Abstract
• Precipitate-strengthened non-equal molar Al-Co-Cr-Fe-Ni high entropy alloy was fabricated and characterized. • The high strength and high elongation resulted from the B2 precipitate-strengthened fcc microstructure. • The product of the ultimate tensile strength and elongation was 38 GPa·%. The Al 10 Co 19 Cr 16 Fe 20 Ni 35 high entropy alloy was fabricated and characterized by using transmission electron microscopy and calculation of phase diagram (CALPHAD) method. The microstructure consisted of face-centered cubic (fcc) phase matrix with mainly the B2 precipitates. The product of the ultimate tensile strength and elongation for the designed alloy was 38 GPa·%, which was among the highest of the relevant Al-Co-Cr-Fe-Ni systems. The precipitation strengthening mechanism was evaluated by using Ashby-Orowan model. The high strength and high elongation in the designed Al-Co-Cr-Fe-Ni alloy resulted from the B2 precipitate-strengthened fcc microstructure.
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