Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (5): 629-673.DOI: 10.1007/s40195-018-0789-2
• Orginal Article • Previous Articles Next Articles
Shuang Li1, Xiao-Wu Hu1(), Wei-Guo Zhang2, Yu-Long Li1, Xiong-Xin Jiang1
Received:
2018-04-27
Revised:
2018-06-06
Online:
2019-05-10
Published:
2019-05-27
Shuang Li, Xiao-Wu Hu, Wei-Guo Zhang, Yu-Long Li, Xiong-Xin Jiang. Comparative Study on Solid-State and Metastable Liquid-State Aging for SAC305/Cu Joints[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(5): 629-673.
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Fig. 1 Time-temperature curves a-c and exothermic curves a1-c1 of SAC305/Cu-soldered samples under conditions of reflowing a, a1, solid-state aging at 209 °C for 60 min b, b1 and metastable supercooled liquid-state aging at 209 °C for 60 min c, c1
Fig. 2 Cross-sectional microstructures of SAC305/Cu solder joints after dip soldering for 3 s a, solid state aged for 30 min b and metastable supercooled liquid aged for 30 min c and EDS analysis of spectrums 1 d and 2 e from Fig. 1c
Fig. 3 Cross-sectional microstructures of SAC305/Cu solder joints under solid-state aging a-c and metastable supercooled liquid aging d-f for 60 min a, d, 120 min b, e, 180 min c, f
Fig. 6 Morphologies of SAC305/Cu interfacial compound grains aged at 209 °C under conditions of solid-state aging a, c, e, g and metastable supercooled liquid aging b, d, f, h for 30 min a, b, 60 min c, d, 120 min e, f, 180 min g, h
Aging time (min) | Solid-state aging | Metastable supercooled liquid aging |
---|---|---|
30 | 3.17 | 6.25 |
60 | 3.84 | 9.53 |
120 | 4.41 | 11.27 |
180 | 4.87 | 12.23 |
Table 1 IMC thickness (μm) with increasing aging time under various aging state
Aging time (min) | Solid-state aging | Metastable supercooled liquid aging |
---|---|---|
30 | 3.17 | 6.25 |
60 | 3.84 | 9.53 |
120 | 4.41 | 11.27 |
180 | 4.87 | 12.23 |
Aging time (min) | Solid-state aging | Metastable supercooled liquid aging |
---|---|---|
30 | 3.87 | 10.69 |
60 | 4.84 | 13.60 |
120 | 5.25 | 16.28 |
180 | 5.88 | 21.08 |
Table 2 Average grain diameter (μm) with increasing aging time under various aging state
Aging time (min) | Solid-state aging | Metastable supercooled liquid aging |
---|---|---|
30 | 3.87 | 10.69 |
60 | 4.84 | 13.60 |
120 | 5.25 | 16.28 |
180 | 5.88 | 21.08 |
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