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Papers by Author: Toshimasa Yoshiie

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Effect of Impurities on Vacancy Mobility in V-4Cr-4Ti

Authors: Qiu Xu, Toshimasa Yoshiie, Takuya Nagasaka, Takeo Muroga

Abstract: To investigate the effect of impurites, such as O, N and C, on migration behavior of vacancies in several types of V-4Cr-4Ti vanadium alloy with different amount of impurites from 207wppm to 866wppm were irradiated with 28 MeV electrons using an electron linear accelerator at 100 K. After irradiation, positron lifetime measurements were carried out. Single vacancies were produced in all samples. The vacancy clusters were formed at 348 K and 433 K in samples with lowest and highest impurites, respectively. The temperature forming vacancy clusters incresased with increaisng amount of impurites. The vacancy migaration is depended on the amount of impurities rather than the kind of impurity.

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Transmission Positron-Electron Microscopes

Authors: Masao Doyama, Yoshiaki Kogure, Miyoshi Inoue, Yoshihiko Hayashi, Toshimasa Yoshiie, Toshikazu Kurihara, Ryuichiro Oshima, Katsushige Tsuno

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Recovery Behavior of Defect Clusters in Fe-Cu Alloys Irradiated with Neutrons at High Temperature

Authors: Qiu Xu, Toshimasa Yoshiie

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Positron Lifetime Calculations of Defects in Nickel Containing Hydrogen at Various Temperatures

Authors: Troyo D. Troev, B. Shivachev, Toshimasa Yoshiie

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Comparison of Defect Structures in Fe-Cu Alloys by High-Speed and Low-Speed Deformation with the Detection of Cu Precipitates

Authors: T. Ishizaki, Toshimasa Yoshiie, Qiu Xu, K. Sato, Masao Komatsu

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The Effect of Hydrogen-Charging in Neutron Irradiated Nickel Studied by Positron Annihilation Lifetime Spectroscopy (PALS)

Authors: Chun Qing He, Qiu Xu, Toshimasa Yoshiie, Koichi Sato, Troyo D. Troev

105

A Transmission Positron Microscope and a Scanning Positron Microscope Being Built at KEK, Japan

Authors: Masao Doyama, M. Inoue, Yoshiaki Kogure, Toshikazu Kurihara, A. Yagishita, T. Shidara, K. Nakahara, Yoshikazu Hayashi, Toshimasa Yoshiie, Katsushige Tsuno

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Effect of Minor Elements on Microstructure Evolution in Ni Alloys Irradiated with Neutron

Authors: Qiu Xu, Toshimasa Yoshiie

170

Position Sensitive Detectors of Positrons - Imaging Plates -

Authors: Masao Doyama, J. Takano, M. Inoue, Toshimasa Yoshiie, Yoshikazu Hayashi, Michio Kiritani, Tadaaki Oikawa

790

Amorphization and Solid Phase Epitaxial Growth in Ion Implanted III-V Compound Semiconductors

Authors: M. Taniwaki, M. Yanaba, Toshimasa Yoshiie, Yasunori Hayashi

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