Interdiffusion in β-Ti-Zr binary alloys

The aim of this study is the determination of the interdiffusion characteristics in the beta-solid solution of Ti-Zr alloys (from 830 to 1730 degrees C). The interdiffusion coefficients in this binary system are calculated by the den Broeder method. The interdiffusion coefficients are weakly dependent on the composition: their values lie between approximately 10(-9) and 10(-7) cm(2)/s. The Hall method is used to determine the diffusion coefficients at the Ti-rich and Zr-rich sides. These coefficients are compared with the impurity diffusion coefficients in the pure metals from the literature, and with coefficients calculated by the Vignes and Birchenhall relation. Whereas the impurity diffusion coefficients in Ti and Zr show the anomalous diffusion already observed in many body-centered-cubic metals and alloys, this behaviouris not observed for the interdiffusion in the Ti-Zr alloys. These results are compared with the results obtained in the binary systems Ti-Hf and Zr-Hf. (C) 2008 Elsevier B.V. All rights reserved.