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Effects of Different Modes of Hot Cross-Rolling in 7010 Aluminum Alloy: Part I. Evolution of Microstructure and Texture

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Abstract

The current study describes the evolution of microstructure and texture in an Al-Zn-Mg-Cu-Zr-based 7010 aluminum alloy during different modes of hot cross-rolling. Processing of materials involves three different types of cross-rolling. The development of texture in the one-step cross-rolled specimen can be described by a typical β-fiber having the maximum intensity near Copper (Cu) component. However, for the multi-step cross-rolled specimens, the as-rolled texture is mainly characterized by a strong rotated-Brass (Bs) component and a very weak rotated-cube component. Subsequent heat treatment leads to sharpening of the major texture component (i.e., rotated-Bs). Furthermore, the main texture components in all the specimens appear to be significantly rotated in a complex manner away from their ideal positions because of non-symmetric deformations in the two rolling directions. Detailed microstructural study indicates that dynamic recovery is the dominant restoration mechanism operating during the hot rolling. During subsequent heat treatment, static recovery dominates, while a combination of particle-stimulated nucleation (PSN) and strain-induced grain boundary migration (SIBM) causes partial recrystallization of the grain structure. The aforementioned restoration mechanisms play an important role in the development of texture components. The textural development in the current study could be attributed to the combined effects of (a) cross-rolling and inter-pass annealing that reduce the intensity of Cu component after each successive pass, (b) recrystallization resistance of Bs-oriented grains, (c) stability of Bs texture under cross-rolling, and (d) Zener pinning by Al3Zr dispersoids.

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Acknowledgments

The authors wish to acknowledge the financial support by the DRDO, Government of India. The microtexture studies were carried out using the FEG-SEM facility at the Institute Nano-Science Initiative, the Indian Institute of Science, Bangalore.

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Authors and Affiliations

  1. Structure and Failure Analysis Group, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500058, India

    Chandan Mondal (Sceintist) & A. K. Singh (Sceintist)

  2. Rolling and Formability Group, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500058, India

    A. K. Mukhopadhyay (Sceintist)

  3. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India

    K. Chattopadhyay (Professor)

Authors
  1. Chandan Mondal
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  2. A. K. Singh
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  3. A. K. Mukhopadhyay
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  4. K. Chattopadhyay
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Correspondence to Chandan Mondal.

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Manuscript submitted January 12, 2012.

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Mondal, C., Singh, A.K., Mukhopadhyay, A.K. et al. Effects of Different Modes of Hot Cross-Rolling in 7010 Aluminum Alloy: Part I. Evolution of Microstructure and Texture. Metall Mater Trans A 44, 2746–2763 (2013). https://doi.org/10.1007/s11661-013-1626-x

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