Precipitation-based grain boundary design alters Inter- to Trans-granular Fracture in AlCrN Thin Films

Meindlhumer, Michael; Ziegelwanger, Tobias; Zálešák, Jakub; Hans, Marcus; Löfler, Lukas; Spor, S.; Jäger, Nikolaus; Stark, Andreas; Hruby, Hynek; Daniel, Rostislav; Holec, David; Schneider, Jochen M.; Mitterer, Christian; Keckes, Jozef

doi:10.1016/j.actamat.2022.118156

Cited by 19 publications

(2 citation statements)

References 90 publications

(115 reference statements)

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“…To add to it, it must be mentioned that defects can facilitate crack propagation, delamination and fracture. This is especially evident when there are micro-voids/columnar boundaries in the morphology of the coatings because they have low cohesive energy to propagate cracks [33,49]. To study this feature in samples S50, S125 and S200, Figure 10b shows the predictable trend (higher defect density can cause higher deformation and wear characteristics).…”

Section: Discussionmentioning

confidence: 99%

Effect of Substrate Bias Voltage on Microstructure and Mechanical Properties of Cr-Nb-Ti-Zr-N-O Ceramic Thin Films Produced by Reactive Sputtering

et al. 2023

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Hard coatings are applied in various applications to protect substrates from wear and corrosion. In the present study, multi-element ceramic films are deposited by reactive sputtering. The level of substrate bias voltage (−50, −125 and −200 V) is changed to investigate the structural and mechanical properties of Cr-Nb-Ti-Zr-N thin films. Chemical analysis (using EDS, XRD and Raman spectroscopy) reveals that these thin films (with a high amount of oxygen) are composed of a nanocomposite phase structure (amorphous and nano-crystalline phases). CrO2 and NbxN crystalline phases exist in an amorphous matrix in the coatings. By increasing the substrate voltage (from −50 to −200 V), the nitrogen content (from 30 to 40 at. %) increases, and CrxN crystalline phases are generated in S125 and S200. Morphological, topological and image analysis (employing FESEM and AFM) data show that the intermediate level of substrate bias voltage (sample S125) can produce a uniform surface with minimum defect density (15%). In addition, S125 has the minimum level of roughness (16.6 nm), skewness (0.2) and kurtosis (2.8). Therefore, the hardness, toughness and wear resistance (extracted from indentation and scratch tests) of this sample is maximum (H is 24.5 GPa and H/E is 0.107), while sample S50 shows complete fracture and delamination.

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Section: Discussionmentioning

confidence: 99%

Effect of Substrate Bias Voltage on Microstructure and Mechanical Properties of Cr-Nb-Ti-Zr-N-O Ceramic Thin Films Produced by Reactive Sputtering

et al. 2023

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“…The fracture stress was calculated using Equation 4.26. The fracture toughness was determined using the fracture stress from the notched cantilevers according to [68]. Lastly, the fracture surfaces as observed in SEM can reveal important information on the fracture behavior.…”

Section: Microcantilever Bendingmentioning

confidence: 99%

Nanostructured TiN/ZrAlN and HfAlN Thin Films : Effect of Structure on Mechanical Properties

Lorentzon

2024

Linköping Studies in Science and Technology. Licentiate Thesis

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Transition metal nitrides are a remarkable group of ceramic materials that offer exceptional properties such as high hardness, low tribological wear, excellent thermal stability, and high oxidation resistance. Alloys such as TiN, CrN, VN, ZrN, and HfN have been identified as ideal candidates for protective coatings on cutting tool inserts in the metal processing industry. While TiAlN has been widely accepted, ZrAlN and HfAlN alloys have much unexplored potential. With a melting point of HfN at 3300 °C, approximately 400 °C higher than TiN, HfAlN shows great potential for age-hardening at even higher temperatures. These remarkable materials inspire us to push the limits of what is possible, and to continue to innovate materials science.The work performed in this thesis focuses on the development of hard coatings using ionassisted reactive magnetron sputtering. The coatings are based on group IV TM-Al-N, where TM is either Ti, Zr, or Hf. The aim is to enhance the performance of these ceramic coatings by simultaneously increasing their hardness and toughness. To achieve this, the growth mechanisms, structure, and mechanical properties of the films were studied in detail. The coatings were deposited onto single crystal Si(001) and MgO(001) substrates.I have been fortunate to work at a place with brilliant people at Linköping University. My journey had a rocky start in the middle of a global pandemic but despite this I got a superb reception at the department, largely thanks to my supervisor Naureen Ghafoor. We had to meet online mostly and keep our distance in physical meetings, but that didn't stop Naureen from making me feel warmly welcomed at IFM, and quickly brought me up to speed. You have always been available for support, suggestions, feedback, and new perspectives on any problem that came up during this time. We have also had some very nice trips to conferences and experiments abroad which were both productive and fun. Thank you! A big thank you to my co-supervisors Jens Birch and Johanna Rosén for happily sharing your vast knowledge. The support is greatly appreciated! I also want to express my gratitude to Per Sandström. You are an indispensable help in the lab and a superb colleague and friend. I really enjoy our conversations and topics ranging from high and low. I have also been lucky to get to teach on two of your courses. To Fredrik Eriksson, you have been a great support, in particular for solving problems in the labs. You even put up with my calls in the evening or when you're under the weather.Big thanks to Michael Meindlhumer, Naoki Takata and Tianqi Zhu for your expertise and collaboration in discovering the mechanical response of my films using advanced microcantilever bending and micropillar compression techniques. Your support has been critical to this work. A big thank you to Justinas Palisaitis for all the help and amazing times in Arwen and the beautiful STEM micrographs, and to Grzegorz Greczynski for the help with XPS. With your support this work is elevated to a higher level. To Lars Hult...

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High-density twin boundaries in transition metal nitride coating with boron doping

et al. 2023

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Precipitation-based grain boundary design alters Inter- to Trans-granular Fracture in AlCrN Thin Films

Cited by 19 publications

References 90 publications

Effect of Substrate Bias Voltage on Microstructure and Mechanical Properties of Cr-Nb-Ti-Zr-N-O Ceramic Thin Films Produced by Reactive Sputtering

Effect of Substrate Bias Voltage on Microstructure and Mechanical Properties of Cr-Nb-Ti-Zr-N-O Ceramic Thin Films Produced by Reactive Sputtering

Nanostructured TiN/ZrAlN and HfAlN Thin Films : Effect of Structure on Mechanical Properties

High-density twin boundaries in transition metal nitride coating with boron doping

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