Anisotropic mechanical parameters of eutectic composite Sn-Pb-Cd specimens grown at variable growth rate follow the Weibull probability distribution curve, since the microstructural parameters structuring the specimens by variable anisotropic growth are found obeying the Weibull distribution. Evidentially, the curve exhibits two cut -off points corresponding to a lower strength limit in the slow and fast growth regions and an upper strength limit in the moderate growth region. Investigative evidences indicate the linear variation of the mechanical parameters in the slow and fast growth regions and their nonlinear nature in the moderate growth region over the entire experimental growth range. The latter is equivalent to the theoretical strength of the composite, since the microstructural parameters in the moderate growth region express their proximity obedience to the Guass distribution. Of greater interest is the moderate anisotropic growth velocity (~2.98x10-7 m3s-1) that strengthens the composite specimen three- to four-fold of its isotropic growth affined in an ice bath (~273K) and manifold superior to its constituent phases irrespective of the growth mode. Vickers microhardness of composite specimens encompassing the experimental growth range also offers supporting evidence to the essence of the Weibull distribution curve. Mechanical parameters accomplishing microhardness data are comprehensively extracted, that signify the occurrence of plastic deformation. Growth habits and thermal stability of eutectic composite phases are ascertained using SEM and DSC. X-ray diffraction studies affirm eutectic composite to be a terminal solidus solution of physically distinct and mechanically separable phases.
