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1.Decomposition of supersaturated solid solutions The classical alloy for heat-treatment is, of course, medium and high carbon steel. Thehardening of steel, by plunging the metal red-hot into water (so producing martensite), and itstoughening, by tempering the quenchhardened metal at a moderate temperature, have been knownempirically and used for thousands of years. Until this century it was not realized that other alloyscould be substantially hardened by heat-treatment. Wilm’s discovery that aluminium alloys whichcontain copper could be hardened by quenching and ageing or tempering came in 1906 and this was
1.Decomposition of supersaturated solid solutions The classical alloy for heat-treatment is, of course, medium and high carbon steel. Thehardening of steel, by plunging the metal red-hot into water (so producing martensite), and itougouing, by tempering the quenchhardened metal at a moderate temperature, have been knownempirically and used for thousands of years. Until this century it was not realized that other alloys can be hardened by heat-treatment. Wilm’s discovery that aluminum alloys whichcontain copper could be hardened by quenching and aging or tempering came in 1906 and this was