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NOMATEN JUNIOR SEMINAR: Studying dislocation density evolution in polycrystalline Mg alloy with machine learning

Date
Date 2
Place
https://www.gotomeet.me/NCBJmeetings/junior-nomaten-seminar

NOMATEN JUNIOR SEMINAR

Tuesday, FEBRUARY 15th 2022 13:00 (1.00PM CET)

JOIN VIA www.gotomeet.me/NCBJmeetings/junior-nomaten-seminar

"Studying dislocation density evolution in polycrystalline Mg alloy with machine learning"

Henri Salmenjoki, Doctoral Candidate, Dept. Applied Physics at Aalto University (Finland)




ABSTRACT:

Plastic deformation of crystalline materials is a complex phenomenon driven primarily by the motion of dislocations which are line-like defects in the crystal structure. In polycrystalline materials, the complexity increases due to grain boundaries which affect the dislocations by pinning them and blocking their movement. Understanding the dislocation processes and interplay with the grain boundaries is essential in improving and designing specific material properties.

Here we discuss recent attempts on using machine learning to forecast certain aspects of the deformation process. The used data is from tensile tests of polycrystalline Mg alloy and obtained by electron backscatter diffraction. In the first part of the talk, we present results on comparing the grains before and after loading by clustering the grains using the observed dislocation structures. And in the second part, we apply regression methods to try to predict the grain-wise evolution of the dislocation density.

BIO:

Henri Salmenjoki is a doctoral candidate in the Complex Systems and Materials group at Aalto University, Department of Applied Physics.
Working under the supervision of Prof. Mikko Alava, main focus of his research has been to apply machine learning methods in the study of crystal plasticity and discrete dislocation dynamics simulations.

Galeria
JUNIOR NOMATEN Seminar


This project has received funding from the European Union Horizon 2020 research and innovation
programme under grant agreement No 857470 and from European Regional Development Fund
via Foundation for Polish Science International Research Agenda PLUS programme grant
No MAB PLUS/2018/8.
Poland
The project is co-financed from the state budget within the framework of the undertaking of the Minister of Science and Higher Education "Support for the activities of Centers of Excellence established under Horizon 2020".

Grant: 5 143 237,70 EUR
Total value: 29 971 365,00 EUR
Date of signing the funding agreement: December 2023

The purpose of the undertaking is to support entities of the higher education and science system that have received funding from the European Union budget in the competition H2020-WIDESPREAD-2018-2020/WIDESPREAD-01-2018-2019: Teaming Phase 2. in the preparation, implementation and updating of activities, maintenance of material resources necessary for carrying out activities, acquisition and modernization of scientific and research apparatus, maintenance and development of personnel potential necessary for the implementation of activities, and dissemination of the results of scientific activities.