Anisotropic super-hardness of hexagonal WB<sub>2±<i>z</i></sub> thin films

Fuger, C.; Hahn, Rainer; Zauner, L.; Wójcik, Tomasz; Weiß, Maximilian; Limbeck, Andreas; Hunold, O.; Polcik, P.; Riedl, H.

doi:10.1080/21663831.2021.2021308

Cited by 31 publications

(13 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In both cases, the mechanical properties are inversely related to the boron ratio presented in Figure 3 . This behavior is consistent with DFT calculations made by Fuger et al [ 20 ]. For WB 2 that crystallize in a P6/mmm structure (α-type), increasing the boron content lowers the hardness and Young’s modulus.…”

Section: Resultssupporting

confidence: 93%

Mechanical and Thermal Properties of W-Ta-B Coatings Deposited by High-Power Impulse Magnetron Sputtering (HiPIMS)

et al. 2023

View full text Add to dashboard Cite

We present the deposition and characterization of tungsten-tantalum diboride (W,Ta)B2 coatings prepared by the high-power impulse magnetron sputtering technique. We evaluated the influence of pulse duration and substrate bias on the properties of (W,Ta)B2 films. A high hardness of up to 35 GPa measured by nanoindentation was simultaneously obtained with good elastic properties. Changing the pulse duration greatly affected the B/(W+Ta) atomic ratio, which influenced the properties of the coatings. The deposited films are thermally stable at up to 1000 °C in vacuum and are able to withstand oxidation at 500 °C.

show abstract

Section: Resultssupporting

confidence: 93%

Mechanical and Thermal Properties of W-Ta-B Coatings Deposited by High-Power Impulse Magnetron Sputtering (HiPIMS)

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Specifically, within the Cr-based compounds, the atoms are bound by a mixture of strong covalent, ionic, and metallic bonds, as such they are less ductile compared to pure Cr, which is predominantly characterized by the latter type. Nevertheless, especially CrB 2 may possess a significant ductile character -in combination with a strong, covalently bound 2D boron network [95] thus supporting the high fracture toughness value.…”

Section: Lar Connection To Intrinsic (Toughening) Mechanism That Coun...mentioning

confidence: 89%

Assessing the Fracture and Fatigue Resistance of Nanostructured Thin Films

et al. 2022

View full text Add to dashboard Cite

“…Transition metal diborides (TMB 2 s) are a vibrant research topic in application-oriented coating developments [1][2][3][4][5][6] and represent promising materials for usage in extreme environments, including ultra-high temperatures and severe mechanical loads. Among their attractive properties are chemical stability and inertness, high melting point, high hardness, good electrical and thermal conductivity, corrosion, and erosion resistance as well as high wear and thermal-shock resistance [7,8].…”

Section: Introductionmentioning

confidence: 99%

On energetics of allotrope transformations in transition-metal diborides via plane-by-plane shearing

Leiner¹,

Koutná²,

Mayrhofer³

et al. 2023

Preprint

View full text Add to dashboard Cite

Transition metal diborides crystallise in the α, γ, or ω type structure, in which pure transition metal layers alternate with pure boron layers stacked along the hexagonal [0001] axis. Here we view the prototypes as different stackings of the transition metal planes and suppose they can transform from one into another by a displacive transformation. Employing first-principles calculations, we simulate sliding of individual planes in the group IV-VII transition metal diborides along a transformation pathway connecting the α, γ, and ω structure. Chemistry-related trends are predicted in terms of energetic and structural changes along a transformation pathway, together with mechanical and dynamical stability of the different stackings. Our results suggest that MnB2 and MoB2 possess the overall lowest sliding barriers among the investigated TMB2s. Furthermore, we discuss trends in strength and ductility indicators, including the Young's modulus or Cauchy pressure, derived from elastic constants.

show abstract

Anisotropic super-hardness of hexagonal WB_2±z thin films

Cited by 31 publications

References 45 publications

Mechanical and Thermal Properties of W-Ta-B Coatings Deposited by High-Power Impulse Magnetron Sputtering (HiPIMS)

Mechanical and Thermal Properties of W-Ta-B Coatings Deposited by High-Power Impulse Magnetron Sputtering (HiPIMS)

Assessing the Fracture and Fatigue Resistance of Nanostructured Thin Films

On energetics of allotrope transformations in transition-metal diborides via plane-by-plane shearing

Contact Info

Product

Resources

About

Anisotropic super-hardness of hexagonal WB2±z thin films

Cited by 31 publications

References 45 publications

Mechanical and Thermal Properties of W-Ta-B Coatings Deposited by High-Power Impulse Magnetron Sputtering (HiPIMS)

Mechanical and Thermal Properties of W-Ta-B Coatings Deposited by High-Power Impulse Magnetron Sputtering (HiPIMS)

Assessing the Fracture and Fatigue Resistance of Nanostructured Thin Films

On energetics of allotrope transformations in transition-metal diborides via plane-by-plane shearing

Contact Info

Product

Resources

About

Anisotropic super-hardness of hexagonal WB_2±z thin films