Low frequency internal friction associated with precipitation in AlMgSi alloys

Xie, C.Y.; Carreño-Morelli, E.; Schaller, R.

doi:10.1016/s1359-6462(98)00158-4

Cited by 14 publications

(4 citation statements)

References 13 publications

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“…2) In the past decade, several research works have been devoted to the vibration behavior of Al-Mg-Si alloys. [3][4][5][6] With respect to the effect of aging conditions, it was found that aging conditions significantly affect the resonant vibration properties, such as vibration deformation feature and damping capacity. The peak aged samples possess a poor damping capacity mainly due to the decrease in dislocation mobility.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characteristics and Vibration Fracture Properties of Al-Mg-Si Alloys with Excess Cu and Ni

2007

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This study investigated the effect of co-addition of Cu and Ni on the microstructure and vibration properties of Al-Mg-Si alloys. The results show that additions of Cu and Ni resulted in the formation of Al 3 (Ni,Cu) phase, a harder Al matrix and an accelerated aging rate. Nanoindentation analysis indicates that the Al 3 (Ni,Cu) phase exhibits a hardness of 7.7 GPa and Young's modulus of 141.2 GPa. Due to the increased modulus by reinforcement effect of Al 3 (Ni,Cu), the alloyed samples possessed a higher resonant frequency. However, the damping capacity was reduced with alloying because of the hardened matrix. It was also found that since microcracks could be generated from the irregular-shaped Al 3 (Ni,Cu) in the vicinity of the tip of the main crack when suffering vibration deformation, the crack propagation resistance of the alloyed samples was inferior.

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Section: Introductionmentioning

confidence: 99%

Microstructural Characteristics and Vibration Fracture Properties of Al-Mg-Si Alloys with Excess Cu and Ni

2007

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“…The anelastic relaxation peak fig. 4, may be tentatively identified with the one observed in AlMgSi alloys [9] and attributed to a dragging by Mg solutes or MgSi complexex, of dislocation loops, strongly pinned by precipitates. Anyway the peak relaxation strength increase observed in both the B and R samples overaged and ECA pressed Fig.…”

Section: Discussionmentioning

confidence: 66%

Anelasticity and Structural Stability of ECAP Processed Al-Mg-Si Alloys Investigated by Mechanical Spectroscopy

Amadori

Pasquini

Bonetti

et al. 2006

MSF

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Mechanical spectroscopy was employed to investigate the microstructure evolution of a Zr-modified 6082 Al-Mg-Si alloy and the same alloy with Sc addition after ageing and following severe plastic deformation through equal channel angular pressing. Measurements of the internal friction and dynamic young modulus have been performed in isothermal and isochronal runs in the frequency range 0.1 - 104 Hz. The anelasticity spectra reveal in the temperature range 470-870 K both structural and anelastic relaxation processes. Two structural damping maxima connected with inverse temperature trend of the modulus occur in the alloys submitted to equal channel angular pressing, the first one is strongly suppresed by Sc and Zr addition. An anelastic relaxation peak whose strength depends on the nature and morphology of precipitates and dispersoids and on the deformation and ageing condition was observed in all samples investigated. The high background damping occurring before the first structural damping maximum is analyzed with reference to a superplastic behavior of the equal channel angular pressing processed alloys.

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“…2(b), one can find that the peak temperatures of P 1 and P 2 peaks shift to higher temperatures and exhibit a thermal-activated relaxation characteristic [30]. Thus, the relaxation time and activation energy of P 1 and P 2 peaks should follow the Arrenius equation [31]:…”

Section: Resultsmentioning

confidence: 99%

Low-frequency damping properties of as-extruded Mg–11.2Li–0.95Al–0.43Zn magnesium alloy

Chang

Tsia

et al. 2011

Materials Science and Engineering: A

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Low frequency internal friction associated with precipitation in AlMgSi alloys

Cited by 14 publications

References 13 publications

Microstructural Characteristics and Vibration Fracture Properties of Al-Mg-Si Alloys with Excess Cu and Ni

Microstructural Characteristics and Vibration Fracture Properties of Al-Mg-Si Alloys with Excess Cu and Ni

Anelasticity and Structural Stability of ECAP Processed Al-Mg-Si Alloys Investigated by Mechanical Spectroscopy

Low-frequency damping properties of as-extruded Mg–11.2Li–0.95Al–0.43Zn magnesium alloy

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