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Crystallographic ordering in a series of Al-containing refractory high entropy alloys Ta-Nb-Mo-Cr-Ti-Al

Chen, H. 1; Kauffmann, A. 1; Seils, S. 1,2; Boll, T. ORCID iD icon 1,2; Liebscher, C. H.; Harding, I.; Kumar, K. S.; Szabo, D. V. ORCID iD icon 1,2; Schlabach, S. ORCID iD icon 1,2; Kauffmann-Weiss, S. 3; Müller, F.; Gorr, B.; Christ, H.-J.; Heilmaier, M. 1
1 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)
3 Institut für Technische Physik (ITEP)


High entropy alloys based on the Ta–Nb–Mo–Cr–Ti–Al system are expected to possess high creep and oxidation resistance as well as outstanding specific mechanical properties due to presumed high melting points and low densities. However, we recently reported that arc-melted and subsequently homogenized alloys within this system exhibit a lack of ductility up to 600 °C [H. Chen et al. in Metall. Mater. Trans. A 49 (2018) 772–781 and J. Alloys Cmpd. 661 (2016) 206–215]. Thermodynamic calculations suggest the formation of a B2-type ordered phase below the homogenization temperature. In the present article, we provide results of a detailed microstructural characterization of a series of Ta–Nb–Mo–Cr–Ti–Al derivatives and evaluate if B2-type ordering could be the origin for the observed lack of ductility. Backscatter electron (BSE) imaging, energy dispersive X-ray spectroscopy (EDX) and atom probe tomography (APT) were used to verify uniform elemental distribution after homogenization. X-ray diffraction (XRD) patterns indicate both, A2 or B2-type crystal structure, whereas transmission electron microscopy (TEM) diffraction experiments unambiguously confirm B2-type order in the as-homogenized state of all investigated alloys. ... mehr

Preprint §
DOI: 10.5445/IR/1000096283
Veröffentlicht am 10.07.2019
DOI: 10.1016/j.actamat.2019.07.001
Zitationen: 53
Web of Science
Zitationen: 48
Zitationen: 62
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Karlsruhe Nano Micro Facility (KNMF)
Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2019
Sprache Englisch
Identifikator ISSN: 1359-6454
KITopen-ID: 1000096283
HGF-Programm 34.13.02 (POF III, LK 01) Portfolio Material zukünftige Energief.
Weitere HGF-Programme 49.02.08 (POF III, LK 02) Atom probe tomography
Erschienen in Acta materialia
Verlag Elsevier
Band 176
Seiten 123-133
Vorab online veröffentlicht am 03.07.2019
Schlagwörter KNMF PROPOSAL 2015-015-008752 APT FIB
Nachgewiesen in Dimensions
Web of Science
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