• Y.Todaka[oral], M.Umemoto, A.Yamazaki, J.Sasaki, K.Tsuchiya
  "The effect of HPT-straining condition on the microstructure evolution and mechanical properties of pure Ti", Ti-2007 The 11th World Conference on Titanium (JIMIC-5), (2007.6)
  
  
• Y.Todaka[oral], M.Umemoto, J.Li, A.Yamazaki, C.Wang, J.Sasaki, K.Tsuchiya
  "Formation of nanocrystalline structure in metals by severe plastic deformation", TMS (Materials Science & Technology) 2007, 136th Annual Meeting & Exhibition, (2007.2)
  
  
• M.Umemoto[oral], Y.Todaka, J.Li, K.Tsuchiya
  "Strengthening and grain refinement in steels by severe plastic deformation", International Symposium on Metastable and Nano Materials (ISMANAM-2006), Journal of Alloys and Compounds, (2006.8)
  
  
• M.Umemoto[oral], Y.Todaka, J.Li, K.Tsuchiya
  "Formation of nanocrystalline ferrite in steels by severe plastic deformation", The 3rd International Conference on Advanced Structural Steels (ICASS-2006), (2006.8)
  
  
• M.Umemoto[oral], Y.Todaka, J.Li, K.Tsuchiya
  "Role of Strain Gradient and Dynamic Transformation on the Formation of Nanocrystalliine Structure Produced by Severe Plastic Deformation", International Conference on Processing & Manufacturing of Advanced Materials (THERMEC’ 2006), Materials Science Forum, Vols.539-543 pp.2787-2792, (2006.7)
  
  
• Y.Todaka[oral], M.Umemoto, Y.Watanabe and K.Tsuchiya
  "Formation of nanocrystalline structure by shot peening", International Conference on Nanomaterials by Severe Plastic Deformation, (NanoSPD3), Materials Science Forum, Vols.503-504, pp.669-674, (2005.9)
  
  
• M.Umemoto, Y.Todaka[oral], A.Ohno, M.Suzuki and K.Tsuchiya
  "Dissolution of cementite in carbon steels by heavy deformation and laser heat treatment", International Conference on Nanomaterials by Severe Plastic Deformation, (NanoSPD3), Materials Science Forum, Vols.503-504, pp.461-466, (2005.9)
  
  
• M.Umemoto[oral], Y.Todaka, J.Li and K.Tsuchiya
  "Nanocrystalline structure in steels produced by various severe plastic deformation processes", International Conference on Nanomaterials by Severe Plastic Deformation, (NanoSPD3), Materials Science Forum, Vols.503-504, pp.11-18, (2005.9)
  
  
• Y.Todaka[oral], M.Umemoto, J.Li and K.Tsuchiya
  "Formation of nanocrystalline structure by various severe plastic deformation processes", International Symposium on Physics of Materials, (ISPMA10), “Materials Science and Engineering A” in press, (2005.8)
  
  
• Y.Todaka, M.Umemoto[poater], A.Ohno, M.Suzuki Y.Kawabata and K.Tsuchiya
  "Dissolution of cementite in carbon steels by ball drop deformation and laser heating", International Symposium on Metastable and Nano Materials, (ISMANAM-2005), “Journal of alloys and compounds” in press, (2005.7)
  
  
• J.Li, M.Umemoto[oral], Y.Todaka and K.Tsuchiya
  "Role of strain gradient on the formation of nanocrystalline structure produced by severe plastic deformation", International Symposium on Metastable and Nano Materials, (ISMANAM-2005), “Journal of alloys and compounds” in press, (2005.7)
  
  
• Y.Todaka[oral], M.Umemoto and K.Tsuchiya
  "Nanocrystallization of carbon steels by shot peening and drilling", International Conference Nanomaterials and Nanotechnologies, (NN 2005), Reviews on Advanced Materials Science, Vol.10, pp.409-416, (2005.6)
  
  
• Y.Todaka[oral], M.Umemoto, J.Li and K.Tsuchiya
  "Nanocrystallization of drill hole surface by high speed drilling", International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials, (ISMANAM-2004), Journal of Metastable and Nanocrystalline Materials, Vols.24-25, pp.601-604, (2004.8)
  
  
• M.Umemoto[oral], Y.Todaka, Y.Watanabe, J.Li and K.Tsuchiya
  "Comparison of nanocrystallization in steels by ball milling, shot peening and drilling", International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials, (ISMANAM-2004), Journal of Metastable and Nanocrystalline Materials, Vols.24-25, pp.571-576, (2004.8)
  
  
• Y.Todaka[poster], M.Umemoto, Y.Watanabe and K.Tsuchiya
  "Nanocrystallization of steels by shot peening and particle impact deformation", International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials, (ISMANAM-2004), Journal of Metastable and Nanocrystalline Materials, Vols.24-25, pp.471-474, (2004.8)
  
  
• M.Umemoto[poster], Y.Todaka, M.Suzuki, E.Hernandez-Ferreiro and K.Tsuchiya
  "Dissolution of cementite by severe plastic deformation", International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials, (ISMANAM-2004), Journal of Metastable and Nanocrystalline Materials, Vols.24-25, pp.157-160, (2004.8)
  
  
• M.Umemoto[poster], Y.Todaka and K.Tsuchiya
  "Nanocrystallization of steels by various severe plastic deformation", Materials Science & Technology 2003 Conference, (TMS), Proceeding of “Processing and Properties of Structural Nanomaterials”, pp.125-132, (2003.11)
  
  
• Y.Todaka[poster], M.Umemoto and K.Tsuchiya
  "Nanocrystallization of steels by severe plastic deformation", 2nd International Symposium on Ultrafine Grained Structures, (ISUGS 2003), (2003.11)
  
  
• Y.Todaka[oral], M.Umemoto, Y.Watanabe and K.Tsuchiya
  "Formation of nanocrystalline structure in steels by air blast shot peening and particle impact processing", 3rd International Symposium on Designing, Processing and Properties of Advanced Engineering Materials, (ISAEM-2003), Materials Science Forum, Vols.449-452, pp.1149-1152, (2003.11)
  
  
• Y.Todaka[oral], M.Umemoto, Y.Watanabe and K.Tsuchiya
  "Nanocrystallization in steels by air blast shot peening", The 8th IUMRS International Conference on Advanced Materials, (IUMRS-ICAM 2003), Transactions of the Materials Research Society of Japan, Vol.29, No.8, pp.3525-3528, (2003.10)
  
  
• Y.Todaka[oral,poster], M.Umemoto and K.Tsuchiya
  "Nanocrystallization in carbon steels by various severe plastic deformation processes", 2nd International Conference on Nanomaterials by Severe Plastic Deformation, Fundamentals - Processing - Applications, (nanoSPD2), Proceedings of the Conference "Nanomaterials by Severe Plastic Deformation - NANOSPD2", pp.505-510, (2002.12)
  
  
• M.Umemoto[oral], Y.Todaka, T.Yasuda and K.Tsuchiya
  "Comparison of nanocrystallization in steels by ball milling and ball drop test", International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials, (ISMANAM-2002), Journal of Metastable and Nanocrystalline Materials, Vols.15-16, pp.193-198, (2002.9)
  
  
• M.Umemoto[oral], Y.Todaka and K.Tsuchiya
  "Nanocrystalline structure in Fe-C alloys produced by ball milling and ball drop test", International Symposium on Rapidly Quenched and Metastable Materials, (RQ11), Materials Science and Engineering A, Vols.375-377, pp. 899-904, (2002.8)
  
  
• Y.Todaka[oral], M.Umemoto and K.Tsuchiya
  "Nanocrystallization in Fe-C alloys by ball milling and ball drop test", First International Conference on Advanced Structural Steels, (ICASS 2002), ISIJ International, Vol.42, No.12, pp.1429-1436, (2002.5)