Abstract
In this study, CoCrFeNiAl0.2(TiC)x (x = 0,0.06,0.12,0.2) composites were prepared by high-gravity combustion synthesis (HGCS). The mixture powders of several low-cost metal oxides (Co2O3, Cr2O3, Fe2O3, NiO), Al, Ti and C were used as raw materials. In the high-gravity field, the CoCrFeNiAl0.2 high-entropy alloys (HEAs) were obtained by inducing a thermic reaction between the several low-cost metal oxides (Co2O3, Cr2O3, Fe2O3, NiO) and Al powders. Then the TiC was in-situ synthesized by Ti and C powders. The results show that the size and distribution of the in-situ synthesized TiC can be controlled by adjusting the Ti and C additions and the value of high-gravity field. When the high-gravity field rises to 1200 g, the bending strength, compressive strength and specific strength of CoCrFeNiAl0.2(TiC)0.12 composites respectively up to 1.17 GPa, 2.13 GPa, 0.3 MPa·Kg?1·m?3. Therefore, the HGCS with ‘green’ and efficiency characteristics offers an alternative pathway to control the structure and properties of the ceramic/ HEAs composites.
NSTL
Elsevier