Journal
MATERIALS & DESIGN
Volume 218, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2022.110695
Keywords
PVD; DFT; Boronnitrides; Superhard materials; Entropy
Categories
Funding
- Austrian COMET Program [872176]
- Swedish Research CouncilVR-RFI [2019-00191]
- Swedish Foundation for Strategic Research [RIF14-0053]
- USTEM at TU Wien
- Plansee Composite Materi-als GmbH
- TU Wien Bibliothek
- Swedish Research Council [2019-00191] Funding Source: Swedish Research Council
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The phase stability and mechanical properties of multimetal-boronitride (Hf,Ta,Ti,V,Zr)-B-N were investigated using ab initio computations and experimental methods. Non-reactively sputtered (Hf,Ta,Ti,V,Zr)-B-N coatings exhibited a single-phase fcc solid solution with exceptional hardness and thermal stability. The (Hf,Ta,Ti,V,Zr)-B-N preferred the fcc NaCl-type structure up to a B:N ratio of 3.5.
Phase stability and mechanical properties of multimetal-boronnitride (Hf,Ta,Ti,V,Zr)-B-N is investigated by ab initio computations and experimental methods. (Hf,Ta,Ti,V,Zr)-B-N shows a strong energetic preference for the fcc NaCl-type structure over other structures up to a B:N ratio of 3.5. Reactively deposited (Hf,Ta,Ti,V,Zr)-B-N coatings show formation of X-ray amorphous BN, accompanied by a drastic hardness decrease with increasing B content. But non-reactively sputtered (Hf,Ta,Ti,V,Zr)-B-N coatings exhibit a single-phase fcc solid solution, up to the maximum B:N ratio of 1.12 studied, in good agreement with calculations. All non-reactively sputtered multimetal-boronnitride coatings contain a high Zr metal-fraction and approximate to 8at% C, stemming from impurities in the target. The single-phase coatings reach superhardness up to 46.3 GPa. Even after vacuum annealing to 1200 degrees C, the hardness of the coating with a B:N ratio of 1.03 is still 43.7 GPa, while that of ZrN0.72C0.28 decreased from 36.3 to 30.2 GPa. Our results demonstrate the importance of the deposition technique to deposit single-phased coatings with exceptional hardness and thermal stability. (C) 2022 The Authors. Published by Elsevier Ltd.
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