About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
|
Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
Tensile Creep Behavior of NiCoCr and ODS-NiCoCr Multi-principal Element Alloys |
Author(s) |
Gianmarco Sahragard-Monfared, Timothy M. Smith, Jeffery C. Gibeling |
On-Site Speaker (Planned) |
Gianmarco Sahragard-Monfared |
Abstract Scope |
Multi-principal element alloys (MPEA) have been proven to exhibit excellent room temperature and cryogenic strength and ductility. However, MPEAs with an FCC crystal processed by arc melting generally exhibit low strengths at elevated temperatures. Alternative manufacturing processes provide an opportunity to introduce dispersoids into the matrix to improve high temperature properties. In this study the influence of oxide dispersion strengthening (ODS) on the creep behavior of an MPEA produced by additive manufacturing (AM) is investigated. AM-NiCoCr and an oxide dispersion strengthened variant containing one weight percent yttria (ODS-NiCoCr) were creep tested at 973-1173K. Stress exponents and activation energies determined from these tests highlight the differences in deformation mechanisms of these MPEAs. Transmission electron microscopy of specimens crept to steady state was used to characterize the morphology of dislocations and their interactions with other dislocations and dispersoids. These results were compared to recent creep results for a CrMnFeCoNi MPEA. |
Proceedings Inclusion? |
Undecided |