Radiation response of multicomponent L12γ′ precipitates strengthened high entropy alloys: The role of γ/γ′ interface

SS Huang and HJ Fu and YX Xiong and WY Lu and SH Ma and XP Xiang and JJ Kai and SJ Zhao, JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, 33, 9289-9296 (2024).

DOI: 10.1016/j.jmrt.2024.11.249

The advancement of high entropy alloys (HEAs) has stimulated the development of multicomponent L1(2 )gamma ' intermetallics, which exhibit both excellent strength and ductility. These intermetallics with long-range order are typically employed as coherent precipitates to enhance the high-temperature performance of HEAs. This study investigates the influence of multicomponent gamma ' intermetallics on the irradiation response of the strengthened HEA gamma phase, focusing on the role of the multicomponent gamma/gamma ' interface in defect production and evolution. Our results indicate that the chemical disorder within the multicomponent gamma ' phase leads to a broad defect energy spectrum near the interface zone, diminishing its effectiveness as a defect sink. Based on these observations, we propose that, distinct from traditional superalloys, the gamma/gamma ' interface plays a minor role in the irradiation resilience of multicomponent gamma ' intermetallics-strengthened HEAs. Instead, the inherent chemical disorder within the multicomponent gamma ' intermetallics emerges as the key factor.

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