ABSTRACT

Sn-Bi is an industrially important system that is often incorporated into multicomponent solder alloys. Despite a large body of experimental work, the reported data are in significant disagreement over the betaSn solidus line and maximum solubility of Bi in betaSn. These inconsistencies are often adopted in thermodynamic assessments and databases and might result in the incorrect design of Bi-containing solders. The present study re-measures the betaSn solidus line using DSC techniques, explores the origin of the inconsistencies in past measurements, and provides recommended values. The work highlights the importance of the equilibration methods used for solidus measurements and discusses methods to test for full homogenisation.

Compounds

#	Formula	Name
1	Bi	bismuth
2	Sn	tin

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	2	Normal melting temperature, K ; Crystal			Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	1 2	Eutectic temperature, K ; Crystal - 1			Crystal - 1 Crystal Liquid Air at 1 atmosphere	DTA	1
POMD	1 2	Solid-liquid equilibrium temperature, K ; Liquid	Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Crystal	DTA	11
POMD	1 2	Solid-liquid equilibrium temperature, K ; Crystal	Mass fraction - 1; Crystal	Pressure, kPa; Crystal	Crystal Liquid	DTA	7

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Recommended values for the betaSn solidus line in Sn-Bi alloys

Belyakov, S. A., Gourlay, C. M.

ABSTRACT