| Autor: |
Süzer, İlayda, Ates, Semih, Akbari, Amir, Mertdinç-Ülküseven, Sıddıka, Gürcan Bayrak, Kübra, Aysel, Esin, Ayas, Erhan, Arisoy, C. Fahir, Öveçoğlu, M.Lütfi, Ağaoğulları, Duygu |
| Zdroj: |
Journal of Materials Research and Technology; 20230101, Issue: Preprints |
| Abstrakt: |
This study explains the synthesis mechanism of (HfTiZrMnCr)B2high entropy diboride ceramics prepared via a combined route consisting of ball milling and spark plasma sintering. Firstly, metal borides were in-house synthesized using mechanochemical synthesis and leaching processes under optimum conditions from metal oxides, B2O3and Mg precursors. The (HfTiZr)B2composition, chosen as the main composition, was hybridized with two different methods: planetary and vibratory ball milling. As a result of milling experiments, 6 h vibratory milling was determined as the optimum duration, and all compositions were produced by spark plasma sintering method (2000 °C, 30 MPa) following this optimum condition. Different compositions were used to see which one of the HfB2, TiB2, ZrB2compounds acted as host material. Based on the phase analyses, single-phase HEB structures, Ti-rich phases and Hf, Ti, Zr-oxides were observed in the microstructure. Detailed physical, microstructural, mechanical and termal characterizations were performed: the highest hardness values were observed in the (HfTiMnCr)B2and (HfTiZrMnCr)B2samples as ∼ 27 GPa, the lowest wear rate was recorded for the (HfTiZrMnCr)B2sample as ∼2 × 10−6Nm/mm3, and the highest oxidation resistance was achieved at the (HfZrMnCr)B2and (HfTiMnCr)B2samples as weight gains ∼ 1.90%. |
| Databáze: |
Supplemental Index |
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