|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||Radiation-induced Segregation in Ni-based Concentrated Solid Solution Alloys
||Mo-Rigen He, Shuai Wang, Shi Shi, Ke Jin, Hongbin Bei, Kazuhiro Yasuda, Syo Matsumura, Kenji Higashida, Ian Robertson
|On-Site Speaker (Planned)
Single-phase concentrated solid solution alloys provide a fundamentally new avenue to enhance radiation damage tolerance by the increase of compositional complexity. However, less has been understood about the evolution of local chemical state in these materials as induced by irradiation. Here we present the defect microstructure and compositional profile in a series of Ni-based concentrated solid solution alloys (NiFe, NiCoCr, NiCoFeCr, and NiCoFeCrPd) under 1250 kV electron irradiation (at 400 °C, up to 1 dpa). All defects are interstitial-type, either Frank loops or perfect loops. Ni/Co segregates, while Fe/Cr (for all materials but NiFeCoCrPd) or Pd depletes at the loop plane. Moreover, the irradiated matrix of NiCoFeCrPd shows a three-dimensional modulated microstructure coupled with a decomposition between Ni/Co and Pd along <001> directions. These effects will be associated with the modification of energy dissipation processes and defect formation and migration energies, and contribute to the enhancement of radiation damage tolerance.
||Planned: Supplemental Proceedings volume