Fracture toughness trends of modulus-matched TiN/(Cr,Al)N thin film superlattices

Buchinger, Julian; Wagner, Antonia; Chen, Zhuo; Zhang, Zaoli; Holec, David; Mayrhofer, P.H.; Bartosik, Matthias

doi:10.1016/j.actamat.2020.10.068

Cited by 43 publications

(15 citation statements)

References 74 publications

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“…A variation from 363 to 469 GPa was measured for Al 28.4 Cr 18.6 N 55 in different coating states. The high value was measured for a highly 100-oriented coating deposited on MgO (100) substrates [71]. Thus, a relatively wide variation of experimental results, besides the measuring conditions, must be anticipated.…”

Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 96%

“…The fracture toughness K IC of sputtered Al 28.4 Cr 18.6 N 55 was measured by micromechanical bending tests at 1.3 ± 0.1 MPa √ m, which is lower than that of TiN at 2.0 ± 0.1 MPa √ m related to domain size effects, but it is possible to raise this in a superlattice combination of the two materials [71].…”

Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 97%

“…Ab initio calculations have shown that the Poisson's ratio drops from about 0.27 for low Al contents to about 0.2 for an Al content of 70 at.% [70]. Figure 9 shows the ab initio calculated Young's moduli (E) as a function of the Al content for fcc (Al,Cr)N [70,71]. Selected Young's moduli measured by nanoindentation from [64,71] have been added.…”

Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 99%

“…Figure 9 shows the ab initio calculated Young's moduli (E) as a function of the Al content for fcc (Al,Cr)N [70,71]. Selected Young's moduli measured by nanoindentation from [64,71] have been added. The Young's modulus increases with an increasing Al content.…”

Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 99%

“…The Young's modulus of (AlCr)N coatings drops significantly when the mixed-phase structure fcc + hcp is reached [43], as well as for Si-alloyed (AlCr)N coatings of, for example, Al 33.4 Cr 18.3 Si 2.3 N 46 O 0.7 [73]. It should be noted that large variations of measured E values for fcc-(Al,Cr)N coatings have been published for coatings of nearly the same composition, for example, from 300 GPa (Al/(Al + Cr) content of 68 at.%) [73] to 469 GPa (Al/(Al + Cr) content of 63 at.%) [71]. Different sample conditions (thickness and substrate) and measurement systems themselves will influence the measured value.…”

Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 99%

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Quo Vadis: AlCr-Based Coatings in Industrial Applications

et al. 2021

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AlCr-based hard nitride coatings with different chemical compositions and architectures have been successfully developed and applied over the last few decades. Coating properties are mainly influenced by deposition conditions and the Al/Cr content. The fcc structure is dominant for an Al-content up to Al0.7Cr0.3N and is preferred for most cutting applications. Different (AlCrX)N alloying concepts, including X = Si, W, B, V, have been investigated in order to enhance oxidation resistance and wear behaviour and to provide tribological properties. AlCr-based oxynitrides and even pure oxides (Al1−xCrx)2O3 with different crystalline structures have been explored. Multi- and nanolayered coatings within the AlCr materials system, as well as in combination with (TiSi)N, for example, have also been implemented industrially. The dominant deposition technology is the vacuum arc process. Recently, advanced high-power impulse magnetron sputtering (HiPIMS) processes have also been successfully applied on an industrial scale. This paper describes basic coating properties and briefly addresses the main aspects of the coating processes as well as selected industrial applications.

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Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 96%

Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 97%

Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 99%

Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 99%

Section: Poisson's Ratio Young's Moduli Fracture Toughnessmentioning

confidence: 99%

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Quo Vadis: AlCr-Based Coatings in Industrial Applications

et al. 2021

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Accelerating the Exploration of High‐Entropy Alloys: Synergistic Effects of Integrating Computational Simulation and Experiments

Jiang,

Li,

Wang

et al. 2024

Small Structures

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High‐entropy alloys (HEAs) are novel materials composed of multiple elements with nearly equal concentrations and they exhibit exceptional properties such as high strength, ductility, thermal stability, and corrosion resistance. However, the intricate and diverse structures of HEAs pose significant challenges to understanding and predicting their behavior at different length scales. This review summarizes recent advances in computational simulations and experiments of structure‐property relationships in HEAs at the nano/micro scales. Various methods such as first‐principles calculations, molecular dynamics simulations, phase diagram calculations, and finite element simulations are discussed for revealing atomic/chemical and crystal structures, defect formation and migration, diffusion and phase transition, phase formation and stability, stress‐strain distribution, deformation behavior, and thermodynamic properties of HEAs. Emphasis is placed on the synergistic effects of computational simulations and experiments in terms of validation and complementarity to provide insights into the underlying mechanisms and evolutionary rules of HEAs. Additionally, current challenges and future directions for computational and experimental studies of HEAs are identified, including accuracy, efficiency, and scalability of methods, integration of multiscale and multiphysics models, and exploration of practical applications of HEAs.

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