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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
Presentation Title Temperature Dependence of Helium Cavity Behavior in Ion-irradiated Ductile-phase-toughened Tungsten
Author(s) Weilin Jiang, James V. Haag, Di Chen, Libor Kovarik, Karen Kruska, Dalong Zhang, Zhihan Hu, Lin Shao, Wahyu Setyawan
On-Site Speaker (Planned) Weilin Jiang
Abstract Scope Compared to brittle tungsten, ductile-phase-toughened tungsten (DPT W) composites are found to possess significantly improved mechanical properties. These materials have been investigated for potential applications in the plasma-facing components of fusion reactors. The DPT W in this study consists of W particles embedded in a ductile-phase NiFeW matrix. Sequential irradiation with self- (Ni<sup>+</sup>) and He<sup>+</sup> ions was performed at room temperature (RT), 700 and 1000°C. The irradiated samples have been characterized using microscopic and spectroscopic methods. While He cavities are not visible in RT-irradiated DPT W, they appear in NiFeW and W as well as aggregate preferentially along the NiFeW/W boundaries during ion irradiation at elevated temperatures. A quantitative analysis of the cavity dimension, number density, He density and pressure in the nanometer-sized cavities has been performed. The results will be reported and the mechanisms for the temperature dependence will be discussed. Further investigation plans will also be outlined.
Proceedings Inclusion? Planned:
Keywords Nuclear Materials, Characterization, Mechanical Properties

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