Microstructure and Mechanical Properties of Carbon Nanotubes-Reinforced 7055Al Composites Fabricated by High-Energy Ball Milling and Powder Metallurgy Processing

doi:10.11900/0412.1961.2020.00238

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	Microstructure and Mechanical Properties of Carbon Nanotubes-Reinforced 7055Al Composites Fabricated by High-Energy Ball Milling and Powder Metallurgy Processing
	Bi Sheng 1,3; Li Zechen 2; Sun Haixia 2; Song Baoyong 2; Liu Zhenyu 3; Xiao Bolv 3; Ma Zongyi 3
刊名	ACTA METALLURGICA SINICA
	2021-01-11
卷号	57 期号:1 页码:71-81
关键词	carbon nanotube (CNT) aluminum matrix composites mechanical property anisotropy high-energy ball milling powder metallurgy
ISSN号	0412-1961
DOI	10.11900/0412.1961.2020.00238
通讯作者	Liu Zhenyu(zyliu@imr.ac.cn)
英文摘要	In the recent years, lightweight and high-strength structural materials have gained much attention in engineering applications. Carbon nanotube (CNT)-reinforced Al (CNT/Al) composites are promising structural materials owing to the good mechanical properties and high reinforcing efficiency of CNTs. Previous studies on these composites mainly focused on fabricating CNT-reinforced low-strength or medium-high-strength Al alloys (such as pure Al, or 2xxx series or 6xxx series Al alloys) composites via various dispersion methods. However, only few studies investigated composites with super-high-strength Al alloys as the matrices. In the present work, CNT/7055Al composites with CNT volume fractions of 0%, 1%, and 3% were prepared by high-energy ball milling combined with powder metallurgy. The CNT distribution, grain structure, interface, and mechanical properties of the CNT/7055Al composite were investigated using OM, SEM, TEM, and tensile tests. The strengthening mechanism and anisotropy of the composite were analyzed. The results indicated that the composite had a bimodal grain structure consisting of CNT-free coarse grain zones and CNT-enriched ultrafine grain zones. CNTs were well dispersed in the ultrafine grain zones of the Al matrix, and the CNT/Al interface was clean. There were only few reaction products at the interface. The tensile strength of the 3%CNT/7055Al composite reached 816 MPa, but the elongation was only 0.5%. Grain refinement and Orowan strengthening were the main strengthening mechanisms of the CNT/7055Al composite. Because of the load transfer efficiency of CNTs and a coarse grain band structure, the composite exhibited stronger anisotropy than the matrix alloy. The tensile properties of the CNT/7055Al composite normal to the extrusion direction were weaker than those in the extrusion direction.
资助项目	National Natural Science Foundation of China[51931009] ; National Natural Science Foundation of China[51871214] ; National Natural Science Foundation of China[51871215] ; National Key Research and Development Program of China[2017YFB0703104] ; Key Research Program of Frontier Sciences, CAS[QYZDJ-SSW-JSC015] ; Youth Innovation Promotion Association CAS[2020197]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000624917400006
资助机构	National Natural Science Foundation of China ; National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, CAS ; Youth Innovation Promotion Association CAS
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/161249]
专题	金属研究所_中国科学院金属研究所
通讯作者	Liu Zhenyu
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Beijing Inst Aerosp Syst Engn, Beijing 100076, Peoples R China 3.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Bi Sheng,Li Zechen,Sun Haixia,et al. Microstructure and Mechanical Properties of Carbon Nanotubes-Reinforced 7055Al Composites Fabricated by High-Energy Ball Milling and Powder Metallurgy Processing[J]. ACTA METALLURGICA SINICA,2021,57(1):71-81.
APA	Bi Sheng.,Li Zechen.,Sun Haixia.,Song Baoyong.,Liu Zhenyu.,...&Ma Zongyi.(2021).Microstructure and Mechanical Properties of Carbon Nanotubes-Reinforced 7055Al Composites Fabricated by High-Energy Ball Milling and Powder Metallurgy Processing.ACTA METALLURGICA SINICA,57(1),71-81.
MLA	Bi Sheng,et al."Microstructure and Mechanical Properties of Carbon Nanotubes-Reinforced 7055Al Composites Fabricated by High-Energy Ball Milling and Powder Metallurgy Processing".ACTA METALLURGICA SINICA 57.1(2021):71-81.