The relationship of time-dependent hardness and scratch hardness

Gerk, A. P.

doi:10.1088/0022-3727/9/15/003

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1981

2009

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Cited by 5 publications

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“…It approximatelyfits a broadened peak as well. For this activation enthalpy H the authors found: 1.1 [20], 1.1 [28], 0.7 to 1.1 eV decreasing with increasing deformation [lg], (1.06 0.1) eV [21, 221. The agreement with the a-relaxation is quite good.…”

Section: Compavison With Data Of Other Atcthorsmentioning

confidence: 99%

Internal friction due to kink motion and kink pair formation in intrinsic and n-doped germanium

Jendrich

Haasen

1988

Phys. Stat. Sol. (a)

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Measurements of the internal friction on deformed Ge at frequences from 0.2 to 20 Hz at temperatures between 150 and 820 K show two maxima α and β, occuring after deformation only. Their activation enthalpy H, prefactor f0, and relaxation strength Δ are: Hα = (1.108 ± 0.01) eV, f0α = (0.14 to 15) × 109 s−1 (increasing with increasing deformation), Δα ≈︁ 10−2; Hβ = (2.07 ± 0.2) eV, f0β ≈︁ 1013 s−1, Δβ ≈︁ 3 × 10−2). Both shift to lower temperatures with increasing deformation. They are attributed to the movement of geometrical kinks (α) and to kink pair formation (β) on single partial dislocations. Doping with (2 to 4) × 1017 cm−3 Sb lowers the kink migration enthalpy Hα by 0.3 to 0.4 eV. This indicates that the lowering of the activation enthalpy of the dislocation velocity by doping is due to that of the kink migration enthalpy Hα only.

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Section: Compavison With Data Of Other Atcthorsmentioning

confidence: 99%