Microstructure and mechanical properties of a low activation cast WTaHfTiZr refractory high-entropy alloy

In the face of 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 low activation, high melting point thermostability. alloys prepared by arc melting. as-cast alloy shows dendrite microstructure with two disordered BCC phases, which caused preferential nucleation W Ta much higher points during solidification. It exhibits compressive yield strength 1,900 MPa fracture strain 8.1% at room temperature, its strengths are up to 612 700 °C 203 1,000 °C, respectively. attributed mainly solid solution strengthening second phase strengthening. This great promise as one next-generation materials.