Producing well aligned in situ composites in peritectic systems by directional solidification

Recently, it was found that cellular peritectic coupled growth (CPCG) can be a candidate method to grow well aligned in situ composites in peritectic alloys. In this letter, we experimentally show that there is a narrow growth region in which CPCG can be stable to avoid the influences of peritectic reaction around the trijunctions and the sidebranching instability to produce well aligned in situ composites. A simplified model was developed to predict the growth region of stable CPCG. Good agreement was obtained between the theoretical predictions and the experimental observations.