Lattice-Distortion-Enhanced Yield Strength in a Refractory High-Entropy Alloy

Lattice-Distortion-Enhanced Yield Strength in a Refractory High-Entropy Alloy

© 2020 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 32(2020), 49 vom: 15. Dez., Seite e2004029
1. Verfasser: Lee, Chanho (VerfasserIn)
Weitere Verfasser: Chou, Yi, Kim, George, Gao, Michael C, An, Ke, Brechtl, Jamieson, Zhang, Chuan, Chen, Wei, Poplawsky, Jonathan D, Song, Gian, Ren, Yang, Chou, Yi-Chia, Liaw, Peter K
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article NbTaTiVZr alloy-design strategies lattice distortion microstructure refractory high-entropy alloys yield strength
Beschreibung
Zusammenfassung:© 2020 Wiley-VCH GmbH.
Severe distortion is one of the four core effects in single-phase high-entropy alloys (HEAs) and contributes significantly to the yield strength. However, the connection between the atomic-scale lattice distortion and macro-scale mechanical properties through experimental verification has yet to be fully achieved, owing to two critical challenges: 1) the difficulty in the development of homogeneous single-phase solid-solution HEAs and 2) the ambiguity in describing the lattice distortion and related measurements and calculations. A single-phase body-centered-cubic (BCC) refractory HEA, NbTaTiVZr, using thermodynamic modeling coupled with experimental verifications, is developed. Compared to the previously developed single-phase NbTaTiV HEA, the NbTaTiVZr HEA shows a higher yield strength and comparable plasticity. The increase in yield strength is systematically and quantitatively studied in terms of lattice distortion using a theoretical model, first-principles calculations, synchrotron X-ray/neutron diffraction, atom-probe tomography, and scanning transmission electron microscopy techniques. These results demonstrate that severe lattice distortion is a core factor for developing high strengths in refractory HEAs
Beschreibung:Date Revised 22.02.2021
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202004029