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UNS R60705 Zirconium-Niobium Alloy

R60705 alloy is a zirconium alloy. Cited properties are appropriate for the annealed condition. It has a moderately low thermal conductivity and a moderately high tensile strength among zirconium alloys.

The graph bars on the material properties cards below compare R60705 alloy to: zirconium alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

98 GPa 14 x 10⁶ psi

Elongation at Break

18 %

Fatigue Strength

290 MPa 42 x 10³ psi

Poisson's Ratio

0.34

Shear Modulus

37 GPa 5.3 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

540 MPa 78 x 10³ psi

Tensile Strength: Yield (Proof)

430 MPa 63 x 10³ psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Specific Heat Capacity

270 J/kg-K 0.064 BTU/lb-°F

Thermal Conductivity

17 W/m-K 9.9 BTU/h-ft-°F

Thermal Expansion

6.3 µm/m-K

Otherwise Unclassified Properties

Density

6.7 g/cm³ 420 lb/ft³

Embodied Water

450 L/kg 54 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

90 MJ/m³

Resilience: Unit (Modulus of Resilience)

950 kJ/m³

Stiffness to Weight: Axial

8.1 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

9.5 mm²/s

Thermal Shock Resistance

63 points

Alloy Composition

Zirconium (Zr)Zr		91 to 98
Niobium (Nb)Nb		2.0 to 3.0
Hafnium (Hf)Hf		0 to 4.5
Chromium (Cr)Cr		0 to 0.2
Iron (Fe)Fe		0 to 0.2
Oxygen (O)O		0 to 0.18
Carbon (C)C		0 to 0.050
Nitrogen (N)N		0 to 0.025
Hydrogen (H)H		0 to 0.0050