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Tomoya Aoba

Affiliation Department of Mechanical Engineering
Title Assistant Professor
Fields of Research Material science
Degree Dr. Eng. (Nagaoka University of Technology)
Academic Societies The Japan Institute of Metals / The Japan Institute of Light Metals / The Japan Society of Applied Physics
E-mail aoba@me
Please append ".tut.ac.jp" to the end of the address above.
Laboratory website URL http://str.me.tut.ac.jp
Researcher information URL Researcher information

Research

We perform microstructural control of aluminum alloys by severe plastic deformation and heat treatment in order to high-functionalization (of mechanical property)

Theme1:Development of high-strength Al alloy by severe plastic deformation

Overview
Microstructre of aluminum alloy processed by severe plastic deformation

Multi-directional forging (MDFing) is one of the severe plastic deformation (SPD) processes which are high efficiency method for obtaining ultra-fine grained metallic materials. We create high-strength materials beyond conventional ones by MDFing and subsequent heat treatmentp.

Selected publications and works

♦T. Aoba, M. Kobayashi, H. Miura, Effects of aging on mechanical properties and microstructure of multi-directionally forged 7075 aluminum alloy, Mater. Sci. and Eng. A, 700 (2017) 220-225.
♦T. Aoba, M. Kobayashi, H. Miura, Microstructure evolution and enhancement of mechanical properties by multi-directional forging and aging of 6000 series aluminum alloy, J. light metals, 67 (2017) 277-283.

Keywords

Severe plastic deformation / micro structural control / dynamic recrystallization

Theme2:Synthesize of novel high-Tc superconductor

Overview
Crystal structure of homologous series of zero charge reservoir superconductor

Since the superconducting applications superconducting transition temperature and critical current density limit the practical range, it is hoped to develop a material with superior properties. High-Tc superconductors to be called "Zero charge reservoir superconductor" capture the organic molecule such as water molecules and carbon dioxide in the atmosphere into the crystal structure and then the superconducting transition temperature and critical current density will change. We investigate the effect of the organic molecule intercalation on the superconducting properties from the point of view of the microstructure and crystal structure. This study aims to develop materials with high superconducting properties and clarify the intercalation mechanism.

Selected publications and works

♦T. Aoba , T. Suzuki, T. Nakayama, H. Suematsu, K. Niihara, and M. Karppinen, Enhanced magnetic irreversibility characteristics by expansion of blocking block for Sr2Ca2Cu3O8-δ high-Tc superconductor, JJAP., 56 (2017) 083101.
♦T. Aoba , T. Suzuki, T. Nakayama, H. Suematsu, K. Niihara, and M. Karppinen, Superconducting water derivatives of Sr2Can−1CunO2+2n-δ (n = 2–4) high-Tc superconductors, Mater. Chem. Phys., 177 (2016) 67-72.
♦T. Aoba, T. Kato, T. Suzuki, T. Nakayama, H. Suematsu and K. Niihara, Generation of Sr2Ca(n-1)CunOy phases (n=5-7) by high pressure synthesis, J. Appl. Phys., 114 (2013) 193903-1 - 193903-6.

Keywords

Intercalation, high-pressure synthesis, superconductivity

Title of class

Descriptive Geometry Exercise / Creative Experiment for Mechanical Engineering


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