The generalized Lindemann melting hypothesis has recently been used to develop a unified thermodynamic criterion for melting applicable to both heat-induced melting and disorder-induced crystalline-to-amorphous (c-a) transformation. The hypothesis stipulates that the sum $〈{\ensuremath{\mu}}^{2}{〉}_{\mathrm{Total}}$ of the static and dynamic root-mean-square (rms) atomic displacements is a constant fraction of the nearest-neighbor distance along the melting curve of a solid. To test this hypothesis, energy-filtered selected area electron-diffraction intensity measurements were used to determine the generalized Lindemann parameter $\ensuremath{\delta}=\sqrt{〈{\ensuremath{\mu}}^{2}{〉}_{\mathrm{Total}}}{/d}_{\mathrm{nn}},$ in which ${d}_{\mathrm{nn}}$ represents the nearest-neighbor distance, as a function of boron concentration during implantation of $50\ensuremath{-}{\mathrm{keV}\mathrm{}\mathrm{B}}^{+}$ into polycrystalline Ni at 77 K. The onset of amorphization was found to occur close to 10 at. % boron, which is in good agreement with the value predicted by ${T}_{o}$ curve calculated using the generalized Lindemann hypothesis. Moreover, the critical value of the generalized Lindemann parameter for amorphization, ${\ensuremath{\delta}}_{\mathrm{Critical}}=0.115\ifmmode\pm\else\textpm\fi{}0.01,$ is within experimental error, identical to that for Ni just below its thermodynamic melting temperature of $T=1728\mathrm{K},$ hence providing a direct confirmation for the generalized Lindemann melting hypothesis.