ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A first principle study was performed to discuss the high temperature oxidation mechanismof NiTi alloys with the special emphasis on the effect of Nb on the oxidation behavior. Thecalculation results suggest that the Nb atom prefers the Ti site in Ni(Ti,Nb). The addition of Nb willnot only reduces the electron density of Ti-d and Ni-d states near the Fermi energy level but the theirelectron contributions to the p-orbital of Ti. In addition, the Nb atom increases the formation energyof the Ti defect, which will decrease the diffusion of Ti atoms. All these Nb-induced effects accountfor the improvement of high temperature oxidation resistance, which agrees well with theexperimental results
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1471.pdf
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