https://scholars.lib.ntu.edu.tw/handle/123456789/614653
標題: | Lattice-Distortion-Enhanced Yield Strength in a Refractory High-Entropy Alloy | 作者: | Lee C.; Chou Y.-C. YI-CHIA CHOU |
關鍵字: | Calculations; Entropy; High resolution transmission electron microscopy; Refractory materials; Scanning electron microscopy; Yield stress; Atom probe tomography; Body-centered cubic; Experimental verification; First-principles calculation; Lattice distortions; Scanning transmission electron microscopy; Theoretical modeling; Thermodynamic model; High-entropy alloys | 公開日期: | 2020 | 出版社: | Wiley-VCH Verlag | 卷: | 32 | 期: | 49 | 來源出版物: | Advanced Materials | 摘要: | 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. © 2020 Wiley-VCH GmbH |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85094632679&doi=10.1002%2fadma.202004029&partnerID=40&md5=c0fb4b41fdb124576737416a6dcd216e https://scholars.lib.ntu.edu.tw/handle/123456789/614653 |
ISSN: | 09359648 | 其他識別: | ADVME | DOI: | 10.1002/adma.202004029 |
顯示於: | 材料科學與工程學系 |
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