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Thermodynamic characteristics, microstructure and mechanical properties of Sn-0.7Cu-xIn lead-free solder alloy.
- Source :
-
Journal of Alloys & Compounds . Apr2018, Vol. 742, p835-843. 9p. - Publication Year :
- 2018
-
Abstract
- The microstructure and mechanical properties of Sn-0.7Cu solder alloy and Sn-0.7Cu with 1.0–5.0 wt% indium addition were investigated in this study. With indium added into Sn-0.7Cu solder, the melting temperature decreased and the reaction temperature increased. Coarse grains of Cu 6 (Sn,In) 5 intermetallic compounds (IMCs) were formed in the alloy matrix when the indium content increased to 1.0 wt%. Indium was evenly distributed in the β-Sn phase and Cu 6 (Sn,In) 5 IMCs in as-prepared In-containing solder alloys. After isothermal aging, indium accumulated gradually in the Cu 6 (Sn,In) 5 IMCs while decreasing its content in the β-Sn phase. Tensile test results indicated that the ultimate tensile strength increased obviously and that the elongation decreased significantly with indium addition. Sawtooths were observed in the stress-strain curves of all aged In-containing alloys. A model describing a coherent relationship between the β-Sn phase and the Cu 6 (Sn,In) 5 phase was proposed to explain this phenomenon. The fracture surface of the Sn-0.7Cu alloy exhibited a ductile fracture mode while a mixed ductile-brittle fracture mode occurred when excessive indium was added into Sn-0.7Cu alloys. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MICROSTRUCTURE
*TIN alloys
*INDIUM
*MELTING
*TENSILE tests
Subjects
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 742
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 128126304
- Full Text :
- https://doi.org/10.1016/j.jallcom.2018.01.386