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Dissertation in Solid Mechanics - Johan Lindwall

Published: 28 June 2021

On May 26th, 2021 Johan Lindwall made his Thesis Defense in the subject Material Mechanics at Luleå University of Technology.

The thesis is entitled “Modelling of laser-based powder bed fusion for bulk metallic glass formation”.

Faculty opponent was Professor Albert To, University of Pittsburgh, US.

Johan has developed a modelling approach to predict the glass formation during additive manufacturing with laser-based powder bed fusion (PBF-LB). Metallic glasses are non-crystalline metallic materials that possess some exceptional properties because of its amorphous structure. Manufacturing of metallic glass is possible by rapid cooling of a liquid metal alloy. PBF-LB is a promising method by which bulk metallic glass potentially can be produced.

Numerical simulation can assist the development of the process for bulk metallic glass formation by predicting the phase evolution. Simulations can also help to increase the understanding of where, when and why the unwanted crystalline structures develop. The result of Johan’s research is a coupled thermal and phase transformation model that can predict the trend in crystalline phase evolution in a bulk metallic glass with respect to the process parameters. The predictions show very good agreement with experiments. The model is a powerful tool that help the development and fine tuning of process parameters to produce bulk metallic glass.