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Influence of Yttrium on the Thermal Stability of Ti-Al-N Thin Films

Ti(1-x)Al(x)N coated tools are commonly used in high-speed machining, where the cutting edge of an end-mill or insert is exposed to temperatures up to 1100 °C. Here, we investigate the effect of Yttrium addition on the thermal stability of Ti(1-x)Al(x)N coatings. Reactive DC magnetron sputtering of...

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Autores principales: Moser, Martin, Kiener, Daniel, Scheu, Christina, Mayrhofer, Paul H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5445888/
http://dx.doi.org/10.3390/ma3031573
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author Moser, Martin
Kiener, Daniel
Scheu, Christina
Mayrhofer, Paul H.
author_facet Moser, Martin
Kiener, Daniel
Scheu, Christina
Mayrhofer, Paul H.
author_sort Moser, Martin
collection PubMed
description Ti(1-x)Al(x)N coated tools are commonly used in high-speed machining, where the cutting edge of an end-mill or insert is exposed to temperatures up to 1100 °C. Here, we investigate the effect of Yttrium addition on the thermal stability of Ti(1-x)Al(x)N coatings. Reactive DC magnetron sputtering of powder metallurgically prepared Ti(0.50)Al(0.50), Ti(0.49)Al(0.49)Y(0.02), and Ti(0.46)Al(0.46)Y(0.08) targets result in the formation of single-phase cubic (c) Ti(0.45)Al(0.55)N, binary cubic/wurtzite c/w-Ti(0.41)Al(0.57)Y(0.02)N and singe-phase w-Ti(0.38)Al(0.54)Y(0.08)N coatings. Using pulsed DC reactive magnetron sputtering for the Ti(0.49)Al(0.49)Y(0.02) target allows preparing single-phase c-Ti(0.46)Al(0.52)Y(0.02)N coatings. By employing thermal analyses in combination with X-ray diffraction and transmission electron microscopy investigations of as deposited and annealed (in He atmosphere) samples, we revealed that Y effectively retards the decomposition of the Ti(1-x-y)Al(x)Y(y)N solid-solution to higher temperatures and promotes the precipitation of c-TiN, c-YN, and w-AlN. Due to their different microstructure and morphology already in the as deposited state, the hardness of the coatings decreases from ~35 to 22 GPa with increasing Y-content and increasing wurtzite phase fraction. Highest peak hardness of ~38 GPa is obtained for the Y-free c-Ti(0.45)Al(0.55)N coating after annealing at T(a) = 950 °C, due to spinodal decomposition. After annealing above 1000 °C the highest hardness is obtained for the 2 mol % YN containing c-Ti(0.46)Al(0.52)Y(0.02)N coating with ~29 and 28 GPa for T(a) = 1150 and 1200 °C, respectively.
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spelling pubmed-54458882017-07-28 Influence of Yttrium on the Thermal Stability of Ti-Al-N Thin Films Moser, Martin Kiener, Daniel Scheu, Christina Mayrhofer, Paul H. Materials (Basel) Article Ti(1-x)Al(x)N coated tools are commonly used in high-speed machining, where the cutting edge of an end-mill or insert is exposed to temperatures up to 1100 °C. Here, we investigate the effect of Yttrium addition on the thermal stability of Ti(1-x)Al(x)N coatings. Reactive DC magnetron sputtering of powder metallurgically prepared Ti(0.50)Al(0.50), Ti(0.49)Al(0.49)Y(0.02), and Ti(0.46)Al(0.46)Y(0.08) targets result in the formation of single-phase cubic (c) Ti(0.45)Al(0.55)N, binary cubic/wurtzite c/w-Ti(0.41)Al(0.57)Y(0.02)N and singe-phase w-Ti(0.38)Al(0.54)Y(0.08)N coatings. Using pulsed DC reactive magnetron sputtering for the Ti(0.49)Al(0.49)Y(0.02) target allows preparing single-phase c-Ti(0.46)Al(0.52)Y(0.02)N coatings. By employing thermal analyses in combination with X-ray diffraction and transmission electron microscopy investigations of as deposited and annealed (in He atmosphere) samples, we revealed that Y effectively retards the decomposition of the Ti(1-x-y)Al(x)Y(y)N solid-solution to higher temperatures and promotes the precipitation of c-TiN, c-YN, and w-AlN. Due to their different microstructure and morphology already in the as deposited state, the hardness of the coatings decreases from ~35 to 22 GPa with increasing Y-content and increasing wurtzite phase fraction. Highest peak hardness of ~38 GPa is obtained for the Y-free c-Ti(0.45)Al(0.55)N coating after annealing at T(a) = 950 °C, due to spinodal decomposition. After annealing above 1000 °C the highest hardness is obtained for the 2 mol % YN containing c-Ti(0.46)Al(0.52)Y(0.02)N coating with ~29 and 28 GPa for T(a) = 1150 and 1200 °C, respectively. Molecular Diversity Preservation International 2010-03-04 /pmc/articles/PMC5445888/ http://dx.doi.org/10.3390/ma3031573 Text en © 2010 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland. This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Moser, Martin
Kiener, Daniel
Scheu, Christina
Mayrhofer, Paul H.
Influence of Yttrium on the Thermal Stability of Ti-Al-N Thin Films
title Influence of Yttrium on the Thermal Stability of Ti-Al-N Thin Films
title_full Influence of Yttrium on the Thermal Stability of Ti-Al-N Thin Films
title_fullStr Influence of Yttrium on the Thermal Stability of Ti-Al-N Thin Films
title_full_unstemmed Influence of Yttrium on the Thermal Stability of Ti-Al-N Thin Films
title_short Influence of Yttrium on the Thermal Stability of Ti-Al-N Thin Films
title_sort influence of yttrium on the thermal stability of ti-al-n thin films
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5445888/
http://dx.doi.org/10.3390/ma3031573
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