Preparation and mechanical properties of closed-cell CNTs-reinforced Al composite foams by friction stir welding

Pang, Qiu; Hu, Zhili; Song, Jianrong

doi:10.1007/s00170-019-03765-4

Cited by 19 publications

(6 citation statements)

References 29 publications

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“…CNTs can refine the grains of the Al matrix, growing the grain boundary and phase boundary. [17] The metallography in Figure 5 exhibits that the grains of C-AMCFs are refined after the addition of CNTs, which confirms this conclusion. Meantime, the effective movement of electrons is hindered in the boundary hinders by changing its transport path.…”

Section: Electromagnetic Shielding Mechanismsupporting

confidence: 64%

“…[13] Recently, more focus had been paid to nano-sized reinforcement such as carbon nanotubes (CNTs), graphene, and ceramic nano-particles. [5,8,[14][15][16][17][18][19][20][21][22] Among them, CNTs-reinforced Al matrix composite foams (C-AMCFs) have been proven to have the potential of forming lightweight and high-performance materials due to the outstanding mechanical performance and the physical properties of CNTs. [23,24] CNTs can play the role of grain refinement, load transfer strengthening, and dislocation-strengthening mechanism in the metal matrix.…”

Section: Introductionmentioning

confidence: 99%

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Compression, Energy Absorption, and Electromagnetic Shielding Properties of Carbon Nanotubes/Al Composite Foams

Shao

Yang

et al. 2022

Adv Eng Mater

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Herein, pre‐dispersed ball‐milling and space‐holder methods are used to prepare carbon nanotubes (CNTs) reinforced aluminum (Al) matrix composite foams (C‐AMCFs). Systematic research is conducted on the mechanical and electromagnetic shielding properties of C‐AMCFs as well as the optimal ball‐milling time. The results demonstrate a quasi‐linear relationship between CNTs contents and optimal ball‐milling time. With the addition of CNTs, the compressive performances of C‐AMCFs first increase and subsequently decrease. The 2.5 wt% C‐AMCFs have the best mechanical performance, whose yield strength (19.25 MPa), plateau stress (20.87 MPa), and energy absorption capacity (8.874 MJ m−3), are both 1.72, 1.72, and 1.79 times than those of AFs, respectively. In the X‐band (8.2–12.4 GHz), the addition of CNTs in C‐AMCFs can increase their electromagnetic shielding effectiveness. The greatest electromagnetic shielding effectiveness of the 2.0 wt% C‐AMCFs is 30–40 dB. By enhancing the reflection loss at the first interface as well as the absorption and reflection loss inside the cell walls, CNTs play an important role in improving the electromagnetic shielding performance of C‐AMCFs.

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Section: Electromagnetic Shielding Mechanismsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Compression, Energy Absorption, and Electromagnetic Shielding Properties of Carbon Nanotubes/Al Composite Foams

Shao

Yang

et al. 2022

Adv Eng Mater

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“…[1][2][3][4][5][6][7][8] Especially, the closed-cell Al foams, which are typically fabricated through three manufacturing methods: gas injection method, melt foaming (MF) method, and powder metallurgy foaming (PMF) method, exhibit not only lightweight property, but also excellent strength, stiffness, and impact energy absorbing capacity when subjected to external loads. [9][10][11][12][13][14] It is known that the energy absorption capacity of Al foams is mainly determined by the cellular structure and matrix properties. [11,15] However, the intrinsic restrictions of physical metallurgical characteristics and mechanical properties of Al foams hinder the industrial applications for engineering components.…”

Section: Introductionmentioning

confidence: 99%

Controllable Design of Structural and Mechanical Behaviors of Al–Si Foams by Powder Metallurgy Foaming

Yang

Xie

et al. 2022

Adv Eng Mater

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“…The stabilization agent powder can be mixed into the die casting plates to fabricate the precursor by intense plastic deformation and stirring of pin tool. Then the porous aluminums are successfully obtained by heat treatment of the precursor [15,16] . However, till to present, the effects of process parameters on microstructures of closed-cell Al foam precursor are not analyzed in detail.…”

Section: Introductionmentioning

confidence: 99%

The influence of process parameters on the preparation of closed-cell aluminum foam by friction stir processing

Pang

2022

Int J Adv Manuf Technol

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In the present investigation, the closed-cell Al foam was fabricated by friction stir processing (FSP) combined with heat treatment. The influences of process parameters on microstructures of closed-cell Al foam precursor were investigated by optical metallographic microscope and scanning electronic microscope (OM/SEM). Fluent CFD software was developed to simulate the temperature field and flow field in friction stir processing. The cupping test values were compared for base metal and different weld passes. The results show that the welding speeds have little effect on the mixing of powder in the stir zone because of the relatively small welding heat input. However, the pore size and pore morphology are highly sensitive to change in the rotating speeds. When the welding speed is 50mm/min and the rotating speed is 2000rpm, the powder ring is continuous and uniform due to sufficient plastic deformation and flow. When the foaming time is 110s, the expansion rate of the whole foam increases rapidly, and the diameter of the pore is uniform. Numerical simulation shows that the welding heat mainly comes from the shoulder of the stirring head and the welding temperature peak appears near the stirring pin. The maximum flow velocity appears at the outer edge of the shaft shoulder in which the aluminum matrix is softened preferentially. When the rotating speed increases to 2000r/min, the velocity of the outermost edge of the shaft shoulder increases by 59.96%, and the maximum temperature at the stirring pin reaches 491℃ which is consistent with the experimental results. The formability of the joint interface is improved. The cupping test values increase with the increase of deformation temperature. Especially the cupping test value of foamed preform is close to that of base metal at 450℃.

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Preparation and mechanical properties of closed-cell CNTs-reinforced Al composite foams by friction stir welding

Cited by 19 publications

References 29 publications

Compression, Energy Absorption, and Electromagnetic Shielding Properties of Carbon Nanotubes/Al Composite Foams

Compression, Energy Absorption, and Electromagnetic Shielding Properties of Carbon Nanotubes/Al Composite Foams

Controllable Design of Structural and Mechanical Behaviors of Al–Si Foams by Powder Metallurgy Foaming

The influence of process parameters on the preparation of closed-cell aluminum foam by friction stir processing

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