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 Author | Liu Zhenyu(zyliu@imr.ac.cn) |
2021-01-11 | |
Source Publication | ACTA METALLURGICA SINICA
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ISSN | 0412-1961 |
Volume | 57Issue:1Pages:71-81 |
Abstract | 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. |
Keyword | carbon nanotube (CNT) aluminum matrix composites mechanical property anisotropy high-energy ball milling powder metallurgy |
Funding Organization | 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 |
DOI | 10.11900/0412.1961.2020.00238 |
Indexed By | SCI |
Language | 英语 |
Funding Project | 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 Research Area | Metallurgy & Metallurgical Engineering |
WOS Subject | Metallurgy & Metallurgical Engineering |
WOS ID | WOS:000624917400006 |
Publisher | SCIENCE PRESS |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.imr.ac.cn/handle/321006/161253 |
Collection | 中国科学院金属研究所 |
Corresponding Author | Liu Zhenyu |
Affiliation | 1.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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