A First Principle Study of the Effect of Nb on the Oxidation Behavior of NiTi Alloy

Abstract:

Article Preview

A first principle study was performed to discuss the high temperature oxidation mechanism of NiTi alloys with the special emphasis on the effect of Nb on the oxidation behavior. The calculation results suggest that the Nb atom prefers the Ti site in Ni(Ti,Nb). The addition of Nb will not only reduces the electron density of Ti-d and Ni-d states near the Fermi energy level but the their electron contributions to the p-orbital of Ti. In addition, the Nb atom increases the formation energy of the Ti defect, which will decrease the diffusion of Ti atoms. All these Nb-induced effects account for the improvement of high temperature oxidation resistance, which agrees well with the experimental results.

Info:

Periodical:

Materials Science Forum (Volumes 546-549)

Edited by:

Yafang Han et al.

Pages:

1471-1476

DOI:

10.4028/www.scientific.net/MSF.546-549.1471

Citation:

H. L. Wu et al., "A First Principle Study of the Effect of Nb on the Oxidation Behavior of NiTi Alloy", Materials Science Forum, Vols. 546-549, pp. 1471-1476, 2007

Online since:

May 2007

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.