Ken-ichi Ebihara

TL;DR: The microscopic mechanism of grain boundary (GB) embrittlement in metals by hydrogen segregation (trapping) has been not well understood for many years as discussed by the authors, and it was shown that the calculated cohesive energy of bcc Fe Σ3(111) and fcc Al(Cu) Σ5(012) symmetrical tilt GBs can be significantly reduced if many hydrogen atoms segregate at the GBs.

TL;DR: In this article, the effects of hydrogen on the GB decohesion were analyzed by calculating the dependence of hydrogen segregation energy on the coverage relevant to the repulsive interaction among segregated hydrogen atoms at the GB and on its fracture surfaces, together with generalizing McLean's formula.

TL;DR: In this paper, the microstructures of precipitates in Al-Zn-Mg alloys in peak-aged condition have been studied using scanning transmission electron microscope, where the same thermo-mechanical treatment was applied in all alloys.

TL;DR: In this article, the authors present a benchmark study on different numerical models for analyzing hydrogen thermal desorption spectra, by focusing on the adoption of the local equilibrium hypothesis in these models.

TL;DR: It is shown that the aluminium–precipitate interface is a more preferable trap site than void, dislocation and grain boundary and controlling the hydrogen distribution plays a key role to design further high-strength and high-toughness aluminium alloys.