Revealing the Precipitation Sequence with Aging Temperature in a Non-equiatomic AlCoCrFeNi High Entropy Alloy

Revealing the Precipitation Sequence with Aging Temperature in a Non-equiatomic AlCoCrFeNi High Entropy Alloy

Sequential transformation in precipitate structure from L1 2 → B2-NiAl precipitate has been observed for Al 0.5 Co 1.5 CrFeNi 1.5 alloy with the increase in aging temperature. At 650 °C, the FCC matrix contained L1 2 precipitates ( γ ′), which were transformed into ordered B2 structure precipitate a...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2022, Vol.53 (1), p.314-321
Hauptverfasser: Nandal, Vickey, Harun, Bushra, Sarvesha, R., Singh, Sudhanshu S., Huang, E.-Wen, Chang, Yao-Jen, Yeh, An-Chou, Jain, Jayant, Neelakantan, Suresh
Format: Artikel
Sprache:eng
Schlagworte:
Aging
Aging (metallurgy)
B2 structure (crystals)
Characterization and Evaluation of Materials
Chemical precipitation
Chemistry and Materials Science
Heat of transformation
High entropy alloys
Intermetallic compounds
Materials Science
Metallic Materials
Nanotechnology
Nickel aluminides
Nickel base alloys
Nickel compounds
Nucleation
Original Research Article
Precipitates
Structural Materials
Surfaces and Interfaces
Thin Films
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Zusammenfassung:Sequential transformation in precipitate structure from L1 2 → B2-NiAl precipitate has been observed for Al 0.5 Co 1.5 CrFeNi 1.5 alloy with the increase in aging temperature. At 650 °C, the FCC matrix contained L1 2 precipitates ( γ ′), which were transformed into ordered B2 structure precipitate at 750 °C. A coarser and more stable B2-NiAl rich precipitate has been observed for higher aging temperature (850 °C). This transformation is attributed to the higher thermodynamic stability of B2-NiAl precipitates overcoming the nucleation barrier at higher temperatures.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-021-06528-7