Evolution of Texture and Microstructure in Deformed and Annealed Copper-Iron Multilayer
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MULTILAYER composites consisting of alternate layers of soft and hard material provide a better combination of strength and ductility than is available with either component by itself. When the grain sizes in such multilayers are refined from hundreds of microns down to the submicron range, tremendous increases in strength have been reported.[1–5] Such multilayers are, therefore, of great technical importance. Because of its processing simplicity and the ability to make large amounts of material, accumulative roll bonding (ARB) has been extensively applied recently to produce multilayer composites with grain sizes in the range of submicron to nanometers,[1–3] depending on the thinness of the layers achieved. Additional deformation of ARB-processed materials leads to better bonding across the layers.[4] Since microstructure and texture strongly influence the mechanical properties of plastically deformed materials, it is important to understand the evolution of microstructure and texture in metallic multilayers. The evolution of microstructure and texture during ARB has been studied in detail, both for similar K.S. SURESH, formerly with the Department of Materials Engineering, Indian Institute of Science, Bangalore 560 012, India, is now Assistant Professor with the School of Engineering Sciences and Technology, University of Hyderabad, Hyderabad, India. A.D. ROLLETT, Professor, is with the Department of Materials Science and Engineering, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213. SATYAM SUWAS, Associate Professor, is with the Department of Materials Engineering, Indian Institute of Science. Contact e-mail: [email protected] Manuscript submitted January 26, 2015. Article published online November 23, 2015 852—VOLUME 47A, FEBRUARY 2016
as well as dissimilar multilayers.[6–17] In particular, the combination of fcc with bcc in multilayers has shown remarkable changes in the evolution of texture compared to their constituent materials.[9–15] Raabe et al.[18] reported a strong {001}h110i component along a fiber for the niobium phase in copper-niobium composites. Recent investigations of ARB-processed samples demonstrate characteristic deviations in the texture of Copper/Niobium multilayers, which have been attributed to (i) confined layer slip, (ii) co-rotation of phases, and (iii) consequent changes in the orientation relation between phases, (iv) constricted annealing, and (v) strain partitioning.[9–12,17] Similar to Copper/Niobium composites, Copper/Iron composites prepared either by melting or powder metallurgy have shown remarkable enhancements in mechanical properties.[19–23] In copper-iron composites, the soft copper layer shows more rapid texture evolution compared to the hard iron layer. However, the opposite behavior has also been reported.[18–21] Unlike Copper/ Niobium, no detailed study on the evolution of texture in Copper/Iron multilayers has been carried out. One of the significant factors that affects texture evolution in ARB-processed multilayers is the interfac
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