| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
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Emergent Materials under Extremes and Decisive In Situ Characterizations
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| Presentation Title |
Novel Refractory High-Entropy Metal-Ceramic Composites with Superior Mechanical Properties |
| Author(s) |
Bai Cui, Xin Chen, Fei Wang, Xiang Zhang, Shanshan Hu, Xingbo Liu, Samuel Humphry-Baker, Michael Gao, Lingfeng He, Yongfeng Lu |
| On-Site Speaker (Planned) |
Bai Cui |
| Abstract Scope |
A new concept of refractory high-entropy metal-ceramic composites (HEMCC) has been proposed that combines the outstanding physical properties of both refractory high-entropy alloy (HEA) and high-entropy ceramic (HEC). As the first HEMCC system, to the best of our knowledge, TiTaNbZr-(TiTaNbZr)C, has been developed by a powder metallurgy process. Both the HEA and HEC phases with non-equimolar compositions exhibit body-centered cubic (BCC) and rock-salt B1 crystal structures, respectively, and both have non-equimolar compositions. With the increase of the HEC phase in HEMCC, the hardness is enhanced while the density and fracture toughness are decreased. HEA50C shows a favorable combination of flexural strength and fracture toughness at room temperature and a high compressive strength at 1300 ºC. The optimized mechanical performance of HEMCC might be attributed to the combination of the ductile HEA and strong HEC phases, smaller grain size, and crack trapping at HEC/HEA interfaces. |