|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X
||Mechanisms of Creep in NiCoCr and ODS-NiCoCr Multi-Principal Element Alloys
||Gianmarco Sahragard-Monfared, Timothy Smith, Jeffery Gibeling
|On-Site Speaker (Planned)
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 steady state and constant structure creep behavior of an MPEA produced by additive manufacturing (AM) is investigated. Constant stress and stress reduction creep tests were performed on AM-NiCoCr and an oxide dispersion strengthened variant containing one weight percent yttria (ODS-NiCoCr). Activation areas determined from the latter tests highlight the rate controlling mechanisms of these MPEAs. Transmission electron microscopy of specimens crept to various strains are used to characterize the evolving morphology of dislocations and their interactions with other dislocations and the dispersoids.
||High-Entropy Alloys, Additive Manufacturing, Mechanical Properties