Nuclear Grade Hafnium vs. Nickel 684

Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while nickel 684 belongs to the nickel alloys. There are 17 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is nickel 684.

Nuclear Grade (Grade R1) Hafnium Nickel Alloy 684 (2.4983, N07500)

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, %		11

Poisson's Ratio		0.26
Poisson's Ratio		0.29

Shear Modulus, GPa		31
Shear Modulus, GPa		76

Tensile Strength: Ultimate (UTS), MPa		350
Tensile Strength: Ultimate (UTS), MPa		1190

Tensile Strength: Yield (Proof), MPa		170
Tensile Strength: Yield (Proof), MPa		800

Thermal Properties

Latent Heat of Fusion, J/g		130
Latent Heat of Fusion, J/g		320

Specific Heat Capacity, J/kg-K		140
Specific Heat Capacity, J/kg-K		470

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

Otherwise Unclassified Properties

Density, g/cm³		13
Density, g/cm³		8.3

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		73
Resilience: Ultimate (Unit Rupture Work), MJ/m³		120

Resilience: Unit (Modulus of Resilience), kJ/m³		180
Resilience: Unit (Modulus of Resilience), kJ/m³		1610

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		40

Strength to Weight: Bending, points		8.4
Strength to Weight: Bending, points		30

Thermal Shock Resistance, points		55
Thermal Shock Resistance, points		34

Alloy Composition

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Aluminum (Al), %		0
Aluminum (Al), %		2.5 to 3.3

Boron (B), %		0
Boron (B), %		0.0030 to 0.010

Carbon (C), %		0
Carbon (C), %		0 to 0.15

Chromium (Cr), %		0
Chromium (Cr), %		15 to 20

Cobalt (Co), %		0
Cobalt (Co), %		13 to 20

Copper (Cu), %		0
Copper (Cu), %		0 to 0.15

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

Iron (Fe), %		0
Iron (Fe), %		0 to 4.0

Manganese (Mn), %		0
Manganese (Mn), %		0 to 0.75

Molybdenum (Mo), %		0
Molybdenum (Mo), %		3.0 to 5.0

Nickel (Ni), %		0
Nickel (Ni), %		42.7 to 64

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

Silicon (Si), %		0
Silicon (Si), %		0 to 0.75

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

Titanium (Ti), %		0
Titanium (Ti), %		2.5 to 3.3

Residuals, %		0 to 0.23
Residuals, %		0