4.7 Article

Microstructural evolution and mechanical properties of AlCoCrFeNi high-entropy alloy joints brazed using a novel Ni-based filler

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 860, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157926

Keywords

High-entropy alloys; Brazing; Microstructure; Mechanical property

Funding

  1. National Natural Science Foundation of China [51705457, 51975530]
  2. Key Laboratory of Safety Engineering and Technology Research of Zhejiang Province
  3. Shengzhou$Zhejiang University of Technology Institute of Innovation Research [Z2020002]

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A high-performance high-entropy alloy (HEA) brazed joint with a microstructure similar to the base metal was successfully fabricated through proper interface control. The joint shear strength was significantly improved with a strengthening mechanism involving high-entropy solid solution, precipitation strengthening, and grain refinement. The brazed joint exhibited desirable high-temperature stability with minor degradation of strength after annealing, showing great potential for high temperature applications.
This paper reported a route to fabricate a high-performance high-entropy alloy (HEA) brazed joint with the fusion zone similar to the base metal, in which the brazing of a Ni-containing AICoCrFeNi HEA using a novel Ni-based filler was investigated at 1150-1350 degrees C for 0-45 min. A microstructure similar to the base metal was received in the fusion zone through proper interface control, thus the joint shear strength obtained was approximately three times (687.2 +/- 23.2 MPa) in contrast to that of the joint with the heterogenous interface (199.4 +/- 2.8 MPa). The strengthening mechanism was attributed to the high-entropy solid solution, precipitation strengthening and grain refinement occurring in the joint. The highest joint strength of 687.2 +/- 23.2 MPa was received at 1300 degrees C for 15 min with the fracture mainly happening in the base metal. The brazed joint exhibited desirable high-temperature stability with minor degradation of joint strength (similar to 3%) after annealing of 800 degrees C for 240 h. The excellent joint performances are potential for high temperature applications. (C) 2020 Elsevier B.V. All rights reserved.

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