Comparison of compressive deformation of ultrafine-grained 5083 Al alloy at 77 and 298 K

The compression behaviors of well-annealed coarsegrained (CG) and ultrafine-grained (UFG) 5083 Al alloys at 77 and 298 K were compared. For the CG alloy, stage II and III strain hardening were dominant at 77 and 298 K, respectively, depending on the completeness of dislocation cell formation. The UFG alloy exhibited the elastic-near perfectly plastic behavior without distinctive dislocation cell formation at both temperatures. For both alloys, the flow stress at 77 K was much higher than that at 298 K. This work was supported by the Basic Research Program (Grant No. R01-2003-000-10202-0) of the Korea Science & Engineering Foundation.