Molybdenum-Rhenium Alloy

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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.