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Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion

Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion
Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion
For the first time, high-pressure torsion (HPT) was applied to additively manufactured AlSi10Mg built in two directions (vertical and horizontal) by Selective Laser Melting (SLM) and the influence of extreme torsional strain on the porosity, microstructure, and microhardness of the alloy was investigated. ImageJ analysis indicates that significant porosity reduction is achieved by 1/4 HPT revolution (low strain). Optical microscopy (OM) and scanning electron microscopy (SEM) observations reveal the steady distortion and elongation of the melt pools, the continuous elongation of the cellular-dendritic Al matrix, and breakage of the eutectic Si phase network with increased HPT revolutions. Microhardness measurements indicate that despite the significant increase in hardness attained from HPT processing, hardness saturation and microstructural homogeneity are not achieved even after 10 HPT revolutions. X-ray diffraction (XRD) line broadening analysis demonstrates increased dislocation densities with increased HPT revolutions, which contributes to the considerably higher hardness values compared to as-received samples.
Porosity, Microstructure, Microhardness, AlSi10Mg, additive manufacturing, high-pressure torsion
0268-3768
4321–4337
Mohd Yusuf, Shahir Yasin Bin
5888c057-33da-45f3-a84d-95a291db8f34
Hoegden, Mathias
fe5e3617-ba14-4763-b151-8b2b0a477218
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Mohd Yusuf, Shahir Yasin Bin
5888c057-33da-45f3-a84d-95a291db8f34
Hoegden, Mathias
fe5e3617-ba14-4763-b151-8b2b0a477218
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21

Mohd Yusuf, Shahir Yasin Bin, Hoegden, Mathias and Gao, Nong (2020) Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion. International Journal of Advanced Manufacturing Technology, 106, 4321–4337. (doi:10.1007/s00170-019-04817-5).

Record type: Article

Abstract

For the first time, high-pressure torsion (HPT) was applied to additively manufactured AlSi10Mg built in two directions (vertical and horizontal) by Selective Laser Melting (SLM) and the influence of extreme torsional strain on the porosity, microstructure, and microhardness of the alloy was investigated. ImageJ analysis indicates that significant porosity reduction is achieved by 1/4 HPT revolution (low strain). Optical microscopy (OM) and scanning electron microscopy (SEM) observations reveal the steady distortion and elongation of the melt pools, the continuous elongation of the cellular-dendritic Al matrix, and breakage of the eutectic Si phase network with increased HPT revolutions. Microhardness measurements indicate that despite the significant increase in hardness attained from HPT processing, hardness saturation and microstructural homogeneity are not achieved even after 10 HPT revolutions. X-ray diffraction (XRD) line broadening analysis demonstrates increased dislocation densities with increased HPT revolutions, which contributes to the considerably higher hardness values compared to as-received samples.

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Yusuf 2020 Article Effect Of Sample Orientation - Version of Record
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More information

Accepted/In Press date: 19 December 2019
e-pub ahead of print date: 15 January 2020
Published date: February 2020
Keywords: Porosity, Microstructure, Microhardness, AlSi10Mg, additive manufacturing, high-pressure torsion

Identifiers

Local EPrints ID: 436784
URI: http://eprints.soton.ac.uk/id/eprint/436784
ISSN: 0268-3768
PURE UUID: ad6677d2-77ba-47d8-b60f-d60f4873dec8

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Date deposited: 08 Jan 2020 17:33
Last modified: 04 Mar 2020 17:33

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