Evolution of the fracture properties of arc evaporated Ti1-xAlxN coatings with increasing Al content

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Evolution of the fracture properties of arc evaporated Ti1-xAlxN coatings with increasing Al content. / Waldl, Helene; Tkadletz, Michael; Lechner, Alexandra et al.
in: Surface & coatings technology, Jahrgang 444.2022, Nr. 25 August, 128690, 16.07.2022.

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

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@article{14085eda8ef34e0da2e5923d7e2f0801,
title = "Evolution of the fracture properties of arc evaporated Ti1-xAlxN coatings with increasing Al content",
abstract = "Although the positive effect of an increasing Al content in Ti1-xAlxN hard coatings within the cubic regime is thoroughly investigated, there is a lack of systematic studies on the fracture properties. Thus within the present work, seven Ti1-xAlxN coatings with increasing Al content from x = 0 up to x = 0.78 were deposited by cathodic arc evaporation. Using scanning electron microscopy and X-ray diffraction, a grain refinement with increasing Al content up to x = 0.65 could be observed, while the coating with the highest Al content of x = 0.78 showed again a coarser grain size. The presence of a single phase face-centered cubic (fcc)-structure up to an Al content of x = 0.49 was confirmed by X-ray diffraction. Ti0.44Al0.56N and Ti0.35Al0.65N exhibited a dual phase fcc- and wurtzitic (w)-structure, where for the latter the w-structure is dominating. A single phase w-structure was observed for the Ti0.22Al0.78N coating. Nano-indentation experiments revealed an increasing hardness with increasing Al content up to x = 0.56 and thus, as long as the fcc-phase is dominating, due to decreasing grain size and increasing compressive stress. For the coatings with dominating and pure w-structure a drop in hardness was observed. Similar to the hardness, the micromechanical bending tests also revealed improving fracture properties with increasing Al content up to x = 0.56 and deteriorating fracture properties when the w-structure becomes dominant.",
author = "Helene Waldl and Michael Tkadletz and Alexandra Lechner and Christoph Czettl and Markus Pohler and Nina Schalk",
year = "2022",
month = jul,
day = "16",
doi = "10.1016/j.surfcoat.2022.128690",
language = "English",
volume = "444.2022",
journal = "Surface & coatings technology",
issn = "0257-8972",
publisher = "Elsevier",
number = "25 August",

}

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TY - JOUR

T1 - Evolution of the fracture properties of arc evaporated Ti1-xAlxN coatings with increasing Al content

AU - Waldl, Helene

AU - Tkadletz, Michael

AU - Lechner, Alexandra

AU - Czettl, Christoph

AU - Pohler, Markus

AU - Schalk, Nina

PY - 2022/7/16

Y1 - 2022/7/16

N2 - Although the positive effect of an increasing Al content in Ti1-xAlxN hard coatings within the cubic regime is thoroughly investigated, there is a lack of systematic studies on the fracture properties. Thus within the present work, seven Ti1-xAlxN coatings with increasing Al content from x = 0 up to x = 0.78 were deposited by cathodic arc evaporation. Using scanning electron microscopy and X-ray diffraction, a grain refinement with increasing Al content up to x = 0.65 could be observed, while the coating with the highest Al content of x = 0.78 showed again a coarser grain size. The presence of a single phase face-centered cubic (fcc)-structure up to an Al content of x = 0.49 was confirmed by X-ray diffraction. Ti0.44Al0.56N and Ti0.35Al0.65N exhibited a dual phase fcc- and wurtzitic (w)-structure, where for the latter the w-structure is dominating. A single phase w-structure was observed for the Ti0.22Al0.78N coating. Nano-indentation experiments revealed an increasing hardness with increasing Al content up to x = 0.56 and thus, as long as the fcc-phase is dominating, due to decreasing grain size and increasing compressive stress. For the coatings with dominating and pure w-structure a drop in hardness was observed. Similar to the hardness, the micromechanical bending tests also revealed improving fracture properties with increasing Al content up to x = 0.56 and deteriorating fracture properties when the w-structure becomes dominant.

AB - Although the positive effect of an increasing Al content in Ti1-xAlxN hard coatings within the cubic regime is thoroughly investigated, there is a lack of systematic studies on the fracture properties. Thus within the present work, seven Ti1-xAlxN coatings with increasing Al content from x = 0 up to x = 0.78 were deposited by cathodic arc evaporation. Using scanning electron microscopy and X-ray diffraction, a grain refinement with increasing Al content up to x = 0.65 could be observed, while the coating with the highest Al content of x = 0.78 showed again a coarser grain size. The presence of a single phase face-centered cubic (fcc)-structure up to an Al content of x = 0.49 was confirmed by X-ray diffraction. Ti0.44Al0.56N and Ti0.35Al0.65N exhibited a dual phase fcc- and wurtzitic (w)-structure, where for the latter the w-structure is dominating. A single phase w-structure was observed for the Ti0.22Al0.78N coating. Nano-indentation experiments revealed an increasing hardness with increasing Al content up to x = 0.56 and thus, as long as the fcc-phase is dominating, due to decreasing grain size and increasing compressive stress. For the coatings with dominating and pure w-structure a drop in hardness was observed. Similar to the hardness, the micromechanical bending tests also revealed improving fracture properties with increasing Al content up to x = 0.56 and deteriorating fracture properties when the w-structure becomes dominant.

U2 - 10.1016/j.surfcoat.2022.128690

DO - 10.1016/j.surfcoat.2022.128690

M3 - Article

VL - 444.2022

JO - Surface & coatings technology

JF - Surface & coatings technology

SN - 0257-8972

IS - 25 August

M1 - 128690

ER -