Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys

The effects of La and La+Sc addition on mechanical properties and thermal conductivity of Al-4.8Cu alloy were comprehensively studied. The as-cast samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and first-principles methods. The resu...

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Autores principales:	Zhao-Xi Song, Yuan-Dong Li, Wen-Jing Liu, Hao-Kun Yang, Yang-Jing Cao, Guang-Li Bi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Al-Cu alloy mircrostructure mechanical properties thermal conductivity first-principles Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/568e3022e48e43a299bc4b7ee7b95007
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spelling	oai:doaj.org-article:568e3022e48e43a299bc4b7ee7b950072021-11-25T18:22:31ZEffect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys10.3390/met111118662075-4701https://doaj.org/article/568e3022e48e43a299bc4b7ee7b950072021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1866https://doaj.org/toc/2075-4701The effects of La and La+Sc addition on mechanical properties and thermal conductivity of Al-4.8Cu alloy were comprehensively studied. The as-cast samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and first-principles methods. The results reveal that the grain morphology of Al-4.8Cu alloy changes from dendrite to fine equiaxed grain with La, La+Sc addition. The average grain size of Al-Cu-La (Al-4.8Cu-0.4La) and Al-Cu-La-Sc (Al-4.8Cu-0.4La-0.4Sc) decreased by 37.2% (70.36 μm) and 63.3% (119.64 μm) respectively compared with Al-Cu (Al-4.8Cu). Al-Cu-La has the highest elongation among the three which is 34.4% (2.65%) higher than Al-Cu. Al-Cu-La-Sc has the highest ultimate tensile strength and yield strength which are 55.1% (80.9 MPa) and 65.2% (62.1 MPa) higher than Al-Cu, respectively. The thermal conductivity of Al-Cu-La and Al-Cu-La-Sc is 10.0% (18.797 W·m<sup>−1</sup>·k<sup>−1</sup>) and 6.5% (12.178 W·m<sup>−1</sup>·k<sup>−1</sup>) higher than Al-Cu alloy respectively. Compared with Al-Cu, Al-Cu-La has less shrinkage and porosity, the presence of Al<sub>4</sub>La and AlCu<sub>3</sub> contribute a lot to the decrease of specific heat capacity and the increase of plasticity and toughness. The porosity of Al-Cu-La-Sc does not significantly decrease compared with Al-Cu-La, the presence of Al<sub>3</sub>Sc and AlCuSc bring about the increase of specific heat capacity and brittleness.Zhao-Xi SongYuan-Dong LiWen-Jing LiuHao-Kun YangYang-Jing CaoGuang-Li BiMDPI AGarticleAl-Cu alloymircrostructuremechanical propertiesthermal conductivityfirst-principlesMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1866, p 1866 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Al-Cu alloy mircrostructure mechanical properties thermal conductivity first-principles Mining engineering. Metallurgy TN1-997
spellingShingle	Al-Cu alloy mircrostructure mechanical properties thermal conductivity first-principles Mining engineering. Metallurgy TN1-997 Zhao-Xi Song Yuan-Dong Li Wen-Jing Liu Hao-Kun Yang Yang-Jing Cao Guang-Li Bi Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys
description	The effects of La and La+Sc addition on mechanical properties and thermal conductivity of Al-4.8Cu alloy were comprehensively studied. The as-cast samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and first-principles methods. The results reveal that the grain morphology of Al-4.8Cu alloy changes from dendrite to fine equiaxed grain with La, La+Sc addition. The average grain size of Al-Cu-La (Al-4.8Cu-0.4La) and Al-Cu-La-Sc (Al-4.8Cu-0.4La-0.4Sc) decreased by 37.2% (70.36 μm) and 63.3% (119.64 μm) respectively compared with Al-Cu (Al-4.8Cu). Al-Cu-La has the highest elongation among the three which is 34.4% (2.65%) higher than Al-Cu. Al-Cu-La-Sc has the highest ultimate tensile strength and yield strength which are 55.1% (80.9 MPa) and 65.2% (62.1 MPa) higher than Al-Cu, respectively. The thermal conductivity of Al-Cu-La and Al-Cu-La-Sc is 10.0% (18.797 W·m<sup>−1</sup>·k<sup>−1</sup>) and 6.5% (12.178 W·m<sup>−1</sup>·k<sup>−1</sup>) higher than Al-Cu alloy respectively. Compared with Al-Cu, Al-Cu-La has less shrinkage and porosity, the presence of Al<sub>4</sub>La and AlCu<sub>3</sub> contribute a lot to the decrease of specific heat capacity and the increase of plasticity and toughness. The porosity of Al-Cu-La-Sc does not significantly decrease compared with Al-Cu-La, the presence of Al<sub>3</sub>Sc and AlCuSc bring about the increase of specific heat capacity and brittleness.
format	article
author	Zhao-Xi Song Yuan-Dong Li Wen-Jing Liu Hao-Kun Yang Yang-Jing Cao Guang-Li Bi
author_facet	Zhao-Xi Song Yuan-Dong Li Wen-Jing Liu Hao-Kun Yang Yang-Jing Cao Guang-Li Bi
author_sort	Zhao-Xi Song
title	Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys
title_short	Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys
title_full	Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys
title_fullStr	Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys
title_full_unstemmed	Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys
title_sort	effect of la and sc co-addition on the mechanical properties and thermal conductivity of as-cast al-4.8% cu alloys
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/568e3022e48e43a299bc4b7ee7b95007
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Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys

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