Mechanical properties of single and polycrystalline α-Al2O3 coatings grown by chemical vapor deposition
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In: Surface & coatings technology, Vol. 410.2021, No. 25 March, 126959, 11.02.2021, p. 1-7.
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TY - JOUR
T1 - Mechanical properties of single and polycrystalline α-Al2O3 coatings grown by chemical vapor deposition
AU - Konstantiniuk, Fabian
AU - Tkadletz, Michael
AU - Kainz, Christina
AU - Czettl, Christoph
AU - Schalk, Nina
N1 - Publisher Copyright: © 2021 The Author(s)
PY - 2021/2/11
Y1 - 2021/2/11
N2 - Due to the highly anisotropic mechanical properties of corundum, the lifetime of α-Al 2O 3 coated cutting tools is strongly influenced by its texture. However, limited literature is available on orientation dependent mechanical properties of α-Al 2O 3 coatings. Thus, in the present study, (0001), (11-20), (1-102) oriented single crystalline α-Al 2O 3 coatings and a state of the art (0001) textured polycrystalline α-Al 2O 3 coating were synthesized using chemical vapor deposition (CVD) on sapphire and cemented carbide substrates and the mechanical properties were investigated. The morphology of the coatings was studied by scanning electron microscopy and the respective orientation verified by electron backscatter diffraction. The (0001) oriented α-Al 2O 3 single crystalline coating yielded a slightly higher hardness of 34.4 ± 2.0 GPa compared to the other oriented coatings. Also, the maximum Young's modulus was observed for the (0001) oriented α-Al 2O 3 single crystalline coating, with a value of 451 ± 25 GPa. Furthermore, micromechanical tests were carried out to determine the fracture stress and fracture toughness, where the (11-20) oriented single crystalline coating exhibited the highest values of 11.2 ± 0.4 GPa and 4.1 ± 0.2 MPa m 1/2, respectively. Compared to the (0001) oriented single crystalline coating, the state of the art (0001) textured polycrystalline coating exhibits lower hardness, Young's modulus, fracture stress and fracture toughness values.
AB - Due to the highly anisotropic mechanical properties of corundum, the lifetime of α-Al 2O 3 coated cutting tools is strongly influenced by its texture. However, limited literature is available on orientation dependent mechanical properties of α-Al 2O 3 coatings. Thus, in the present study, (0001), (11-20), (1-102) oriented single crystalline α-Al 2O 3 coatings and a state of the art (0001) textured polycrystalline α-Al 2O 3 coating were synthesized using chemical vapor deposition (CVD) on sapphire and cemented carbide substrates and the mechanical properties were investigated. The morphology of the coatings was studied by scanning electron microscopy and the respective orientation verified by electron backscatter diffraction. The (0001) oriented α-Al 2O 3 single crystalline coating yielded a slightly higher hardness of 34.4 ± 2.0 GPa compared to the other oriented coatings. Also, the maximum Young's modulus was observed for the (0001) oriented α-Al 2O 3 single crystalline coating, with a value of 451 ± 25 GPa. Furthermore, micromechanical tests were carried out to determine the fracture stress and fracture toughness, where the (11-20) oriented single crystalline coating exhibited the highest values of 11.2 ± 0.4 GPa and 4.1 ± 0.2 MPa m 1/2, respectively. Compared to the (0001) oriented single crystalline coating, the state of the art (0001) textured polycrystalline coating exhibits lower hardness, Young's modulus, fracture stress and fracture toughness values.
UR - http://www.scopus.com/inward/record.url?scp=85101489704&partnerID=8YFLogxK
U2 - 10.1016/j.surfcoat.2021.126959
DO - 10.1016/j.surfcoat.2021.126959
M3 - Article
VL - 410.2021
SP - 1
EP - 7
JO - Surface & coatings technology
JF - Surface & coatings technology
SN - 0257-8972
IS - 25 March
M1 - 126959
ER -
