It was developed by the British National Physical Laboratory during World War I,[1] in an attempt to find an aluminium alloy that would retain its strength at high temperatures.
[3] Its strength, and its previously unknown age hardening behaviour had made it a popular choice for zeppelins.
The National Physical Laboratory began a series of experiments to study new aluminium alloys.
[5] Air Ministry Specification D.T.D 58A of April 1927 specified the composition and heat treatment of wrought Y alloy.
[7] The alloy became extremely important for pistons, and for engine components in general, but was little used for structural members of airframes.