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The hot working characteristics of hot rolled Mg– 11.5Li – 1.5Al (wt.%) alloy have been studied using hot compression tests in the temperature range 200 –450°C and strain rate range of 0.001 – 100 s –1 . Using the principles of dynamic material model and on the basis of the hot compression data, a processing map has been developed for this alloy. The map exhibited two domains: (i) with a peak efficiency of about 62% occurring at 450 °C and 0.001 s –1  (ii) with a peak efficiency of about 58% occurring at 300 °C and 0.001 s –1 . On the basis of microstructural features, the apparent activation energy for hot deformation (110 kJ/mol) and very high tensile ductilities, the second domain has been identified to represent superplastic deformation. In the first domain, the microstructure of the specimen revealed intergranular cracking and it is therefore not a safe domain for processing.

Processing map for hot working of hot rolled Mg– 11.5Li –1.5Al alloy