Strengthening strategies for an Al alloy processed by in-situ alloying during laser powder bed fusion

In this work, a high strength Al alloy was successfully processed via in-situ alloying of AlSi10Mg and Cu elemental powders during Laser Powder Bed Fusion. To get superior strength, 4 wt% of Cu was added to AlSi10Mg composition to benefit from the additional solid solution and precipitation strength...

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Autores principales:	Federico Bosio, Paolo Fino, Diego Manfredi, Mariangela Lombardi
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Alloy development In-situ alloying Strengthening strategies Super-saturated solid solution Direct aging Precipitation strengthening Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/5981fd15cd9a4ba48be2879461b709a5
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id	oai:doaj.org-article:5981fd15cd9a4ba48be2879461b709a5
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spelling	oai:doaj.org-article:5981fd15cd9a4ba48be2879461b709a52021-11-14T04:28:36ZStrengthening strategies for an Al alloy processed by in-situ alloying during laser powder bed fusion0264-127510.1016/j.matdes.2021.110247https://doaj.org/article/5981fd15cd9a4ba48be2879461b709a52021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0264127521008029https://doaj.org/toc/0264-1275In this work, a high strength Al alloy was successfully processed via in-situ alloying of AlSi10Mg and Cu elemental powders during Laser Powder Bed Fusion. To get superior strength, 4 wt% of Cu was added to AlSi10Mg composition to benefit from the additional solid solution and precipitation strengthening mechanisms induced by Cu atoms. Microstructure, chemical composition, hardness, and tensile properties of as-built samples were firstly determined. The microstructure showed a dual eutectic formed by Si precipitates intermixed with θ-Al2Cu phase. The average Cu concentration was 3.96 ± 0.26 wt% in line with the theoretical one. Hardness and yield strength of AlSi10Mg + 4Cu alloy showed an increase of respectively 8.8 % and 35.6 % compared to the as-built AlSi10Mg, owing to the highly super-saturated solid solution of Si and Cu atoms upon rapid solidification. After that, a direct aging heat-treatment strategy was pursued to fully exploit the potential alloy precipitation by heating as-built samples at temperatures between 160 and 190 °C. A maximum hardness response was achieved after 1 h at 175 °C. The high hardening was primarily attributed to a mix of θ''/θ'+θ-Al2Cu and Si phases coupled with a still high solid solution content. Nevertheless, direct aging slightly decreased the alloy ductility due to the prominent precipitation of brittle Si particles during aging and the presence of Cu inhomogeneities formed after in-situ alloying.Federico BosioPaolo FinoDiego ManfrediMariangela LombardiElsevierarticleAlloy developmentIn-situ alloyingStrengthening strategiesSuper-saturated solid solutionDirect agingPrecipitation strengtheningMaterials of engineering and construction. Mechanics of materialsTA401-492ENMaterials & Design, Vol 212, Iss , Pp 110247- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Alloy development In-situ alloying Strengthening strategies Super-saturated solid solution Direct aging Precipitation strengthening Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Alloy development In-situ alloying Strengthening strategies Super-saturated solid solution Direct aging Precipitation strengthening Materials of engineering and construction. Mechanics of materials TA401-492 Federico Bosio Paolo Fino Diego Manfredi Mariangela Lombardi Strengthening strategies for an Al alloy processed by in-situ alloying during laser powder bed fusion
description	In this work, a high strength Al alloy was successfully processed via in-situ alloying of AlSi10Mg and Cu elemental powders during Laser Powder Bed Fusion. To get superior strength, 4 wt% of Cu was added to AlSi10Mg composition to benefit from the additional solid solution and precipitation strengthening mechanisms induced by Cu atoms. Microstructure, chemical composition, hardness, and tensile properties of as-built samples were firstly determined. The microstructure showed a dual eutectic formed by Si precipitates intermixed with θ-Al2Cu phase. The average Cu concentration was 3.96 ± 0.26 wt% in line with the theoretical one. Hardness and yield strength of AlSi10Mg + 4Cu alloy showed an increase of respectively 8.8 % and 35.6 % compared to the as-built AlSi10Mg, owing to the highly super-saturated solid solution of Si and Cu atoms upon rapid solidification. After that, a direct aging heat-treatment strategy was pursued to fully exploit the potential alloy precipitation by heating as-built samples at temperatures between 160 and 190 °C. A maximum hardness response was achieved after 1 h at 175 °C. The high hardening was primarily attributed to a mix of θ''/θ'+θ-Al2Cu and Si phases coupled with a still high solid solution content. Nevertheless, direct aging slightly decreased the alloy ductility due to the prominent precipitation of brittle Si particles during aging and the presence of Cu inhomogeneities formed after in-situ alloying.
format	article
author	Federico Bosio Paolo Fino Diego Manfredi Mariangela Lombardi
author_facet	Federico Bosio Paolo Fino Diego Manfredi Mariangela Lombardi
author_sort	Federico Bosio
title	Strengthening strategies for an Al alloy processed by in-situ alloying during laser powder bed fusion
title_short	Strengthening strategies for an Al alloy processed by in-situ alloying during laser powder bed fusion
title_full	Strengthening strategies for an Al alloy processed by in-situ alloying during laser powder bed fusion
title_fullStr	Strengthening strategies for an Al alloy processed by in-situ alloying during laser powder bed fusion
title_full_unstemmed	Strengthening strategies for an Al alloy processed by in-situ alloying during laser powder bed fusion
title_sort	strengthening strategies for an al alloy processed by in-situ alloying during laser powder bed fusion
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/5981fd15cd9a4ba48be2879461b709a5
work_keys_str_mv	AT federicobosio strengtheningstrategiesforanalalloyprocessedbyinsitualloyingduringlaserpowderbedfusion AT paolofino strengtheningstrategiesforanalalloyprocessedbyinsitualloyingduringlaserpowderbedfusion AT diegomanfredi strengtheningstrategiesforanalalloyprocessedbyinsitualloyingduringlaserpowderbedfusion AT mariangelalombardi strengtheningstrategiesforanalalloyprocessedbyinsitualloyingduringlaserpowderbedfusion
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Strengthening strategies for an Al alloy processed by in-situ alloying during laser powder bed fusion

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