| Project/Area Number |
12650718
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
KANENO Yasuyuki Osaka Prefecture University, Graduate School of Engineer, Research Associate, 大学院・工学研究科, 助手 (50214482)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | bonding wire / gold wire / Young's modulus / anisotropy / wire drawing / texture / orientation distribution function / recrystallization / 引抜き加工 / 二重繊維組織 / 結晶方位分関数 |
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| Research Abstract |
Gold wires with fine diameter of 〜20μm are widely used for bonding semiconductor devices. Due to the decrease of IC chip size, the development of gold wires with increased mechanical properties such as tensile strength and elasticity is required. For gold single crystal, it is known that Young's modulus of a crystallographic <111> direction is almost three times as much as that of a crystallographic <100> direction. It is therefore expected that ~ polycrystalline gold wires with high elasticity are available by texture control (i.e., fabrication of <111> orientated wires). In the present study, texture evolution during wire drawing and annealing of fine gold bonding wire was investigated by means of the orientation distribution function (ODF). Cold drawing texture of high-purity gold (99.999 wt.%) consisted of strong <111> and weak <100> fiber components below 99% reduction in area. Above 99% reduction in area, recrystallization occurred during wire-drawing process, resulting in increased <100> component. Cold drawing texture of gold wires with trace alloying elements (99.95 wt.% purity) also consisted of strong <111> and weak <100> fiber components similar to high-purity (99.999 wt.%) gold wires. However, for gold wires added trace alloying elements, recrystallization did not occur above 99% reduction in area, and thereby the <111> textural component retained beyond 99% reduction in area. Consequently, it is found that trace alloying addition to high-purity gold wire is useful for suppression of recrystallization during wire-drawing process and results in highly <111> orientated gold wires.
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