UNS R60706 Zirconium-Niobium Alloy
R60706 alloy is a zirconium alloy. Cited properties are appropriate for the annealed condition. It has a fairly high tensile strength and a moderately low thermal conductivity among zirconium alloys. The graph bars on the material properties cards below compare R60706 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
16 %
Poisson's Ratio
0.34
Shear Modulus
37 GPa 5.3 x 106 psi
Tensile Strength: Ultimate (UTS)
580 MPa 84 x 103 psi
Tensile Strength: Yield (Proof)
390 MPa 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
Density
6.7 g/cm3 420 lb/ft3
Embodied Water
450 L/kg 54 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
82 MJ/m3
Resilience: Unit (Modulus of Resilience)
760 kJ/m3
Stiffness to Weight: Axial
8.1 points
Stiffness to Weight: Bending
23 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
23 points
Thermal Diffusivity
9.5 mm2/s
Thermal Shock Resistance
67 points
Alloy Composition
| Zr | 91 to 98 | |
| Nb | 2.0 to 3.0 | |
| Hf | 0 to 4.5 | |
| Cr | 0 to 0.2 | |
| Fe | 0 to 0.2 | |
| O | 0 to 0.16 | |
| C | 0 to 0.050 | |
| N | 0 to 0.025 | |
| H | 0 to 0.0050 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B551: Standard Specification for Zirconium and Zirconium Alloy Strip, Sheet, and Plate
Extractive Metallurgy of Niobium, C. K. Gupta and A. K. Suri, 1993
Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010