期刊
MATERIALS LETTERS
卷 302, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.matlet.2021.130368
关键词
High-entropy alloys; Severe plastic deformation; High-pressure torsion; Ultrafine-grained materials; Nanostructured alloys
资金
- MEXT, Japan [19H05176, 21H00150]
- Grants-in-Aid for Scientific Research [19H05176, 21H00150] Funding Source: KAKEN
By introducing an FCC carbide into a BCC-based AlTiFeCoNi alloy with the assistance of CALPHAD thermodynamic calculations, an ultrahard HEA was produced and processed through severe plastic deformation via the high-pressure torsion method, resulting in nanograin formation, dislocation accumulation, carbide fragmentation, L21 -> BCC ordered-to-disordered phase transformation, and achieving an ultrahigh hardness of 950 Hv.
Mechanical properties of high-entropy alloys (HEAs) have received significant attention, while there are still attempts to find new strategies to further improve their properties. In this study, to produce an ultrahard HEA, an FCC carbide was introduced in a BCC-based AlTiFeCoNi alloy by the assistance of CALPHAD thermodynamic calculations. The alloy was synthesized by arc melting and processed by severe plastic deformation via the highpressure torsion (HPT) method to generate defects. The material showed nanograin formation, dislocation accumulation, carbide fragmentation, L21 -> BCC ordered-to-disordered phase transformation, and accordingly an ultrahigh hardness of 950 Hv after HPT processing.
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