Dual HCP structures formed in senary ScYLaTiZrHf multi-principal-element alloy
| Autor: | Akira Takeuchi, Takeshi Wada, Kenji Amiya, Kunio Yubuta |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Diffraction Materials science Mechanical Engineering High entropy alloys Alloy Enthalpy Metals and Alloys 02 engineering and technology General Chemistry engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Crystallography Mechanics of Materials 0103 physical sciences Materials Chemistry engineering 0210 nano-technology Senary Solid solution Phase diagram |
| Zdroj: | Intermetallics. 69:103-109 |
| ISSN: | 0966-9795 |
| DOI: | 10.1016/j.intermet.2015.10.022 |
| Popis: | A senary ScYLaTiZrHf alloy was investigated for its ability to form a solid solution with an hcp structure, also known as a high-entropy alloy (HEA). X-ray diffraction analysis of the ScYLaTiZrHf alloy produced by arc-melting method confirmed this hcp structure. The microstructure of the ScYLaTiZrHf was composed of dual phases that were enriched in (Y, La) or (Ti, Zr, Hf), with Sc distributed evenly across both phases. The positive mixing enthalpy of 11.4 kJ mol−1 derived from Miedema's model, and the immiscible tendencies of its constituent binary phase diagrams help to explain the presence of dual phases in the ScYLaTiZrHf alloy. When formed into dual hcp solid solutions, the ScYLaTiZrHf alloy can be more accurately described as a multi-principal-element alloy (MPEA) rather than as a HEA, since the ScYLaTiZrHf alloy is a solid solution that is enthalpy-driven instead of entropy driven. The results also disclosed another procedure to stabilize solid solutions excepting for high-entropy scheme. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect