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

Li, Huaxin; Shen, Weijian; Chen, Weijian; Wang, Weizhen; Liu, Guohao; Lu, Chuanyang; Zheng, Wenjian; Ma, Yinghe; Yang, Junxiao; Ding, Zhenyu; Zou, Hai; He, Yanming

doi:10.1016/j.jallcom.2020.157926

Cited by 23 publications

(6 citation statements)

References 32 publications

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“…In order to solve this problem, a variety method of ceramic-metal joining methods have been studied, including brazing [11,12], diffusion welding [13,14], partial transient liquid phase bonding (TLP) [15,16] etc. Among all kinds of joining technologies, brazing has become the most effective method to combine ceramic and metal due to its advantages of low joining temperature, low pressure and unlimited joining forms [17][18][19]. However, the poor wettability and high residual stress of the ceramic-metal joint are two main problems that restrict its application.…”

Section: Of 12mentioning

confidence: 99%

Microstructure and Shear Strength of Brazing High Entropy TiZrHfNbMo Alloy and Si3N4 Ceramics Joints

et al. 2021

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The effects of different brazing processes on the interfacial microstructure and shear strength of TiZrHfNbMo high-entropy alloy (HEAS) and Si3N4 ceramic brazed joints were studied. There is no obvious defect in a brazed TiZrHfNbMo HEAS/AgCuTi/Si3N4 ceramic joint, and the two materials have good metallurgical bonding. The typical interface microstructure is Si3N4/Ti5Si3/Ag solid solution +Cu (s,s)+ CuTi/Cu2Ti/Cu4Ti + TiCu(Hf,Zr)NbMo/TiZrHfNbMo HEAs. With the increase of brazing temperature, the dispersed CuTi phase agglomerates in the brazed joint, and acts as the nucleate of the Cu-based solid solution. The thickness of the reaction layer increases with the increase of phases in the reaction layer on both sides of the joint. When the brazing temperature is 800 °C, 820 °C, 840 °C and 860 °C, the shear strength of the brazed joint is 30 MPa, 72 MPa, 86 MPa and 21 MPa, respectively. The formation of CuTi and Ti5Si3 intermetallic compounds increases the thickness of the reaction layer, and improves the strength of the joint. However, excessive CuTi and Ti5Si3 intermetallic compounds lead to a significant decrease in joint strength. The grain coarsening of the joint can also affect the strength of the joint.

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Section: Of 12mentioning

confidence: 99%

Microstructure and Shear Strength of Brazing High Entropy TiZrHfNbMo Alloy and Si3N4 Ceramics Joints

et al. 2021

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“…It has been reported that the HEAs filler [19,20] can increase the mixing entropy of brazed joints, so that the joint structure forms a solid solution structure rather than brittle IMCs [21]. However, the HEAs filler has a higher melting point (Tm), the doping of the Tm depressant elements into fillers was applied [22], but the Tm was still much higher than that of most current mainstream Ni-based fillers [23], and it should be clearly known that the Tm of solder should be much lower than that of the base metal (BM) (BM), otherwise it will border the industrialization of the HEAs filler.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of formation mechanism of dual-phase (AlCoCrFeNi)X HEAs brazed joints by reactive Ni/Al nano-multilayers

et al. 2023

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The FCC + BCC dual-phase solid solution structure was obtained in the Al0.1CoCrFeNi /304SS brazed joints using Ni/Al reactive multilayer nano-foils, which was proved by combining experiment with simulation. In this study, Finite Element Analysis was achieved to analyzing the diffusion behavior across brazing joints, which were subsequently interrelated with the formation mechanism of the brazed micro-structures during the brazing process. During brazing, the joint interface is tightly bonded and the atoms were diffused sufficiently to form the solid solution zone. The representative microstructure of the joint mainly comprised hard BCC (Al-Ni) + ductile FCC (Co-Fe-Cr) dual-phase. The successful use of nano-multilayer foils as a HEAs fillers design can broaden the application range of HEAs and provide a novelty procedure for brazing 304SS and Al0.1CoCrFeNi HEAs, and is developing a novel field in manufacture of HEAs-related joints.

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“…In the view of a real application of HEAs, it appears of paramount importance to develop a solid knowledge about the joining of semi‐finished components made of the alloys themselves. Several works have addressed different joining techniques, including brazing, [ 8–10 ] friction stir welding, [ 11,12 ] diffusion bonding, [ 13,14 ] tungsten arc welding, [ 15 ] electron beam welding, [ 16,17 ] and laser welding, [ 18,19 ] and some review papers dealing with this topic have been published, too. [ 20–24 ] Moreover, large attention has been devoted to the dissimilar joining of HEAs to conventional alloys [ 25 ] and the use of HEAs as filler materials has been actively explored as well: [ 10,26 ] their thermal stability and good ductility have been particularly appreciated when joining refractory materials, and the sluggish diffusion effect has been exploited to prevent the formation of brittle intermetallics.…”

Section: Introductionmentioning

confidence: 99%

Laser Beam Welding of CoCuFeMnNi High Entropy Alloy: Processing, Microstructure, and Mechanical Properties

et al. 2022

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The present work explores the feasibility of joining the CoCuFeMnNi high entropy alloy by laser beam welding. An appropriate feasibility window is identified, and the optimal process parameters (300 W power, scanning speed 20 mm s−1, spot size 0.45 mm) are related to the properties of the studied material. Cu's tendency to segregate from other alloying elements is found to dominate the microstructural evolution: the welding process induced the formation of Cu‐rich second phases within the melted zone (MZ), as interdendritic phase, as well as in the heat‐affected zone (HAZ) as grain boundary phase. Mechanical resistance of the welded beads and the HAZs was improved (187 HV on average) over one of the base materials (BMs) (160 HV on average) owing to the formation of Cu‐rich phases and solidification stresses. Consequently, tensile strength (576.4 MPa) and elongation to failure (28.3%) are almost the same as in the BM. Indeed, failure during tensile tests always took place outside the welded bead, therefore confirming the extreme soundness of the performed laser beam welding. Such results confirm that laser welding may be safely applied to relatively complex high entropy alloys (HEA), thus easing their practical application.

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

Cited by 23 publications

References 32 publications

Microstructure and Shear Strength of Brazing High Entropy TiZrHfNbMo Alloy and Si3N4 Ceramics Joints

Microstructure and Shear Strength of Brazing High Entropy TiZrHfNbMo Alloy and Si3N4 Ceramics Joints

Experimental and Numerical Study of formation mechanism of dual-phase (AlCoCrFeNi)X HEAs brazed joints by reactive Ni/Al nano-multilayers

Laser Beam Welding of CoCuFeMnNi High Entropy Alloy: Processing, Microstructure, and Mechanical Properties

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