Abstract
The FeCoNiCrAl0.1 high entropy alloys (HEAs) and pure copper (Cu) composite plates were successfully fabricated by the explosive welding technique using two different gap distances. The interfacial microstructure, elemental distribution, grain structure of vortex zone and hardness were characterized using optical microscopy (OM), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), nanoindentation and micro-hardness tester. The explosive weldability window was calculated to verify the weldability of HEAs and Cu. The results indicated that the Cu/HEA composites presented typical wavy structures without visible defects and have an excellent bonding quality. The elements mixed and formed intermetallic compounds at the vortex zones. The grains near the vortex zones showed strong deformation, and phase transformation occurred. Compared with the matrix metals, the hardness of Cu and HEAs increased near the welding interface and sharply increased to 375 HV near the vortex zone.
Highlights
High entropy alloys (HEAs) are novel metals with high mixing entropy, which are broadly defined as a solid solution alloy containing more than five main elements equal to or near equal to the atomic percentage [1]
The nominal composition of the high-entropy alloys (HEAs) used in this paper is FeCoNiCrAl0.1
During the extend welding (EXW) processes, the kinetic energy of the Cu plate was converted into potential energy by colliding with the HEAs plate
Summary
High entropy alloys (HEAs) are novel metals with high mixing entropy, which are broadly defined as a solid solution alloy containing more than five main elements equal to or near equal to the atomic percentage (at.%) [1]. HEAs have attracted increasing attention regarding their special composition and excellent mechanical properties, such as high fracture toughness, combined strength-ductility performance, significant fatigue resistance, excellent radiation resistance [2]. Due to its slow defect formation kinetics under heavy radiation doses, HEAs can possibly replace the structural materials currently available in nuclear power and high-efficiency thermal power plants in the future [3,4]. Due to the differences in the physical and chemical properties of dissimilar. Coatings 2020, 10, x FOR PEER REVIEW. Coatings 2020, 10, 1197 during welding heating and cooling. Tensile residual stress that is difficult to remove may metals, there are welded many technical problems in the welding the huge difference in the be generated in the joint [5]
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