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Takahito Ohmura

Researcher at National Institute for Materials Science

Publications -  129
Citations -  2120

Takahito Ohmura is an academic researcher from National Institute for Materials Science. The author has contributed to research in topics: Nanoindentation & Dislocation. The author has an hindex of 20, co-authored 108 publications receiving 1504 citations. Previous affiliations of Takahito Ohmura include Kyushu University.

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Journal ArticleDOI

Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy

Tsai-Fu Chung, +6 more
- 01 May 2018 - 
TL;DR: In this paper, high-resolution transmission electron microscopy (HRTEM) with nanometer-scaled energy-dispersive X-ray (EDX) was employed to investigate the transformation mechanisms of the GP zone → η′ → ∞ precipitation sequence of AA7050, an Al-Zn-Mg-Cu alloy.
Journal ArticleDOI

Dislocation grain boundary interactions in martensitic steel observed through in situ nanoindentation in a transmission electron microscope

Takahito Ohmura, +3 more
- 01 Dec 2004 - 
TL;DR: In this paper, two types of boundaries were imaged in the dislocated martensitic structure: a low-angle lath boundary and a coherent, high-angle (probable) block boundary.
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Nanohardness measurement of high-purity Fe-C martensite

Takahito Ohmura, +2 more
- 29 Oct 2001 - 
TL;DR: In this paper, the nanohardness of binary as-quenched martensitic steels was measured for four bcc single crystals using the nanoindentation technique.
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Evaluation of temper softening behavior of Fe-C binary martensitic steels by nanoindentation

Takahito Ohmura, +2 more
- 01 Dec 2003 - 
TL;DR: In this article, the temper softening behavior of Fe-C binary martensite with various carbon contents was considered by evaluating the matrix strength through nanoindentation, and the tempering temperature dependence of conventional micro-Vickers hardness shows a "hump" around 673 K.
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Effects of transformation temperature on VC interphase precipitation and resultant hardness in low-carbon steels

Yongjie Zhang, +6 more
- 01 Feb 2015 - 
TL;DR: In this paper, the effects of transformation temperature on VC interphase precipitation in low-carbon steels were investigated mainly by using an Fe-0.1C-1.5Mn alloy isothermally transformed at different temperatures.