电-力耦合作用下cusn-3.0ag-0.5cucu微焊点的拉伸力学性能和断裂行为 mechanical performance and fracture behavior of microscale cusn-3.0ag-0.5cucu joints under electro-tensile coupled loads.pdfVIP
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电-力耦合作用下cusn-3.0ag-0.5cucu微焊点的拉伸力学性能和断裂行为 mechanical performance and fracture behavior of microscale cusn-3.0ag-0.5cucu joints under electro-tensile coupled loads
第 52 卷第 10 期 机 械 工 程 学 报 Vol.52 No.10
2 0 1 6 年 5 月 JOURNAL OF MECHANICAL ENGINEERING May 2 0 1 6
DOI :10.3901/JME.2016.10.046
电-力耦合作用下Cu/Sn-3.0Ag-0.5Cu/Cu
微焊点的拉伸力学性能和断裂行为*
1 1, 2 1 1
李望云 秦红波 周敏波 张新平
(1. 华南理工大学材料科学与工程学院 广州 510640 ;
2. 桂林电子科技大学机电工程学院 桂林 541004)
摘要:对比研究三明治结构线形 Cu/Sn-3.0Ag-0.5Cu/Cu 微焊点在拉伸、电-拉伸和电迁移后电-拉伸三种加载模式下的力学行
为和断裂特性,并基于电流引发的焦耳热效应和电迁移效应,从电流对原子和空位扩散、空位浓度及位错滑移与攀移的影响
等方面,探讨电-力耦合载荷对焊点拉伸断裂行为的影响。结果表明,焊点在电-拉伸时应力-应变曲线呈现快速变形、线性变
形和加速断裂三阶段,其中快速变形阶段是以焦耳热引起的热弹性变形为主,而拉伸和电迁移后电-拉伸时应力-应变曲线只
存在线性变形和加速断裂阶段;电迁移后电-拉伸时焊点断裂强度和断裂应变最小而等效模量最大,拉伸加载时焊点断裂强
度和断裂应变最大而等效模量最小;电-拉伸时 β-Sn 相趋于沿电、力加载方向排列;三种加载模式下焊点断裂均发生在钎料
体内,呈韧性断裂。
关键词:电-拉伸;微焊点;Sn-3.0Ag-0.5Cu 钎料;断裂
中图分类号:TG115
Mechanical Performance and Fracture Behavior of Microscale
Cu/Sn-3.0Ag-0.5Cu/Cu Joints under Electro-tensile Coupled Loads
1 1, 2 1 1
LI Wangyun QIN Hongbo ZHOU Minbo ZHANG Xinping
(1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640;
2. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004)
Abstract :Mechanical performance and fracture behavior of microscale line-type Cu/Sn-3.0Ag-0.5Cu/Cu joints under electro-tensile
coupled loads are investigated, comparing with those in tests under tensile load and under electro-tensile coupled loads follo
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