Papers by Author: Minoru Umemoto

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Authors: Koichi Tsuchiya, O. Kawabata, Minoru Umemoto, H. Sato, K. Marukawa
469
Authors: Minoru Umemoto, Zhi Guang Liu, K. Masuyama, Koichi Tsuchiya
93
Authors: Minoru Umemoto, Zhi Guang Liu, D.Y. Liu, H. Takaoka, Koichi Tsuchiya
199
Authors: Minoru Umemoto, Yoshikazu Todaka, T. Takahashi, P. Li, R. Tokumiya, Koichi Tsuchiya
607
Authors: L. Diaz Barriga Arceo, J.J. Cruz-Rivera, J. Gerardo Cabañas-Moreno, Koichi Tsuchiya, Minoru Umemoto, H.A. Calderón
641
Authors: O. Coreño Alonso, J. Gerardo Cabañas-Moreno, J.J. Cruz-Rivera, H.A. Calderón, Minoru Umemoto, Koichi Tsuchiya, S. Quintana-Molina, C. Falcony
635
Authors: Minoru Umemoto, Yoshikazu Todaka, Tadashi Yasuda, Koichi Tsuchiya
193
Authors: Minoru Umemoto, Yoshikazu Todaka, Yukinori Watanabe, Jin Guo Li, Koichi Tsuchiya
571
Authors: J.C. Aguilar-Virgen, A.F. Cabrera, Minoru Umemoto, H.A. Calderón
Abstract: The mechanical behavior of the sintered nanostructured intermetallic alloys, Al67Ti25Mn8 and Al67Ti25Fe8 has been investigated by means of compression tests as a function of temperature. These intermetallic materials are produced by mechanical alloying and spark plasma sintering. The sintered alloys have been characterized by X-Ray Diffraction and Transmission Electron Microscopy. Their nanostructure consists of a single-phase with an L12 (cubic) structure and an average grain size in the nanoscale (lower than 30 nm). These nanostructured intermetallics show considerably high ductility in compression at high temperature but are brittle at temperatures below 400 °C. In such cases the compressive fracture strength can reach values as high as 1.8 GPa (Al67Ti25Fe8). At 500 °C, some ductility is found together with a relatively high flow stress (around 1 GPa), the corresponding deformation curve shows strain hardening and in some cases stress serrations (strain aging). At 600 °C, a low flow stress is measured (~300 MPa) with high ductility. At 700 and 800 °C, a quasi-superplastic behavior is found with a total deformation of around 45 and very low flow stresses. No evidence of dislocation motion is found at temperatures above 700 °C suggesting a deformation mechanism based on grain boundary sliding.
63
Authors: T. Itsukaichi, S. Shiga, K. Masuyama, Minoru Umemoto, I. Okane
631
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