
1) Aluminium alloy
Found on
https://www.crosswordclues.com/clue/alclad

Alclad is a corrosion-resistant aluminium sheet formed from high-purity aluminium surface layers metallurgically bonded to high-strength aluminium alloy core material. These sheets are commonly used by the aircraft industry. The first aircraft to be constructed from Alclad was the all-metal Navy airship ZMC-2, constructed in 1927 at Naval Air Stat...
Found on
http://en.wikipedia.org/wiki/Alclad

Trademark name of Alcoa for high-strength sheet aluminum clad with a layer (approximately 5.5% thickness per side) of high-purity aluminum, popularly used in airplane manufacture.
Found on
http://www.aerofiles.com/glossary.html

Composite wrought product comprised of an aluminum alloy core having on one or both surfaces a metallurgically bonded aluminum or aluminum alloy coating that is anodic to the core and thus electrochemically protects the core against corrosion.
Found on
http://www.encyclo.co.uk/local/20742

Composite wrought product comprised of an aluminum alloy core having on one or both surfaces a metallurgically bonded aluminum or aluminum alloy coating that is anodic to the core and thus electrochemically protects the core against corrosion
Found on
http://www.encyclo.co.uk/local/21115

A sandwich of high-strength aluminium alloy sheet between two sheets of commercially pure metal for a combination of strength and corrosion resistance. Produced by rolling.
Found on
http://www.metalbulletin.com/Glossary.html

Trademark of Alcoa used as a generic term to describe corrosion resistant Aluminum sheet formed from high-purity aluminum surface layers metallurgically bonded to high strength Aluminum Alloy core material. These sheets commonly used by the aircraft industry.
Found on
https://www.encyclo.co.uk/local/22323

Composite sheet produced by bonding either corrosion-resistant aluminum alloy or aluminum of high purity to base metal of structurally stronger aluminum alloy. The coatings are anodic to the core so they protect exposed areas of the core electrolytically during exposure to corrosive environment.
Found on
https://www.unifiedalloys.com/resources/glossary/
No exact match found.