The present work investigates the tensile deformation behavior and fracture mechanism of Mo-14 %Re alloy (MR14) at both room and high temperatures. The results show that the tensile strength of MR14 alloy is 613 MPa at room temperature and 260 MPa at 1000 °C. Moreover, the MR14 exhibits remarkable ductility, with elongation surpassing 60 % both at ambient temperature and elevated temperatures. As the temperature rises, dynamic recrystallization and the rotation of subgrains lead to the evolution of texture during fracture, which has not been reported hitherto. A high proportion of low-angle grain boundaries (LAGBs) facilitates the dislocation transfer, thereby preventing the nucleation of cracks caused by stress concentration. The strong texture, abundant substructure, movable edge dislocation and mixed dislocation on the bundle structures are the main toughening factors. Additionally, during the high-temperature tensile deformation process, the MR14 alloy maintains a single-phase structure without precipitation, demonstrating excellent thermal stability. These research findings hold profound significance for broadening the application scope of the MoRe alloy.

中文翻译：

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Mo-14 %Re合金在室温和高温下的拉伸行为和微观组织演变


本工作研究了 Mo-14 %Re 合金 （MR14） 在室温和高温下的拉伸变形行为和断裂机理。结果表明，MR14合金在室温下的抗拉强度为613 MPa，在1000 °C时为260 MPa。 此外，MR14 表现出卓越的延展性，在环境温度和高温下伸长率均超过 60%。随着温度的升高，动态再结晶和亚晶粒的旋转导致断裂过程中织构的演变，这是迄今为止尚未报道的。高比例的小角度晶界 （LAGBs） 促进了位错转移，从而防止了应力集中引起的裂纹成核。束状结构上较强的织构、丰富的子结构、可动的边缘位错和混合位错是主要的增韧因素。此外，在高温拉伸变形过程中，MR14 合金保持单相结构无沉淀，表现出优异的热稳定性。这些研究成果对于拓宽 MoRe 合金的应用范围具有深远的意义。