On Plastic Deformation Behavior of Cryorolled AA8090 Alloy View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2016-08-19

AUTHORS

K. S. V. B. R. Krishna, M. Ashfaq, V. Varun, K. Sivaprasad, K. Venkateswarlu, Sarma S. R. Akella

ABSTRACT

AA8090 alloy was rolled up to 50 and 75 % reductions at both liquid nitrogen (LNR) and room temperatures (RTR). Both hardness and tensile behavior were evaluated on rolled samples. Optical microscope, TEM and EBSD were used for detailed microstructural examination of rolled samples. Williamson-Hall peak broadening analysis on X-ray diffraction data was made to evaluate crystallite size, lattice strain and dislocation density. An enhanced tensile strength was evidenced in LNR samples when compared to RTR samples without sacrificing ductility, which was ascribed to the higher density of dislocations in LNR samples than RTR samples. A large number of dislocation tangled regions along with ultrafine grain structure were evidenced through TEM and EBSD. Significant fraction of special boundaries in combination with increased fraction of texture components like S, Brass, Cu and Goss would be another reason for enhanced properties in LNR conditions than that of RTR. These components were observed to be strengthened with increased rolling reduction. Work hardening behavior clearly evidenced the variation in amount of work hardening and recovery phenomenon. It showed large variation in recovery in the case of 50 % reduction than that of 75 % reduction, which was attributed to significantly higher density of dislocations in 75 % rolled samples in RTR and LNR. More... »

PAGES

1463-1475

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12666-016-0943-3

DOI

http://dx.doi.org/10.1007/s12666-016-0943-3

DIMENSIONS

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