The effect of porosity on the microstructural damping response of 6061 aluminium alloy

Zhang, Jianhua; Gungor, M. N.; Lavernia, Enrique J.

doi:10.1007/bf00363342

Cited by 91 publications

(43 citation statements)

References 14 publications

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“…2,24) It can be seen from Fig. 2(a) that the loss factor of the present materials also increased with increasing porosity particularly in the high-strainamplitude range.…”

Section: Resultsmentioning

confidence: 69%

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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“…2,24) It can be seen from Fig. 2(a) that the loss factor of the present materials also increased with increasing porosity particularly in the high-strainamplitude range.…”

Section: Resultsmentioning

confidence: 69%

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

et al. 2009

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“…Since one of the fundamental damping mechanisms in polycrystals is originated by dislocation on grain boundaries and between the primary (α-Mg) and secondary (β-Mg17Al12) phases, rather than lattice dislocations in the grain interior [6], there are opposite damping transformations generated by US treatment. Figure 7a presents the damping peaks extracted from the plots in Figure 6, originated by activation of thermoelastic effects [10]. Considering the values of peak damping, it may be observed that US treatment enhances the internal friction at lower frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…Focusing on the β-Mg17Al12 intermetallic phase, Li et al [10] pointed that the body-centered cubic structure can deteriorate the ultimate tensile strength and elongation. Moreover, according to Du et al [29] the uniform distribution of fine β-Mg17Al12 intermetallic phase enhances mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

“…It is known that the major source of internal friction in Mg alloys is the dislocation motion of basal planes in the hexagonal structure by stress induced inelasticity [32] and this movements are dependent to the grains size [33] and shape [34], presence of secondary phases [35], and porosity [10]. According to Figure 2b and Table 2, it can be observed that the grain size is reduced by US treatment and this is generally a route to enhance internal friction [13].…”

Section: Resultsmentioning

confidence: 99%

“…The value of internal friction is known to be associated with the dislocation properties of metals [9] at low temperatures and with thermal energy at high temperatures, according to thermodynamics and Granato-Lücke dislocation theory [10]. According to Hu et al [11], at room temperature, Mg alloys' internal friction is related to dislocations, while at elevated temperatures some crystal defects must be thermally activated to enhance damping.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ultrasonic Treatment in the Static and Dynamic Mechanical Behavior of AZ91D Mg Alloy

Puga

Carneiro

Barbosa

et al. 2015

Metals

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The present study evaluates the effect of high-intensity ultrasound (US) in the static and dynamic mechanical behavior of AZ91D by microstructural modification. The characterization of samples revealed that US treatment promoted the refinement of dendrite cell size, reduced the thickness, and changed the β-Mg17Al12 intermetallic phase to a globular shape, promoted its uniform distribution along the grain boundaries and reduced the level of porosity. In addition to microstructure refinement, US treatment improved the alloy mechanical properties, namely the ultimate tensile strength (40.7%) and extension (150%) by comparison with values obtained for castings produced without US vibration. Moreover, it is suggested that the internal friction, enhanced by the reduction of grain size, is compensated by the homogenization of the secondary phase and reduction of porosity. It seems that by the use of US treatment, it is possible to enhance static mechanical properties without compromising the damping properties in AZ91D alloys.

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The effect of porosity on the microstructural damping response of 6061 aluminium alloy

Cited by 91 publications

References 14 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

Effect of Ultrasonic Treatment in the Static and Dynamic Mechanical Behavior of AZ91D Mg Alloy

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