Effects of intermetallic compound on the electrical and mechanical properties of friction welded Cu/Al bimetallic joints during annealing

Lee, Wonbae; Bang, Kuek-Saeng; Jung, Seung‐Boo

doi:10.1016/j.jallcom.2004.07.057

Cited by 329 publications

(117 citation statements)

References 4 publications

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“…The relationship between the intermetallic thickness and the annealing time can be expressed as To understand the intermetallic growth, isothermal treatments were performed on the Cu/Al joints that were gently welded with an ultrasonic welder. The isothermal treatments were conducted on the pre-welded samples at 633 K for 1-32 h. The IMC thickness measurements for the isothermal heat treatment at 633 K were compared to the results obtained by Lee et al [21], as shown in Figure 4b. It is obvious that the increase in the average IMC thickness with the annealing time conforms to the parabolic growth law.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

Effects of Vibration Amplitude on Microstructure Evolution and Mechanical Strength of Ultrasonic Spot Welded Cu/Al Joints

Liu

Biao

Yang

2017

Metals

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Abstract:The effects of vibration amplitude on the interface reaction and mechanical strength of the Cu/Al joints were systematically investigated in ultrasonic spot welding (USW) experiments. The appropriate vibration amplitude (22.5 µm) was beneficial for obtaining a sound joint. The formation of the continuous intermetallic compounds (IMC) layer accelerated with a higher vibration amplitude. The lap shear tensile strength of the Cu/Al joints decreased when the thickness of the intermetallic layer was greater than 1 µm at various amplitudes. With the increase in welding time, a crack occurred in the copper side owing to the occurrence of the eutectic reaction, α-Al + θ → L, at the periphery of the nugget. The remarkable decline of ultrasonic power curves occurred at various amplitude levels upon the formation of a crack in the copper side.

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Section: Microstructure Evolutionmentioning

confidence: 99%

Effects of Vibration Amplitude on Microstructure Evolution and Mechanical Strength of Ultrasonic Spot Welded Cu/Al Joints

Liu

Biao

Yang

2017

Metals

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“…Furthermore, the Cu/Al dissimilar metal joints are extensively applied in the electricity, packaging, ground, and space vehicles industry due to desired thermal and electrical conductivity [5]. Lee et al [6] have researched the electrical and mechanical properties of friction welded Cu/Al bimetal joints. Asemabadi et al [7] have investigated the mechanical properties of explosive-welded Cu/Al bimetal.…”

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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“…7b). Hence, it is desirable to be set of an opportune friction time which generate less mechanically mixed layers of the joint because that layer will be affected to the joint strength (Aritoshi, et al, 1991;Kimura, et al, 2011Kimura, et al, , 2015 in addition to the IMC interlayer as reported by some researchers (Nakanishi, et al, 1976;Lee, et al, 2005;Chen, et al, 2006;Saeid, et al, 2010;Wei, et al, 2016). However, all joints fractured from the weld interface as shown in Fig.…”

Section: Transitional Changes Of Weld Interfacementioning

confidence: 94%

Effects of friction welding conditions on tensile strength of friction welded joint between 5052 Al alloy and pure copper

Kimura

Inui

Kusaka

et al. 2018

Mechanical Engineering Journal

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This paper described the tensile strength of friction welded joint between Al-Mg alloy (JIS A5052) and pure copper (OFC). In particular, the joining phenomena during the friction process and the effects of friction welding condition such as friction pressure, friction time and forge pressure on the joint strength have been investigated, and the metallurgical characteristics of joints have been also observed and analyzed. The adjacent region of the weld interface at the A5052 side was upset during the friction process, although that of the OFC side was hardly upset. When the joint was made with a friction pressure of 30 MPa, all joints fractured at the weld interface because those joints had the not-joined region at this portion. To reduce the not-joined region, the joint was made with increasing forge pressure. All joints did not have a joint efficiency of 100% (same tensile strength as the A5052 base metal) and the fracture on the A5052 base metal without crack at the weld interface, although the joint efficiency increased with increasing forge pressure. It was showed that the joint had the mechanically mixed layer as the lamellar structures of A5052 and OFC on the adjacent region of the weld interface at the A5052 side, and that layer influenced to the fractured point of the joint. The mechanically mixed layer decreased with decreasing friction time and with decreasing friction pressure after the initial peak. Then, the joint, which had the same tensile strength as the A5052 base metal, the fracture on the A5052 base metal with no crack at the weld interface, and less mechanically mixed layer with no the intermetallic compound (IMC) interlayer on the weld interface, could be successfully achieved. In conclusion, it was suggested that the joint should be made with a low friction pressures such as 20 MPa to prevent generating of the mechanically mixed layer, an opportune friction time such as 6.0 s without generating the IMC interlayer, and a high forge pressure such as 240 MPa in order to achieve completely joining of the weld interface and the fracture on the A5052 base metal.

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Effects of intermetallic compound on the electrical and mechanical properties of friction welded Cu/Al bimetallic joints during annealing

Cited by 329 publications

References 4 publications

Effects of Vibration Amplitude on Microstructure Evolution and Mechanical Strength of Ultrasonic Spot Welded Cu/Al Joints

Effects of Vibration Amplitude on Microstructure Evolution and Mechanical Strength of Ultrasonic Spot Welded Cu/Al Joints

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

Effects of friction welding conditions on tensile strength of friction welded joint between 5052 Al alloy and pure copper

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