Molybdenum-Rhenium Alloy
PHYSICAL AND THERMAL PROPERTIES:
Density at 20 oC: 13.70 (gm/cm3) 0.494 (lb/ln3)
Melting Point: 2550 oC4620 oF
Vapor Pressure (mm Hg)*:
1525 oC:
2000 oC:
2500 oC:
3000 oC:
*Initial behavior similar to that of molybdenum.
Linear Coefficient of Thermal Expansion:
500 oC:5.72
1000 oC:6.45
2000 oC:7.76
Thermal Conductivity:
10 oC:0.366 200 oC: 0.445 300 oC:0.480
500 oC:0.532 700 oC: 0.5841000 oC: 0.640
1200 oC:0.6601500 oC: 0.6901800 oC:0.710
MECHANICAL PROPERTIES:
Ductile-to-Brittle Transition Temperature (Recrystallized): Below 254 oC
Recrystallization Temperature (*1 hr): 1300-1550 oC
Stress-Relieving Temperature: 1000-1200 oC
Workability: In both stress-relieved and recrystallized conditions far surpasses pure molybdenum. Works warm or cold. High yield strength requires 500-700 oC for certain fabricating operations.
Weldability: Use same procedures as those for pure rhenium. Fusion weldability is outstanding and nearly as good as that of pure rhenium.
Machinability: Use conventional machining methods. Alloy particulary suited to EDM and to abrasive machining with silicon carbide and aluminum oxide wheels. Constant movement, light pressure, and flood cooling recommended.