Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 53, Issue 1, Pages 314-321Publisher
SPRINGER
DOI: 10.1007/s11661-021-06528-7
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Sequential transformation of precipitate structure from L1(2) to B2-NiAl has been observed in Al0.5Co1.5CrFeNi1.5 alloy with increasing aging temperature. A coarser and more stable B2-NiAl rich precipitate is formed at higher aging temperatures (850 degrees C) due to the higher thermodynamic stability of B2-NiAl precipitates.
Sequential transformation in precipitate structure from L1(2) -> B2-NiAl precipitate has been observed for Al0.5Co1.5CrFeNi1.5 alloy with the increase in aging temperature. At 650 degrees C, the FCC matrix contained L1(2) precipitates (gamma '), which were transformed into ordered B2 structure precipitate at 750 degrees C. A coarser and more stable B2-NiAl rich precipitate has been observed for higher aging temperature (850 degrees C). This transformation is attributed to the higher thermodynamic stability of B2-NiAl precipitates overcoming the nucleation barrier at higher temperatures.
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