Government of the United States of America - Pacific Northwest National Laboratory; Government of the United States of America - Materials Science and Technology Division
Abstract
Recently, compositionally complex alloys (CCAs) have been proposed as material candidates for extreme environments, such as for fission or fusion. To explore low activation designed W-Ti-based CCA systems, two new nanocrystalline CCA thin films were synthesized. Single-phase BCC ternary W–Ti–V and quaternary W–Ti–Cr–V CCAs were subjected to in-situ heating and dual-beam ion irradiation investigations at 900 °C. After exposure to 900 °C with and without ion irradiation both systems exhibited negligible grain growth. Small (≤ 1 nm) cavities distributed throughout the film were observed with no radiation induced loop formation post dual-beam ion irradiation up to ~13 dpa. These responses are in excellent agreement with atomistic modeling. Compared to other candidate material systems, these systems possess impressive thermal stabilities and irradiation resistances, while serving as low activation alternatives to W–Ta–based compositionally complex alloys for extreme environments.
Keywords: Medium Entropy Alloys, Thin Films, in-situ TEM, thermal stability, He Cavities
Supakul, Skye and Aydogan, Eda and Robin, Ishtiaque and Sun, Bochuan and Yano, Kayla and Tripathi, Shalini and Haag, Jacob and Chen, Wei-Ying and Derby, Benjamin and Velazquez, Daniel and Tsurkan, Sergey and Thoma, Dan J. and Martinez, Enrique and El-Atwani, Osman, Outstanding Ion Irradiation Resistance of Nanocrystalline Low Activation W-Ti-Based Compositionally Complex Alloys. Available at SSRN: https://ssrn.com/abstract=5240158 or http://dx.doi.org/10.2139/ssrn.5240158
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