Creep, Deformation and Fracture Studies of Materials for Various Technologies in the Nuclear Materials Research Group at NC State
A brief outline of the research activities during the past three decades in the Nuclear Materials Research Group at NC State University is summarized that comprises of creep mechanisms in materials, reliability of solders in electronic packaging, dynamic strain aging, radiation embrittlement of ferritic steels, anisotropic biaxial creep of hexagonal closed packed metals with emphasis on Zircaloy cladding, in-service monitoring of structural materials using ABI, non-interactive Nuclear Magnetic Resonance studies of dynamical behavior of point and line defects during deformation, and radiation effects in nanocrystalline materials. All the described aspects are the outcomes of research experiences of the author starting from his MS thesis at Cornell University on creep of alpha iron and doctoral thesis research on NMR studies followed by post-doctoral research at the University of California in Berkeley on creep and superplasticity, and University of Newcastle, Australia on radiation effects on yield point phenomena in steels.
KeywordsCreep Fracture Strain aging Diffusion NMR
I express my sincere appreciation to mentors during my graduate studies (Prof. Art Ruoff of Cornell University) and post-doctoral experiences (Prof. John Dorn of UC Berkeley and Prof. E.O. Hall of the University of Newcastle) as well as my collaborators during my 7 years of industrial stint (Zircaloys at Babcock & Wilcox Co., and Fracture Mechanics at Westinghouse Research Center) for not only inculcating in me the required understanding of fundamentals but also the implications of basic science to technological relevance. All these studies were not possible without the sincere and hard work of many of my students during their graduate studies and post-doctoral fellows at NC State University both in Nuclear Engineering and Materials Science and Engineering departments. I am pleased to acknowledge the benefit I gained from many collaborations from both in the US and abroad, and international visits to and collaborations with folks in Australia, Germany, India, Korea and China have been extremely useful in getting many of the researches accomplished. Last but not the least is the love, affection and selfless devotion of my beloved wife, Ratnaveni who accompanied me to all the trips and for putting up with me during my busy work at the university which allowed me to get things done appropriately. Thanks are due to Dr. Nilesh Kumar, post-doctoral research associate for suggestions and for redrawing some figures. Acknowledgements are due to the organizers of the honorary symposium in particular Prof. Indrajit Charit of the University of Idaho, and all participants who made presentations at the TMS annual meeting and contributed technical papers to the monograph.
- 4.K.L. Murty, E.O. Hall, in Dynamic Strain Aging and Neutron Irradiation in Mild Steel, Irradiation Effects on the Microstructure and Properties of Metals, vol. 53 (ASTM STP 611, 1976)Google Scholar
- 8.K.L. Murty, I. Turlik, Deformation mechanisms in PbSn alloys: application to solder reliability in electronic packaging, in ASME & JSME Joint Conference on Electronic Packaging, 9–12 Apr 1992, San Jose (see also “R. Darveaux, I. Turlik, K.L. Murty, Predictive thermal and mechanical modeling applied to the MCNC multichip module. J. Metals, 36–41, July1992”)Google Scholar
- 9.R.K. Mahidhara, et al., Deformation and fracture behavior of Sn-5%Sb solder. Scripta Met. 31(9), 1145–1150 (1994) (see also T. Shrestha, S. Gollapudi, I. Charit, K.L. Murty, Creep deformation behavior of Sn-Zn solder alloys. J. Mater. Sci. 49:2127–2135 (2014)Google Scholar
- 11.B. Kombaiah, K. Linga Murty, Coble, Orowan strengthening, and dislocation climb mechanisms in a Nb-modified Zircaloy cladding. Met. Mat. Trans. A 46, 4646–4660 (2015)Google Scholar
- 12.B. Kombaiah, K. Linga Murty, High temperature creep and deformation microstructures in recrystallized Zircaloy-4. Phil. Mag. A 95, 1656–1679 (2015)Google Scholar
- 13.K.L. Murty, Zircaloy life-prediction and new generation Zircaloys for LWRs. Trans. Ind. Inst. Metals 50, 533–562 (1997) (see also Y. Zhou, B. Devarajan, K.L. Murty, Short-term rupture studies of Zircaloy-4 and Nb-modified Zircaloy-4 tubing using closed-end internal pressurization. Nucl. Eng. Design 228, 3–13 (2004)Google Scholar
- 14.K. L. Murty, Internal pressurization creep of thin-walled tubing of Zr-alloys for dry storage feasibility of nuclear spent fuel. J. Metals, 34–38 (Sep. 2000)Google Scholar
- 16.K.L. Murty, Is neutron radiation exposure always detrimental to metals (steels)? Nature 308, 51 (1984)Google Scholar
- 19.K.L. Murty, O. Kanert, Dislocation jump distances during creep of pure and doped nacl single crystals using nuclear magnetic resonance pulse techniques. J. Appl. Phys. 67, 2866–2872 (1990)Google Scholar
- 22.F.M. Haggag, Field indentation microprobe for structural integrity evaluation, US Patent No. 4 852 397, 1989Google Scholar
- 25.W. Mohamed, et al., The role of grain size on neutron irradiation response of nanocrystalline copper. Materials 9, 144, 1–23 (2016). doi: 10.3390/ma9030144