Abstract
The L12-strengthened heterostructure Co40Cr20Ni30Mo2Al4Ti4 (at%) high-entropy alloys (HEAs) exhibit excellent tensile mechanical properties over a wide temperature range. In particular, the yield strength of this alloy reaches up to about 1400 MPa from room temperature to 600 °C, which is much higher than that of most alloys. The reasons for the different mechanical behaviors of this alloy above and below the transformation temperature are discussed. Unique super-lattice stacking faults appear in the high-temperature deformed alloys, which may be attributed to the decrease of super-lattice stacking fault energy when the temperature increases. In the present work, the deformation mechanisms of precipitation-strengthened HEAs at high temperatures are preliminarily explored, which has guiding significance for the development of advanced high-temperature structural materials.
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