2012
DOI: 10.1590/s1516-14392012005000105
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Abstract: High strength AA7050 aluminum alloy was processed by ECAP through route A in the T7451 condition. Samples were processed at 423 K, with 1 and 3 passes. The resulting microstructure was evaluated by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phases were identified by X-ray diffraction (XRD) using monochromatic Cu Kα radiation. Rockwell B hardness and tensile tests were performed for assessment of mechanical properties. The microstructure was refin… Show more

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Cited by 4 publications
(5 citation statements)
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“…where is a shape factor normally ~ 0.3, M is the average Taylor factor assuming its value as 3.06 for a random textured material, G is the shear modulus and its value can be taken as 26 GPa, b is the length of burgers vector of dislocations, which is equal to 0.286 nm for octahedral slip in pure Al [25], is the dislocation density. The value of after first and second ECAP pass was taken as 3.98 × 14 14 , 4.8 × 14 14 (m −2 ), respectively, for 7075 alloy at room temperature [32]. Therefore, the estimation of total strength ( total ) can be written as follows: Applying the values for average grain size and dislocation density in Eq.…”
Section: Mechanical Propertiesmentioning
confidence: 99%
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“…where is a shape factor normally ~ 0.3, M is the average Taylor factor assuming its value as 3.06 for a random textured material, G is the shear modulus and its value can be taken as 26 GPa, b is the length of burgers vector of dislocations, which is equal to 0.286 nm for octahedral slip in pure Al [25], is the dislocation density. The value of after first and second ECAP pass was taken as 3.98 × 14 14 , 4.8 × 14 14 (m −2 ), respectively, for 7075 alloy at room temperature [32]. Therefore, the estimation of total strength ( total ) can be written as follows: Applying the values for average grain size and dislocation density in Eq.…”
Section: Mechanical Propertiesmentioning
confidence: 99%
“…The reasons for ECAP being 7 Page 2 of 17 the most efficient process among the all SPD processes have been unanimously put forward by many researchers [10][11][12][13][14]. Pirgazi et al [10] compared ARB with ECAP for EN AW 1100 alloy, Nagasekhar et al [11] analysed the results with the help of Finite Element Measurement (FEM), Cepeda [12], Kumar [13] and Cardoso et al [14] unveiled the mechanisms of grain refinement, in association with development of high dislocation density as being the prevailing driving force during ECAP to attain high strength in materials. A detailed description about the ECAP process has been discussed by Li [15] and Djavanroodi et al [16] for face-centred cubic (FCC) and body-centred cubic (BCC) materials.…”
Section: Introductionmentioning
confidence: 99%
“…In accordance with the upper bound theory the minimum of p/2k corresponds to the best approximation of real working pressure by upper bound one. The values of x, at which the minimum is achieved, were found from the well known extremum condition d(p/2k)/dx = 0 and Equation 3. These values can be determined by the Formula 4…”
Section: Upper Bound Analysismentioning
confidence: 99%
“…Therefore the estimation of resulting plastic shear during ECAE is a matter of special importance. The total ECAE shear γ S is the sum of the shears on the lines of discontinuities of velocity l 1-2 and l [2][3] (Figure 2a), i.e. …”
Section: Upper Bound Analysismentioning
confidence: 99%
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