An investigation by interactive electron backscatter pattern analysis of processing and superplasticity in an aluminum-magnesium alloy
MetadataShow full item record
Tensile specimens from an Al-10Mg-0.1Zr alloy, thermomechanically processed (TMP) according to two different schedules and deformed superplastically at 300 C, were examined using electron backscatter pattern (EBSP) imaging in the scanning electron microscope (SEM) with computer-aided analysis. The TMP schedules differed only in the duration of the interpass anneal (IPA) time between successive rolling passes. Microtexture, grain misorientation angle distribution, and grain boundary character were analyzed for both undeformed grip and deformed gage sections of these tensile specimens. Microtexture analysis revealed the same texture components, primarily brass and S, in the undeformed grip sections of both TMP materials, while analysis of deformed gage sections revealed only a decrease in texture with no new components evident. Material processed with a prolonged IPA time exhibited highly superplastic response and contained a high proportion of boundaries of 5 to 15 deg misorientation. Material processed with a short IPA time exhibited lower superplastic elongations and contained higher-order twin boundaries, suggesting that the twin chain mechanism is active during TMP. The observed difference in tensile behavior appears to be the result of extended recovery during TMP of the more ductile material evidenced by the development of a greater proportion of boundaries of 5 to 15 deg misorientation.
The article of record as published may be found at http://dx.doi.org/101007/BF02651879
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Microtexture and grain boundary evolution during microstructural refinement processes in SUPRAL 2004 McNelley, T.R.; McMahon, M.E. (Springer, 1997);Electron backscatter pattern (EBSP) analysis of as-processed, processed and annealed, and superplastically deformed specimens of commercially processed SUPRAL 2004 material has been employed to reveal the boundary ...
McMahon, Michael E. (1986);High purity aluminum was torsionally deformed to various strains up to 16.33 at a temperature of 644 K in this study. The variation in the dislocation substructure was determined with increasing strain. Recent work revealed ...
Meyers, M.A.; Perez-Prado, M.T.; Xue, Q.; Xu, Y.; McNelley, T.R. (American Institute of Physics, 2001);Shear bands were generated under prescribed and controlled conditions in stainless steel (Fe- 18%Cr-8%Ni). Hat-shaped specimens, deformed in a Hopkinson bar were used, yielding strain rates of approximately 104s-1 and ...