PROCESSING AND PROPERTIES OF Al0.3CrCuFeNi2 SINGLE CRYSTAL HIGH-ENTROPY ALLOY

The high-entropy alloy is a class of new metal material, its dominant element is generally more than three, and its mixing entropy is high and easy to form a solid solution structure. A large number of investigations show that high-entropy alloy possess excellent high temperature phase stability and softening resistance, which is superior to traditional superalloy. The Al0.3CrCuFeNi2 high-entropy alloy is studied by using once Bridgman solidification at different draw rates (10, 30 and 150 mu m/s) and twice Bridgman solidification at 10 mu m/s draw rate, the corresponding microstructure are analyzed. The EBSD technique is applied to detect the alloy growth orientation and grain boundary misorientation angle of alloys by once and twice Bridgman solidification at 10 mu m/s draw rate. The room temperature tensile mechanical properties of Al0.3CrCuFeNi2 high-entropy alloy by twice Bridgman solidification at 10 mu m/s draw rate and suction casting are studied. The results show that the primary spacing of dendritic of Al0.3CrCuFeNi2 high-entropy alloy by Bridgman solidification at 10 mu m/s draw rate is larger than other draw rates and suction casting, while the growth orientation angle of dendrite dry is smaller than others. The orientation is close to the < 001 > direction after twice Bridgman solidification at 10 mu m/s draw rate, and most of grain boundary misorientation angle are less than 5 degrees. Compared with suction casting samples, yield strength, tensile strength and elongation of Al0.3CrCuFeNi2 high-entropy alloy by using twice Bridgman solidification increased by 34.6%, 10.2% and 40%.