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Theoretical and experimental investigations on mechanical properties of (Fe,Ni)Sn2 intermetallic compounds formed in SnAgCu/Fe-Ni solder joints
Gao, Li-Yin1; Luo, Yi-Xiu2; Wan, Peng3; Liu, Zhi-Quan1,2
Corresponding AuthorLiu, Zhi-Quan(zqliu@siat.ac.cn)
2021-08-01
Source PublicationMATERIALS CHARACTERIZATION
ISSN1044-5803
Volume178Pages:8
AbstractThe effect of Ni element on mechanical properties of FeSn2 phase was investigated by means of nano-indentation measurements and first-principles calculations. The Ni content within (Fe,Ni)Sn2 interfacial intermetallic compounds (IMCs) were controlled by using different Fe-Ni under bump metallizations (UBMs) within SnAgCu (SAC)/Fe-Ni solder joints. For SAC/Fe-45Ni (45 wt% Ni) solder joint, (Fe,Ni)Sn2 phase has coarser grains with an average amount of 1.5 at.% Ni as confirmed by scanning electron microscopy (SEM) observation and energy disperse spectroscopy (EDS). Its average Young's modulus and hardness are 134.1 GPa and 6.0 GPa respectively as measured by nano-indentation test. While for SAC/Fe-73Ni solder joints, (Fe,Ni)Sn2 phase has smaller grain size with 4.2 at.% Ni solid solution. The corresponding Young's modulus and hardness are 143.2 GPa and 6.1 GPa respectively. As further confirmed by transmission electron microscopy (TEM) and selected area electron diffraction (SAED), the (Fe,Ni)Sn2 phase possesses a crystalline of I4/mcm space group. The mechanical properties of pure FeSn2, Fe23NiSn48(about 1.5 at. % Ni) and Fe7NiSn16(about 4.2 at. % Ni) are also calculated using first principle calculation. The calculated results showed that Young's modulus increased from 134.8GPa to 139.9GPa as the Ni concentrations increased from 0 at.% to 4.2 at.%. Combining theoretical and experimental methods, we can safely conclude that the introduction of Ni element improves the Young's modulus of FeSn2 phase. However, ductility of FeSn2-based phase was the worst among the common IMCs deducing from the B/G value. And the brittleness was also confirmed by the fracture surface according to SEM observation. The brittleness of (Fe,Ni)Sn2 phase might be a risk of the reliability of SAC/Fe-Ni solder joints.
KeywordSolder joint Intermetallic compound Mechanical property Nano-indentation First principle calculation
Funding OrganizationGuangdong Basic and Applied Basic Research Fund
DOI10.1016/j.matchar.2021.111195
Indexed BySCI
Language英语
Funding ProjectGuangdong Basic and Applied Basic Research Fund[2019A1515110771] ; Guangdong Basic and Applied Basic Research Fund[2019A1515110469]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS IDWOS:000678053400004
PublisherELSEVIER SCIENCE INC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/159688
Collection中国科学院金属研究所
Corresponding AuthorLiu, Zhi-Quan
Affiliation1.Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen Inst Adv Elect Mat, Shenzhen 518055, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
3.Foshan Shunde Midea Elect Heating Appliances Mfg, Foshan 528311, Peoples R China
Recommended Citation
GB/T 7714
Gao, Li-Yin,Luo, Yi-Xiu,Wan, Peng,et al. Theoretical and experimental investigations on mechanical properties of (Fe,Ni)Sn2 intermetallic compounds formed in SnAgCu/Fe-Ni solder joints[J]. MATERIALS CHARACTERIZATION,2021,178:8.
APA Gao, Li-Yin,Luo, Yi-Xiu,Wan, Peng,&Liu, Zhi-Quan.(2021).Theoretical and experimental investigations on mechanical properties of (Fe,Ni)Sn2 intermetallic compounds formed in SnAgCu/Fe-Ni solder joints.MATERIALS CHARACTERIZATION,178,8.
MLA Gao, Li-Yin,et al."Theoretical and experimental investigations on mechanical properties of (Fe,Ni)Sn2 intermetallic compounds formed in SnAgCu/Fe-Ni solder joints".MATERIALS CHARACTERIZATION 178(2021):8.
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