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Transient nucleation in selective laser melting of Zr-based bulk metallic glass

Ericsson, A. LU ; Pacheco, V. ; Sahlberg, M. ; Lindwall, J. ; Hallberg, H. LU orcid and Fisk, M. LU (2020) In Materials and Design 195.
Abstract

The crystallization rate during selective laser melting (SLM) of bulk metallic glasses (BMG) is a critical factor in maintaining the material's amorphous structure. To increase the understanding of the interplay between the SLM process and the crystallization behavior of BMGs, a numerical model based on the classical nucleation theory has been developed that accounts for the rapid temperature changes associated with SLM. The model is applied to SLM of a Zr-based BMG and it is shown that the transient effects, accounted for by the model, reduce the nucleation rate by up to 15 orders of magnitude below the steady-state nucleation rate on cooling, resulting in less nuclei during the build process. The capability of the proposed modelling... (More)

The crystallization rate during selective laser melting (SLM) of bulk metallic glasses (BMG) is a critical factor in maintaining the material's amorphous structure. To increase the understanding of the interplay between the SLM process and the crystallization behavior of BMGs, a numerical model based on the classical nucleation theory has been developed that accounts for the rapid temperature changes associated with SLM. The model is applied to SLM of a Zr-based BMG and it is shown that the transient effects, accounted for by the model, reduce the nucleation rate by up to 15 orders of magnitude below the steady-state nucleation rate on cooling, resulting in less nuclei during the build process. The capability of the proposed modelling approach is demonstrated by comparing the resulting crystalline volume fraction to experimental findings. The agreement between model predictions and the experimental results clearly suggests that transient nucleation effects must be accounted for when considering the crystallization rate during SLM processing of BMGs.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Additive manufacturing, Classical nucleation theory, Crystallization, Metallic glass, Selective laser melting, Transient nucleation
in
Materials and Design
volume
195
article number
108958
publisher
Elsevier
external identifiers
  • scopus:85088122286
ISSN
0264-1275
DOI
10.1016/j.matdes.2020.108958
language
English
LU publication?
yes
id
61ab09f0-49e0-42cd-88ed-7a132192d65b
date added to LUP
2020-07-27 13:02:02
date last changed
2022-04-18 23:41:38
@article{61ab09f0-49e0-42cd-88ed-7a132192d65b,
  abstract     = {{<p>The crystallization rate during selective laser melting (SLM) of bulk metallic glasses (BMG) is a critical factor in maintaining the material's amorphous structure. To increase the understanding of the interplay between the SLM process and the crystallization behavior of BMGs, a numerical model based on the classical nucleation theory has been developed that accounts for the rapid temperature changes associated with SLM. The model is applied to SLM of a Zr-based BMG and it is shown that the transient effects, accounted for by the model, reduce the nucleation rate by up to 15 orders of magnitude below the steady-state nucleation rate on cooling, resulting in less nuclei during the build process. The capability of the proposed modelling approach is demonstrated by comparing the resulting crystalline volume fraction to experimental findings. The agreement between model predictions and the experimental results clearly suggests that transient nucleation effects must be accounted for when considering the crystallization rate during SLM processing of BMGs.</p>}},
  author       = {{Ericsson, A. and Pacheco, V. and Sahlberg, M. and Lindwall, J. and Hallberg, H. and Fisk, M.}},
  issn         = {{0264-1275}},
  keywords     = {{Additive manufacturing; Classical nucleation theory; Crystallization; Metallic glass; Selective laser melting; Transient nucleation}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Materials and Design}},
  title        = {{Transient nucleation in selective laser melting of Zr-based bulk metallic glass}},
  url          = {{http://dx.doi.org/10.1016/j.matdes.2020.108958}},
  doi          = {{10.1016/j.matdes.2020.108958}},
  volume       = {{195}},
  year         = {{2020}},
}