東北大学 · 工学
Kato教授の研究室では、金属的ガラス（非晶質合金）の成形性と力学的特性の向上を目的として、カーボン粒子やその他の強化相を添加した複合材料の開発を行っています。特に、銅型鋳造法を用いた大径（1〜3mm）の非晶質合金部材の形成に成功し、粒子の均一分散と界面の良好さを実現しています。また、ガラス転移付近での流動性や応力応答のメカニズムを解明するため、粘度と応力の温度・ひずみ率依存性の精密測定も実施しています。
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
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