Formation of VSi2/SiC composites by mechanical alloying and thermal treatment starting from elemental powders has been investigated by X-ray diffraction, transmission electron microscopy, and differential thermal analysis. It was found that the formation of SiC follows the same reaction sequences during both mechanical alloying and thermal activation, i.e., VC is initially formed, then SiC is formed through the replacement reaction between VC and Si. However, VSi2formation chooses a different pathway in either mechanical or thermal processes, namely, VSi2is directly formed during mechanical alloying, while in the annealing process an intermediate phase V5Si3is formed first, and further reaction between V5Si3and residual Si results in the formation of the final VSi2phase. The presence of oxygen in starting vanadium powder probably accounts for the different pathways in phase formation. © 1996 Plenum Publishing Corporation.
|Pages (from-to)||73 - 78|
|Number of pages||6|
|Journal||Journal of Materials Synthesis and Processing|
|Publication status||Published - Mar 1996|
All Science Journal Classification (ASJC) codes
- Materials Science(all)