Low-frequency internal friction studies of nanocrystalline copper

Weins, W. N.; Makinson, J. D.; Angelis, R.J. De; Axtell, S. C.

doi:10.1016/s0965-9773(97)00112-8

Cited by 19 publications

(5 citation statements)

References 4 publications

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“…Some interesting phenomena have recently been observed for the GB internal friction in nanostructured materials [13][14][15][16][17][18][19][20]. The internal friction measured in nanocrystalline Pd below 300 K was reported to be much weaker than in well-annealed coarse-grained Pd, and some of the internal friction peaks of nanocrystalline Pd were found being annealed out in a second run after heating to 640 K [13].…”

Section: Introductionmentioning

confidence: 96%

Microstructure and grain boundary relaxation in ultrafine-grained Al/Al oxide composites

Yang

Chen

et al. 2009

Acta Materialia

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Section: Introductionmentioning

confidence: 96%

Microstructure and grain boundary relaxation in ultrafine-grained Al/Al oxide composites

Yang

Chen

et al. 2009

Acta Materialia

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“…[10][11][12] A steep increase in the internal friction, Q À1 , of n-metals is observed at the temperature slightly higher than 300 K, where the activation energy estimated is also close to that reported for the GB diffusion in p-metals. [13][14][15][16][17][18][19][20] These results indicate that intrinsic natures of the GB regions in n-metals appear to be similar to those in p-metals.…”

Section: Introductionmentioning

confidence: 97%

Anelasticity Study on Motions of Atoms in the Grain Boundary Regions in Nanocrystalline Gold

2003

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High-density nanocrystalline (n-) Au was prepared by the gas deposition method. Various anelastic and plastic creep processes associated with the grain boundary (GB) regions were observed. The vibrating reed measurements at 10 2 Hz with strain amplitude of 10 À6 show a very broad internal friction peak near 95 K, Q À1 p,95 K , and a steep increase in the anelastic strain above 200 K, " a-I,>200 K . The tensile tests show a steep increase in the anelastic strain above 200 K, " a-II,>200 K , for the stress beyond a few MPa and a linear plastic creep strain above 200 K, " pc-1 , for stress range between 30 MPa and 150 MPa. The activation parameters, 1= 0 of 3 Â 10 11 s À1 and E of 0.16 eV, are found for Q À1 p,95 K , where 0 and E are a pre-exponential factor and an activation energy of the relaxation time . We surmise that simple relaxation processes are responsible for Q À1 p,95 K . The values of 1= 0 and E found for " a-I,>200 K and " a-II,>200 K decrease with increasing the applied stress or the temperature, indicating that their atomic processes are the same feather. Further, E found for " pc-1 is similar to or slightly smaller than that of " a-II,>200 K . These observations indicate that the atomic motions in the GB regions of n-Au develop in scale in the order of the underlying processes for " a-I,>200 K , " a-II,>200 K and " pc-1 , and are so different from those in the conventional polycrystalline Au.

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“…There have been a few investigations on the internal friction of nanocrystalline (hereafter n-) materials, such as n-Pd [5], n-Al [6], n-Cu [7], n-Au [8] and n-Ni [9]. In general, a damping peak superimposed on a background increasing with temperature was observed.…”

Section: Introductionmentioning

confidence: 99%

Internal Friction of Nanocrystalline Silver

Wang¹,

Cui²,

Wu³

et al. 2001

phys. stat. sol. (a)

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Low frequency internal friction and shear modulus of nanocrystalline silver were measured by both force vibration and free decay methods. The specimens were prepared by inert gas condensation and in situ warm compaction. The average grain size of the specimens was 52 nm. An internal friction peak was observed around 450 K. The activation energy of the peak was measured to be 0.88 (AE0.1) eV, in agreement with that of grain boundary diffusion in silver. The internal friction peak is suggested to be associated with grain boundary relaxation.

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Low-frequency internal friction studies of nanocrystalline copper

Cited by 19 publications

References 4 publications

Microstructure and grain boundary relaxation in ultrafine-grained Al/Al oxide composites

Microstructure and grain boundary relaxation in ultrafine-grained Al/Al oxide composites

Anelasticity Study on Motions of Atoms in the Grain Boundary Regions in Nanocrystalline Gold

Internal Friction of Nanocrystalline Silver

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