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Improving the intermediate- and high-temperature strength of L12-Co3(Al,W) by Ni and Ta additions

Chen, Zhenghao ; Kishida, Kyosuke; Inui, Haruyuki; Heilmaier, Martin 1; Glatzel, Uwe; Eggeler, Gunther
1 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)

Abstract:

The effects of Ni and Ta additions on the mechanical properties in the L12 compound Co3(Al,W), the strengthening phase of Co-based superalloys, have been investigated by compression tests between room temperature and 1000 °C, in order to elucidate the effects of stability of the L12 phase on the mechanical properties. The additions of Ni and Ta, both of which are L12-stabilizers that increase the L12 solvus temperature, increase the yield strength at intermediate and high temperatures. The strength increase is shown to be more significant as the amount of additions of these elements and thereby the stability of the L12 phase increases. Two factors account for the strength increase at intermediate temperatures: The reduction of the onset temperature of yield stress anomaly (YSA-onset) due to the increased complex stacking fault (CSF) energy and the increase in both the base strength and the intensity of the yield stress anomaly associated with an increased anti-phase boundary (APB) energy on (111) planes. The strength increase at high temperatures, on the other hand, arises from the increase in the peak temperature due to the increased L12 solvus temperatures. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2022
Sprache Englisch
Identifikator ISSN: 1359-6454, 1873-2453
KITopen-ID: 1000150394
HGF-Programm 38.04.01 (POF IV, LK 01) Gas turbines
Erschienen in Acta Materialia
Verlag Elsevier
Band 238
Seiten Art.-Nr.: 118224
Nachgewiesen in Scopus
Dimensions
Web of Science

Verlagsausgabe §
DOI: 10.5445/IR/1000150394
Veröffentlicht am 08.09.2022
Originalveröffentlichung
DOI: 10.1016/j.actamat.2022.118224
Scopus
Zitationen: 12
Web of Science
Zitationen: 8
Dimensions
Zitationen: 11
Seitenaufrufe: 116
seit 11.09.2022
Downloads: 70
seit 22.09.2022
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