Relationship between microstructure homogeneity and bonding stability of ultrafine gold wire |
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Authors: | Seoung-Bum Son Hyunchul Roh Suk Hoon Kang Hee-Suk Chung Do Hyun Kim Yong Seok Choi Jong Soo Cho Jeong-Tak Moon and Kyu Hwan Oh |
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Affiliation: | (1) Department of Materials Science and Engineering, Seoul National University, Seoul, 151-742, South Korea;(2) Nuclear Materials Research Division, Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu, Daejeon, 305-353, South Korea;(3) Fundamental Technology Group, Central R&D Institute, Samsung Electro-Mechanics, Suwon, 443-743, South Korea;(4) MK electron, 316-2 Geumeo-ri, Pogok-myeon, Yongin-si, Gyeong gi-do, 449-810, South Korea; |
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Abstract: | Inhomogeneous microtexture evolution during the cold drawing process usually results in lean, sway, or sweep failure. The
<111> longitudinal fiber texture has higher stiffness than the <100> texture and its proportion and distribution in the cross-section
are critical for the bonding stability of fine gold wire. We investigated the inhomogeneous microtexture evolution of gold
wire that was cold drawn through an asymmetric diamond die. In this study, the distributions of the <111> and <100> textures
in a 20 μm diameter fine gold wire are the variables and their effects on the bonding stability of the wire were estimated
by electron backscattered diffraction (EBSD) and finite element method (FEM) simulations. The use of a focused ion beam apparatus
enabled a high quality of band contrast of the EBSD to be achieved in the exact half cross-sectional area of the fine gold
wire. The detailed three-dimensional FEM results show that the asymmetric distribution of the textures plays a crucial role
in increasing the spatial displacement of the gold bonding wire. |
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