Optimizing superplastic response in NAVALITE
Chester, Alden P.
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Superplastic ductilities up to 428 percent have been attained during research into thermomechanical processing of Al-2.70Mg-2.04Li-0.50Cu-0.13Zr (compositions in wt.pct.; alloy composition corresponding to NAVALITE). Variation in dislocation density induced by means of warm rolling at a series of temperatures below the discontinuous recrystallization temperature were expected to significantly affect the superplastic response by further grain size refinement. Experimental results indicate no beneficial enhancement in ductilities associated with rolling below 250 °C. Consistent elongations in the 400 percent range during this initial evaluation of the NAVALITE alloy indicates further investigation of superplastic response is warranted.
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