The application of equal-channel angular pressing to an aluminum single crystal

Fukuda, Y.; Oh-ishi, Keiichiro; Furukawa, Mutsuhisa; Horita, Zenji; Langdon, Terence G.

doi:10.1016/j.actamat.2003.11.028

Cited by 106 publications

(62 citation statements)

References 29 publications

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“…Within these cells, there are many subgrains oriented approximately parallel to each other. This inhomogeneous microstructure is similar to earlier results reported for Al single crystals [16] and high purity (99.99%) aluminum [17] processed by ECAP for 1 pass. A regular array of grains is achieved after 4 passes with an average size of~1.4 lm as shown in Figure 3d and it is apparent that there is both a significant increase in the numbers of grain boundaries having high-angles of misorientation and a greater variation in the colors within the unit triangle between adjacent grains.…”

Section: Microhardness Measurements After Ecapsupporting

confidence: 79%

Micro-deformation behavior in micro-compression with high-purity aluminum processed by ECAP

Wang

Shan

et al. 2015

Manufacturing Rev.

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-Ultrafine-grained (UFG) materials have a potential for applications in micro-forming since grain size appears to be the dominant factor which determines the limiting size of the geometrical features. In this research, high-purity Al was processed by equal-channel angular pressing (ECAP) at room temperature through 1-8 passes. Analysis shows that processing by ECAP produces a UFG structure with a grain size of~1.3 lm and with microhardness and microstructural homogeneity. Micro-compression testing was carried out with different specimen dimensions using the annealed sample and after ECAP processing through 1-8 passes. The results show the flow stress increases significantly after ECAP processing by comparison with the annealed material. The flow stress generally reaches a maximum value after 2 passes which is consistent with the results of microhardness. The flow stress decreases with decreasing specimen diameter from 4 mm to 1 mm which demonstrates that size effects also exist in the ultrafine-grained materials. However, the deformation mechanism in ultrafine-grained pure Al changes from strain strengthening to softening by dynamic recovery by comparison with the annealed material.

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Section: Microhardness Measurements After Ecapsupporting

confidence: 79%

Micro-deformation behavior in micro-compression with high-purity aluminum processed by ECAP

Wang

Shan

et al. 2015

Manufacturing Rev.

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“…It indicates that the geometrical shape of the ECAP die decides the value of shear angle, S . For an ECAP die with ¼ 90 and ¼ 0 , the shear angle S is 26.6 , which is consistent with many experimental results [10][11][12]. Hereafter, the shear plane along the flow line direction is named as the ECAP shear plane, which differs from the general shear deformation plane [5].…”

Section: Introductionsupporting

confidence: 71%

Anisotropic compressive properties of iron subjected to single-pass equal-channel angular pressing

Han

Zhang

Sheng

et al. 2006

Philosophical Magazine Letters

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The anisotropic compressive properties and shear deformation mechanism of iron subjected to equal-channel angular pressing (ECAP) with single-pass have been investigated. It was found that the anisotropic compressive properties can be attributed to the effect of the ECAP shear plane. It is suggested that the ECAP shear plane induced by the first pass of ECAP is a relatively weak plane in terms of resisting subsequent shear deformation.

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“…The process of grain refinement has been tracked in pure Al using both single crystals [34][35][36] and polycrystalline materials [37][38][39][40][41][42] and these observations provide information which may be used to construct a model for the development of an ultrafine-grained structure.…”

Section: The Principles Of Grain Refinement In Spd Processingmentioning

confidence: 99%

Using Severe Plastic Deformation for the Processing of Advanced Engineering Materials

Figueiredo

Langdon

2009

Mater. Trans.

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The processing of metals through the application of severe plastic deformation leads to significant grain refinement and provides an opportunity for achieving superior properties. The two procedures of equal-channel angular pressing (ECAP) and high-pressure torsion (HPT) are examined with emphasis on the mechanical properties at low and high temperatures and the nature of the grain refinement. It is demonstrated that grain refinement occurs relatively homogeneously in f.c.c metals through the formation of dislocation cells or subgrains and the evolution of these cells into an array of ultrafine grains separated by high angle boundaries. By contrast, grain refinement in h.c.p. metals such as magnesium is inhomogeneous and occurs through the nucleation of new grains along the initial grain boundaries due to the high stresses generated to activate multiple slip systems. Ultrafine-grained metals generally exhibit high strength but they may exhibit weakening if the processing conditions adversely affect the precipitate morphology. If the ultrafine grains are stable at high temperatures there is a possibility of achieving excellent superplastic properties.

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The application of equal-channel angular pressing to an aluminum single crystal

Cited by 106 publications

References 29 publications

Micro-deformation behavior in micro-compression with high-purity aluminum processed by ECAP

Micro-deformation behavior in micro-compression with high-purity aluminum processed by ECAP

Anisotropic compressive properties of iron subjected to single-pass equal-channel angular pressing

Using Severe Plastic Deformation for the Processing of Advanced Engineering Materials

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