Microstructural Evolutions of Molybdenum‑rhenium (47.5 Wt.%) Alloy under Room and High Temperature Compressions

Act as a candidate for heat pipe reactor core, molybdenum-rhenium (47.5 wt%) alloy possesses excellent mechanical properties at a wide temperature range (from room temperature to recrystallized temperature). Compressions at varied temperatures and strain rates were given to study the microstructural evolutions of Mo47.5Re alloy. Yield strength is similar in sample compressed at 400 degrees C with high strain rate (1.67 x 10-1 /s) and the one at room temperature with low strain rate (1.67 x 10-3 /s). However, deformation twins are only observed under room temperature and are absent as temperature rises to 400 degrees C. Thus. Twinning in Mo-Re alloy is much sensitive to temperature. The microstructure of Mo-47.5Re alloy is quite stable even compression at 1200 degrees C. Although sub-grains increasing after 1200 degrees C compressions, no recrystallization was detected. In addition, microstructural evolutions of Mo-47.5Re are outstandingly dependent on strain rates at 400 degrees C, while are much less obviously at 800 degrees C and 1200 degrees C. No phase changes are detected, which verifies good structural stability in Mo-47.5Re.