Publications in Scientific Journals:
C. Fuger, R Hahn, L. Zauner, T. Wojcik, M. Weiss, A. Limbeck, O Hunold, P. Polcik, H. Riedl:
"Anisotropic super-hardness of hexagonal WB2ąz thin films";
Materials Research Letters,
10
(2022),
2;
70
- 77.
English abstract:
Transition metal diboride-based thin films are promising candidates to replace state-of-the-art protective and functional coating materials due to their unique properties. Here, we focus on hexagonal WB2-z, showing that the AlB2 structure is stabilized by B vacancies exhibiting its energetic minima at sub-stoichiometric WB1.5. Nanoindentation reveals super-hardness of 0001 oriented α-WB2-z coatings, linearly decreasing by more than 15 GPa with predominant 101 ̅1 orientation. This anisotropy is attributed to differences in the generalized stacking fault energy of basal and pyramidal slip systems, highlighting the feasibility of tuning mechanical properties by crystallographic orientation relations.
Keywords:
WB2, physical vapour deposition, DFT, structural defects, anisotropy
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1080/21663831.2021.2021308
Related Projects:
Project Head Helmut Riedl:
CDL-SEC
Created from the Publication Database of the Vienna University of Technology.