| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
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High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
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| Presentation Title |
E-7: A Superb Mechanical Behavior of Newly Developed Lightweight and Ductile Al0.5Ti2Nb1Zr1Wx Refractory High Entropy Alloy via Nanoprecipitates and Dislocations Induced-Deformation |
| Author(s) |
Muhammad Abubaker Khan, M. Hamza, Mohamed A. Afifi, Wei-Bing Liao |
| On-Site Speaker (Planned) |
Muhammad Abubaker Khan |
| Abstract Scope |
In this study, the newly designed lightweight (6.2 g/cm3) Al0.5Ti2Nb1Zr1WX (X: 0, 0.3, 0.5, 0.7) RHEAs were prepared. Our results evidence that the microstructure of RHEA has a BCC structure merged with B2 nano-precipitates, which leads to significant improvement in the specific yield-strength (SYS) compared with other RHEAs. Besides, the compressive SYS of RHEA at 298 K, 973 K, and 1078 K are as high as 187 MPa g-1 cm3, 128 MPa g-1 cm3, and 95 MPa g-1 cm3, respectively. Interestingly, RHEA exhibited excellent ductility (~ 68 %) at temperatures from 298 K to 1273 K. The distinct deformation mechanisms at 973 K and 1273 K are discussed. The strain hardening capability is provided by dislocation dominated-deformation. Conversely, with an increase in the strain, Micro-crack formation and dynamic-recovery (DRX) cause strain-hardening to become persistent flow softening at 1273 K due to diffusion-controlled dislocation annihilation and continuous-DRX (CDRX). |