Abstract
AlCoCrFeNiTi high-entropy alloy coatings (HEACs) were prepared by mechanical alloying (MA) and laser cladding (LC) process on H13 hot-working die steel substrate. Phase evolution, microstructure, and mechanical properties of the alloyed powder and HEACs were investigated in detail. The final milling AlCoCrFeNiTi coating powders exhibited simple body centered cubic (BCC) phase and mean granular size of less than 4 μm. With the increase of heat input of the laser, partial BCC phase transformed into minor face centered cubic (FCC) phase during LC. AlCoCrFeNiTi HEACs showed excellent metallurgical bonding with the substrate, and few defects. Moreover, the microhardness of AlCoCrFeNiTi HEACs reached 1069 HV due to the existence of the hard oxidation and the second phase grains, which are about five times that of the substrate. The laser surface cladding HEACs exhibited deteriorated tensile property compared with that of the substrate and the fracture generally occurred in the region of HEACs. The fracture mechanism of AlCoCrFeNiTi HEACs was dominated by the comprehensive influence of brittle fracture and ductile fracture.
Highlights
In recent years, multi-component high-entropy alloys (HEAs) put forward by Yeh et al have attracted wide interest and attention from different fields due to their excellent performances, and the mechanism is worth exploring [1,2,3]
HEAs tended to produce simple body centered cubic (BCC) and face centered cubic (FCC) solid solutions and, reduced the numbers of phases, which can be attributed to the influence of the high configuration entropy in HEAs [4,5,6,7]
AlCoCrFeNiTi high-entropy alloy coatings (HEACs) possess much greater hardness than the substrate, which can be attributed to two major reasons
Summary
Multi-component high-entropy alloys (HEAs) put forward by Yeh et al have attracted wide interest and attention from different fields due to their excellent performances, and the mechanism is worth exploring [1,2,3]. HEAs tended to produce simple body centered cubic (BCC) and face centered cubic (FCC) solid solutions and, reduced the numbers of phases, which can be attributed to the influence of the high configuration entropy in HEAs [4,5,6,7] The outstanding properties, such as high microhardness and tensile strength [8,9], excellent wear resistance [10,11,12], superior corrosion resistance [13,14], and unique magnetic properties [15,16], offer potential applications for HEAs. The strict correlation between mechanical property and the microstructure of HEAs have been studied by many scholars. Phase evolution, microstructure of AlCoCrFeNiTi HEAs during MA, and LC processes under different parameters were intensively investigated, as well as mechanical properties and microstructure of HEACs after LC
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