期刊
SCRIPTA MATERIALIA
卷 200, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113909
关键词
Eutectic composite; Refractory high-entropy alloys; Carbide; Mechanical properties
类别
资金
- State Key Program of National Natural Science Foundation of China [51932006]
- National Natural Science Foundation of China [52001120]
- Fundamental Research Funds for the Central Universities [531118010450]
- Hundred Talent Program of Hunan Province
In this study, a high strength-ductile matching Re0.5MoNbW(TaC)(0.8) eutectic high-entropy composite was fabricated and demonstrated excellent mechanical properties that exceed previously reported refractory high-entropy alloys and HECs. The study suggests a strategy to design strong and ductile HECs for high-temperature applications.
Refractory high-entropy alloys are promising high-temperature materials owing to their excellent softening resistance. However, most RHEAs that can withstand softening at 1200 degrees C usually suffer from apparent brittleness at room temperature. Here, a high strength-ductile matching Re0.5MoNbW(TaC)(0.8) eutectic high-entropy composite (HEC) consisting of body-centered-cubic and multi-component carbide phases was fabricated by arc melting. The HEC exhibits a high yield strength (1340 MPa), ultimate compressive strength (2347 MPa) and plasticity (8.90 %), which exceeds those of previously reported RHEAs and HECs. Quantitative calculations based on experimental observations suggest that semi-coherent phase interface plays an essential role for strength enhancement, and interfacial dependent strengthening dominates among the interface strengthening terms. Our study envisages a strategy to design strong and ductile HECs aiming at high-temperature applications. (C) 2021 Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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