Application of EBSD Methods to Severe Plastic Deformation (SPD) and Related Processing Methods
Refinement and homogenization of microstructure are highly beneficial to the mechanical properties of engineering materials. Conventional thermomechanical treatments for this purpose typically include deformation processing to von Mises equivalent strains ≤5, while recently developed severe plastic deformation (SPD) processing methods have enabled systematic investigation of equivalent strains >10. Ultrafine grain sizes (even in the nanometer range) and strain hardening may contribute to dramatic improvements in ambient strength. Also, strength-toughness relationships as well as resistance to cyclic loading may be improved when grain refinement is combined with other strengthening mechanisms, although interactions among strengthening, toughening, crack initiation, and crack growth mechanisms are complex and often alloy-specific.
KeywordsSevere Plastic Deformationsevere Plastic Deformation Chip Thickness Friction Stir Welding Orientation Imaging Microscopy Shear Texture
The authors acknowledge financial support from the Defense Advanced Research Projects Agency (DARPA; Dr. L. Christodoulou), the Office of Naval Research (ONR; Dr. J. Christodoulou), the Air Force Office of Scientific Research (AFOSR; Dr. V. Giurgiutiu), the University of Texas-Austin (Prof. E.M. Taleff), and General Motors, Inc. (Dr. P.E. Krajewski) during the course of these various investigations. APZ, SS, and JQS also acknowledge financial support from the U.S. National Research Council postdoctoral program.
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