Reviews, Commentaries, etc. - Nii, Yoichi

21pGE-12 Magnetic shape memory effect induced by magnetic field rotation in MnV_2O_4 spinel oxide

Nii Y., Yagi T., Abe N., Taniguchi K., Sagayama H., Arima T.

Meeting abstracts of the Physical Society of Japan (The Physical Society of Japan (JPS))  65 ( 1 ) 628 - 628 2010.03

ISSN  1342-8349

23pWB-14 Single-crystal structure analysis of spinel oxide FeV_2O_4 using synchrotron radiation x-ray

Nii Y, Sagayama H, Arima T, Sakai R, Aoyagi S, Nishibori E, Sawa H, Sugimoto K, Ohsumi H, Takata M

Meeting Abstracts of the Physical Society of Japan (The Physical Society of Japan (JPS))  65 ( 0 ) 500 - 500 2010

ISSN  1342-8349

Effect of Nb content on plastic deformation behavior and deformation textures of Ti-Nb-Zr-Ta-O alloy

Yoichi Nii, Hee Young Kim, Shuichi Miyazaki

Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals 72 ( 12 ) 970 - 974 2008.12

ISSN  0021-4876

　View Summary

Recently developed β-Ti alloy Gum Metal is one of attractive materials for biomedical applications due to its excellent combination of low Young's modulus and high strength. Gum Metal also exhibits other unique properties such as non-linear elasticity, plastic deformation without work-hardening. These multifunctional properties in Gum Metal are quite intriguing characteristics not only for practical applications but also for fundamental studies. However the mechanism is not fully understood yet. In this research, in order to obtain new information for special plastic deformation behavior of Gum Metal, the deformation texture and microstructure of Ti-(19-29)Nb-2Zr-0.7Ta-1.2O alloys including typical composition of Gum Metal were investigated by XRD measurement and TEM observation. The major deformation texture of Ti-(21-29)Nb-2Zr-0.7Ta-1. 2O alloys was {001}〈110〉 type. However, the maximum orientation density I max in orientation distribution functions (ODFs) strongly depends on Nb content and the maximum value was obtained at Ti-23Nb-2Zr-0.7Ta-1. 2O, indicating that the strongest deformation texture was formed in Gum Metal composition. TEM observation implied that the strong deformation texture formation in Gum Metal is due to its unique deformation mechanism. © 2008 The Japan Institute of Metals.

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