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Akiyama-Koyama Lab
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A materials lab that uncovers the mechanisms by which hydrogen entering metals makes them prone to fracture.
AboutAbout the lab
In pursuit of metallic materials that resist hydrogen.
The Akiyama-Koyama Lab studies hydrogen embrittlement in structural materials used in buildings, automobiles, nuclear power, and more.
When hydrogen enters a metal under stress, a type of fracture known as hydrogen embrittlement occurs.
The lab investigates how hydrogen enters metals through corrosion and how it behaves inside them, in order to clarify the mechanisms of fracture.
Based on these findings, the lab works on methods for evaluating hydrogen embrittlement and on developing materials that resist environments such as corrosive ones.
Key terms
- Hydrogen embrittlement
- A phenomenon in which hydrogen that has entered a metal makes the material lose toughness and become prone to fracture
- Corrosion
- A phenomenon in which a metal reacts with surrounding water or air and deteriorates, for example by rusting
- Phase transformation
- A change in the arrangement of atoms inside a metal into a different form, caused by changes in temperature or stress
NewsLab news
A master's student received the Young Presentation Encouragement Award from the Japan Society of Corrosion Engineering
Professor Akiyama, Associate Professor Koyama, and colleagues received the Materia Award from the Japan Institute of Metals and Materials
A master's student received the Student Poster Session Encouragement Award from the Iron and Steel Institute of Japan
A master's student received the Excellence Award from the Tohoku Branch of the Japan Society of Corrosion Engineering
A faculty member received the Best Poster Award at the Symposium for Core Clusters for Materials Science and Spintronics
ResearchResearch themes
The lab investigates hydrogen embrittlement caused by hydrogen that has entered structural materials, including its mechanisms and the process by which hydrogen enters materials. It also works on new microstructure control that exploits the relationship between hydrogen and phase transformation, and on the design of corrosion-resistant alloys.
*Illustrative imageMechanisms and Evaluation Methods of Hydrogen Embrittlement
The lab clarifies how hydrogen makes metallic structural materials more prone to fracture and develops methods to evaluate this property. It uses mechanical testing of hydrogen-charged specimens, analysis of hydrogen released from metals, and techniques that visualize hydrogen.
*Illustrative imageElectrochemical Study of Hydrogen Entry
The lab uses electrochemical methods to study how hydrogen enters metals in corrosive environments. It also studies ways to prevent hydrogen from entering.
*Illustrative imageNovel Materials Processing Using Hydrogen
The lab is pioneering new methods for producing the internal microstructure of metals exactly as desired, by exploiting the effect of hydrogen on phase transformation in metals.
*Illustrative imageDesign of Corrosion-Resistant Alloys
The lab investigates how metallic materials corrode and develops design concepts for new corrosion-resistant alloys.
MembersFaculty
- ProfessorEiji Akiyama
- Associate ProfessorMotomichi Koyama
- Associate ProfessorHiroshi Kakinuma
- Assistant ProfessorKo Ebina
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Steel-with-Hydrogen-Induced-Cracks-01” CEphoto, Uwe Aranas / CC BY-SA 4.0 (cropped)
- Mechanisms and Evaluation Methods of Hydrogen Embrittlement: “The brittle fracture surface of low-carbon steel” DanilovVA / CC BY-SA 4.0 (cropped)
- Electrochemical Study of Hydrogen Entry: “Pitting Corrosion on a pipe” Vsolymossy / CC BY 3.0 (cropped)
- Novel Materials Processing Using Hydrogen: “Martensit” uliss / Public domain (cropped)
- Design of Corrosion-Resistant Alloys: “Girder bridge, New Jersey Turnpike Widening” Z22 / CC BY-SA 4.0 (cropped)
- Related lab (Sato (Y.) Lab): “Carbon Nanotube Measurements ( )” National Institute of Standards and Technology / Public domain (cropped)
- Related lab (Yamaguchi-Ishizako Lab): “Gait laboratory” D. Gordon E. Robertson / CC BY-SA 3.0 (cropped)
- Related lab (Nishi Lab): “Non-wetting behavior of a surface of pelletized highly hydrophobic sand. Contact angle between water droplet and the surface is 145.22 degrees” Murat Baisariyev and Aidar Seralin / CC BY-SA 4.0 (cropped)
- Related lab (Watanabe-Abe Lab): “Chapelcross Nuclear Power Station - geograph.org.uk - 1274138” M J Richardson / CC BY-SA 2.0 (cropped)
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