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Microstructural evolution and mechanical properties of AlCoCrFeNi high-entropy alloy joints brazed using a novel Ni-based filler.
- Source :
-
Journal of Alloys & Compounds . Apr2021, Vol. 860, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- 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 AlCoCrFeNi HEA using a novel Ni-based filler was investigated at 1150–1350 °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 °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 (∼3%) after annealing of 800 °C for 240 h. The excellent joint performances are potential for high temperature applications. • A high-quality AlCoCrFeNi high-entropy alloy brazed joint with the fusion zone similar to the base metal was achieved. • The brazed joint exhibited a desirable high-temperature stability with minor degradation of joint strength after high-temperature annealing. • The mechanisms of interfacial phase evolution and joint strengthening were discussed. [ABSTRACT FROM AUTHOR]
- Subjects :
- *BRAZED joints
*BRAZING
*GRAIN refinement
*ALLOYS
*BRAZING alloys
*FILLER materials
Subjects
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 860
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 148383280
- Full Text :
- https://doi.org/10.1016/j.jallcom.2020.157926