Tohoku University · Engineering
Professor Hao Yu's research lab specializes in the mechanics of materials and advanced structural materials for extreme environments, with a strong focus on elastic field solutions for inclusions and defects in anisotropic and bimaterial solids. The lab develops analytical and computational methods to understand the behavior of materials with microstructural features such as inclusions, dislocations, and oxide dispersions, particularly in transversely isotropic and functionally graded systems. A key research direction involves designing and optimizing oxide dispersion strengthened (ODS) ferritic and copper alloys for high-temperature and radiation-resistant applications in next-generation nuclear reactors and fusion energy systems.
Figures are computed from collected data and may differ slightly.
Abstract A general method is presented to obtain the elastic field in two joined semi-infinite isotropic solids due to an inclusion of any shape which undergoes a spontaneous change of shape and is located anywhere within one of the semi-infinite solids. The inclusions change of shape is such that, were the surrounding material absent, it would result from some prescribed stress free transformation strain (eigenstrain). The two semi-infinite solids can be either perfectly bonded or in frictionle
Abstract A method that introduces a new stress vector function (the hexagonal stress vector) is applied to obtain, in closed form, the elastic fields due to an inclusion in transversely isotropic solids. The solution is an extension of Eshelby’s solution for an ellipsoidal inclusion in isotropic solids. The Green’s functions for double forces and double forces with moment are derived and these are then used to solve the inclusion problem. The elastic field inside the inclusion is expressed in te
In order to develop a robust alumina scale dispersed with nano-oxide particles for FeCrAl oxide dispersion strengthened (ODS) ferritic alloys, the oxidation behavior of FeCrAl ODS ferritic alloys with zirconium and excessive oxygen (Ex. O) additions was investigated at 900 °C in air. Zirconia incorporation into alumina scale was not observed in the Ex. O-added FeCrAl ODS alloys at 900 °C, instead of this, a distribution with dense Y-Zr oxide particles inside the alumina scale was found, which is
Abstract A method for obtaining the analytic solution of the elastic fields due to defects such as inclusions, dislocations, disclinations, and point defects in transversely isotropic bimaterials is presented. The bimaterial consists of two semi-infinite transversely isotropic solids either perfectly bonded together or in frictionless contact with each other at a planar interface which is parallel to the plane of isotropy of both solids. The elastic solution is expressed in terms of the hexagona
Alumina-forming FeCrAl oxide dispersion strengthened (ODS) ferritic alloys are considered as promising structure materials for the next-generation nuclear reactors. Current work is aimed at investigating Fe ion irradiation effect on the alumina scale formed on FeCrAl ODS ferritic alloy. A single alpha-alumina layer with a thickness of about 0.7 µm was formed on the surface of the alloy by a pre-oxidation process at 1000 °C with 9 h. The pre-oxidized specimen was subsequently irradiated using 6.4
Oxide dispersion strengthened Cu (ODS Cu) alloys possess a high potential to be used as promising heat sink materials for the divertor system in DEMO fusion reactors. Considering their future application in fusion reactor divertor systems, mass-production of ODS Cu alloys is a must. The purpose of this study is to investigate the feasibility of large-scale production of ODS Cu alloys by improving the production process based on the already established mass-production process of ODS Fe alloys in
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