Effect of Phase Contiguity and Morphology on the Evolution of Deformation Texture in Two-Phase Alloys
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Deformation texture evolution in two-phase xFe-yNi-(100-x-y)Cr model alloys and Ti-13Nb-13Zr alloy was studied during rolling to develop an understanding of micro-mechanisms of deformation in industrially relevant two-phase FCC-BCC steels and HCP-BCC titanium alloys, respectively. It was found that volume fraction and contiguity of phases lead to systematic changes in texture, while morphology affects the strength of texture. There was a characteristic change in texture from typical Brass-type to a weaker Copper-type texture in the austenite phase accompanied with a change from alpha fiber to gamma fiber in ferrite phase for Fe-Ni-Cr alloys with increase in fraction of harder ferrite phase. However, similar characteristic texture evolution was noted in both α and β phase irrespective of the different initial morphologies in Ti-13Nb-13Zr alloy. Viscoplastic self-consistent simulations with two-phase scheme were able to qualitatively predict texture evolution in individual phases. It is proposed that the transition from iso-strain-type behavior for equiaxed microstructure at low strain to iso-stress-type behavior at higher strain is aided by the presence of higher volume fraction of the second phase and increasing aspect ratio of individual phases in two-phase alloys.
KeywordsPole Figure Austenite Phase Ferrite Phase Orientation Distribution Function Ferrite Content
The authors would like to acknowledge Dr. S. K. Bhaumik of National Aeronautical Laboratory, Bangalore, India, for providing the assistance in melting the alloys used in the present study. The authors are grateful to Dr. C. N. Tome and Dr. R. A. Lebensohn (Los Alamos National Laboratory, USA) for providing VPSC-7 code. NPG had useful discussions with Dr. K. S. Suresh. The authors thank the Department of Science and Technology, Government of India, for providing characterization facilities at the Institute X-ray facility and Advanced Facility for Microscopy and Microanalysis at Indian Institute of Science, Bangalore, India.
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