The plastic deformation of polycrystals I. Aluminium between room temperature and 400°C

Al-Haidary, J. T.; Petch, N. J.; Rios, E. R. de los

doi:10.1080/01418618308243126

Cited by 60 publications

(18 citation statements)

References 25 publications

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“…From eq. (7) we obtain as a lower limit of the dislocation density the value N d ¼ 3 Â 10 13 m --2 , which is comparable to the value obtained by TEM investigations of a specimen 15% deformed at room temperature (Al-Haidary et al [19]). …”

Section: Work-hardeningsupporting

confidence: 70%

“…The dislocation density was found to increase with strain, with a density of about 3 Â 10 14 m --2 after 20% deformation [17]. In addition, it was observed that a great deal of recovery and dislocation annihilation occur during the deformation [19]. Our specimens exhibit the typical parabolic work-hardening curves of fcc polycrystals.…”

Section: Work-hardeningmentioning

confidence: 72%

“…The deformation behaviour and dislocation densities of polycrystalline aluminum sam- Thompson et al. [17], Hansen [18], Al-Haidary et al [19] and Young et al [20]. A cellular network of dislocations was found to develop during deformation.…”

Section: Work-hardeningmentioning

confidence: 99%

“…Due to the high purity and the large grain sizes of the specimens used, the absolute values of the work-hardening level are considerable smaller than in the case of typical polycrystalline material with fine grain sizes (Thompson et al [17]), but are comparable to that of "multicrystalline" specimens (Hansen [18]). Usually, in polycrystalline metals the flow stress s depends on both the dislocation density N d and the grain size d g (see, for example, Al-Haidary et al [19]). However, for grain sizes larger than 1 mm -as it is the case for our specimens -the influence of the grain size on the flow stress s is less than 5% [19] and the flow stress s is descibed by…”

Section: Work-hardeningmentioning

confidence: 99%

“…Usually, in polycrystalline metals the flow stress s depends on both the dislocation density N d and the grain size d g (see, for example, Al-Haidary et al [19]). However, for grain sizes larger than 1 mm -as it is the case for our specimens -the influence of the grain size on the flow stress s is less than 5% [19] and the flow stress s is descibed by…”

Section: Work-hardeningmentioning

confidence: 99%

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Low-Temperature Acoustic and Thermal Properties of Plastically Deformed, High-Purity Polycrystalline Aluminum

Wasserbäch¹,

Abens

Sahling

et al. 2001

phys. stat. sol. (b)

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The low-temperature internal friction Q --1 , thermal conductivity j, specific heat c p and heat release of plastically deformed, high-purity aluminum polycrystals have been investigated and have been compared with measurements on an amorphous SiO 2 specimen. Plastic deformation has a pronounced effect on both internal friction Q --1 and thermal conductivity j in the superconducting state. The magnitude of the internal friction Q --1 can be increased over two orders by plastic deformation over that observed on an annealed sample, and approaches a value approximately equal to that of the amorphous SiO 2 specimen. The lattice thermal conductivity j of the deformed specimens also has a magnitude which is of the same order as that of amorphous SiO 2 , it is, however, nearly independent of the amount of deformation. No "glass-like" anomalies could be observed in the specific heat c p and heat release measurements. The specific heat c p approaches a T 3 -relationship at the lowest temperatures investigated, and heat release experiments clearly show no longtime energy relaxation effects. Thus, it must be concluded that the defects introduced into deformed aluminum cannot be described with the tunneling model which had been proposed to describe the low temperature elastic and thermal properties of amorphous solids and which is based on the assumption of a constant spectral density of tunneling states. The phonon scattering mechanism observed in the deformed aluminum is tentatively related to the interaction of phonons with geometrical kinks in dislocations.

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Section: Work-hardeningsupporting

confidence: 70%

Section: Work-hardeningmentioning

confidence: 72%

Section: Work-hardeningmentioning

confidence: 99%

Section: Work-hardeningmentioning

confidence: 99%

Section: Work-hardeningmentioning

confidence: 99%

See 3 more Smart Citations

Low-Temperature Acoustic and Thermal Properties of Plastically Deformed, High-Purity Polycrystalline Aluminum

Wasserbäch¹,

Abens

Sahling

et al. 2001

phys. stat. sol. (b)

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Effect of Grain Size on Tensile Stress and Ductility in Al99.99

Kovács-Csetényi¹,

Horváth²,

Chinh

et al. 1998

phys. stat. sol. (a)

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The effect of recrystallized grain size on the tensile stress and ductility of 99.99% purity aluminium was investigated at room temperature. It was proved that the grain size dependence of flow stress follows a modified Hall‐Petch equation with coefficients depending linearly on ε1/2 up to the stabil‐ity limit. The uniform strain can also be described by a linear dependence on d—1/2 according to which the uniform elongation increases with increasing grain size. The post‐uniform elongation changes inversely to that of the uniform one accompanied by the decrease of the strain rate sensitivity.

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Using of Modified Trapping Model in Positron-Lifetime Study of Cold-Worked Aluminium

Prochzka

Kmje

et al. 2000

phys. stat. sol. (a)

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Positron-lifetime (PL) and electrical resistivity studies of polycrystalline aluminium deformed by tensile stress at T 77 K were performed. It was found that the conventional trapping model (CTM) fails in interpretation of measured PL spectra due to strongly non-uniform spatial distribution of dislocations in the deformed samples. Therefore, a modified trapping model (MTM) was used in this study. Strongly non-uniform dislocation density was directly taken into account in the development of MTM. Comparison of the results obtained by MTM and CTM is given in the present work. Mean cell size in the deformed samples obtained from MTM analyses of PL spectra are compared with those measured by TEM. 440 J. C Ï i Âz Ïek et al. J. C Ï i Âz Ïek et al.

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The plastic deformation of polycrystals I. Aluminium between room temperature and 400°C

Cited by 60 publications

References 25 publications

Low-Temperature Acoustic and Thermal Properties of Plastically Deformed, High-Purity Polycrystalline Aluminum

Low-Temperature Acoustic and Thermal Properties of Plastically Deformed, High-Purity Polycrystalline Aluminum

Effect of Grain Size on Tensile Stress and Ductility in Al99.99

Using of Modified Trapping Model in Positron-Lifetime Study of Cold-Worked Aluminium

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