| 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： | ||
| Abstract： |
In the face of the requirement that nuclear fusion reactor materials exhibit more excellent thermal, mechanical and physical properties, a novel refractory highentropy 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.
|
