(Ti,Al)O<sub>2</sub> Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb Alloy
Plasma nitriding of titanium alloys is capable of effective surface hardening at temperatures significantly lower than gas nitriding, but at a cost of much stronger surface roughening. Especially interesting are treatments performed at the lower end of the temperature window used in such cases, as t...
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MDPI AG
2021-05-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/10/2658 |
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| author | Krzysztof Szymkiewicz Jerzy Morgiel Łukasz Maj Małgorzata Pomorska |
| author_facet | Krzysztof Szymkiewicz Jerzy Morgiel Łukasz Maj Małgorzata Pomorska |
| author_sort | Krzysztof Szymkiewicz |
| collection | DOAJ |
| description | Plasma nitriding of titanium alloys is capable of effective surface hardening at temperatures significantly lower than gas nitriding, but at a cost of much stronger surface roughening. Especially interesting are treatments performed at the lower end of the temperature window used in such cases, as they are least damaging to highly polished parts. Therefore identifying the most characteristic defects is of high importance. The present work was aimed at identifying the nature of pin-point bumps formed at the glow discharged plasma nitrided Ti-6Al-7Nb alloy using plan-view scanning and cross-section transmission electron microscopy methods. It helped to establish that these main surface defects developed at the treated surface are (Ti,Al)O<sub>2</sub> nano-whiskers of diameter from 20 nm to 40 nm, and length up to several hundreds of nanometers. The performed investigation confirmed that the surface imperfection introduced by plasma nitriding at the specified range should be of minor consequences to the mechanical properties of the treated material. |
| first_indexed | 2024-03-10T11:16:06Z |
| format | Article |
| id | doaj.art-562e41a73d2c41f89ee2df56b8e4579d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T11:16:06Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-562e41a73d2c41f89ee2df56b8e4579d2023-11-21T20:23:35ZengMDPI AGMaterials1996-19442021-05-011410265810.3390/ma14102658(Ti,Al)O<sub>2</sub> Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb AlloyKrzysztof Szymkiewicz0Jerzy Morgiel1Łukasz Maj2Małgorzata Pomorska3Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta st., 30-059 Kraków, PolandInstitute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta st., 30-059 Kraków, PolandInstitute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta st., 30-059 Kraków, PolandInstitute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta st., 30-059 Kraków, PolandPlasma nitriding of titanium alloys is capable of effective surface hardening at temperatures significantly lower than gas nitriding, but at a cost of much stronger surface roughening. Especially interesting are treatments performed at the lower end of the temperature window used in such cases, as they are least damaging to highly polished parts. Therefore identifying the most characteristic defects is of high importance. The present work was aimed at identifying the nature of pin-point bumps formed at the glow discharged plasma nitrided Ti-6Al-7Nb alloy using plan-view scanning and cross-section transmission electron microscopy methods. It helped to establish that these main surface defects developed at the treated surface are (Ti,Al)O<sub>2</sub> nano-whiskers of diameter from 20 nm to 40 nm, and length up to several hundreds of nanometers. The performed investigation confirmed that the surface imperfection introduced by plasma nitriding at the specified range should be of minor consequences to the mechanical properties of the treated material.https://www.mdpi.com/1996-1944/14/10/2658(Ti,Al)O<sub>2</sub> whiskersplasma nitridingTi6Al7Nb alloyTEM |
| spellingShingle | Krzysztof Szymkiewicz Jerzy Morgiel Łukasz Maj Małgorzata Pomorska (Ti,Al)O<sub>2</sub> Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb Alloy Materials (Ti,Al)O<sub>2</sub> whiskers plasma nitriding Ti6Al7Nb alloy TEM |
| title | (Ti,Al)O<sub>2</sub> Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb Alloy |
| title_full | (Ti,Al)O<sub>2</sub> Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb Alloy |
| title_fullStr | (Ti,Al)O<sub>2</sub> Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb Alloy |
| title_full_unstemmed | (Ti,Al)O<sub>2</sub> Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb Alloy |
| title_short | (Ti,Al)O<sub>2</sub> Whiskers Grown during Glow Discharge Nitriding of Ti-6Al-7Nb Alloy |
| title_sort | ti al o sub 2 sub whiskers grown during glow discharge nitriding of ti 6al 7nb alloy |
| topic | (Ti,Al)O<sub>2</sub> whiskers plasma nitriding Ti6Al7Nb alloy TEM |
| url | https://www.mdpi.com/1996-1944/14/10/2658 |
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