首页|The study of mechanical and tribology properties at room- and high-temperature in a (NiCoFe)86.5(AlTi)12(WMoV)1.5 high-entropy alloy
The study of mechanical and tribology properties at room- and high-temperature in a (NiCoFe)86.5(AlTi)12(WMoV)1.5 high-entropy alloy
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NSTL
Elsevier
? 2022 Elsevier B.V.In this study, we prepared (NiCoFe)86.5(AlTi)12(WMoV)1.5 HEA with excellent mechanical properties and tribological properties by vacuum arc melting technology. The results show that the fracture mechanism of the alloy at ambient temperature was ductile fracture, while at high temperature was cleavage fracture. The wear mechanisms of the alloy include abrasive wear and oxidative wear, delamination wear and adhesive wear. The alloy has the excellent tribology property and a good combination of strength and ductility. This enhancement is attributed to the alloy having a relatively high-volume fraction of nano-L12 precipitates, which can effectively hinder the movement of dislocations. The precipitates are highly coherent with the matrix, which can effectively reduce the mismatch degree and the distortion energy of HEA, so the stress concentration problem between the precipitates and the matrix is effectively avoided, thereby improving the strength and wear performance of the alloy. The existence of annealing twins can play a role in grain refinement. During plastic deformation, the dislocation movement can be effectively hindered, and the occurrence of work hardening phenomenon can be delayed to a certain extent, so that the plastic deformation can continue, and play a key role in the wear performance of the alloy. In addition, we found that the oxide film formed on the worn surface of the alloy is more brittle at low temperatures. When the temperature reaches 773 K, a tougher oxide enamel layer was formed on the worn surface, which greatly improves the wear performance of the alloy at high temperatures.
Annealing twinsFriction and wear at high-temperatureHigh-entropy alloysNano-size L12 precipitatesStrength-ductility trade-off
Liang C.、Wang C.、Zhang K.、Liang M.、Xie Y.、Liu W.、Yang J.、Tan H.、Zhou S.
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School of Materials Science and Engineering and Guangxi Key Laboratory of Information Materials and Engineering Research Center of Electronic Information Materials and Devices Ministry of Education Guilin University of Electronic Technology
Affiliated Hospital of Guilin Medical University
Institute of Advanced Wear & Corrosion Resistance and Functional Materials Jinan University
NSTL
Elsevier
