Nuclear Grade Hafnium vs. Nickel 625

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while nickel 625 belongs to the nickel alloys. There are 17 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is nickel 625.

Nuclear Grade (Grade R1) Hafnium Nickel Alloy 625 (N06625, NA21)

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		78
Elastic (Young's, Tensile) Modulus, GPa		200

Elongation at Break, %		25
Elongation at Break, %		33 to 34

Poisson's Ratio		0.26
Poisson's Ratio		0.29

Shear Modulus, GPa		31
Shear Modulus, GPa		79

Tensile Strength: Ultimate (UTS), MPa		350
Tensile Strength: Ultimate (UTS), MPa		790 to 910

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		320 to 450

Thermal Properties

Latent Heat of Fusion, J/g		130
Latent Heat of Fusion, J/g		330

Specific Heat Capacity, J/kg-K		140
Specific Heat Capacity, J/kg-K		440

Thermal Expansion, µm/m-K		5.9
Thermal Expansion, µm/m-K		13

Otherwise Unclassified Properties

Density, g/cm³		13
Density, g/cm³		8.6

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		73
Resilience: Ultimate (Unit Rupture Work), MJ/m³		220 to 250

Resilience: Unit (Modulus of Resilience), kJ/m³		180
Resilience: Unit (Modulus of Resilience), kJ/m³		260 to 490

Stiffness to Weight: Axial, points		3.3
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		11
Stiffness to Weight: Bending, points		23

Strength to Weight: Axial, points		7.4
Strength to Weight: Axial, points		26 to 29

Strength to Weight: Bending, points		8.4
Strength to Weight: Bending, points		22 to 24

Thermal Shock Resistance, points		55
Thermal Shock Resistance, points		22 to 25

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.4

Carbon (C), %		0
Carbon (C), %		0 to 0.1

Chromium (Cr), %		0
Chromium (Cr), %		20 to 23

Cobalt (Co), %		0
Cobalt (Co), %		0 to 1.0

Hafnium (Hf), %		99.8 to 100
Hafnium (Hf), %		0

Iron (Fe), %		0
Iron (Fe), %		0 to 5.0

Manganese (Mn), %		0
Manganese (Mn), %		0 to 0.5

Molybdenum (Mo), %		0
Molybdenum (Mo), %		8.0 to 10

Nickel (Ni), %		0
Nickel (Ni), %		58 to 68.9

Niobium (Nb), %		0
Niobium (Nb), %		3.2 to 4.2

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.015

Silicon (Si), %		0
Silicon (Si), %		0 to 0.5

Sulfur (S), %		0
Sulfur (S), %		0 to 0.015

Titanium (Ti), %		0
Titanium (Ti), %		0 to 0.4

Residuals, %		0 to 0.23
Residuals, %		0