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7075 Aluminum vs. Hafnia

7075 aluminum and hafnia belong to fundamentally different material chemistries. 7075 aluminum is a metal, while hafnia is a ceramic material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 10 material properties with values for both materials. Properties with values for just one material (22, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is 7075 aluminum and the bottom bar is hafnia.

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 3.0
9.7
Elastic (Young's, Tensile) Modulus, GPa 70
57
Maximum Temperature: Mechanical, °C 200
2800
Melting Onset (Solidus), °C 480
2900
Specific Heat Capacity, J/kg-K 870
120
Stiffness to Weight: Axial, points 13
3.3
Stiffness to Weight: Bending, points 46
13
Thermal Conductivity, W/m-K 130
1.1
Thermal Diffusivity, mm2/s 50
0.95
Thermal Expansion, µm/m-K 23
6.0