DWA-USA, the global leader for Aluminum
Metal-Matrix-Composites for Lighter Weight Designs

Highly Loaded Al MMCs contain SiC particle contents of 40 Vol% and greater. Matrix alloy selection is based on specific manufacturing and application requirements. AA6091 is selected to maximize forgeability, AA6092 for maximized strength in the billet form, and 6063 for high thermal conductivity. Minimum Coefficient-of-Thermal-Expansion (CTE) and maximum elastic modulus are the material property objectives of highly loaded Al MMCs.

Highly Loaded Al MMCs are powder metallurgy Al MMCs comprised of AA6091, AA6092 or AA6063 aluminum and either 40, 44 or 50 Vol% Silicon Carbide particles. They are available in vacuum-hot-pressed billet, extruded, and forged product forms.

  • CTE equivalent to Be and Cu-W
  • Elastic modulus 2-2.5X conventional aluminum
  • Aluminum thermal conductivity
Units:
Eng

TYPICAL AND MINIMUM MECHANICAL PROPERTIES FOR EXTRUSION AND FORGINGS

6091 & 6092/SiC/40p-T6
Density= 0.1054 lb/in3
F, ty
ksi
F, tu
ksi
elong.
%
6091/SiC/40p-T6
Extrusion, 3in2
Closed Die Forging, 6in
Typical L, LT 62 78 1.9
6092/SiC/40p-T6
Extrusion, 3in2
Typical L, LT 75 82 1.5
Minimum Properties Minimum L, LT 55 65 1
Notes:
1) Young's Modulus is typically 20 msi in both the L and LT orientations.
2) Coefficient-of-Thermal-Expansion (CTE) is typically 6.7 ppm/°F.
3) Typical Rockwell B hardness is 86-88.
Data is representative for 1 inch maximum section thickness during heat treatment. Mechanical properties will be dependent on the Al MMC material system, product form, geometry
and heat treatment method.
Si

TYPICAL AND MINIMUM MECHANICAL PROPERTIES FOR EXTRUSION AND FORGINGS

6091 & 6092/SiC/40p-T6
Density= 2.92 g/cm3
F, ty
MPa
F, tu
MPa
elong.
%
6091/SiC/40p-T6
Extrusion, 19.4cm2
Closed Die Forging, 152mm
Typical L, LT 427 538 1.9
6092/SiC/40p-T6
Extrusion, 19.4cm2
Typical L, LT 517 565 1.5
Minimum Properties Minimum L, LT 379 448 1
Notes:
1) Young's Modulus is typically 138 GPa in both the L and LT orientations.
2) Coefficient-of-Thermal-Expansion (CTE) is typically 12.1 ppm/°C.
3) Typical Rockwell B hardness is 86-88.
Data is representative for 25 mm maximum section thickness during heat treatment. Mechanical properties will be dependent on the Al MMC material system, product form, geometry
and heat treatment method.

 

 

MATRIX ALLOY CHEMICAL COMPOSITION FOR 6091 & 6092/SiC/40p

6091 & 6092/SiC/40p
Density= 0.1054 lb/in3 (2.92 g/cm3)
  Al Cu Mg Si Fe Zn Ti Ni Cr Mn O Other,
Each
Others,
Total
6091 Bal 0.15-
0.40
0.8-
1.2
0.40-
0.8
0.7
max
0.25
max
0.15
max
-- 0.15
max
0.15
max
0.050-
0.50
0.05
max
0.15
max
6092 Bal 0.7-
1.0
0.8-
1.2
0.40-
0.8
0.30
max
0.25
max
0.15
max
-- 0.15
max
0.15
max
0.050-
0.50
0.05
max
0.15
max
Notes:
1) Compositional limits shown as weight percent (wt%).
2) Silicon carbide particle content shall be maintained at 40 ±1.0 Vol%.

The CTE of Al MMCs decreases with increasing volume loading. At a 40% SiC content, Al MMC CTE is equivalent to Beryllium. At a 50% SiC content, Al MMC CTE begins to approach that of far heavier electronic packaging materials such as Copper-Tungsten (Cu-W).

 

SiC Vol% CTE ppm/°C CTE ppm/°F
0p 23.4 13.0
17.5p 16.6 9.2
25p 13.8 7.7
40p 12.1 6.7
44p 11.7 6.5
50p 9.6 5.3

Al MMC Coefficient-of-Thermal-Expansion (CTE) as a Function of SiC Particle Loading

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