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The dynamic and static mechanical characteristics of Sn-7Zn-based solder alloy modified with microalloying of In, Fe and Co elements.
- Source :
- Journal of Materials Science: Materials in Electronics; Dec2022, Vol. 33 Issue 36, p26728-26743, 16p
- Publication Year :
- 2022
-
Abstract
- Tensile creep experiments and pulse-echo overlap (PEO) method were utilized to analyze the impact of small additions of 2.5%wt In, Fe and Co (0.1%wt for each) on the creep resistance and elastic properties of a cast Sn-7Zn alloy. The In-modified alloy displays noticeably enhanced creep resistance and increased the fracture time (~ 2.7 times) due to precipitation strengthening and formation of γ-InSn<subscript>4</subscript> particles. The In-modified alloy exhibits an as-solidified grain structure, which is finer than the Sn-7Zn alloy, and predicted to enhance deformation resistance by lattice self-diffusion creep. Nonetheless, the creep resistance of Sn-7Zn alloy deteriorates after Fe and Co addition, highlighting the excellent coarsening of the new γ-Zn<subscript>21</subscript>Co<subscript>5</subscript>, γ-Co<subscript>2</subscript>Sn<subscript>2</subscript>Zn, and α-Fe<subscript>0.92</subscript>Sn<subscript>0.08</subscript> precipitates. The obtained results implied that the creep strain rate follows the Garofalo hyperbolic sine equation, and the computed creep stress exponent is consistent with a climb-controlled dislocation creep. Consequently, for all PEO tests, the values of resulting Young's modulus (E) (66.7 GPa) and shear modulus (G) (20.5 GPa) of In-modified Sn-7Zn alloy were superior to those of the conventional plain Sn-7Zn alloy and Fe and Co modified alloy in its cast condition. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09574522
- Volume :
- 33
- Issue :
- 36
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science: Materials in Electronics
- Publication Type :
- Academic Journal
- Accession number :
- 160821900
- Full Text :
- https://doi.org/10.1007/s10854-022-09340-0