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

doi:10.3390/met11111866

	Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys
	Song, Zhao-Xi 1; Li, Yuan-Dong 1,2; Liu, Wen-Jing 1; Yang, Hao-Kun 1; Cao, Yang-Jing 1; Bi, Guang-Li 1,2
刊名	METALS
	2021-11-01
卷号	11 期号:11
关键词	Al-Cu alloy mircrostructure mechanical properties thermal conductivity first-principles
DOI	10.3390/met11111866
英文摘要	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 mu m) and 63.3% (119.64 mu m) 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 center dot m(-1)center dot k(-1)) and 6.5% (12.178 W center dot m(-1)center dot k(-1)) higher than Al-Cu alloy respectively. Compared with Al-Cu, Al-Cu-La has less shrinkage and porosity, the presence of Al4La and AlCu3 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 Al3Sc and AlCuSc bring about the increase of specific heat capacity and brittleness.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	MDPI
WOS记录号	WOS:000815300700001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158858]
专题	材料科学与工程学院
作者单位	1.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China; 2.Lanzhou Univ Technol, Key Lab Non Ferrous Met Alloys & Proc, Minist Educ, Lanzhou 730050, Peoples R China
推荐引用方式 GB/T 7714	Song, Zhao-Xi,Li, Yuan-Dong,Liu, Wen-Jing,et al. Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys[J]. METALS,2021,11(11).
APA	Song, Zhao-Xi,Li, Yuan-Dong,Liu, Wen-Jing,Yang, Hao-Kun,Cao, Yang-Jing,&Bi, Guang-Li.(2021).Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys.METALS,11(11).
MLA	Song, Zhao-Xi,et al."Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys".METALS 11.11(2021).