Tensile and Fatigue Behavior of Al-1Si Wire Used in Wire Bonding

Danaher, F. D.; Williams, Jason; Singh, Davinder; Jiang, Ling; Chawla, Nikhilesh

doi:10.1007/s11664-011-1592-2

Cited by 6 publications

(2 citation statements)

References 12 publications

(12 reference statements)

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“…There are numerous technical reports describing the tensile and yield strengths. (2)(3)(4)(5)(6)(7)(8) The effect of annealing on these mechanical characteristics has also been reported. (6)(7)(8) However, discussions of Young's modulus are scarce because precise measurement of the displacement of the bonding wire during the tests is required for the derivation of Young's modulus.…”

Section: Introductionmentioning

confidence: 99%

Effect of Vacuum Annealing on Tensile Mechanical Characteristics of Au Bonding Wires

2016

Sensors and Materials

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In this paper, the effect of vacuum annealing on the mechanical properties of Au bonding wires is described. Au bonding wires with a diameter of 25 μm are subjected to quasi-static uniaxial tensile tests in laboratory air. The bonding wire specimens are prepared by attaching a wire to a Si frame fabricated by deep reactive ion etching (DRIE). The mean Young's modulus and 0.2% offset yield strength are 114 GPa and 354 MPa, respectively. By annealing at 100-300 °C for 10 min in vacuum, Young's modulus gradually decreases with increasing annealing temperature, whereas yield strength rapidly decreases in the annealed wires at temperatures above 200 °C. The annealing effect is discussed on the basis of the change in the number of recrystallized grains in the wires.

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Section: Introductionmentioning

confidence: 99%

Effect of Vacuum Annealing on Tensile Mechanical Characteristics of Au Bonding Wires

2016

Sensors and Materials

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“…The interest has been sparked by continued progress in the miniaturization of components for microelectronic applications, [1,2] synthesis of nanostructured materials for biomedical scaffolds, [3,4] as well as the recognition that many biological tissues and fibers exhibit superlative mechanical performance. [5][6][7] A good example is the sustained effort in characterizing, synthesizing, and understanding the behavior of spider silks, many of which are stronger than steel and exhibits higher toughness than Kevlar.…”

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confidence: 99%

Continuous dynamic analysis: evolution of elastic properties with strain

Basu

Hay

Swindeman³

et al. 2014

MRS Communications

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Mechanical strain triggers changes in inherent molecular structure, especially in polymeric and biological materials. Unlike conventional techniques, we demonstrate a novel dynamic mechanical characterization method to study the effect of this structural evolution with strain on elastic properties. During tensile characterization of small diameter fibers, we quantitatively measured the viscoelastic properties as a continuous function of strain. While this approach is useful to characterize the elastic properties of metal microwires independent of applied strain, it is extremely important for fundamental understanding of molecular changes and their effect on the viscoelastic properties in materials such as polymer fiber and spider silk.The mechanical behavior at nano/microscale has been a subject of considerable interest in both the physical and biological sciences. The interest has been sparked by continued progress in the miniaturization of components for microelectronic applications, [1,2] synthesis of nanostructured materials for biomedical scaffolds, [3,4] as well as the recognition that many biological tissues and fibers exhibit superlative mechanical performance. [5][6][7] A good example is the sustained effort in characterizing, synthesizing, and understanding the behavior of spider silks, many of which are stronger than steel and exhibits higher toughness than Kevlar. [8,9] Fabrication of nano-and microfibers with similar properties has also showed promise in biomedical and composite applications.Mechanical characterization of materials at nano/microscale presents significant challenges due to the small forces and extensions that must be applied and measured. Some of the challenges have been addressed with recent advances in depthsensing nanoindentation technique, and in situ deformation studies inside an electron microscope. Quasi-static tensile mechanical properties of fibers with less than a few 10's of μm in diameter have also been reported in literature. [10][11][12] However, the challenge is slightly different for soft and ductile materials in the form of small diameter fibers-below 100 µm-which require extremely small forces but can sustain large amounts of strain. In addition, polymeric and biological fibers often exhibit strain-dependent or time-dependent properties, leading to difficulties in interpreting their mechanical properties by conventional techniques. Unlike metals and ceramics, mechanical deformation in polymeric materials involves evolution of the molecular network. [13] The fundamental changes in the molecular structure have been observed through in situ x-ray diffraction and other spectroscopic methods. [14][15][16] However, very little quantitative information is available on how the evolution of the structure of polymer chains affects the mechanical properties of the material. Herein, we describe a novel nanomechanical tensile testing methodology, called continuous dynamic analysis (CDA) that not only provides accurate measures of quasi-static properties, but also determines the d...

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