Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Hiromi Miura is active.

Publication


Featured researches published by Hiromi Miura.


Materials Science Forum | 2018

High Cycle Fatigue Properties of Multi-Directionally Forged Commercial Purity Grade 2 Ti Plate

Ilhamdi; Toshifumi Kakiuchi; Hiromi Miura; Yoshihiko Uematsu

Tension-tension fatigue tests were conducted using ultrafine-grained commercially pure Titanium (Ti) plates fabricated by multi-directional forging (MDFing). The MDFed pure Ti plates with the thickness of 1 mm were developed aiming at dental implant application. The fatigue properties of MDFed pure Ti plates were superior to those of the conventional rolled pure Ti plates. The higher fatigue strengths in MDFed plates could be attributed to the much finer grains evolved by MDFing. Fatigue crack initiated from specimen surface, when number of cycles to failure was shorter than 106 cycles. In the high cycle fatigue (HCF) region, however, subsurface crack initiation with typical fish-eye feature was recognized in the MDFed pure Ti plate in spite of the thin thickness. Fractographic analyses revealed that no inclusion existed at the center of fish-eye. The subsurface crack initiation mechanism could be related to the inhomogeneity of microstructure with some coarse grains in the inner part of the plate.


IOP Conference Series: Materials Science and Engineering | 2015

Non-destructive and three-dimensional measurement of local strain development during tensile deformation in an aluminium alloy

Masakazu Kobayashi; Hiromi Miura; Hiroyuki Toda

Anisotropy of mechanical responses depending on crystallographic orientation causes inhomogeneous deformation on the mesoscopic scale (grain size scale). Investigation of the local plastic strain development is important for discussing recrystallization mechanisms, because the sites with higher local plastic strain may act as potential nucleation sites for recrystallization. Recently, high-resolution X-ray tomography, which is non-destructive inspection method, has been utilized for observation of the materials structure. In synchrotron radiation X-ray tomography, more than 10,000 microstructural features, like precipitates, dispersions, compounds and hydrogen pores, can be observed in aluminium alloys. We have proposed employing these microstructural features as marker gauges to measure local strains, and then have developed a method to calculate the three-dimensional strain distribution by tracking the microstructural features. In this study, we report the development of local plastic strain as a function of the grain microstructure in an aluminium alloy by means of this three-dimensional strain measurement technique. Strongly heterogeneous strain development was observed during tensile loading to 30%. In other words, some parts of the sample deform little whereas another deforms a lot. However, strain in the whole specimen was keeping harmony. Comparing the microstructure with the strain concentration that is obtained by this method has a potential to reveal potential nucleation sites of recrystallization.


Scripta Materialia | 2017

Heterogeneous nanostructure developed in heavily cold-rolled stainless steels and the specific mechanical properties

Hiromi Miura; Masakazu Kobayashi; Yoshikazu Todaka; Chihiro Watanabe; Yoshiteru Aoyagi; N. Sugiura; Naoki Yoshinaga


Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2017

Effects of aging on mechanical properties and microstructure of multi-directionally forged 7075 aluminum alloy

Tomoya Aoba; Masakazu Kobayashi; Hiromi Miura


Procedia Engineering | 2014

Room-temperature Multi-directional Forging of AZ80Mg Alloy to Induce Ultrafine Grained Structure and Specific Mechanical Properties

Hiromi Miura; Wataru Nakamura; Masakazu Kobayashi


Materials Transactions | 2016

Effect of Grain Size on Fatigue Behavior in AZ61 Mg Alloys Fabricated by MDFing

Yoshihiko Uematsu; Toshifumi Kakiuchi; Hiromi Miura; Taishi Nozaki


Materials Transactions | 2016

Effects of Strain Rate during Multi-Directional Forging on Grain Refinement and Mechanical Properties of AZ80Mg Alloy

Hiromi Miura; Masakazu Kobayashi; T. Benjanarasuth


Procedia Engineering | 2014

Measurement of local plastic deformation in aluminum alloy by means of X-ray 3D imaging technique

Masakazu Kobayashi; Yuuki Kawamura; Soutaro Ueno; Hiroyuki Toda; Hiromi Miura


Journal of Japan Institute of Light Metals | 2014

Simulation of deformation texture evolution in aluminum alloy based on local strain obtained by synchrotron 3D measurement

Aya Kouno; Masakazu Kobayashi; Hiroyuki Toda; Hiromi Miura


Materials Transactions | 2018

Fatigue Behavior of Multi-Directionally Forged Commercial Purity Grade 2 Ti Plate in Laboratory Air and Ringer’s Solution

Ilhamdi; Toshifumi Kakiuchi; Hiromi Miura; Tomohiko Fukihara; Yoshihiko Uematsu

Collaboration


Dive into the Hiromi Miura's collaboration.

Top Co-Authors

Avatar

Masakazu Kobayashi

Toyohashi University of Technology

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Tomoya Aoba

Toyohashi University of Technology

View shared research outputs
Top Co-Authors

Avatar

Toshifumi Kakiuchi

University of Electro-Communications

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Aya Kouno

Toyohashi University of Technology

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Tomohiko Matsuyama

Toyohashi University of Technology

View shared research outputs
Researchain Logo
Decentralizing Knowledge