Tensile Properties of Die‐Forged Material after Heat Treatment

Zinc‐Containing Duralumins: Earlier Restricted Use The zinc‐containing duralumins have been around for quite a long time now. However, it is only within the past two decades or so that they have played a major role in aircraft construction, their design use having been restricted by certain aircraft companies because of occasional unpredictable service performance. Accepting the fact that some of the earlier, high strength, aluminium‐zinc alloys had a marked susceptibility to stress corrosion, and that some structural failures were directly attributed to this, it is now an established fact that some real and concrete progress has been achieved in reducing this susceptibility and the status of the modern variants of these alloys, when used for aircraft design purposes, is no longer a question of doubt. The informative article “New High Strength Aluminium Alloy”, by H. A. Holl published in Aircraft Engineering, January 1975, records significant progress in this direction. It covers the successful, sponsored...