[T14] High Temperature Materials

[16P-T14-08] Microstructural Evolutions of Molybdenum-rhenium (47.5 wt.%) Alloy Under Room and High Temperature Compressions

*W. Zhang¹, H. Xu², L. Huang¹ (1.Northwest Institute for Nonferrous Metal Research, China, 2.Xi'an Jiao Tong University, China)

Keywords:Mo-47.5Re alloy, Microstructural stability, Rate-dependent, Compressive properties, Deformation twins

Molybdenum-rhenium alloys possess excellent mechanical properties at a wide temperature range Compressions at varied temperatures and strain rates were given to study the microstructural evolutions of Mo-47.5Re alloy. Yield strength is similar in sample compressed at 400 ℃ with high strain rate (1.67×10-1 /s) and the one at room temperature with low strain rate (1.67×10-3 /s). However, deformation twins are only observed under room temperature and are absent as temperature rises to 400 ℃. 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 ℃. Although sub-grains increasing after 1200 ℃ compressions, no recrystallization was detected. In addition, microstructural evolutions of Mo-47.5Re are outstandingly dependent on strain rates at 400 ℃, while are much less obviously at 800 ℃ and 1200 ℃. No phase changes are detected, which verifies good structural stability in Mo-47.5Re.