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Microstructure, Texture and Vacancy-Type Defects in Severe Plastic Deformed Aluminium Alloys Lihong Su University of Wollongong

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Microstructure, Texture and Vacancy-Type Defects in Severe Plastic Deformed Aluminium Alloys Lihong Su University of Wollongong University of Wollongong Research Online University of Wollongong Thesis Collection University of Wollongong Thesis Collections 2012 Microstructure, texture and vacancy-type defects in severe plastic deformed aluminium alloys Lihong Su University of Wollongong Recommended Citation Su, Lihong, Microstructure, texture and vacancy-type defects in severe plastic deformed aluminium alloys, Doctor of Philosophy thesis, School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, 2012. http://ro.uow.edu.au/theses/ 3798 Research Online is the open access institutional repository for the University of Wollongong. For further information contact the UOW Library: [email protected] Microstructure, Texture and Vacancy-type Defects in Severe Plastic Deformed Aluminium Alloys A thesis submitted for the award of the degree of Doctor of Philosophy from UNIVERSITY OF WOLLONGONG by Lihong Su BEng, MEng School of Mechanical, Materials and Mechatronic Engineering Faculty of Engineering 2012 Declaration I, Lihong Su, declare that this thesis, submitted in fulfilment of the requirements for the award of Doctor of Philosophy, in the School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Australia, is wholly my own work unless otherwise referenced or acknowledged, and has not been submitted for qualifications at any other university or academic institution. Lihong Su August 2012 I Acknowledgements I would like to express my sincere gratitude to my supervisors, Professor Kiet Tieu, Dr. Cheng Lu and Dr. David Wexler. There is no way that I could finish this thesis without their continuous guidance, constant encouragement and great support over the years. Professor Kiet Tieu has meetings with students on a weekly basis and always manages to help students with their work. As brilliant a man as he is, Dr. Cheng Lu has great scientific vision, is hard working, has great patience and politeness, and from whom I learned a lot. Dr. David Wexler is a nice and intelligent man, and I am grateful for his help and suggestions with my work. I also appreciate the invaluable advice given by associate Professor Huijun Li. I am grateful to Dr. Azdiar Gazder for his help on texture analysis and EBSD work. I would also like to express my appreciation to Dr. Hongtao Zhu, Dr. Liang Chen, Dr. Ayesha Haq and Dr. Zhixin Chen for their help and support. Special thanks to doctor-to-be Ahmed Saleh, for his great help, and all the valuable discussions we’ve had. I wish to take the opportunity to thank Mr. Greg Tillman, Mr. Bob de Jong, Mr. Nick Mackie, Mr. Joe Abbott, Mr. Ron Marshall and Mr. Stuart Rodd for their great help in my experiments, and their friendship. I would also like to thank associate Professor Lizi He from Northeastern University, China for her help with ECAP processing, Dr. Laichang Zhang at the University of Western Australia for his help on the PALS tests, and Dr. Vladmir Luzin at ANSTO for his help of texture measurement with neutron diffraction. I would also like to thank my fellow students and my friends Qiang Zhu, Yong Sun, Laia Ledo, Hakim W. Zamri, Haibo Xie and Hejie Li. We shared our feelings, comfort III and support each other during the PhD process. I feel very lucky to have such good friends. I would also like to thank Professor Xudong Sun at Northeastern University, China for his support of my studying in Australia, and also the China Scholarship Council for the scholarship they offered during my PhD study. Finally, I would like to offer my appreciation to my family, my parents and my husband, for their unconditional love, support and encouragement. IV List of Publications 1. L.H. Su, C. Lu, A.K. Tieu and G.Y. Deng, Ultrafine grained AA1050/AA6061 composite produced by accumulative roll bonding, Materials Science and Engineering A 559 (2013) 345–351 2. L.H. Su, C. Lu, L.Z. He, L.C. Zhang, P. Guagliardo, A.K. Tieu, S.N. Samarin, J.F. Williams and H.J. Li, Study of vacancy-type defects by positron annihilation in ultrafine-grained aluminium severely deformed at room and cryogenic temperatures, Acta Materialia 60 (2012) 4218–4228 3. L.H. Su, C. Lu, G.Y. Deng, A.K. Tieu and X.D. Sun, FEM and experimental analysis of commercial Al alloys during accumulative roll bonding process, Advanced Science Letters, accepted on 04/09/2011 4. L.H. Su, C. Lu, G.Y. Deng, A.K. Tieu and X.D. Sun, Microstructure and mechanical properties of 1050/6061 laminated composite processed by accumulative roll bonding, Reviews on Advanced Materials Science, accepted on 25/05/2011 5. L.H. Su, C. Lu, A.K. Tieu, L.Z. He, Y. Zhang and D. Wexler, Vacancy-assisted hardening in nanostructured metals, Materials Letters 65 (2011) 514–516 6. L.H. Su, C. Lu, T. McNeice and A.K. Tieu, Effect of nano-sized particles on bond strength in accumulative roll bonding, ICONN 2010, Sydney 7. G.Y. Deng, C. Lu, L.H. Su, A.K. Tieu and X.H. Liu, Crystal plasticity investigation of texture evolution of Al single crystal during extrusion through a bent channel, Journal of Computational and Theoretical Nanoscience, accepted, doi: 10.1166/jctn.2012.2228 8. C. Lu, G.Y. Deng, A.K. Tieu, L.H. Su, H.T. Zhu and X.H. Liu, Crystal plasticity modelling of texture evolution and heterogeneity in equal channel angular pressing of aluminium single crystal, Acta Materialia, 59 (2011) 3581–3592 V 9. G.Y. Deng, C. Lu, A.K. Tieu, L.H. Su, N.N. Huynh and X.H. Liu, Crystal plasticity investigation of friction effect on texture evolution of Al single crystal during ECAP, Journal of Materials Science, 45 (2010) 4711–4717 10. G.Y. Deng, C. Lu, L.H. Su, X.H. Liu and A.K. Tieu, Modelling texture evolution during ECAP of copper single crystal by crystal plasticity FEM, Materials Science and Engineering A, 534 (2012) 68–74 VI Table of Contents Declaration ................................................................................................................................ I Acknowledgements ................................................................................................................. III List of Publications ................................................................................................................... V Table of Contents ................................................................................................................... VII Abstract ..................................................................................................................................... i List of Abbreviations ................................................................................................................ iii List of Tables ............................................................................................................................. v List of Figures ........................................................................................................................... vi Chapter 1 Introduction ............................................................................................................ 1 Chapter 2 Literature review ..................................................................................................... 5 2.1 Equal channel angular pressing ..................................................................................... 5 2.1.1 Equal channel angular pressing deformation ....................................................... 5 2.1.2 Processing route of equal channel angular pressing ............................................ 7 2.1.3 Microstructure evolution during equal channel angular pressing ....................... 8 2.1.4 Influence of deformation temperature on equal channel angular pressing ...... 11 2.2 Accumulative roll bonding ........................................................................................... 14 2.2.1 Accumulative roll bonding deformation ............................................................. 14 2.2.2 Microstructure evolution during accumulative roll bonding ............................. 15 2.2.3 Shear strain distribution of accumulative roll bonding processed sheets ......... 16 2.2.4 Processing laminated composites by accumulative roll bonding ....................... 18 2.3 Grain refinement during severe plastic deformation .................................................. 21 2.4 Mechanical behaviour of severe plastic deformed materials ..................................... 25 2.5 Texture of severe plastic deformed materials ............................................................. 29 2.5.1 Texture representation ....................................................................................... 29 2.5.2 Texture measurement ........................................................................................ 30 2.5.3 ECAP texture ....................................................................................................... 33 2.5.4 ARB texture ......................................................................................................... 35 2.6 Characterisation of the defects in ultrafine grained materials .................................... 37 2.6.1 TEM technique .................................................................................................... 38 2.6.2 X-ray profile analysis ........................................................................................... 39 2.6.3 Positron annihilation lifetime spectroscopy ....................................................... 41 2.7 Summary and scope of the thesis ...............................................................................
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