Microstructure and phase constitution near the interface of Cu/Al vacuum brazing using Al–Si filler metal

Chunzhi, Xia; Li, Yajiang; Puchkov, U.A.; Герасимов, С. А.; Wang, Juan

doi:10.1016/j.vacuum.2007.11.007

Cited by 88 publications

(42 citation statements)

References 7 publications

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“…However, detrimental hard and brittle IMC can easily form at the interface in the fusion welding and brazing process. Additionally, significant surface preparations are required for a successful brazing process of aluminum and copper because of the surface oxides [9]. An ultrasonic welding process, performed by a simple facility, allows for an easy joining in a short time without significant surface preparations, owing to the local frequent friction and extreme deformation experienced at the interface.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Ultrasonic Welded Joint of 1060 Aluminum Alloy and T2 Pure Copper

Liu

Yan-shu

et al. 2017

Metals

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Abstract:The microstructure and mechanical properties of Al/Cu ultrasonic welding joints were investigated. Results show that: (i) the joint strength increased when the welding time increased within a certain range, and a maximal resistant force of 163.04 N was obtained when the welding duration and welding static pressure were 200 ms and 7.2 MPa, respectively; (ii) with a further increase of welding time, the bonding interface was gradually occupied by a thick strip layer of brittle Al 2 Cu (θ 2 ) phase, thus decreasing the strength; (iii) the maximum temperature in the welding region was 360 • C during the welding process, and a recrystallization phenomenon was identified near the welding interface; (iv) the average nanohardness of Cu, the Cu-Al interfacial reaction layer and Al were 1.04 GPa, 1.34 GPa, and 0.53 GPa, respectively, which is consistent with the formation of the intermetallic compound identified by energy-dispersive X-ray spectroscopy (EDS) and XRD analysis.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Ultrasonic Welded Joint of 1060 Aluminum Alloy and T2 Pure Copper

Liu

Yan-shu

et al. 2017

Metals

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“…It is well known that interfacial strength of brazed joint, B-Ni2 in the present research, is directly related to inter-diffusion of elements from brazing filler alloy to either side of it [5][6][7], into NiO-YSZ cermet and 316 stainless steel, which would relieve the stress concentration in the interface. Thus, the elemental distribution of Figure 6c Figure 7b shows that loaded brazed joint thickness has remained almost constant at 100 μm, which did not change very much from Figure 6b.…”

Section: Resultsmentioning

confidence: 82%

“…Although details on grain size in the interfacial layer of fused B-Ni2 filler metal region are not easily distinguishable from the Figures 6b and 7b, it is strongly inferred that the interfacial layer consisted of finer grains than those of 316 stainless steel because an B-Ni2 filler metal alloy completely fused during brazing and subsequently solidified rapidly during fast cooling [5][6][7].…”

Section: Resultsmentioning

confidence: 99%

“…From Figure 7d, it can be seen that significant inter-diffusion of iron and nickel to and from B-Ni2 brazing filler alloy, respectively, occurs in a rather noticeable manner. From EDS analysis, it is possible to estimate that the B-Ni2/NiO-YSZ cermet reaction under moderate loading led to the formation of several distinct phases out of the originally single phase materials and solid solution of nickel and iron presumably formed at the brazed joint [5][6][7]. It is also important to note that EDS analyses tend to overestimate the presence of light elements such as oxygen and chlorine in Figure 7b.…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and Interfacial Morphologies of Brazed NiO-YSZ/316 stainless steel using B-Ni2 brazing alloy

Lee¹,

Kang²,

Hong³

et al. 2010

Materials Testing

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Joining of NiO-YSZ cermet with 316 stainless steel was carried out using B-Ni2 brazing alloy (7 wt.-% Cr, 4.5 wt.-% Si, 3 wt.-% Fe, 3 wt.-% B, 0.06 wt.-% C, 0.02 wt.-% P, Ni-balance, m. p. 972–999 °C), and moderate loading was applied during brazing normal to the joint surface to realize a reliable sealing of the NiO-YSZ cermet anode/316 stainless steel interconnect structure in a SOFC. In the present research, interfacial (chemical) reactions during brazing at the NiO-YSZ/316 stainless steel interconnect were also promoted by addition of an electroless nickel plate to NiO-YSZ cermet as a coating with relevant process variables and procedures optimized during the electroless nickel plating. A special fixture for static loading was designed for filler metal alloy strips to be pre-placed at the joint surface so that during melting of the brazing filler alloy the liquid alloy layer would be perpendicular to the static load direction during brazing. Brazing was performed in a cold-wall vacuum furnace at 1080 °C. Post-brazing examination of interfacial morphologies between NiO-YSZ cermet and 316 stainless steel was performed using the SEM and EDS procedures.The results indicate that the B-Ni2 brazing filler alloy was fused fully during brazing and a continuous interfacial layer formation and the joint integrity were significantly affected by applied static loading during brazing. The positive loading effect was possibly attributed to the rectification of the joints under load by enhanced diffusion of Fe and Ni atoms from 316 stainless steel to B-Ni2 brazing filler alloy and the consequent increase in the fraction of Fe- and Ni-rich intermetallic phases in the joint. The thickness of the interfacial area, however, remained almost constant at 100 ¼m before and after brazing.

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“…Successful vacuum brazing relies on proper technique as well as the furnace capability to continuously control the brazing cycle (vacuum level, heating/cooling rates, temperature, and time). Most related studies discussed dissimilar alloys (Yue et al, 2008;Liu et al, 2012), filler (Ma et al, 2008;Xia et al, 2008;Wang et al, 2003;Zhang, 1994;Miller et al, 2000), cooling rate (Jiang et al, 2010;Li et al, 2006), pressure Li and Wang, 2010) and simulation (Ratts et al, 2000;Zhang and Shi, 2004) in vacuum brazing.…”

Section: Introductionmentioning

confidence: 99%

Optimization of vacuum brazing process parameters in AA6061 using Taguchi method

Lin

Hwang

Fung

2016

JAMDSM

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Vacuum brazing products have excellent joining quality, less deformation and fewer residual stresses. The vacuum brazing technique has significant effect on the microstructure and property of the aluminum brazed joint, but there is little discussion about the optimization of the process. This study investigates how different process parameters affect the tensile properties of 6061-T6 aluminum vacuum brazed joints. The parameters including the soaking temperature, soaking time, brazing temperature, and brazing time were taken into consideration. Analysis of variance showed that soaking time is the most dominant factor. The optimal process parameters were predicted by Taguchi method to obtain the highest tensile strength. Experimental results indicated that the error between predicted and experimental tensile strength is only 0.33%. It demonstrated that the Taguchi method is feasible for obtaining the optimal process parameters of aluminum vacuum brazed joints. Microstructures, microhardness and fractograghs of the aluminum brazed joints produced by optimal process were also analyzed.

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Microstructure and phase constitution near the interface of Cu/Al vacuum brazing using Al–Si filler metal

Cited by 88 publications

References 7 publications

Microstructure and Mechanical Properties of Ultrasonic Welded Joint of 1060 Aluminum Alloy and T2 Pure Copper

Microstructure and Mechanical Properties of Ultrasonic Welded Joint of 1060 Aluminum Alloy and T2 Pure Copper

Microstructure and Interfacial Morphologies of Brazed NiO-YSZ/316 stainless steel using B-Ni2 brazing alloy

Optimization of vacuum brazing process parameters in AA6061 using Taguchi method

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