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K94200 Alloy vs. 7049A Aluminum

K94200 alloy belongs to the iron alloys classification, while 7049A aluminum belongs to the aluminum alloys. There are 22 material properties with values for both materials. Properties with values for just one material (9, 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 K94200 alloy and the bottom bar is 7049A aluminum.

UNS K94200 (FeNi42, 1.3917) Low Expansion Alloy7049A (AlZn8MgCu) Aluminum
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 140
71
Elongation at Break, % 5.0 to 32
5.0 to 5.7
Poisson's Ratio 0.34
0.32
Shear Modulus, GPa 54
27
Shear Strength, MPa 330 to 410
340 to 350
Tensile Strength: Ultimate (UTS), MPa 500 to 710
580 to 590
Tensile Strength: Yield (Proof), MPa 270 to 650
500 to 530

Thermal Properties

Melting Onset (Solidus), °C 1440
430
Specific Heat Capacity, J/kg-K 500
850
Thermal Conductivity, W/m-K 15
130
Thermal Expansion, µm/m-K 5.0
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
40
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
120

Otherwise Unclassified Properties

Density, g/cm3 8.2
3.1

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 35 to 130
28 to 32
Resilience: Unit (Modulus of Resilience), kJ/m3 250 to 1460
1800 to 1990
Stiffness to Weight: Axial, points 9.8
13
Stiffness to Weight: Bending, points 21
44
Strength to Weight: Axial, points 17 to 24
52 to 53
Strength to Weight: Bending, points 17 to 22
50 to 51
Thermal Diffusivity, mm2/s 3.7
50
Thermal Shock Resistance, points 49 to 70
25