| 1. |
B.R. Anne, T. Morikawa, M. Tanaka, Temperature Dependence of Fatigue Crack Propagation in Ti-6al-4v at Different Stress Ratios, 日本金属学会2020年秋季（第167回）講演大会, 2020.09. |
| 2. |
M. Tanaka, K. Higashida, Thermally activated process of dislocation glide at low temperatures in severely deformed Ti-added ultralow-carbon steels, International symposium on atomistic processes of crystal plasticity (APCP2018), 2018.10. |
| 3. |
M. Tanaka, Y. Okuyama, K. Higashida, T. Manabe, Delamination cracks in wire-drawn fully pearlitic steels, The 9th International Conference on Multiscale Materials Modeling (MMM2018), 2018.10. |
| 4. |
Yelm Okuyama, Masaki Tanaka, Tetsuya Ohashi, The effect of microscopic slip deformation on the yield stress in dispersion hardened alloys analyzed by using crystal plasticity FEM, The 9th International Conference on Multiscale Materials Modeling (MMM2018), 2018.10. |
| 5. |
Bhargavi Rani Anne, Masaki Tanaka, Temperature dependence of fatigue crack growth in Ti-6Al- 4V, The 9th International Conference on Multiscale Materials Modeling (MMM2018), 2018.10. |
| 6. |
Yelm Okuyama, Masaki Tanaka, Tetsuya Ohashi, Tatsuya Morikawa, Crystal plasticity analysis of α-Ti polycrystalline with Temperature dependence of the yield stress, International Conference on PROCESSING & MANUFACTURING OF ADVANCED MATERIALS. Processing, Fabrication, Properties, Applications (THERMEC’ 2018), 2018.07. |
| 7. |
Masaki Tanaka, Yelm Okuyama, Tatsuya Morikawa, Temperature dependence of proof stress and fatigue crack growth rate in Ti-0.49O, International Conference on PROCESSING & MANUFACTURING OF ADVANCED MATERIALS. Processing, Fabrication, Properties, Applications (THERMEC’ 2018), 2018.07. |
| 8. |
Bhargavi Rani Anne, Masaki Tanaka, Temperature dependence of mechanical properties in dual phase Ti-6Al-4V, International Conference on PROCESSING & MANUFACTURING OF ADVANCED MATERIALS. Processing, Fabrication, Properties, Applications (THERMEC’ 2018), 2018.07. |
| 9. |
Ryoma Kato, Tatsuya Morikawa, Masaki Tanaka, Strain distribution due to martensitic transformation in Fe-Ni alloy under hydrogen influence, 日本顕微学会第60回記念シンポジウム, 2017.12. |
| 10. |
Masaki Tanaka, Tatsuya Morikawa, Kenji Higashida, Thermally activated process of dislocation gliding at low temperatures in severely deformed metals, The 15th International Conference on Advanced Materials, 2017.08. |
| 11. |
Chatcharit Kiattisaksri, 竹田祐治, Masatoshi Aramaki, 古君 修, 田中 將己, Ductile fracture behavior of single crystal pure iron during tensile test, 日本鉄鋼協会172回秋季講演大会, 2016.09. |
| 12. |
田中 將己, 東田 賢二, Low temperature toughness and dislocation mobility in bulk nanostructured metals, 4th ESISM (elements strategy initistive for structual materials) workshop in Kyoto "Fundsmental Issue of Structual Materials", 2016.01. |
| 13. |
田中 將己, 東田 賢二, Understanding fracture toughness based on dislocation behaviors, Asia Steel International Conference (Asia Steel 2015), 2015.10. |
| 14. |
N. Yoshimura, M. Tanaka, H. Shirahata, G. Shigesato, K. Ushioda, R. Uemori, K. Higashida, Effect of Solute Ni and Mn on Brittle Fracture of Ultra Low Carbon Steels, Cogress and Exhibition on Advanced Materials and Processes (EUROMAT2015), 2015.09. |
| 15. |
Masaki Tanaka, Kenji Higashida, Dislocation mobility and low temperature toughness of buok nanostructured metals, The 2nd International Workshop on Bulk Nanostructured Metals, 2015.08. |
| 16. |
Tomotsugu Shimokawa, Tomohiro Tsuru, Yoshiteru Aoyagi, Masaki Tanaka, Kenji Higashida, Influence of Grain Boundary Dislocation Sources on Mechanical Properties of Nanostructured Metals: A Molecular Dynamics Study, The 2nd International Workshop on Bulk Nanostructured Metals, 2015.08. |
| 17. |
Masaki Tanaka, Kenji Higashida, HVEM-tomography for crack tip dislocations, 17th International Conference on the Stregth of Materials (ICSMA17), 2015.08, Brittle failure is one of the most catastrophic failure mechanisms operating in crystalline materials as it occurs very rapidly. While materials with a BCC structure or covalent bonding are especially susceptible, they typically fail in a brittle fashion only at low temperatures. Early investigations that sought to elucidate the mechanism behind this brittle to ductile transition, BDT, were performed using silicon single crystals as these can be grown dislocations free, the properties of dislocations in Si are well characterized, and the transition occurs over a narrow temperature window. One explanation for the transition is based on dislocation shielding, in which the stress field of the dislocations emitted from the crack accommodates the crack tip stress intensity. The amount accommodated is dependent not only on the Burgers vector of the emitted dislocations but also on the dislocation distribution around the crack tip. To discover the controlling mechanisms behind the BDT, knowledge of the three-dimensional spatial distribution of each type of dislocation is required.
A technique to visualize the spatial distribution of such dislocations is electron tomography. In order to acquire the images necessary for the reconstruction, the increased penetration power of a high-voltage electron microscope (HVEM) enables thicker samples to be viewed, which is useful for imaging at high tilt angles; in the case of silicon, the sample thickness can be several micrometres. In the present study, the Burgers vectors and spatial arrangement of the dislocations surrounding a crack tip in Si were characterized by combining HVEM-tomography with conventional g.b analysis. Using this information, the local stress intensity factor was calculated and a multiplication process for generating dislocation sources around a crack tip was proposed.
P-type (001) silicon wafers that are commercially available were used in this study.. |
| 18. |
Kana Yamada, Ｒｉｎｔｒｏ Kamohara, Daichi Izumi, Kosuke Takata, Masaki Tanaka, Mechanical Property of Micro-pillars in Iron Single Crystals, he 11th International Nanotechnology Conference on Communication and Cooperation (INC11), 2015.05. |
| 19. |
Damar Rastri Adhika, Masaki Tanaka, Takeshi Daio, Kenji Higashida, Crack tip shielding effect observed with HRTEM, The 9th Postech-KIMS-SNU-Kyushu University Symposium, 2015.01. |
| 20. |
Damar Rastri Adhika, Masaki Tanaka, Takeshi Daio, Kenji Higashida, Crack-tip dislocations characterised with HVEM tomography, Opening International Symposium, Nex-Generation Microscopic Science, 2014.11. |
| 21. |
Kenji Higashida, Masaki Tanaka, Toward connecting dislocation behaviours with materials fracture, The 4th International Symposium on Steel Science (ISSS2014), 2014.11. |
| 22. |
Masaki Tanaka, Kenji Higashida, Multiplication process of crack tip dislocations revealed with HVEM-tomography, The International Union of Materials Research Societies - International Conference in Asia 2013 (IUMRS-ICA-2013), 2013.12. |
| 23. |
Thiti Sirithanakorn, Masaki Tanaka, K. Higashida, Two steps brittle-to-ductile transition in pearlite, International Conference on Processing & Manufacturing of Advanced Materials (THERMEC 2013), 2013.12. |
| 24. |
Damar Adhika, 田中 將己, 山本 知一, 東田 賢二, Strain field around dislocations in silicon mesured by GPA, 第55回日本顕微鏡学会九州支部学術講演会, 2013.12. |
| 25. |
Masaki Tanaka, Kenji Higashida, Crack-tip dislocations characterised with HVEM tomography, Electron Microscopy & Multiscale Modeling 2013 (EMMM2013), 2013.11. |
| 26. |
Tomotsugu Shimokawa, Masaki Tanaka, Kenji Higashida, Tetsuya Ohashi, A multiscale approach for investigation the ductility of pearlitic steel, KIM-JIM Symposium, 2013 Autumn Meeting of The Japan Institue of Metals and Materials, 2013.09. |
| 27. |
Masaki Tanaka, Shunsaku Takano, Kenji Higashida, Brittle-to-ductile transition in bulk nanostructured steels, KIM-JIM Symposium, 2013 Autumn Meeting of The Japan Institue of Metals and Materials, 2013.09. |
| 28. |
Masaki Tanaka, Kenji Higashida, 3D Structure of Crack Tip Dislocations Elucidated with Electron Tomography and their Effects on Toughness, The 8th Pacific RIM International Congress on Advanced Materials and Processing (PRICM8), 2013.08. |
| 29. |
Kentaro Hata, Masaki Tanaka, Nobuyuki Yoshimura, Kenji Higashida, Relation between a brittle-to-ductile transition twins in polycrystalline ferritic alloys, International Symposium on Strength of Fine Grained Materials - 60 years of Hall-Petch-, 2013.07. |
| 30. |
Masaki Tanaka, Kenji Higashida, Enhancement of toughness at low temperatures using grain refinements, International Symposium on Strength of Fine Grained Materials - 60 years of Hall-Petch-, 2013.07. |
| 31. |
Kenji Higashida, Masaki Tanaka, Shunsaku Takano, Tomotsugu Shimokawa, Effect of grain refinement due to severe plastic deformation on the brittle-to-ductile transition in low carbon steels, International Symposium on Strength of Fine Grained Materials - 60 years of Hall-Petch-, 2013.07. |
