Byung‐Nam Kim

Yonsei University

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Koji Morita

Kyushu University

K. Hiraga

National Institute for Materials Science

Hidehiro Yoshida

The University of Tokyo

Yoshio Sakka

National Institute for Materials Science

T. Suzuki

National Institute for Materials Science

Ji‐Guang Li

Hunan Academy of Agricultural Sciences

Teruo Kishi

Tokyo University of Science

Qi Zhu

Northeastern University

Hiroaki Furuse

National Institute for Materials Science

Xuejiao Wang

Wuhan University

Cooperative Institutions

National Institute for Materials Science

Life Cycle Engineering (United States)

The University of Tokyo

Seoul National University

Tohoku University

University of Tsukuba

Tokyo University of Science

National Institute of Advanced Industrial Science and Technology

American Ceramic Society

Korea Atomic Energy Research Institute

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Simulation of Grain Boundary Movement and Interaction with Spherical Particle by Finite Element Method

Journal of the Japan Institute of Metals and Materials (1998)

Byung‐Nam Kim Teruo Kishi

The axi-symmetric finite element method is developed in order to simulate 3-dimensional migration behavior of grain boundary around a spherical paticle. At first, the method is applied to the simulation of shrinkage behavior of a spherical grain boundary. The spherical grain boundary shrinks in keeping its original shape, and the velocity is consistent well with the theoretical prediction, indicating a validity of the present method. In the simulation of the interaction between curved grain boundary and spherical particle, the velocity of the grain boundary varies during the interaction process depending on the location from the particle. Since the velocity of the grain boundary near the particle is higher than that distant from the particle, the shape of the grain boundary is considerably deformed during the interaction. A minimum migrating velocity occurs at different time depending on the location of the boundary, and on the ratio between the diameter of the particle and the radius of curvature of the grain boundary. The decrease of the velocity and the time loss due to the particle-induced pinning increases with increasing particle radius.

Particle (ecology)

Radius of curvature

10.2320/jinstmet1952.62.2_125

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Simulation of cavitation processes in superplastic deformation

Metallurgical and Materials Transactions A (2002)

Byung‐Nam Kim K. Hiraga

Coalescence (physics)

Superplasticity

Volume fraction

10.1007/s11661-002-0332-x

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Citations (2)

AE Characterization of Microfracture Process in Ceramic Materials

Springer eBooks (1998)

Shuichi WAKAYAMA Byung‐Nam Kim

Toughening

Characterization

10.1007/978-1-4615-4847-8_98

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Simulation of densification behavior of nano-powder in final sintering stage: Effect of pore-size distribution

Journal of the European Ceramic Society (2020)

Byung‐Nam Kim Koji Morita T. Suzuki Ji‐Guang Li Hideaki Matsubara

Weibull modulus

10.1016/j.jeurceramsoc.2020.08.046

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Citations (8)

Simulation of microfracture process of brittle polycrystals: Microcracking and crack propagation

Computational Materials Science (1997)

Byung‐Nam Kim Shuichi WAKAYAMA

Brittleness

10.1016/s0927-0256(97)00045-1

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Citations (8)

Transparent ultrafine Yb³⁺:Y₂O₃ laser ceramics fabricated by spark plasma sintering

Journal of the American Ceramic Society (2017)

Hiroaki Furuse Shunsuke Nakasawa Hidehiro Yoshida Koji Morita T. Suzuki

Abstract Conventional ceramic processing techniques do not produce ultrafine‐grained materials. However, since the mechanical and optical properties are highly dependent on the grain size, advanced processing techniques are needed to obtain ceramics with a grain size smaller than the wavelength of visible light for new laser sources. As an empirical study for lasing from an ultrafine‐grained ceramics, transparent Yb 3+ :Y 2 O 3 ceramics with several doping concentrations were fabricated by spark plasma sintering ( SPS ) and their microstructures were analyzed, along with optical and spectroscopic properties. Laser oscillation was verified for 10 at.% Yb 3+ :Y 2 O 3 ceramics. The laser ceramics in our study were sintered without sintering additives, and the SPS produced an ultrafine microstructure with an average grain size of 261 nm, which is about one order of magnitude smaller than that of ceramics sintered by conventional techniques. A load was applied during heating to enhance densification, and an in‐line transmittance near the theoretical value was obtained. An analysis of the crystal structure confirmed that the Yb 3+ :Y 2 O 3 ceramics were in a solid solution. To the best of our knowledge, this study is the first report verifying the lasing properties of not only ultrafine‐grained but also Yb‐doped ceramics obtained by SPS .

Spark Plasma Sintering

Transparent ceramics

10.1111/jace.15232

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Citations (39)

Characterization of 2-dimensional crack propagation behavior by simulation and analysis

International Journal of Fracture (1996)

Byung‐Nam Kim Shuichi WAKAYAMA Masanori Kawahara

Transgranular fracture

10.1007/bf00037085

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Citations (44)

Simulation of AE Generation Behavior in Microfracture Process of 2-Dimensional Polycrystals.

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A (1996)

Byung‐Nam Kim Hidehumi NAITO Shuichi WAKAYAMA

AE (Acoustic Emission) generation behavior during microfracture process of 2-dimensional alumina polycrystals is simulated by assuming that a microfracture corresponds to an AE event. Various AE generation behaviors are predicted as a function of the grain boundary toughness (Kcb), the grain size and the distribution state of residual stresses due to crystalline anisotropy. The predicted AE events have a tendency to occur at higher stress with increasing Kcb and with decreasing grain size. By the fracture-mechanical calculation of the crack opening volume, the relative variation of AE amplitude is also simulated. The actual AE measurements are carried out in vacuum for the two kinds of alumina with-different grain size, and compared with the simulated results. The cumulative AE event curve for 11.5 μm grain size shows good agreement with the simulation when the Kcb is 0.35 times the grain toughness (Kcg), and that for 28.2 μm shows good agreement with the simulation at Kcb=0.45Kcg. The results of AE location for both the simulation and the measurement show the similar characteristics of the scattered distribution over the stressed fields.

Acoustic Emission

10.1299/kikaia.62.891

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Synthesis of highly-infrared transparent Y2O3–MgO nanocomposites by colloidal technique and SPS

Ceramics International (2020)

Lihong Liu Koji Morita T. Suzuki Byung‐Nam Kim

Spark Plasma Sintering

Suspension

Vickers hardness test

10.1016/j.ceramint.2020.02.153

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Citations (26)

Development of Laser Optical Elements by Spark Plasma Sintering Technique

The Review of Laser Engineering (2019)

Hiroaki Furuse Koji Morita Ryo Yasuhara Byung‐Nam Kim Hidehiro Yoshida

Spark plasma sintering (SPS), which can precisely control such sintering conditions as temperature, heating rate, the extent of uniaxial loading, and the holding time under a vacuum, has great potential for fabricating various types of functional materials. In particular, the high densification rates attained by this technique enable suppressed grain growth during sintering and hence fine-grained microstructures. For laser optics, we show that SPS is also effective for fabricating some laser optics including laser materials with fine-grained microstructure, and sapphire/Nd:YAG ceramic composite materials. Concerning these materials, this paper describes the microstructure, optical characteristics, and lasing properties and discusses the future possibility of SPS for fabricating high-average power laser optics.

Spark Plasma Sintering

Selective laser sintering

Transparent ceramics

10.2184/lsj.47.8_448

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