Heterogeneous microstructure and mechanical behaviour of Al-8.3Fe-1.3V-1.8Si alloy produced by laser powder bed fusion

Yu, S.J., Wang, P., Li, H.C., Setchi, Rossitza ORCID: https://orcid.org/0000-0002-7207-6544, Wu, M.W., Liu, Z.Y., Chen, Z.W., Waqar, S. and Zhang, L.C. 2022. Heterogeneous microstructure and mechanical behaviour of Al-8.3Fe-1.3V-1.8Si alloy produced by laser powder bed fusion. Virtual and Physical Prototyping 18 (1) , e2155197. 10.1080/17452759.2022.2155197

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Abstract

The relationship between processing parameters, microstructure, and mechanical properties of Al-8.3Fe-1.3V-1.8Si alloy processed by laser powder bed fusion is seldom studied. Therefore, fully dense alloys with two parameters were selected to investigate this key issue. The results show that the alloy with low power and scanning speed (S200) shows fan-shell-shaped melt pools and laser tracks while another (S350) shows a deeper and wider melt pool. Both alloys obtain a heterogeneous microstructure without a secondary phase in melt pool (MP) and a nano-sized phase in melt pool boundary (MPB). The difference between solid-solution strengthening and Orowan strengthening in MP and MPB contributes to the difference in compressive yield strength (S200: 380 ± 14 MPa and S350: 705 ± 16 MPa), and heterogeneous nano-hardness results in different crack behaviours and failure strains. This work indicates that adjusting processing parameters is an effective method to control microstructure and mechanical properties of this alloy.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Publisher:	Taylor and Francis Group
ISSN:	1745-2759
Date of First Compliant Deposit:	18 January 2023
Date of Acceptance:	30 November 2022
Last Modified:	06 Jul 2023 20:10
URI:	https://orca.cardiff.ac.uk/id/eprint/155922

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