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:
Microstructures of alkali- and/or heat-treated films on a Ti-15Zr-4Nb-4Ta alloy wereanalyzed by means of scanning electron microscopy, thin film X-ray diffraction and Auger electronspectroscopy. The cohesiveness of films was also evaluated by scratch tests. The films were formedby immersion in 5M aqueous NaOH solution at 60 °C for 86.4 ks (alkali treatment) followed byheating at 400–600 ºC for 3.6 ks. The film on alloy formed by alkali treatment exhibits the samestrucutre as that formed on an alkali-treated titanium. Compositional gradient of alloying elements, Zr,Nb and Ta, is detected in the film. The cohesion of alkali-treated film is considerably increased by theheat treatment, and the maximum cohesion is obtained by heating at 600 ºC. The increase in cohesionof alkali-treated film by heat treatment is due to both the diffusion of Zr into film and the formation ofsodium titanate on substrate
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3706.pdf
