Microstructure of Rapidly Solidified Co-Sn-Ti and Co-Sn-Si Alloys
In this study, rapidly solidified Co-Sn-Ti and Co-Sn-Si alloys were investigated as candidate cathodic materials for lithium-ion batteries. (Co0.5Sn0.5)1-xTix (x=0.1, 0.2, 0.3, 0.4) and (Co0.5Sn0.5)0.9Si0.1 alloys were produced by Ar arc-melting. These alloys were further rapidly solidified into ribbons by the single-roll melt-spinning method. Constituent phases in the ribbons were identified by XRD, indicating that all of the alloys were composed of crystalline multi-phases with no amorphous phase. The microstructure of the ribbons was observed by SEM and TEM, and the chemical composition of constituent phases was analyzed by TEM-EDS. It is found from the SEM and TEM observations that the grain size of the constituent phases ranged from tens to hundreds nanometers due to the rapid solidification effect.
Young Won Chang, Nack J. Kim and Chong Soo Lee
S. Fujisawa et al., "Microstructure of Rapidly Solidified Co-Sn-Ti and Co-Sn-Si Alloys", Materials Science Forum, Vols. 561-565, pp. 1357-1360, 2007