Title: | Microstructure and mechanical properties of a low activation cast WTaHfTiZr refractory high-entropy alloy | |
Author: | Xian-neng Ma1, Yi-fei Hu1, **Kai Wang2, 3, Hai-long Zhang4, Zi-tian Fan1, Jin-ping Suo1, and *Xin-wang Liu1 | |
Address: | 1. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 2. Dekai Intelligent Casting Co., Ltd., Zhuozhou 072750, Hebei, China 3. China Iron and Steel Research Institute Group, Beijing 100081, China; 4. AECC South Industry Company Limited, Zhuzhou 412002, Hunan, China | |
Key words: | refractory high-entropy alloy; phase structure; microstructure; mechanical properties | |
CLC Nmuber: | TG146 | |
Document Code: | A | |
Article ID: | 1672-6421(2022)06-489-06 | |
Abstract: |
In the face of the requirement that nuclear fusion reactor materials exhibit more excellent thermal, mechanical and physical properties, a novel refractory high-entropy alloy, WTaHfTiZr was proposed. The constituent elements were selected in consideration of low activation, high melting point and high thermostability. The alloys were prepared by arc melting. The as-cast alloy shows a dendrite microstructure with two disordered BCC phases, which caused by the preferential nucleation of W and Ta with much higher melting points during solidification. It exhibits a high compressive yield strength of 1,900 MPa and fracture strain of 8.1% at room temperature, and its yield strengths are up to 612 MPa at 700 °C and 203 MPa at 1,000 °C, respectively. The high strengths are attributed mainly to solid solution strengthening and second phase strengthening. This alloy shows great promise as one of the next-generation nuclear fusion reactor materials.
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