Tohoku University · Engineering
Professor Hidemi Kato's research lab specializes in the development and characterization of bulk metallic glasses and their composites, focusing on enhancing mechanical properties through microstructural control. The lab investigates the thermomechanical behavior, viscosity, and flow stress of metallic glass-forming alloys near the glass transition temperature, aiming to understand deformation mechanisms and processability. A key research direction involves the incorporation of ceramic particles, such as ZrC, into amorphous matrices to improve strength and stability without compromising glass-forming ability. The lab also explores the fundamental relationships between processing conditions, microstructure, and mechanical performance in bulk amorphous materials.
Figures are computed from collected data and may differ slightly.
Bulk amorphous Zr55Al10Ni5Cu30 composites containing ZrC particles up to 17 vol% were formed in a cylindrical form with diameters of 1 to 3 mm by a copper mold casting process. The average particle size and interparticle spacing of the ZrC particles are 3 and 4 μm, respectively, and neither distinct agglomeration nor segregation of the ZrC particles is seen on the transverse and longitudinal cross-sections. The glass transition temperature (Tg), crystallization temperature (Tx) and melting tempe
The viscosity and flow stress of a bulk Pd40Ni10Cu30P20 alloy glass near the glass transition were measured as a function of temperature and strain rate under compression. The steady-state viscosity of the glass for a given temperature remains constant at low strain rate, then decreases by many orders of magnitude above a critical strain rate. A master curve in term of the viscosity ratio η/ηN and the product ηNε̇ has been constructed, where η and ηN are, respectively, the steady-state viscosity
Open papers in the app to read, cite, and organize with AI.
