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  Towards superior high temperature properties in low density ferritic AlCrFeNiTi compositionally complex alloys

Wolff-Goodrich, S., Haas, S., Glatzel, U., & Liebscher, C. (2021). Towards superior high temperature properties in low density ferritic AlCrFeNiTi compositionally complex alloys. Acta Materialia, 216: 117113. doi:10.1016/j.actamat.2021.117113.

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Wolff-Goodrich, Silas1, Author              
Haas, Sebastian2, Author
Glatzel, Uwe2, Author
Liebscher, Christian1, Author              
Affiliations:
1Advanced Transmission Electron Microscopy, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863399              
2Univ. Bayreuth, TAO Gebaude, Lehrstuhl Metall Werkstoffe, Prof Rudiger Bormann Str 1, D-95447 Bayreuth, Germany, ou_persistent22              

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 Abstract: Three novel precipitation strengthened bcc alloys which exhibit a smooth microstructural gradient with composition have been fabricated in bulk form by induction casting. All three alloys are comprised of a mixture of disordered A2-(Fe, Cr) and L2(1)-ordered (Ni, Fe)(2)AlTi type phases both as-cast and after long-term annealing at 900 degrees C. The ratio of disordered to ordered phase, primary dendrite fraction, and overall microstructural coarseness all decrease as Cr is replaced by Al and Ti. Differences in phase composition are quantified through domain averaged principal component analysis of energy dispersive spectroscopy data obtained during scanning transmission electron microscopy. Bulk tensile testing reveals retained strengths of nearly 250 MPa up to 900 degrees C for the alloys which contain a nanoscale maze-like arrangement of ordered and disordered phases. One alloy, containing a duplex microstructure with ductile dendritic regions and highly creep resistant interdendritic regions, shows a promising balance between high temperature ductility and strength. For this alloy, tension creep testing was carried out at 700, 750, and 800 degrees C for a broad range of loading conditions and revealed upper bound creep rates which surpass similar ferritic superalloys and rival those of several conventionally employed high temperature structural alloys, including Inconel 617 and 718, at much lower density and raw material cost. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2021-09-01
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.actamat.2021.117113
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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 216 Sequence Number: 117113 Start / End Page: - Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100