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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 Sheng1,2; Li Zechen3; Sun Haixia3; Song Baoyong3; Liu Zhenyu1; Xiao Bolv1; Ma Zongyi1
Corresponding AuthorLiu Zhenyu(zyliu@imr.ac.cn)
2021-01-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume57Issue:1Pages:71-81
AbstractIn 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.
Keywordcarbon nanotube (CNT) aluminum matrix composites mechanical property anisotropy high-energy ball milling powder metallurgy
Funding OrganizationNational 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
DOI10.11900/0412.1961.2020.00238
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000624917400006
PublisherSCIENCE PRESS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/161250
Collection中国科学院金属研究所
Corresponding AuthorLiu Zhenyu
Affiliation1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Beijing Inst Aerosp Syst Engn, Beijing 100076, Peoples R China
Recommended Citation
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.
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