Abstract
The effect of thickening of intermetallic compound layers formed at the interface and shear properties of solder joints are studied as a function of aging for lead-free solders. The modified double lap shear test method is employed to measure the shear strength and shear strain. The test specimens are Sn-3.5Ag and Sn-3.5Ag-1Zn solders and they were aged up to 2880 h at 423 K.
Intermetallic compound layers at the interface between Sn-3.5Ag solders and Cu substrate grow with increasing aging time. The coarsened Cu6Sn5 intermetallic compounds lead to a deterioration of the shear properties of solder joints by changing the crack propagation path and decreasing shear strength of the solder joint. Adding 1 wt% of Zn to Sn-3.5Ag, however, suppresses Cu6Sn5 intermetallic compound growth markedly by forming a Cu–Zn–Sn layer. This Cu–Zn–Sn layer acts as a diffusion barrier between Cu6Sn5 and Sn-3.5Ag-1Zn solders during the aging treatments. Thus, Sn-3.5Ag-1Zn solders have higher shear strength and higher strain to fracture than those of Sn-3.5Ag/Cu solder joints.
References
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© 2005 Carl Hanser Verlag, München
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Articles Basic
- Solute drag illustrated graphically
- Dopant effect on high-temperature plastic flow behavior and grain boundary chemistry in oxide ceramics
- Anomalous behaviour in diffusion impedance of intercalation electrodes
- A simple model of fully-faceted grain growth and coarsening with non-linear growth laws
- Thermal conductivity of functionally graded Fe–Cu–C alloy processed by liquid phase sintering and carburization
- Microstructure development during liquid-phase sintering
- The mechanical properties of a joint of Sn-3.5Ag-1Zn solder and Cu substrate with aging treatment
- Three-dimensional morphological characterization of coarsened microstructures
- Faceting and migration of twin grain boundaries in zinc
- Effect of external electric field on the microstructural evolution of La2O3-doped BaTiO3 ceramics
- Hardness and fracture toughness of ultra-fine WC-10Co-X cemented carbides prepared from nanocrystalline powders
- Systematic study of grain boundary atomistic structures and related properties in cubic zirconia bicrystals
- Spontaneous generation of charged atoms or clusters during thermal evaporation of silver
- The influence of singular surfaces and morphological changes on coarsening
- Electrical activity of grain boundaries in polycrystalline silicon – influences of grain boundary structure, chemistry and temperature
- Changes in the distribution of interfaces in PMN-35 mol% PT as a function of time
- Study of the effect of heat treatment on a Pt–Co thin film by Monte Carlo simulations coupled with a modified embedded atom method
- The influence of misorientation deviation on the faceting of Σ3 grain boundaries in aluminium
- Notifications/Mitteilungen
- Personal/Personelles
- Materials Week
- Conferences/ Konferenzen
Artikel in diesem Heft
- Frontmatter
- Editorial
- Editorial
- Articles Basic
- Solute drag illustrated graphically
- Dopant effect on high-temperature plastic flow behavior and grain boundary chemistry in oxide ceramics
- Anomalous behaviour in diffusion impedance of intercalation electrodes
- A simple model of fully-faceted grain growth and coarsening with non-linear growth laws
- Thermal conductivity of functionally graded Fe–Cu–C alloy processed by liquid phase sintering and carburization
- Microstructure development during liquid-phase sintering
- The mechanical properties of a joint of Sn-3.5Ag-1Zn solder and Cu substrate with aging treatment
- Three-dimensional morphological characterization of coarsened microstructures
- Faceting and migration of twin grain boundaries in zinc
- Effect of external electric field on the microstructural evolution of La2O3-doped BaTiO3 ceramics
- Hardness and fracture toughness of ultra-fine WC-10Co-X cemented carbides prepared from nanocrystalline powders
- Systematic study of grain boundary atomistic structures and related properties in cubic zirconia bicrystals
- Spontaneous generation of charged atoms or clusters during thermal evaporation of silver
- The influence of singular surfaces and morphological changes on coarsening
- Electrical activity of grain boundaries in polycrystalline silicon – influences of grain boundary structure, chemistry and temperature
- Changes in the distribution of interfaces in PMN-35 mol% PT as a function of time
- Study of the effect of heat treatment on a Pt–Co thin film by Monte Carlo simulations coupled with a modified embedded atom method
- The influence of misorientation deviation on the faceting of Σ3 grain boundaries in aluminium
- Notifications/Mitteilungen
- Personal/Personelles
- Materials Week
- Conferences/ Konferenzen