A promising new class of irradiation tolerant materials:Ti₂ZrHfV_0.5Mo_0.2 high-entropy alloy

Yiping Lu¹£¬Hefei Huang²£¬Xuzhou Gao³£¬Cuilan Ren²£¬Jie Gao²£¬Huanzhi Zhang¹£¬Shijian Zheng⁴£¬Qianqian Jin⁴£¬Yonghao Zhao³£¬Chenyang Lu⁵£¬Tongmin Wang¹£¬Tingju Li¹

1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences (CAS)3. School of Materials Science and Engineering, Nanjing University of Science and Technology4. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences5. Department of Nuclear Engineering and Radiological Sciences, University of Michigan

Õª Òª£ºRecently, high-entropy alloys£¨HEAs£© or multi-principal-element alloys with unprecedented physical,chemical, and mechanical properties, have been considered as candidate materials used in advanced reactors due to their promising irradiation resistant behavior. Here, we report a new single-phase bodycentered cubic£¨BCC£© structured Ti₂ ZrHfV_0.5Mo_0.2 HEA possessing excellent irradiation resistance, i.e.,scarcely irradiation hardening and abnormal lattice constant reduction after helium-ion irradiation,which is completely different from conventional alloys. This is the first time to report the abnormal XRD phenomenon of metallic alloys and almost no hardening after irradiation. These excellent properties make it to be a potential candidate material used as core components in next-generation nuclear reactors. The particular irradiation tolerance derives from high density lattice vacancies/defects.

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