TEM studies of low temperature cathode-plasma nitrided Ti6Al7Nb alloy
Authors:
- J. Morgiel,
- K. Szymkiewicz,
- Ł. Maj,
- M. Tarnowski,
- T. Wierzchoń
Abstract
The Ti6Al7Nb alloy has been elaborated as a substitute for Ti6Al4V alloy especially for applications leading to its direct contact with human body fluids as the former totally eliminates the carcinogenic vanadium present in the latter. The Ti6Al7Nb presents so much needed high specific strength, but its aluminum addition is also harmful and will have to be taken care of. Nitriding could improve wear resistance of these alloys and form a diffusion barrier at least at first stage of their use. However, knowledge of phase composition of near surface area of Ti6Al7Nb after such treatment is still limited. Therefore, these experiments were planned to describe the effect of the plasma nitriding of Ti6Al7Nb alloy performed at 680 °C and 740 °C for 6 h. The transmission electron microscopy observations revealed that the plasma nitriding of this alloy performed at both of specified temperatures allows to produce a zone consisting of only three layers i.e. δ-TiN, α″-Ti martensite and (α-Ti + Ti3Al) phases. The only difference between both treatments was that plasma nitriding at 740 °C caused a porosity of upper part of the δ-TiN layer, while the one formed at 680 °C was only slightly thinner, but fully dense. Penetration of the nitrogen into sub-surface areas during plasma nitriding of Ti6Al7Nb alloy pushes down both the aluminum and niobium deep into the substrate freeing the near surface β-Ti from alloying additions. It allows to transform the latter into α″-Ti martensite during cooling down. The last layer in the nitrided zone was found to be formed by a mixture of α-Ti and Ti3Al phases.
- Record ID
- CUT32d5ba59838c4012ac7bbcffefa07d40
- Publication categories
- ;
- Author
- Journal series
- Surface and Coatings Technology, ISSN 0257-8972
- Issue year
- 2019
- Vol
- 359
- Pages
- 183-189
- Other elements of collation
- rys.; tab.; wykr.; Bibliografia (na s.) - 189; Bibliografia (liczba pozycji) - 15; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 359
- Keywords in English
- plasma nitriding, Ti6Al7Nb, XRD, TEM
- DOI
- DOI:10.1016/j.surfcoat.2018.12.071 Opening in a new tab
- URL
- https://www.sciencedirect.com/science/article/pii/S025789721831394X Opening in a new tab
- Related project
- Międzynarodowe interdyscyplinarne studia doktoranckie z zakresu nauk o materiałach z wykładowym językiem angielskim. . Project leader at PK: , ,
- Wprowadzenie do praktyki klinicznej oryginalnej polskiej wszczepialnej wirowej pompy wspomagania serca oraz systemu zdalnego monitorowania i nadzorowanej zdalnie rehabilitacji pacjentów na wspomaganiu serca. . Project leader at PK: , ,
- Międzynarodowe interdyscyplinarne studia doktoranckie z zakresu nauk o materiałach z wykładowym językiem angielskim. . Project leader at PK: , ,
- Language
- eng (en) English
- Score (nominal)
- 0
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT32d5ba59838c4012ac7bbcffefa07d40/
- URN
urn:pkr-prod:CUT32d5ba59838c4012ac7bbcffefa07d40
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.