Damping in some cellular metalic materials due to microplasticity

Golovin, I.S.; Sinning, H.‐R.; Arhipov, I. K.; Golovin, S. A.; Bram, Martin

doi:10.1016/j.msea.2003.08.089

Cited by 28 publications

(34 citation statements)

References 8 publications

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“…Higher strain amplitude also causes local microplastic deformation in the porous structure. 8,9) Thus, the main damping mechanism of the present materials may be amplitude-dependent dislocation damping.…”

Section: Resultsmentioning

confidence: 95%

“…This trend agreed with the results in previous works. [3][4][5][6][7][8][9] Also, specimen F with a residual porosity of 13.4% showed a higher damping capacity than dense Al when measured under similar testing conditions. 6) It has been pointed out that the amplitude of porous Al is inversely proportional to the pore size, [3][4][5][6] although a very weak sensitivity of pore size dependence has also been reported for porous steel.…”

Section: Resultsmentioning

confidence: 99%

“…Amplitudedependent damping in porous metals and alloys is often related to dislocation-related damping. [3][4][5][6][7][8][9] If the strain amplitude of the specimen is sufficiently low, the dislocation line is held by weak pinners and undergoes damped motion. 23) This type of dislocation damping is amplitudeindependent.…”

Section: Resultsmentioning

confidence: 99%

“…1) Recently, it has been reported that the damping capacities of porous metals are enhanced, compared with those of dense materials. [2][3][4][5][6][7][8][9][10] Although pure Al or Al alloy is essentially a low damping material, [11][12][13] porous Al is of considerable practical interest as a damping material in severe conditions because of its lightweight and good corrosion resistance as well as its excellent damping capacity. In general, pore characteristics, such as porosity, pore size and pore shape, of the porous structure influence the damping capacity of cellular metallic materials.…”

Section: Introductionmentioning

confidence: 99%

“…However, there are some discrepancies in the dependence of the damping capacity on the pore characteristics. [3][4][5][6][7][8][9] Past relevant studies have mostly focused on the mechanical damping of foamed Al. [3][4][5]7) Foamed Al often suffers from heterogeneous pore characteristics because control of bubble expansion in liquid or semisolid metal is difficult.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effects of Pore Characteristics Finely-Controlled by Spacer Method on Damping Capacity of Porous Aluminum

et al. 2009

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The room-temperature damping properties of porous aluminum fabricated by the spacer method were investigated using the method of lateral resonant vibration in cantilever holding. In particular, the effects of the porosity and pore size, which are the representative parameters of porous metals and can be controlled well by spacer method, on the damping properties were focused on. The damping capacity increased with increasing porosity and pore size. Local stress concentration arising from the heterogeneity of porous structures seems responsible for the enhanced damping capacity under the condition in which the main damping mechanism is amplitude-dependent dislocation damping. The present results point out the importance of the porous structure control in damping properties.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Pore Characteristics Finely-Controlled by Spacer Method on Damping Capacity of Porous Aluminum

et al. 2009

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Damping behavior of a novel porous CuAlMn shape memory alloy fabricated by sintering‐dissolution method

Wang

Cui

et al. 2011

Physica Status Solidi (a)

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60204125A novel porous Cu-11.7Al-2.49Mn (wt%) shape memory alloy (SMA) was fabricated by sintering-dissolution method. Damping behavior of the resulting specimen was investigated by internal friction (IF) technique through the method of forced vibration. An IF peak arises at around 200 8C during heating. This peak has been ascribed to the reverse martensitic transformation (MT). Heat treatments of solution and quenching have important influences on the IF background and the IF peak due to the changes of microstructures and phase constitution of the matrix. Compared with bulk specimen, the porous specimen has a significantly enhanced IF background and a decreased IF peak. It is suggested that the enhancement of IF background originates from the effect of pores and the production as well as movement of dislocations, while the decrease of IF peak from the existence of multifarious defects around pores.

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Damping Capacities of Porous Mg–based Ternary Alloys Prepared by a Stir–casting Method

et al. 2018

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A new approach for preparing porous Mg–Al–Sr ternary alloys has been proposed using stir–casting method. Experimental results indicate that porosity and pore diameters have close relation with chemical composition of Mg–based ternary alloys. The proposed formation mechanism of pores in Mg–based ternary alloys can be described as that the oxidization reaction between [Sr] and O2 in air provides enough heat source to vaporize small amount of Mg–based ternary alloys, while the vaporized products promote formation of embodied pores with various sizes and shapes in Mg–based ternary alloys during solidification process. Meanwhile, some oxides in shape of sheets will be formed and precipitated, while other oxides will also be precipitated on surface of pore wall during cooling. Moreover, the measured damping capacities expressed by internal friction tan δ indicate that changing temperature from ambient temperature to 343 K cannot cause a large effect on damping capacities, however the inverse V–shape plots of damping capacities against temperature from 343 to 573 K are obtained. In addition, increasing vibration frequencies can result in a decrease of internal friction tan δ. The optimized chemical composition as 50%Mg–47%Al–3%Sr and 50%Mg–45%Al–5%Sr are recommended for Mg–based ternary alloys with greater porosity and higher damping performance under temperature and vibration frequency.

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Damping in some cellular metalic materials due to microplasticity

Cited by 28 publications

References 8 publications

Effects of Pore Characteristics Finely-Controlled by Spacer Method on Damping Capacity of Porous Aluminum

Effects of Pore Characteristics Finely-Controlled by Spacer Method on Damping Capacity of Porous Aluminum

Damping behavior of a novel porous CuAlMn shape memory alloy fabricated by sintering‐dissolution method

Damping Capacities of Porous Mg–based Ternary Alloys Prepared by a Stir–casting Method

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