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The role of internal defects on anisotropic tensile failure of L-PBF AlSi10Mg alloys

This paper investigates the effects of defects on tensile failure of additive manufactured AlSi10Mg alloy focusing particularly on the role of large pancake shaped loss of fusion (LOF) defects lying perpendicular to the build direction (BD). Time-lapse in situ synchrotron radiation X-ray micro-compu...

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Autores principales: Wu, Zhengkai, Wu, Shengchuan, Gao, Xi, Lin, Ying, Xue, Yanling, Withers, Philip J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10482850/
https://www.ncbi.nlm.nih.gov/pubmed/37673912
http://dx.doi.org/10.1038/s41598-023-39948-z
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author Wu, Zhengkai
Wu, Shengchuan
Gao, Xi
Lin, Ying
Xue, Yanling
Withers, Philip J.
author_facet Wu, Zhengkai
Wu, Shengchuan
Gao, Xi
Lin, Ying
Xue, Yanling
Withers, Philip J.
author_sort Wu, Zhengkai
collection PubMed
description This paper investigates the effects of defects on tensile failure of additive manufactured AlSi10Mg alloy focusing particularly on the role of large pancake shaped loss of fusion (LOF) defects lying perpendicular to the build direction (BD). Time-lapse in situ synchrotron radiation X-ray micro-computed tomography during straining reveals how, when tested parallel to the BD, the LOF defects extend laterally with straining connecting to other defects and giving rise to low plasticity and an essentially brittle failure mode. When they are aligned edge-on to the straining direction, failure is characterised by a ductile cup-cone failure with significant elongation of the defects axially and extensive necking prior to failure. The soft fish-scale melt pool boundaries were also found to affect the fracture path. These results highlight the anisotropic effect of loss of fusion defects in controlling tensile ductility and the need to minimize their size and aspect ratio. In cases where these cannot be fully eliminated the component should be fabricated such that the BD is not aligned with the dominant in-service loading direction.
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spelling pubmed-104828502023-09-08 The role of internal defects on anisotropic tensile failure of L-PBF AlSi10Mg alloys Wu, Zhengkai Wu, Shengchuan Gao, Xi Lin, Ying Xue, Yanling Withers, Philip J. Sci Rep Article This paper investigates the effects of defects on tensile failure of additive manufactured AlSi10Mg alloy focusing particularly on the role of large pancake shaped loss of fusion (LOF) defects lying perpendicular to the build direction (BD). Time-lapse in situ synchrotron radiation X-ray micro-computed tomography during straining reveals how, when tested parallel to the BD, the LOF defects extend laterally with straining connecting to other defects and giving rise to low plasticity and an essentially brittle failure mode. When they are aligned edge-on to the straining direction, failure is characterised by a ductile cup-cone failure with significant elongation of the defects axially and extensive necking prior to failure. The soft fish-scale melt pool boundaries were also found to affect the fracture path. These results highlight the anisotropic effect of loss of fusion defects in controlling tensile ductility and the need to minimize their size and aspect ratio. In cases where these cannot be fully eliminated the component should be fabricated such that the BD is not aligned with the dominant in-service loading direction. Nature Publishing Group UK 2023-09-06 /pmc/articles/PMC10482850/ /pubmed/37673912 http://dx.doi.org/10.1038/s41598-023-39948-z Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Wu, Zhengkai
Wu, Shengchuan
Gao, Xi
Lin, Ying
Xue, Yanling
Withers, Philip J.
The role of internal defects on anisotropic tensile failure of L-PBF AlSi10Mg alloys
title The role of internal defects on anisotropic tensile failure of L-PBF AlSi10Mg alloys
title_full The role of internal defects on anisotropic tensile failure of L-PBF AlSi10Mg alloys
title_fullStr The role of internal defects on anisotropic tensile failure of L-PBF AlSi10Mg alloys
title_full_unstemmed The role of internal defects on anisotropic tensile failure of L-PBF AlSi10Mg alloys
title_short The role of internal defects on anisotropic tensile failure of L-PBF AlSi10Mg alloys
title_sort role of internal defects on anisotropic tensile failure of l-pbf alsi10mg alloys
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10482850/
https://www.ncbi.nlm.nih.gov/pubmed/37673912
http://dx.doi.org/10.1038/s41598-023-39948-z
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