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UNS R60901 Zirconium-Niobium Alloy

R60901 alloy is a zirconium alloy. It has a moderately low thermal conductivity among the zirconium alloys in the database.

The properties of R60901 alloy include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare R60901 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

17 to 22 %

Poisson's Ratio


Shear Modulus

37 GPa 5.3 x 106 psi

Tensile Strength: Ultimate (UTS)

500 to 580 MPa 73 to 84 x 103 psi

Tensile Strength: Yield (Proof)

350 to 390 MPa 51 to 56 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


6.6 g/cm3 410 lb/ft3

Embodied Water

270 L/kg 32 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

88 to 100 MJ/m3

Resilience: Unit (Modulus of Resilience)

640 to 760 kJ/m3

Stiffness to Weight: Axial

8.3 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

21 to 25 points

Strength to Weight: Bending

21 to 24 points

Thermal Diffusivity

9.7 mm2/s

Thermal Shock Resistance

58 to 67 points

Alloy Composition

Zirconium (Zr)Zr 96.8 to 97.5
Niobium (Nb)Nb 2.4 to 2.8
Residualsres. 0 to 0.29

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B352: Standard Specification for Zirconium and Zirconium Alloy Sheet, Strip, and Plate for Nuclear Application

ASTM B353: Standard Specification for Wrought Zirconium and Zirconium Alloy Seamless and Welded Tubes for Nuclear Service (Except Nuclear Fuel Cladding)

Extractive Metallurgy of Niobium, C. K. Gupta and A. K. Suri, 1993

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010