Influence of Isothermal Aging on Microstructure and Shear Fracture Behavior of Cu/Sn/Cu Micro-solder Joint

Liu Henglin; Wei Guoqiang; Li Dalei

doi:10.15980/j.tzzz.2017.03.019

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Influence of Isothermal Aging on Microstructure and Shear Fracture Behavior of Cu/Sn/Cu Micro-solder Joint
Vol. 37, Issue 3, Pages: 302-305(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.03.019

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[1]刘恒林,卫国强,李达磊.等温时效对小间隙Cu/Sn/Cu焊点组织及性能影响[J].特种铸造及有色合金,2017,37(03):302-305.

Liu Henglin, Wei Guoqiang, Li Dalei. Influence of Isothermal Aging on Microstructure and Shear Fracture Behavior of Cu/Sn/Cu Micro-solder Joint. [J]. Special Casting & Nonferrous Alloys 37(3):302-305(2017)
[1]刘恒林,卫国强,李达磊.等温时效对小间隙Cu/Sn/Cu焊点组织及性能影响[J].特种铸造及有色合金,2017,37(03):302-305. DOI： 10.15980/j.tzzz.2017.03.019.

Liu Henglin, Wei Guoqiang, Li Dalei. Influence of Isothermal Aging on Microstructure and Shear Fracture Behavior of Cu/Sn/Cu Micro-solder Joint. [J]. Special Casting & Nonferrous Alloys 37(3):302-305(2017) DOI： 10.15980/j.tzzz.2017.03.019.

摘要

研究了焊点高度为10μm的Cu/Sn/Cu微焊点接头在110℃下分别进行200、400、600、800h等温时效后界面CuSn金属间化合物的显微组织及剪切强度的演变。结果表明

随着时效时间延长

界面的金属间化合物由初始的扇贝状Cu-

组织逐渐演变为层状的Cu

Sn和Cu

组织

并且界面金属间化合物在时效作用下不断消耗钎缝中的β-Sn向焊点中部生长

800h时效后焊点组织完全被Cu

Sn和Cu

金属间化合物所取代;另外

随着时效时间的延长及界面金属间化合物的演变

焊点的剪切强度不断提高

其中当时效时间达到400h时

两端界面金属间化合物发生部分接合

剪切强度增幅较大;800h时效后试样的剪切强度为最大值。断口形貌分析表明

随着时效时间延长

焊点的断裂机制由韧性剪切断裂演变为脆性剪切断裂。

Abstract

A series of sandwich structure of Cu/Sn/Cu solder joints with the bump height of 10μm were prepared to understand the effects of the isothermal aging on the microstructure and shearing strength of the joints aged at 110 ℃ for 200

400

600

800 h

respectively

and microstructure evolution of the joints was characterized by SEM equipped with EDS.The results reveal that the scalloped-like Cu6Sn5 intermetallic compound（IMC）at soldering changed gradually into the combination layers of Cu3 Sn and Cu6Sn5 IMC with aging time increase

and the two layers of IMC grown thicker as a result of consumingβ-Sn in the soldering during aging process.In addition

with increasing in aging time and IMC evolution

shearing strength of the joint is increased gradually

and a part of the IMC from both sides is contacted with each other at the middle of the joints after aging for 400 h

and the shear strength came to maximum after aging for 800 h.The fracture mechanism is changed from ductile fracture to brittle fracture gradually.