Effect of heat treatment on microstructure and properties of Al0.5CoCrFeNi high-entropy alloy brazed joints

doi:10.13251/j.issn.0254-6051.2022.05.033

Abstract

Abstract: Al_0.5CoCrFeNi high-entropy alloy was brazed and connected with TiZrCuNi solder and then annealed, the effect of annealing time at 800 ℃ on microstructure and mechanical properties of the Al_0.5CoCrFeNi high-entropy alloy brazed joint was studied. The microstructure and phase composition of the brazed joints were analyzed by means of scanning electron microscope (SEM) and energy dispersive spectroscope (EDS). The shear strength of the specimens before and after heat treatment was measured by universal testing machine. The results show that the typical microstructure of brazed joint can be divided into weld zone, fusion zone and heat affected zone. The microstructure of weld zone mainly consists of high-entropy alloy phases and FeCr based solid solution with BCC structure. With the increase of annealing time, fine black phase gradually precipitates from the gray phase in the brazing seam, which has a certain dispersion strengthening effect on the joint, and the microstructure is finer and uniform. The shear strength of brazed joint increases from 554.8 MPa before annealing to 581.1 MPa after annealing at 800 ℃ for 12 h.

Key words: vacuum brazing, TiZrCuNi solder, Al_0.5CoCrFeNi high-entropy alloy, annealing, connection performance

CLC Number:

TG454

Qi Haowei, Liu Xuewen, Liu Le, Cao Zhiming, Jia Dehao, Zhang Qiang. Effect of heat treatment on microstructure and properties of Al_0.5CoCrFeNi high-entropy alloy brazed joints[J]. Heat Treatment of Metals, 2022, 47(5): 199-203.

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Effect of heat treatment on microstructure and properties of Al_0.5CoCrFeNi high-entropy alloy brazed joints

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