Abstract
In-situ TiC particulate reinforced CrMnFeCoNi0.8 high entropy alloy (HEA) matrix composites were prepared by induction melting method. The effect of TiC content upon the microstructure and tensile properties of as-cast samples were analyzed and discussed. The HEA matrix has single-phase face-centered cubic (FCC) structure, determined by X-ray diffraction (XRD) pattern. Compared to the CrMnFeCoNi0.8 matrix, 7.5 vol%TiC/CrMnFeCoNi0.8 composite possessed remarkable yield strength (517.1 MPa vs 240.9 MPa), ultimate tensile strength (926.2 MPa vs 527.5 MPa) and excellent uniform elongation (38.0%). Strong dislocation interactions, load-bearing effect and Orowan mechanism afforded by in-situ TiC particles, together with solid-solution strengthening via C and Ti elements, are responsible for the strength enhancement.
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