NDLI: In Situ Investigations on Stress and Microstructure Evolution in Polycrystalline $Ti(C,N)/α-Al_{2}O_{3}$ CVD Coatings under Thermal Cycling Loads

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In Situ Investigations on Stress and Microstructure Evolution in Polycrystalline $Ti(C,N)/α-Al_{2}O_{3}$ CVD Coatings under Thermal Cycling Loads

Content Provider	MDPI
Author	Jos, é García Moreno, Maiara Wan, Wei Apel, Daniel Pinto, Haroldo Meixner, Matthias Klaus, Manuela Genzel, Christoph
Copyright Year	2021
Description	The stress behavior and the associated microstructure evolution of industrial Ti(C,N)/α-Al2O3 coatings subjected to thermal cycling are investigated by in situ energy dispersive synchrotron X-ray diffraction and transmission electron microscopy. Temperature-dependent stresses and changes in microstructural parameters (domain size and microstrain) are analyzed by in situ measurements at different temperatures between 25 and 800 °C, both in the heating up and cooling down step, including several thermal cycles. Transmission electron microscopy is used to evaluate defects before and after the thermal treatment. The introduction of high compressive stresses in α-Al2O3 by top-blasting is connected to a high defect density at the basal planes of the alumina layer. The stress relaxation of the alumina layer at high temperatures is associated with a successive annihilation of defects until a reversible temperature-dependent stress condition is set. Top-blasting does not change the initial microstructure and residual stress of the Ti(C,N) layer. Ti(C,N) shows a cyclic stress behavior associated with the heat treatment and an elastic deformation behavior in the temperature range investigated.
Starting Page	158
e-ISSN	20734352
DOI	10.3390/cryst11020158
Journal	Crystals
Issue Number	2
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-02-04
Access Restriction	Open
Subject Keyword	Crystals Coatings and Films Ti(c,n)/α-al2o3 Cvd Coatings Residual and Thermal Stresses Synchrotron X-ray Diffraction Tem Characterization Microstructure Evolution
Content Type	Text
Resource Type	Article

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