Evaluation of Microstructures and Mechanical Properties of Sn-10Sb-Ni Lead-Free Solder Alloys with Small Amount of Ni Using Miniature Size Specimens
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructure Observation
3.2. Tensile Properties and Fracture Modes
3.3. Fatigue Properties and Microstructural Change
4. Conclusions
- (1)
- The Sn-10Sb-Ni solder alloys with 0.05–0.50 mass% Ni have the microstructure in which Sb-Sn and Ni-Sb compounds are dispersed in β-Sn matrix. When Sb and Ni content in the Sn-Sb-Ni increases, the Sb-Sn and Ni-Sb compounds are coarsened, respectively.
- (2)
- The effects of the Ni content on tensile properties of the Sn-10Sb-Ni solder alloys is slight at 25 °C. This is because the tensile properties are largely influenced by the dispersion of the coarsened SbSn compounds. At 150 °C and 200 °C, the 0.1% proof stress and the tensile strength increase gradually with the Ni content increase, and saturate at the Ni amount over 0.25 mass%. This is because the coarsened Sb-Sn compounds decompose and Ni-Sb compounds have a large effect on the tensile properties.
- (3)
- The absolute values of the fatigue ductility exponents α of the Sn-10Sb-Ni solder alloys are smaller than that of the Sn-10Sb except for Sn-10Sb-0.05Ni at 25 °C. At 150 °C and 200 °C, the absolute values of α of all of the Sn-10Sb-Ni increase except for the Sn-10Sb-0.05Ni. In particular, the absolute values of α of the Sn-10Sb-Ni solder alloys are smaller than that of the Sn-10Sb except for Sn-10Sb-0.05Ni at 25 °C. The absolute values of α of the Sn-10Sb-0.50Ni are larger than any other solder alloys. Compared with the Sn-10Sb and Sn-10Sb-Ni, the fatigue properties of Sn-10Sb-Ni solder alloys with 0.10–0.25 mass% Ni are better than that of Sn-10Sb at 200 °C.
- (4)
- In the Sn-10Sb-0.50Ni solder alloy, dispersed fine Ni-Sb compounds have the dislocation pinning effect and suppress local recrystallization process at 25 °C. However, at high temperature, the dislocation pinning effect decreases due to the formation of coarsened Ni-Sb compounds. Consequently, the fatigue life decreased because the crack propagates easily to the fine β-Sn grain boundaries formed by local recrystallization process.
Author Contributions
Funding
Conflicts of Interest
References
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Temperature (°C) | Strain Rate (s−1) |
---|---|
25, 150, 200 | 2.0 × 10−1 |
Temperature (°C) | Strain Rate (s−1) | Total Strain Range (%) |
---|---|---|
25, 150, 200 | 2.0 × 10−3 | 0.4–2.0 |
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Kobayashi, T.; Shohji, I. Evaluation of Microstructures and Mechanical Properties of Sn-10Sb-Ni Lead-Free Solder Alloys with Small Amount of Ni Using Miniature Size Specimens. Metals 2019, 9, 1348. https://doi.org/10.3390/met9121348
Kobayashi T, Shohji I. Evaluation of Microstructures and Mechanical Properties of Sn-10Sb-Ni Lead-Free Solder Alloys with Small Amount of Ni Using Miniature Size Specimens. Metals. 2019; 9(12):1348. https://doi.org/10.3390/met9121348
Chicago/Turabian StyleKobayashi, Tatsuya, and Ikuo Shohji. 2019. "Evaluation of Microstructures and Mechanical Properties of Sn-10Sb-Ni Lead-Free Solder Alloys with Small Amount of Ni Using Miniature Size Specimens" Metals 9, no. 12: 1348. https://doi.org/10.3390/met9121348