Microstructural evaluation of interfacial intermetallic compounds in Cu wire bonding with Al and Au pads

Kim, Hyung Giun; Kim, Sang Min; Lee, Jae Young; Choi, Myung Suk; Choe, Si Hyun; Kim, Ki Hong; Ryu, Jung Kyu; Kim, Sangshik; Han, Seung Zeon; Kim, Won Yong; Lim, Sung Hwan

doi:10.1016/j.actamat.2013.10.049

Cited by 58 publications

(17 citation statements)

References 23 publications

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“…The thickness of the intermetallic compound layer is a function of temperature and holding time. The atomic diffusion of Cu and Al through the intermetallic compound is the main controlling process for the intermetallic compound growth [12,21]. The analysis results in Figure 21 are analyzed and, in accordance with the literature, the CuAl 2 and Al 4 Cu 9 intermetallic phases are determined in the mixture region.…”

Section: Resultssupporting

confidence: 49%

Effect of Friction Stir Welding Parameters on the Mechanical and Microstructure Properties of the Al-Cu Butt Joint

Çelik

Cakir

2016

Metals

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Friction Stir Welding (FSW) is a solid-state welding process used for welding similar and dissimilar materials. FSW is especially suitable to join sheet Al alloys, and this technique allows different material couples to be welded continuously. In this study, 1050 Al alloys and commercially pure Cu were produced at three different tool rotation speeds (630, 1330, 2440 rpm) and three different tool traverse speeds (20, 30, 50 mm/min) with four different tool position (0, 1, 1.5, 2 mm) by friction stir welding. The influence of the welding parameters on the microstructure and mechanical properties of the joints was investigated. Tensile and bending tests and microhardness measurements were used to determine the mechanical properties. The microstructures of the weld zone were investigated by optical microscope and scanning electron microscope (SEM) and were analyzed in an energy dispersed spectrometer (EDS). Intermetallic phases were detected based on the X-ray diffraction (XRD) analysis results that evaluated the formation of phases in the weld zone. When the welding performance of the friction stir welded butt joints was evaluated, the maximum value obtained was 89.55% with a 1330 rpm tool rotational speed, 20 mm/min traverse speed and a 1 mm tool position configuration. The higher tensile strength is attributed to the dispersion strengthening of the fine Cu particles distributed over the Al material in the stir zone region.

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Section: Resultssupporting

confidence: 49%

Effect of Friction Stir Welding Parameters on the Mechanical and Microstructure Properties of the Al-Cu Butt Joint

Çelik

Cakir

2016

Metals

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“…In particular, to avoid a thermal effect from the curing of the EMCs during the molding process, phase characterization at an early aging time of 0 and 48 h was done with an unmolded Ag-Al bond. The TEM specimens were prepared with a standard in situ method using a dual beam-focused ion beam (FIB), and then, the specimens were finely ion-trimmed following the method of Kim et al [20].…”

Section: Methodsmentioning

confidence: 99%

“…6shows the measured thicknesses values of the IMCs in μm with aging time in (a) h and (b) s 1/2 for the Ag-Al bonds in Green and Normal EMCs during HTSTs at 150 and 175°C. These figures suggest that the growth rate constant of the Ag-Al IMCs, D (cm 2 /s), follows the parabolic equation[20,23]:…”

mentioning

confidence: 97%

Microstructural evaluation and failure analysis of Ag wire bonded to Al pads

Choi

Kim

Lee

et al. 2015

Microelectronics Reliability

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“…The mechanical properties of the welds, castings, sinters and coatings are strongly affected by the type, amount (thickness) and morphology of IMCs due to their hard and brittle nature [1][2][3][4][5][6][7][8][9]. It is well known that the thickness of IMCs should be controlled to less than 10 μm to obtain a sound dissimilar joint, e.g., Al/Mg [5], Al/Ti [6], Al/Cu [7], Mg/steel [8] and Al/steel [9]. Recently, Kim et al [2] found that by controlling the morphology of FeAl-type IMCs in cast steel, the ductility of the steel was significantly enhanced, which could alleviate the harmful effects of the hard and brittle nature of the IMCs.…”

Section: Introductionmentioning

confidence: 99%