(Report報告)The 117th IROAST Seminar was held 第117回IROASTセミナーが開催されました

Feb 20, 2024

The 117th IROAST Seminar organized by Prof. Sadahiro TSUREKAWA (FAST, Kumamoto University) was held on February 20, 2024. Prof. Pavel LEJČEK (IROAST Visiting Professor) is a very well-known researcher in material science and one of leading researchers in world. He visits Kumamoto University every year to give a seminar, and this time, he gave a lecture on the fundamental of grain boundary segregation. It was a great opportunity for the students to attend a special lecture that went beyond the limited content of the regular classes.

2024年2月20日、連川 貞弘教授(熊本大学 大学院先端科学研究部)の世話人により、第117回IROASTセミナーが開催されました。

■ Organizer|世話人   

熊本大学 先端科学研究部   連川 貞弘 教授
Prof. Sadahiro TSUREKAWA (FAST, Kumamoto University)

■ Speaker|講演者

Pavel LEJčEK 教授 (チェコ科学アカデミー物理学研究所・チェコ共和国)
Prof. Pavel  LEJčEK
Institute of Physics, Academy of Sciences of the Czech Republic (Czech Republic)

■At Venue|会場の様子


■Group Photo|集合写真


The 117th IROAST Seminar 第117回IROASTセミナー開催のお知らせ

Feb 7, 2024

国際先端科学技術研究機構(IROAST)は、チェコ科学アカデミー物理学研究所所属、Pavel Lejček IROAST客員教授による、第117回 IROASTセミナーを下記のとおり開催いたします。

  1.  日 時:令和6年 2月 20日(火) 13:00~
  2. 会 場:黒髪南C3 (工学部研究棟Ⅰ) 59番 308室
  3. 講演者・演題 (Title):
    Pavel Lejček 教授 (チェコ科学アカデミー物理学研究所・チェコ共和国)
    “Introduction to grain boundary segregation”
  4. 概要(Abstract):
    Grain boundary segregation is one of the important materials properties which may substantially affect their behavior. On one hand, it can cause extended and quick degradation of the material due to the brittle intergranular fracture. On the other hand, it can contribute to stabilization of the nanocrystalline structure of materials due to substantial reduction of the mobility of the grain boundaries.
    In this lecture, we briefly describe experimental as well as theoretical methods of the study of solute segregation at grain boundaries, derive the basic expressions of interfacial segregation - Gibbs approach and Langmuir–McLean based segregation isotherm - and discuss the important parameters of the grain boundary segregation including the grain size and anisotropy. Finally, we introduce a phenomenological method to prediction the thermodynamic parameters of grain boundary segregation – enthalpy, entropy and binary interaction parameter - and compare the experimental results with calculated data and predicted values of these parameters for example of the grain boundary segregation in bcc iron.
  5. 世話人: 連川 貞弘 教授 (大学院先端科学研究部)




IROAST will have the 117th IROAST Seminar by IROAST Visiting Professor Pavel Lejček, Institute of Physics, Academy of Sciences of the Czech Republic, Czech Republic as follows.
Anyone interested in this seminar is more than welcome. Registration is not required.
We hope to see you at the seminar.                             

  1. Date and time: Tue, February 20, 2024  13:00 –
  2. Venue: Room 308, Kurokami South C3 (Faculty of Engineering Research Bldg. I)
  3. Speaker: Professor Pavel Lejček, Institute of Physics, Academy of Sciences of the Czech Republic, Czech Republic
  4. Title & Abstract: Referred to above
  5. Organizer: Prof. Sadahiro Tsurekawa (FAST, Kumamoto University)

*This seminar will be held in English.


IROAST Seminar inquiries:
Sato (Ms.)

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