Mechanical properties and strain hardening behavior of aluminum matrix composites reinforced with few-walled carbon nanotubes
Mechanical properties and strain hardening behavior of aluminum matrix composites reinforced with few-walled carbon nanotubes
复制标题
少壁碳纳米管增强铝基复合材料的力学性能及应变硬化行为
DOI：
10.1016/j.jallcom.2020.154075
复制
发表时间：
2020-06-15
影响因子：
6.2
通讯作者：
Li, J. S.
中科院分区：
文献类型：
--
作者：
Chen, B.;Li, Z.;Li, J. S.
In this study, for the first time few-walled carbon nanotubes (FWCNTs) with similar to 3 walls were used as reinforcements in fabricating high performance aluminum matrix composites (AMCs). FWCNTs/Al composites and referential Al materials were prepared by a powder metallurgy route consisting of high energy ball milling, spark plasma sintering (SPS) and subsequent hot extrusion. It is found that, by decreasing SPS temperature and time, FWCNTs/Al composites showed reduced grains with an increased dislocation density and improved structural integrity of FWCNTs, leading to an increased tensile strength. Meanwhile, comparatively high strain hardening rates and long strain softening behavior were observed after necking in the sample sintered at 500 degrees C, which resulted in a tensile elongation of 11.7% with a high yield strength of 382 MPa. The experimental results suggested that, compared with traditional multi-walled carbon nano-tubes (MWCNTs), FWCNTs showed a noticeably enhanced strengthening effect and provided a good balance of strength and ductility in Al composites. It may make FWCNTs a good reinforcement candidate for metal matrix composites to achieve improved mechanical properties. (C) 2020 Elsevier B.V. All rights reserved.
