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Effect of Bi addition on the shear strength and failure mechanism of low-Ag lead-free solder joints
Chen, Yinbo1,2; Meng, Zhi-Chao1,2; Gao, Li-Yin3; Liu, Zhi-Quan1,3
Corresponding AuthorLiu, Zhi-Quan(zqliu@siat.ac.cn)
2021
Source PublicationJOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
ISSN0957-4522
Pages15
AbstractTo optimize the mechanical properties of low-Ag lead-free solder, different amount of Bi element was added into the Sn-1.0Ag-0.5Cu (SAC105) to form SAC105-xBi (0 <= x <= 4) solder alloy. The microstructural evolution and shear fracture of SAC105-xBi solder joints were systematically investigated to clarify the failure mechanism after reflow and after 175 degrees C aging compared to SAC305. It was found that Bi element could provide solution strengthening and second-phase strengthening in the low-Ag SAC solder joints depending on the amount of added Bi element. The shear strength after reflow increased from 34.79 to 70.16 MPa with the increase of Bi addition from x = 0.0 to x = 4.0, while that after aging at 175 degrees C for 168 h increased from 28.97 MPa (x = 0.0) to 55.02 MPa (x = 4.0). The thickness of IMC decreased with the addition of Bi, and excessive Bi would precipitate in the matrix when the Bi content reached 2 wt% or even form brittle Bi barrier layer after 4 wt% addition. During shear tests, three kinds of fracture mode including ductile fracture, quasi-cleavage fracture, and cleavage brittle fracture were observed, and three kinds of failure position including solder matrix, Cu6Sn5/solder interface, and Cu3Sn/Cu interface were revealed. The failure mechanism of different solder joints was closely related to the coupling effects among the Bi amount in the matrix, the thicknesses of IMC, and the status of Kirkendall voids, which significantly affected the reliability of SAC solder joints. Finally, SAC105-1.0Bi solder alloy was considered having the most suitable Bi addition with anticipated comprehensive properties compared with SAC305.
Funding OrganizationNational Key R&D Program of China
DOI10.1007/s10854-020-04982-4
Indexed BySCI
Language英语
Funding ProjectNational Key R&D Program of China[2017YFB0305700]
WOS Research AreaEngineering ; Materials Science ; Physics
WOS SubjectEngineering, Electrical & Electronic ; Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000604092100027
PublisherSPRINGER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/158937
Collection中国科学院金属研究所
Corresponding AuthorLiu, Zhi-Quan
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Chinese Acad Sci, Shenzhen Inst Adv Elect Mat, Shenzhen Inst Adv Technol, Shenzhen 518055, Peoples R China
Recommended Citation
GB/T 7714
Chen, Yinbo,Meng, Zhi-Chao,Gao, Li-Yin,et al. Effect of Bi addition on the shear strength and failure mechanism of low-Ag lead-free solder joints[J]. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS,2021:15.
APA Chen, Yinbo,Meng, Zhi-Chao,Gao, Li-Yin,&Liu, Zhi-Quan.(2021).Effect of Bi addition on the shear strength and failure mechanism of low-Ag lead-free solder joints.JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS,15.
MLA Chen, Yinbo,et al."Effect of Bi addition on the shear strength and failure mechanism of low-Ag lead-free solder joints".JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS (2021):15.
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