Aluminum 7178

Aging Procedure

AL Clad 7178 is used in the "as supplied" condition.

Annealing Procedure

Annealing should be avoided to prevent diffusion of the core and clad alloys which could disturb the corrosion resistance of the clad AL 7072 alloy.

Applications

Commonly used in the manufacture of aircraft and other structures.

Cold Workability

AL Clad 7178 cold works as does the unclad AL 7178 alloy.

Forgeability

AL Clad 7178 is used in the "as supplied" condition. Heat input for forging would disturb the corrosion resistance of the cladding because of diffusion between core and clad alloys.

Formability

Forming characteristics are the same as for unclad AL 7178 alloy.

Hardening Procedure

Hardens due to cold work.

Heat Treatability

AL Clad 7178 should be used in the "as supplied" condition. Heat treatment could result in diffusion between the core and clad alloys thus disturbing the corrosion characteristics of the cladding.

Hot Workability

AL Clad 7178 should be used in the "as supplied" condition. Heat input for hot working could result in diffusion between the core and clad alloys thus disturbing the corrosion characteristics of the clad AL 7072 alloy.

Machinability

Machinability is that of unclad AL 7178 alloy.

Other Comments

AL Clad 7178 has a cladding of AL 7072 upon a core of AL 7178 alloy. The cladding is normally on both sides and clad thickness ( on each side) varies from 1.5% to 4% of the total composite thickness.

Other Mechanical Properties

Mechanical properties are those of the core material AL 7178 alloy.

Other Physical Properties

Physical properties are basically controlled by the core alloy. In this case the properties of AL 7178 apply.

Principle Design Features

AL Clad 7178 consists of AL 7072 alloy cladding on both sides to a core of AL 7178 alloy. The cladding provides anodic corrosion protection to the core alloy of AL 7178.

Tempering Procedure

Not applicable.

Weldability

Welding may be done to AL Clad 7178. However the resultant weld and HAZ may have different corrosion properties because of diffusion between the core and clad alloy from the heat of welding.