碳纳米管增强开孔铝基复合泡沫的疲劳性能

林森; 杨旭东; 刘冠甫; 胡琪; 沙军威

doi:10.13801/j.cnki.fhclxb.20201110.003

碳纳米管增强开孔铝基复合泡沫的疲劳性能

doi: 10.13801/j.cnki.fhclxb.20201110.003

林森^1,,
杨旭东^1, ,,
刘冠甫^1,,
胡琪^1,,
沙军威^2,

1.
中国民航大学　中欧航空工程师学院，天津 300300
2.
天津大学　材料科学与工程学院，天津 300350

基金项目: 国家自然科学基金(51971242)；大学生创新创业训练计划项目(201910059036)

详细信息

通讯作者:
杨旭东，博士，副教授，硕士生导师，研究方向为泡沫铝及铝基复合材料　 E-mail：xdyangtj@163.com

中图分类号: TB331；TB333
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- 被引次数: 0
出版历程
- 收稿日期: 2020-08-27
- 录用日期: 2020-11-02
- 网络出版日期: 2020-11-10
- 刊出日期: 2021-08-15

Fatigue performance of open-cell aluminium matrix composite foams reinforced by carbon nanotubes

LIN Sen^1
,,
YANG Xudong^{1
, ,},
LIU Guanfu^1
,,
HU Qi^1
,,
SHA Junwei^2
,

1.
Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China
2.
School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China

摘要

摘要: 采用原位化学气相沉积、短时球磨和填加造孔剂法相结合的工艺制备了碳纳米管(CNTs)/Al复合泡沫，研究了其在压缩-压缩循环载荷下的力学性能及失效机制。结果表明，CNTs/Al复合泡沫的应变-循环次数曲线经历线弹性、应变硬化及应变快速增长三个阶段。不同于泡沫铝的逐层坍塌变形失效模式，CNTs/Al复合泡沫疲劳失效的主要原因是大量剪切变形带的形成，试样出现快速的塑性变形。此外，CNTs含量为2.5wt%、孔隙率为60%的复合泡沫试样的疲劳强度相比于泡沫铝提高了92%。CNTs的均匀分布及增强相与基体材料之间良好的界面结合性保证了疲劳载荷能够以剪切力的形式从基体传递到CNTs上，使其充分发挥自身高强度、高韧性的特点，进而提高了疲劳性能。
- 泡沫铝 /
- 碳纳米管 /
- 压缩疲劳 /
- 失效机制 /
- 增强机制
Abstract: Carbon nanotubes (CNTs) reinforced Al matrix composites were fabricated by spacer-holder method, including in-situ chemical vapor deposition and ball milling process. The mechanical properties and failure mechanisms of the CNTs/Al composite foams were investigated under compression-compression cyclic loading. The results show that the strain-number of cycle curves of the CNTs/Al composite foams is composed of three stages: elastic stage, strain hardening stage and rapid accumulation stage, which is similar to Al foams. Different from Al foams' deformation of layer-by-layer, the main failure modes of CNTs/Al composite foams are the collapse of pores within significant shear deformation bands under fatigue loading and rapid plastic deformation of the specimens. In addition, the fatigue strength of the CNTs/Al composite foams with CNTs content of 2.5wt% and porosity of 60% increases by 92% than Al foams. The CNTs/Al composites exhibit uniform CNTs distribution and good interfacial bonding between CNTs and Al matrix, which guarantees the effective transmission of fatigue loading in the way of shear stress from Al matrix to CNTs, so that the CNTs can give full play to the characteristics of high strength and high toughness, and then improve the fatigue performance.
- aluminum foams /
- carbon nanotubes /
- compression fatigue /
- failure mechanism /
- enhancement mechanism

HTML全文

图 1 2.5wt%碳纳米管(CNTs)/Al复合泡沫的宏观形貌 (a) 和SEM图像((b), (c)) 及TEM图像 (d)

Figure 1. Macrostructure (a), SEM images ((b), (c)) and TEM image (d) of 2.5wt% carbon nanotubes (CNTs)/Al composite foams

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图 2 泡沫铝和2.5wt%CNTs/Al复合泡沫的准静态压缩应力-应变曲线 (a) 与吸能曲线 (b)

Figure 2. Quasi-static compression curves (a) and energy absorption curves (b) of 2.5wt% CNTs/Al composite foams and Al foams

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图 3 2.5wt%CNTs/Al复合泡沫的准静态压缩变形过程

Figure 3. Quasi-static compression deformation process of 2.5wt% CNTs/Al composite foams

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图 4 泡沫铝 (a) 与2.5wt%CNTs/Al复合泡沫 (b) 的应变-循环次数曲线

Figure 4. Strain-number of cycle(ε–N) curves of Al foams (a) and 2.5wt% CNTs/Al composite foams (b)

k—Stress level

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图 5 泡沫铝与2.5wt%CNTs/Al复合泡沫试样的应力水平-疲劳寿命曲线

Figure 5. Stress level-fatigue life curves of Al foams and 2.5wt%CNTs/Al composite foams

σ_max—Maximum load corresponding to the sample after 10 cycles without failure; N_f—Fatigue life of composite foam

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图 6 应力水平k=0.8时2.5wt%CNTs/Al复合泡沫的压缩-压缩疲劳变形过程

Figure 6. Compression-compression fatigue deformation process of 2.5wt% CNTs/Al composite foams when stress level k=0.8

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图 7 应力水平k=0.8时泡沫铝 ((a)~(c)) 和2.5wt%CNTs/Al复合泡沫 ((d)~(f)) 疲劳断口的SEM图像

Figure 7. SEM images of the fatigue fracture of pure Al foams ((a)-(c)) and 2.5wt%CNTs/Al composite foams ((d)-(f)) when stress level k=0.8

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图 8 2.5wt%CNTs/Al复合泡沫疲劳断口韧窝的SEM图像

Figure 8. SEM images of dimples at the fatigue fracture of 2.5wt%CNTs/Al composite foams

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图 9 CNTs/Al复合泡沫的拉曼光谱

Figure 9. Raman spectra of the CNTs/Al composite foams

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表 1 泡沫铝和2.5wt%CNTs/Al复合泡沫的压缩性能

Table 1. Compression performance of Al foams and 2.5wt% CNTs/Al composite foams

Component	σ_s/MPa	σ_pl/MPa	ε_d/%	Eε_d/(MJ·m⁻³)
Al foams	10.94±1.08	18.40±1.11	62.25±4.84	12.59
Composite foams	24.03±0.91	19.36±1.33	67.33±5.34	16.51
Notes: σ_s—First maximum stress on the stress-strain curve; σ_pl—Stress between 20% and 40% compressive strain; ε_d—Strain corresponding to the intersection of the tangent lines of the yield plateau stage and densification stage; Eε_d—Energy absorption at ε=60%.

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