High-temperature mechanical properties and dynamic recrystallization of Mo-14Re alloy

The Mo-14Re alloy is currently utilized as a candidate structural material in space nuclear reactors and exhibits significant potential in other high-temperature fields. However, due to the high cost of rhenium, limited research has been conducted on the high-temperature properties of Mo-14Re. This study aims to investigate the high-temperature tensile properties of the stress-relieved Mo-14Re within the temperature range of 1200 K to 1773 K, specifically focusing on the microstructure of dynamically recrystallized grains and their influence on high-temperature deformation. The results demonstrate that the ultimate tensile strength of Mo-14Re reaches 399 MPa, 358 MPa, 311 MPa, and 33 MPa at 1200 K, 1350 K, 1500 K, and 1773 K, respectively. Above 1350 K, the softening caused by dynamic recovery and dynamic recrystallization becomes more pronounced, surpassing the influence of work hardening on high-temperature deformation. Continuous dynamic recrystallization is identified as the primary mechanism driving the dynamic recrystallization. Moreover, a new texture emerges when Mo-14Re undergoes dynamic recrystallization above 1500 K. Notably, no precipitated phases or element segregation are observed in Mo-14Re following high-temperature deformation.