in its mechanical properties.
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