Effect of ECAP temperature on microstructure and mechanical properties of Al–Zn–Mg–Cu alloy

Shaeri, M.H.; Ebrahimi, Mahmoud; Salehi, Mohammad Taghi; Seyyedein, S. H.

doi:10.1016/j.pnsc.2016.03.003

Cited by 163 publications

(46 citation statements)

References 57 publications

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“…Unfortunately, despite numerous studies [11][12][13][14][15] dealing with the examination of extensive grain refinement through ECAP on mechanical properties of these precipitation-hardened aluminum alloys, the effect of a UFG microstructure on precipitation sequence under post-deformation aging is relatively poorly known [5,9,[16][17][18]. It was shown that the formation of a UFG microstructure changes the post-deformation aging is relatively poorly known [5,9,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Mogucheva

Kaibyshev

2016

Metals

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Abstract:The effect of post-deformation solution treatment followed by water quenching and artificial aging on microstructure and mechanical properties of an Al-Li-Mg-Sc-Zr alloy subjected to equal-channel angular pressing (ECAP) was examined. It was shown that the deformed microstructure produced by ECAP remains essentially unchanged under solution treatment. However, extensive grain refinement owing to ECAP processing significantly affects the precipitation sequence during aging. In the aluminum-lithium alloy with ultrafine-grained (UFG) microstructure, the coarse particles of the S 1 -phase (Al 2 LiMg) precipitate on high-angle boundaries; no formation of nanoscale coherent dispersoids of the δ -phase (Al 3 Li) occurs within grain interiors. Increasing the number of high-angle boundaries leads to an increasing portion of the S 1 -phase. As a result, no significant increase in strength occurs despite extensive grain refinement by ECAP.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Mogucheva

Kaibyshev

2016

Metals

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“…In this investigation, the following two main strengthening mechanisms were considered: (a) grain refinement (b) work hardening due to increase of dislocation density. The fragmented precipitates were too small to be resolved in TEM images, which lead to uncertainty in strength calculation from where, 0 is the lattice friction stress against the movement of dislocations and its value is ∼ 20 MPa for Al [25,32], the Hall-Petch coefficient (k) is a structure sensitive constant that represents the contribution of the grain boundaries to the related strengthening and is approximately equal to 0.12 MPa √ m , where d is the average grain size. The average grain sizes after the first and second ECAP passes were 2.6 µm and 650 nm.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…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 main aim of this paper is to investigate the effect of a particular processing route (B C ) of ECAP, deformed at room temperature, on mechanical properties and crystallographic texture for EN AW 7075 alloy in annealed condition. Route B C , which is 90° clockwise rotations of the billet around its longitudinal axis after each repeated pass, has already been proven to produce a homogeneous equi-axed grain structure with a large fraction of high angle grain boundaries and has been evidently established by Valiev et al [31] and Shaeri et al [32,33]. Since the production of a UFG for EN AW7075 alloy with superior mechanical properties is strongly dependent on the crystal orientation, effort has been made to examine the macro-texture of the deformed material by bulk XRD technique and subsequently correlate microstructure and mechanical properties for greater scientific perspective.…”

Section: Introductionmentioning

confidence: 97%

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Development of ultrafine grained Al–Zn–Mg–Cu alloy by equal channel angular pressing: microstructure, texture and mechanical properties

Ghosh

Gudimetla

et al. 2020

Archiv.Civ.Mech.Eng

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In this article, an effort has been made to investigate the evolution of microstructure, texture and mechanical properties of AA 7075 alloy during equal channel angular pressing (ECAP) by route B C at room temperature at a pressing speed of 1 mm/ min. Transmission electron microscopy (TEM) revealed the presence of rod-like (MgZn 2 ) precipitates in annealed conditions which were broken after two ECAP passes along with remarkable grain refinement due to high imposed strain after the second pass. After two consecutive ECAP passes, hardness, yield strength, and tensile strength of the alloy increased significantly in comparison to initial annealed condition. The fraction of high angle boundaries (HABs) and grain misorientation angle significantly increased after ECAP passes compared to the initial condition. Texture measurements were performed by X-ray diffractometer (XRD), on TD plane (parallel to extrusion direction). Texture results revealed the dominance of C and A * 2 components after the first pass and the presence of strong B , B and Ā components along with weaker A * 2 , C components after the second pass. Scanning electron microscopy (SEM) revealed that the average dimple size was gradually reduced with increasing the ECAP passes.

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“…On the other hand, temperature is effective to cause decreasing on high angle boundaries and transformation on metal phase. The die was heated up until 15 minutes to desire temperature furnace [16]. Higher temperatures of 200°C, 250°C, 450°C result in decreasing the size of grains and the microstructure during continues ECAP process [18].…”

Section: Pressing Temperaturementioning

confidence: 99%

Solid-State Recycling of Light Metal Reinforced Inclusions by Equal Channel Angular Pressing: A Review

2017

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Abstract. Solid-state recycling of light metals reinforced inclusions through hot Equal Channel Angular Pressing (ECAP) is performed to directly recycle metal scraps and reduce cost of material in engineering applications. The ECAP is one of the most important method in severe plastic deformation (SPD) that can convert light metals into finished products. This paper reviews several experimental and numerical works that have been done to investigate the effects of the ECAP parameters such as die angles, material properties, outer corner angle, friction coefficient, temperature, size of chips, pressing force, ram speed and direct effects of number of passes on the strain distributions. It also includes the performance enhancement of aluminium matrix composite reinforced ceramic-based particles that derived from direct recycled aluminium chips for sustainable manufacturing practices.

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Effect of ECAP temperature on microstructure and mechanical properties of Al–Zn–Mg–Cu alloy

Cited by 163 publications

References 57 publications

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Development of ultrafine grained Al–Zn–Mg–Cu alloy by equal channel angular pressing: microstructure, texture and mechanical properties

Solid-State Recycling of Light Metal Reinforced Inclusions by Equal Channel Angular Pressing: A Review

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