Solid Mechanics and Metal Forming Laboratory » Publications

Publications

Journal Publications: 

  1. El-Atwani, E. Esquivel, M. Efe, E. Aydogan, Y.Q. Wang, E. Martinez, S.A. Maloy, “Loop and void damage during heavy ion irradiation on nanocrystalline and coarse grained tungsten: Microstructure, effect of dpa rate, temperature, and grain size,” Acta Materialia, 149, 2018, p206-219..
  1. El-Atwani, E. Aydogan, E. Esquivel, M. Efe, Y.Q. Wang, S.A. Maloy, “Detailed transmission electron microscopy study on the mechanism of dislocation loop rafting in tungsten,” Acta Materialia, 147, 2018, p277-283.
  1. Atik, M. Efe, “Twinning-induced shear banding and its control in rolling of magnesium,” Material Science and Engineering A, 2018. (corresponding author) 
  1. Güler, M. Efe, “Forming and fracture limits of sheet metals deforming without a local neck,” Journal of Materials Processing Technology, 252, 2018, p477-484. (corresponding author) 
  1. S. Cunningham, J.M. Gentile, O. El-Atwani, C.N. Taylor, M. Efe, S.A. Maloy, J.R. Trelewicz, “Softening due to Grain Boundary Cavity Formation and its Competition with Hardening in Helium Implanted Nanocrystalline Tungsten,” Scientific Reports, 8, 2018, p2897. 
  1. Bayramin, C. Simsir, M. Efe, “Dynamic strain aging in DP steels at forming relevant strain rates and temperatures,” Material Science and Engineering A, 704, 2017, p164-172. (corresponding author)
  1. Seymen, B. Guler, M. Efe, “Large strain and small-scale biaxial testing of sheet metals,” Experimental Mechanics, 56, 2016, p1519-1530. (corresponding author)
  1. Sagapuram, M. Efe, K.P. Trumble, S. Chandrasekar, “Flow transitions and flow localization in large-strain deformation of magnesium alloy,” Materials Science and Engineering: A, 659, 2016, p295-305.
  1. El-Atwani, S. Gonderman, S. Suslov, M. Efe, G. De Temmerman, T. Morgan, K. Bystrov, K. Hattar, J.P. Allain, “Early stage damage of ultrafine-grained tungsten materials exposed to low energy helium ion irradiation,” Fusion Engineering and Design, 93, 2015, 9-14.
  1. El-Atwani, A. Suslova, T.J. Novakowski, K. Hattar, M. Efe, S.S. Harilal, A. Hassanein, “In-situ TEM/heavy ion irradiation on ultrafine-and nanocrystalline-grained tungsten: Effect of 3MeV Si, Cu and W ions,” Materials Characterization, 99, 2015, 68-76.
  1. El-Atwani, S. Gonderman, M. Efe, G. De Temmerman, T. Morgan, K. Bystrov, D.R. Klenosky, T. Qiu, J.P. Allain, “Ultrafine tungsten as a plasma-facing component in fusion devices: effect of high flux, high fluence low energy helium irradiation,” Nuclear Fusion, 54, 2014, 083013.
  1. El-Atwani, J. A. Hinks, G. Greaves, S. Gonderman, T. Qiu, M. Efe, J.P. Allain, “In-situ TEM observation of the response of ultrafine- and nanocrystalline-grained tungsten to extreme irradiation environments,” Scientific Reports, 4, 2014, 4716.
  1. Efe, O. El-Atwani, Y. Guo, D.R. Klenosky, “Microstructure Refinement of Tungsten by Surface Deformation for Irradiation Damage Resistance,” Scripta Materialia, 70, 2014, p31-34. (corresponding author) 
  1. Sagapuram, M. Efe, W. Moscoso, K.P. Trumble, S. Chandrasekar, “Controlling Texture in Magnesium Alloy Sheet by Shear-based Deformation Processing,” Acta Materialia, 61, 2013, p6843-6856. 
  1. El-Atwani, M. Efe, B. Heim, J.P. Allain, “Surface damage in ultrafine and multimodal grained tungsten materials induced by low energy helium irradiation,” Journal of Nuclear Materials, 434, March 2013, p170-177. 
  1. Efe, HJ. Kim, S. Chandrasekar, K.P. Trumble, “The chemical state and control of oxygen in powder metallurgy tantalum,” Material Science and Engineering A, 544, May 2012, p1-9.
  1. Efe, W. Moscoso, K.P. Trumble, W.D. Compton, S. Chandrasekar, “Mechanics of Large Strain Extrusion Machining and Application to Deformation Processing of Magnesium Alloys,” Acta Materialia, 60, March 2012, p2031-2042.
  1. Guo, M. Efe, W. Moscoso, D. Sagapuram, K. P. Trumble and S. Chandrasekar, “Deformation field in large strain extrusion machining and implications for deformation processing”, Scripta Materialia, 66-5, March 2012, p235-238.
  1. El-Atwani, D.V. Quach, M. Efe, P.R. Cantwell, B. Heim, B. Schultz, E.A. Stach, J.R. Groza, J.P. Allain, “Multimodal grain size distribution and high hardness in fine grained tungsten fabricated by spark plasma sintering,” Materials Science and Engineering: A, 528, July 2011, p5670-5677.

Patent Applications:

  1. Chandrasekar, K.P. Trumble, W. Moscoso, M. Efe, D. Sagapuram, C.J. Saldana, J.B. Mann, W.D. Compton, “Large-Strain Extrusion Machining Processes and Bulk Forms Produced Therefrom”, US Patent 9,687,895, Issued on: 27/6/2017

Conference Publications:

  1. Güler, M. Efe, “Large strain cruciform biaxial testing for FLC detection,” AIP Conference Proceedings 1896 (1), 020018, 2017.
  1. Şimşir, B. Çetin, M. Efe, K. Davut, B. Bayramin, “A Material Perspective on Consequence of Deformation Heating During Stamping of DP Steels,” Journal of Physics: Conference Series 896 (1), 012059, 2017.
  1. Guler, K. Alkan, M. Efe, “Formability analysis of sheet metals by cruciform testing,” Journal of Physics: Conference Series 896 (1), 012003, 2017.
  1. Guler, Y. Seymen, M. Efe, “A Portable Biaxial Test Apparatus for In-Situ Formability Analysis of Sheet Samples,” 17th International Conference on Experimental Mechanics (ICEM 17), 2016
  1. Guler, Y. Seymen, M. Efe, “A Comparison of Cruciform Designs for Sheet Metal Testing,”Proceedings of the 2nd International Conference on Metal Forming (METFORM-2014), 2014
  1. Hattar, O. El-Atwani, M. Efe, T.J. Novakowski, A. Suslova, J.P. Allain, “Helium Implantation of Ultrafine Grained Tungsten within a TEM,” MRS Proceedings, 1645, 2014.
  1. Sagapuram, M. Efe, W. Moscoso, K.P. Trumble, S. Chandrasekar, “Enabling shear textures and fine-grained structures in Magnesium sheet by machining-based deformation processing,” IOP Conference Series: Materials Science and Engineering, 63, 2014, 012155.
  1. C. Gracia-Gonzales, D. Sagapuram, M. Efe, S. Chandrasekar, W. Moscoso, “Steel Strips Made Directly from Bulk Material by Large Strain Extrusion Machining,” in: Proceedings of the 12th LACCEI Latin American and Caribbean Conference for Engineering and Technology (LACCEI’2014), Guayaquil, Ecuador, July 2014.
  1. Sagapuram, M. Efe, W. Moscoso, S. Chandrasekar, K.P. Trumble. “Non‐Basal Textures in Magnesium Alloy Strips by Extrusion‐Machining.” Magnesium Technology 2012, p121-125, 2012, Magnesium Technology Best Student Paper Award
  1. Sagapuram, M. Efe, W. Moscoso, S. Chandrasekar, K.P. Trumble, “Deformation Temperature Effects on Microstructure and Texture Evolution in High Strain Rate Extrusion-Machining of Mg-AZ31B,” Material Science Forum, Vol. 702-703, 2011, p52.
  1. Efe, H.J. Kim, S. Chandrasekar, K.P. Trumble, “Hot-Pressing of Ultrafine Grained Tantalum Powders Produced from Machining Chips”, in: Proceedings of the 2009 International Conference on Powder Metallurgy & Particulate Materials, MPIF, Princeton, NJ, p8-87:8-96, June 2009.

Workshops and Conference Presentations:

  1. Sagapuram, M. Efe, C. Akatay, “An In-Situ TEM Study of the Thermal Response of Ultrafine-Grained Magnesium,” Presentation at TMS 2015, March 2015
  1. Efe, O. El-Atwani, “Advanced Materials for Future Nuclear Energy Technologies,” Presentation at 3rd International Workshop on Physics Based Material Models and Experimental Observations, Çeşme, Turkey, June 2014
  1. Efe (organizer), Plasticity Theory of Materials Workshop, Pontificia Universidad Católica Madre y Maestra (PUCMM), Dominican Republic, June 2013 
  1. Efe, D. Sagapuram, W. Moscoso, S. Chandrasekar, K.P. Trumble, “Effects of High Strain Rate and Low Deformation Temperature on Shear Banding and Microstructure in Magnesium Sheet Processing,” Presentation at International Conference on Plasticity, Nassau, The Bahamas, January 2013
  1. El-Atwani, S. Gonderman, M. Efe ,G. DeTemmerman, T. Morgan, K. Bystrov, D. Klenosky, T. Qiu, J.P. Allain, “Ultrafine and Fine Grained Tungsten of Multimodal Grain Size Distribution Prepared by Spark Plasma Sintering and Severe Plastic Deformation as Radiation Tolerant Materials for Nuclear Fusion Reactors,” Materials Research Society (MRS) Fall Meeting, Boston, MA, USA, December 2012
  1. El-Atwani, J. Hinks, G. Greaves, M. Efe, S. Gonderman, J.P. Allain, “In-situ Irradiation-transmission Electron Microscopy (TEM) Experiments on Ultrafine Grained Tungsten Materials Prepared by Severe Plastic Deformation,” Materials Research Society (MRS) Fall Meeting, Boston, MA, USA, December 2012
  1. Efe, D. Sagapuram, W. Moscoso, S. Chandrasekar, K.P. Trumble, “Understanding the Ultrafine Grain Formation and Recrystallization Mechanisms in Magnesium through Extrusion-Machining,” Presentation at TMS 2012, Orlando, FL, March 2012, TMS Young Scientist Silver Medal 
  1. Efe, W. Moscoso, W.D. Compton, K.P. Trumble, S. Chandrasekar, “Direct Production of Sheet from Alloys of Limited Workability Using Machining-Based Processes,” Presentation at TMS 2011, San Diego, CA, March 2011
  1. Efe, W. Moscoso, S. Chandrasekar, K.P. Trumble, “Production of Magnesium AZ31B Foils by a Machining-Based Processes”, Presentation at MS&T 2009, Pittsburgh, PA, October 2009
  1. Efe, H.J. Kim, W. Moscoso, W.D. Compton, S. Chandrasekar, K.P. Trumble, “Heavily Deformed Tantalum Plates by Linear Extrusion Machining”, Poster Presentation at TMS Annual Meeting, New Orleans, LA, March 2008

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