Hirofumi Miyahara | Last modified date:2024.01.04 |
Professor /
Metals Science for Structural Materials
Department of Materials Science and Engineering
Faculty of Engineering
Department of Materials Science and Engineering
Faculty of Engineering
Graduate School
Undergraduate School
Other Organization
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Homepage
https://kyushu-u.elsevierpure.com/en/persons/hirofumi-miyahara
Reseacher Profiling Tool Kyushu University Pure
Academic Degree
Dr. of Engineering (Kyushu University, Japan)
Field of Specialization
Solidification and Crystal Growth
Outline Activities
The solidification and crystal growth (melt growth) for metals, semiconductors and ceramics are developed and lectured in this laboratory.
---Research--
○Analysis of rapid solidification microstructure
1. Creation of structural or functional materials by 3D printer
2. Control of rapid melt – solidified microstructure using a selective laser melting
○Analysis of crystal growth mechanism for facetted grew crystal
1.Analysis of crystal orientation control of multi-crystal solar cell
2.Analyses of formation of graphite and carbides
○Microstructure control and evaluation of characteristics for iron based alloy for casting
1.Microstructure control of high alloyed cast iron by a CALPHAD method
○Microstructure control and evaluation of characteristics for alloy particle for thermal spray processing
1.Influence of cooling rate on microstructure of iron, nickel, cobalt and aluminum alloy
○Microstructure control and evaluation of characteristics of non-ferrous iron for casting
1.Influence of alloy element on microstructures of magnesium and aluminum alloys
○Microstructure control and evaluation of characteristics of composite materials
1.Analysis of crystal morphology and phase selection among fibers
--Education--
○For graduate student
1.Control of crystal growth
2.Composite materials
○For Undergraduate student
1.Solidification and crystalline growth
2.Joining and composite engineering
---Research--
○Analysis of rapid solidification microstructure
1. Creation of structural or functional materials by 3D printer
2. Control of rapid melt – solidified microstructure using a selective laser melting
○Analysis of crystal growth mechanism for facetted grew crystal
1.Analysis of crystal orientation control of multi-crystal solar cell
2.Analyses of formation of graphite and carbides
○Microstructure control and evaluation of characteristics for iron based alloy for casting
1.Microstructure control of high alloyed cast iron by a CALPHAD method
○Microstructure control and evaluation of characteristics for alloy particle for thermal spray processing
1.Influence of cooling rate on microstructure of iron, nickel, cobalt and aluminum alloy
○Microstructure control and evaluation of characteristics of non-ferrous iron for casting
1.Influence of alloy element on microstructures of magnesium and aluminum alloys
○Microstructure control and evaluation of characteristics of composite materials
1.Analysis of crystal morphology and phase selection among fibers
--Education--
○For graduate student
1.Control of crystal growth
2.Composite materials
○For Undergraduate student
1.Solidification and crystalline growth
2.Joining and composite engineering
Research
Research Interests
Awards
- Creation of structural or functional materials by 3D printer
keyword : metal powder, laser, rapid solidification, amorphous
2016.04. - Control of rapid melt – solidified microstructure using a selective laser melting
keyword : rapid solidification, dendrite arm , amorphous
2016.04. - Microstructure Control of Particle Alloy for Thermal Spray
keyword : solidification, Thermal spray, wear resitance, microsegragation
2008.04. - Microstruture of Nickel base super alloys
keyword : simulation, macro segregation
2004.04. - Microstructure development through the solidification processing and its application for structural materials
keyword : liquid state fablication, computer simulation, macro scopic segregation, hardness, solidification
2006.04. - Analysis of fluid flow mechanism and critical condition of formation of cast defects of ferro- and non-ferro- alloys
keyword : fluid flow
2009.02. - Development of High Wear Resistant Cast Iron for Rolls
keyword : solidification, hardness, friction resitance, cast iron, carbon, carbide
2006.04. - Analysis of Mechanism of Crystal Growth fro Multicrystal Silicon Ingot for Solar Battery
keyword : multicrystal, silicon, solar battery, unidirectional solidification, colomnar structure
2002.04Microstructure of polycrystalline silicon is investigated through the unidirectional solidification technique, and the mechanism of the twin growth on a reentrant corner is evaluated. The model of two dimensional nucleation on the reentrant corner is established and their critical nucleation radiuses are calculated from 70 to 80 % of radius of general two-dimensional nucleation. Reducing the undercooling dew to the twin growth can explain the reasons of increasing the gain size.. - Microstructural Control of Ceramic Reinforced Metals by the Solidification Processing
keyword : composites, dislocation, ceramics, diffusivity,
1994.04Directional solidification studies is carried out in continuous alumina fiber reinforced Al-Cu alloy composites in order to clarify the influences of fibers on crystal growth of matrix alloy in the composites. A model based on the continuity of liquid phase among fibers reveals how fibers influence both the concentration of copper on the dendrite tips and the size of the lateral solute diffusion field.. - computer simulation for crystal growth of metal matrix composites
keyword : composites, thermal diffusion, cast, simulation, wear resistant, micro segregation
1997.04~2009.03Numerical simulation is applied to evaluate the thermal and solutal influences of fibers on the dendrite growth of matrix alloy reinforced with continuous fibers. The results of temperature and solute distribution, and dendrite tip undercooling and tip radius were compared with experimental data obtained from directional solidification studies for fiber reinforced succinonitrile-acetone alloy composites. Numerical analysis reveals that tip composition and undercooling increased as the fiber interstices became smaller than the primary dendrite arm spacing. The constraint of growth on the secondary arm and the change of dendrite morphology are also shown in the analysis..
- 「High speed crystallization for high densely packed onion type graphite」
- 「」
- Microstructure of polycrystalline silicon is investigated through the unidirectional solidification technique, and the mechanism of the twin growth on a reentrant corner is evaluated.
- Microstructure of polycrystalline silicon is investigated through the unidirectional solidification technique, and the mechanism of the twin growth on a reentrant corner is evaluated.
- Microstructure of polycrystalline silicon is investigated through the unidirectional solidification technique. Reducing the undercooling dew to the twin growth can explain the reasons of increasing the gain size.
- Microstructure of polycrystalline silicon is investigated through the unidirectional solidification technique, and the mechanism of the twin growth on a reentrant corner is evaluated. The model of two dimensional nucleation on the reentrant corner is established and their critical nucleation radiuses are calculated from 70 to 80 % of radius of general two-dimensional nucleation. Reducing the undercooling dew to the twin growth can explain the reasons of increasing the gain size.
Reports
Papers
Presentations
- The paper titled "Microstructure Control of Thermally Sprayed Co-Based Self-Fluxing Alloy Coatings by Diffusion Treatment" was selected to Best Paper Award 2007 in J. of Thermal Spray Technology
- 「Effective Collaboration of Elementary School and University Students for the Development of Creativity by Casting and Designing」
Educational
Educational Activities
(1) Control of crystal growth---Lecture concerning distribution of alloying element on crystal growth for alloys
(2) Composite materials---Lecture concerning design, processing and control of composite materials
(1) Solidification and crystalline growth---Lecture concerning microstructure formation process for alloy, semiconductor, and ceramics
(2) Joining and composite engineering---Lecture concerning process of welding and composite materials.
(3) Practice of material science ---Experiment and maneuver of crystal control and evaluation of solidified material by liquid state fabrication
(4) Material science outline--- Lecture concerning manufacturing process, microstructure control, and evaluation of characteristics of material. such as car, airplane, ships, and rockets.
(1) Control of crystal growth---Lecture concerning distribution of alloying element on crystal growth for alloys
(2) Composite materials---Lecture concerning design, processing and control of composite materials
(1) Solidification and crystalline growth---Lecture concerning microstructure formation process for alloy, semiconductor, and ceramics
(2) Joining and composite engineering---Lecture concerning process of welding and composite materials.
(3) Practice of material science ---Experiment and maneuver of crystal control and evaluation of solidified material by liquid state fabrication
(4) Material science outline--- Lecture concerning manufacturing process, microstructure control, and evaluation of characteristics of material. such as car, airplane, ships, and rockets.
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