Dr. Dmitri Kopeliovich

Aluminum alloys, possessing exceptional mechanical properties, are prepared by powder technology.

These alloys are called sintered alloys or Sintered Aluminum Powders (SAP).

Sintered aluminum alloys have the following advantages:

• High strength (very high strength-to-weight ratio);

• High fatigue strength;

• High creep resistance;

• Excellent machinability;

• Refractoriness (ability to retain the properties at elevated temperatures);

• Very good cryogenic properties;

• Low coefficient of thermal expansion;

Unique properties of the sintered aluminum alloys are result of presence of aluminum oxide (Al₂O₃) in the alloy structure.

Film of aluminum oxide covers each aluminum powder particle.

The oxide film is not reduced in the sintering and it prevents movement of dislocationsthrough the aluminum grain boundaries, providing the outstanding mechanical properties of the alloys.

Some of sintered aluminum alloys besides aluminum oxide contain also aluminum carbide (Al₄C₃).

Concentration of aluminum oxide in the sintered aluminum alloys varies between 1 to 20%, depending on the thickness of the oxide film and on the powder particles sizes.

Aluminum sintered alloys are sintered at 1000-1200°F (540-650°C) for 10-20 minutes.

(Materials Data)

• Sintered aluminum alloy A
• Sintered aluminum alloy B
• Sintered aluminum alloy E
• Sintered aluminum alloy F

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• Classification of aluminum alloys
• Temper designation of aluminum alloys
• Effects of alloying elements on properties of aluminum alloys
• Wrought aluminum alloys
• Cast aluminum alloys
• Fluxes for melting aluminum
• Degassing treatment of molten aluminum alloys
• Aluminum extrusion

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