Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms

The mechanical deformation of cellular structures in the selective laser melting (SLM) of aluminum was investigated by performing a series of molecular dynamics (MD) simulations of uniaxial tension tests. The effects of crystalline form, temperature, and grain orientation of columnar grains on the m...

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Autores principales:	Qiang Zeng, Lijuan Wang, Wugui Jiang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	selective laser melting aluminum crystalline state grain orientation molecular dynamics Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/94aa44765f434733864588f5187251cd
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spelling	oai:doaj.org-article:94aa44765f434733864588f5187251cd2021-11-25T17:19:14ZMolecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms10.3390/cryst111113882073-4352https://doaj.org/article/94aa44765f434733864588f5187251cd2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1388https://doaj.org/toc/2073-4352The mechanical deformation of cellular structures in the selective laser melting (SLM) of aluminum was investigated by performing a series of molecular dynamics (MD) simulations of uniaxial tension tests. The effects of crystalline form, temperature, and grain orientation of columnar grains on the mechanical properties of SLM aluminum were examined. The MD results showed that the tensile strength of SLM aluminum with columnar grains at different temperatures was lower than that of single-crystal aluminum, but greater than that of aluminum with equiaxed grains. The tensile strength and Young’s modulus both decreased approximately linearly upon increasing the temperature. The deformation mechanisms of equiaxed and columnar grains included dislocation slip, grain boundary migration, and torsion, while the deformation mechanisms of single crystals included stacking fault formation and amorphization. Finally, the influence of the columnar grain orientation on the mechanical properties was studied, and it was found that the Young’s modulus was almost independent of the grain orientation. The tensile strength was greatly affected by the columnar grain orientation. Reasonable control of the grain orientation can improve the tensile strength of SLM aluminum.Qiang ZengLijuan WangWugui JiangMDPI AGarticleselective laser meltingaluminumcrystalline stategrain orientationmolecular dynamicsCrystallographyQD901-999ENCrystals, Vol 11, Iss 1388, p 1388 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	selective laser melting aluminum crystalline state grain orientation molecular dynamics Crystallography QD901-999
spellingShingle	selective laser melting aluminum crystalline state grain orientation molecular dynamics Crystallography QD901-999 Qiang Zeng Lijuan Wang Wugui Jiang Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms
description	The mechanical deformation of cellular structures in the selective laser melting (SLM) of aluminum was investigated by performing a series of molecular dynamics (MD) simulations of uniaxial tension tests. The effects of crystalline form, temperature, and grain orientation of columnar grains on the mechanical properties of SLM aluminum were examined. The MD results showed that the tensile strength of SLM aluminum with columnar grains at different temperatures was lower than that of single-crystal aluminum, but greater than that of aluminum with equiaxed grains. The tensile strength and Young’s modulus both decreased approximately linearly upon increasing the temperature. The deformation mechanisms of equiaxed and columnar grains included dislocation slip, grain boundary migration, and torsion, while the deformation mechanisms of single crystals included stacking fault formation and amorphization. Finally, the influence of the columnar grain orientation on the mechanical properties was studied, and it was found that the Young’s modulus was almost independent of the grain orientation. The tensile strength was greatly affected by the columnar grain orientation. Reasonable control of the grain orientation can improve the tensile strength of SLM aluminum.
format	article
author	Qiang Zeng Lijuan Wang Wugui Jiang
author_facet	Qiang Zeng Lijuan Wang Wugui Jiang
author_sort	Qiang Zeng
title	Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms
title_short	Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms
title_full	Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms
title_fullStr	Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms
title_full_unstemmed	Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms
title_sort	molecular dynamics simulations of the tensile mechanical responses of selective laser-melted aluminum with different crystalline forms
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/94aa44765f434733864588f5187251cd
work_keys_str_mv	AT qiangzeng moleculardynamicssimulationsofthetensilemechanicalresponsesofselectivelasermeltedaluminumwithdifferentcrystallineforms AT lijuanwang moleculardynamicssimulationsofthetensilemechanicalresponsesofselectivelasermeltedaluminumwithdifferentcrystallineforms AT wuguijiang moleculardynamicssimulationsofthetensilemechanicalresponsesofselectivelasermeltedaluminumwithdifferentcrystallineforms
_version_	1718412546122186752

Molecular Dynamics Simulations of the Tensile Mechanical Responses of Selective Laser-Melted Aluminum with Different Crystalline Forms

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