Effect of Ternary Addition on Characteristics of Pb-Sn Base Alloys

A study of the microaddition dependence of the structural, mechanical
and electrical characteristics of lead-5wt.% Sn alloy prepared by melt spinning
and/or the conventional method was carried out using X-ray diffraction,
dynamic resonance technique, hardness and resistivity measurements. The
conventional method produced more crystalline structure than that of the melt
spun. The thermal diffusivity, hardness and resistivity values were found to be
higher for PbSn samples prepared by the conventional method than those of the
melt spun PbSn samples, while the value of the internal friction was higher for
the melt-spun alloy samples. This may be due to the creation of defects by the
rolling process used during the preparation of the cold rolled sheets. The
dynamic Young’s modulus was nearly of the same order for both the rapidly
solidified and the cold rolled alloys. The results were explained in terms of the
dislocation theory, the effect of quenching rate on the produced density
fluctuations in composition and the modes of interaction of crystal lattice
defects.