EFFECT OF QUENCHING REGIMES ON THE STRUCTURE AND PROPERTIES OF AN ALLOY FROM THE AL-MG SYSTEM

All industrial alloys of the Al-Mg system correspond to the region of the a-solid solution of the phase diagram. Domestic alloys AL8 and AL2 7-1 and foreign alloys 520 (USA) and LM-10 (Great Britain) with a high magnesium content (9-11%) have high mechanical properties after quenc hing. However, they possess a high sensitivity to natural aging under conditions of long-term operation or storing, which causes their embri ttlement. The aim of the present work consists in developing an Al-Mg- base composition quenched and aged artificially that will possesses a high strength (sigma(r) = 380-400 N/mm(2)) and will not change in oper ation at a temperature of at most 100 degrees C.