抄録
An enormous number of duralumin rivets are used in making an aeroplane. As Duralumin is an Aluminium alloy age hardens very quickly after quenching almost of its maximum property, then the riveting work sometimes encounters several inconveniences and is lowerd its efficiencies.
The present work is carried out to reduce these troubles. By an addition of Mn more than one percent on the alloy Al+Cu2+Mg2%, the hardening process in the ageing curve at 25° is suppressed about 120 hours after quenching. Above alloy is named D4. Improveing the D4 alloy, a few alloys were obtained as shown in following table. The riveting material invented in “Heinkel” Company is reffered in the same table.
