The origin and control of interstitial impurities in refractory complex concentrated alloys
Belcher, Calvin H. ; Kamp, Daisy; To, Sydney; Lu, Yemao
1,2; Chassaing, Delphine 3; Boll, Torben
2,4; MacDonald, Benjamin E.; Lee, Elizabeth M. Y.; Apelian, Diran; Lavernia, Enrique J.
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)
3 Karlsruher Institut für Technologie (KIT)
4 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
1,2; Chassaing, Delphine 3; Boll, Torben
2,4; MacDonald, Benjamin E.; Lee, Elizabeth M. Y.; Apelian, Diran; Lavernia, Enrique J.1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)
3 Karlsruher Institut für Technologie (KIT)
4 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
Abstract:
Interstitial impurities, primarily O and N, inadvertently introduced during the processing of refractory complex
concentrated alloys (RCCAs) significantly limit the mechanical properties of the alloys at room temperature.
Plasma arc melting (PAM) has facilitated the quest for RCCAs, showcasing remarkable combinations of strength
and ductility. In this work, the composition and chemistry of residual gases in the PAM chamber environment
during arc melting and the interstitial impurities in elemental feedstocks were analyzed to quantify the origin of
O and N during synthesis. Moreover, the thermodynamic mechanisms governing the origin of interstitial im-
purities in arc-melted MoNbTaW RCCAs were discussed. With an understanding of the mechanisms governing
the content of interstitial impurities in RCCAs during PAM, arc-melted MoNbTaW RCCAs with fewer than
100 ppm O were synthesized. The arc-melted MoNbTaW RCCAs were then characterized using electron mi-
croscopy and atom probe tomography to establish the compositional architecture of grain boundaries and
thereby elucidate the thermodynamic drive for segregation and oxide formation in MoNbTaW. ... mehr
concentrated alloys (RCCAs) significantly limit the mechanical properties of the alloys at room temperature.
Plasma arc melting (PAM) has facilitated the quest for RCCAs, showcasing remarkable combinations of strength
and ductility. In this work, the composition and chemistry of residual gases in the PAM chamber environment
during arc melting and the interstitial impurities in elemental feedstocks were analyzed to quantify the origin of
O and N during synthesis. Moreover, the thermodynamic mechanisms governing the origin of interstitial im-
purities in arc-melted MoNbTaW RCCAs were discussed. With an understanding of the mechanisms governing
the content of interstitial impurities in RCCAs during PAM, arc-melted MoNbTaW RCCAs with fewer than
100 ppm O were synthesized. The arc-melted MoNbTaW RCCAs were then characterized using electron mi-
croscopy and atom probe tomography to establish the compositional architecture of grain boundaries and
thereby elucidate the thermodynamic drive for segregation and oxide formation in MoNbTaW. ... mehr
| Zugehörige Institution(en) am KIT | Institut für Nanotechnologie (INT) Karlsruhe Nano Micro Facility (KNMF) Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK) |
| Publikationstyp | Zeitschriftenaufsatz |
| Publikationsmonat/-jahr | 01.2025 |
| Sprache | Englisch |
| Identifikator | ISSN: 0925-8388, 1873-4669 KITopen-ID: 1000177164 |
| HGF-Programm | 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture |
| Erschienen in | Journal of Alloys and Compounds |
| Verlag | Elsevier |
| Band | 1010 |
| Seiten | 177520 |
| Schlagwörter | APT, FIB, 2023-030-031766 |
| Nachgewiesen in | Scopus Dimensions OpenAlex Web of Science |