Mechanical properties and microstructural evolution during multi-pass ECAR of Al 1100–O alloy

Azimi, Amin; Tutunchilar, S.; Faraji, Ghader; Givi, Mohammad Kazem Besharati

doi:10.1016/j.matdes.2012.06.035

Cited by 48 publications

(18 citation statements)

References 60 publications

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“…In order to verify whether the grain boundary strengthening predicted by the Hall-Petch relationship remains consistent for the UFG Al-3Mg-0.2Sc alloy, Fig. 9 plots the yield stress,  y , against the inverse square root of the grain size using both the experimental data obtained in this investigation and data from other studies conducted on commercially pure aluminium [86][87][88][89], Al-Mg alloys [10,18,20,51,[90][91][92] and Al-Mg-Sc alloys [37,[42][43][44]93].…”

Section: Examining the Validity Of The Hall-petch Relationship In Al-mentioning

confidence: 99%

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractExperiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 m and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10 -4 to ~10 3 s -1 .The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarsegrained material to superplasticity in the UFG alloy.

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Section: Examining the Validity Of The Hall-petch Relationship In Al-mentioning

confidence: 99%

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

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“…The properties of the products in SPD methods are very critical to achieve a working sample in industrial application 125) (c) KOBO, 136) and (d) ECAR. 102) to provide the required functions. The properties are specified by the microstructure evolution during the SPD process.…”

Section: Microstructure and Propertiesmentioning

confidence: 99%

An Overview on the Continuous Severe Plastic Deformation Methods

Faraji

Torabzadeh

2019

Mater. Trans.

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Severe Plastic Deformation (SPD) processes have been extensively investigated in the last 30 years to facilitate the production processes of nanostructured (NS) or ultrafine-grained (UFG) materials with unique properties. However, the majority of the efforts were limited on the laboratory-scale investigations not to be able to overcome the demands for industrial scale applications. Researchers have tried to introduce effective industrial methods for processing large and long UFG/NG materials. In this review, all industrial processes especially continuous SPD methods which are more suitable for mass production are categorized and explained. Furthermore, the factors influencing the process efficiency were presented to give a vision to the researchers who want to step in this scientific field. Finally, the industrial processes were compared regarding final microstructure and properties.

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“…Furthermore, the EBSD orientation color map reveals that the magnitude of the average grain size is about 480 nm after four passes of the ECFE process, as is represented in Figure 8. Although the calculated XRD method gives the cell or sub-grain size, and the EBSD analysis expresses the average grain size [34], it seems that the results of the EBSD image are more accurate than the theoretical approach because the XRD procedure could be affected by the strain, stress, and energy density and also other relevant parameters influencing the measurement. It is clearly observed that the fraction number of LAGBs is minor and the HAGBs are the major fraction, i.e., the large angle grain boundaries occupy about 87% of the microstructure.…”

Section: Microstructural Characteristicsmentioning

confidence: 99%

Experimental Investigation of the Equal Channel Forward Extrusion Process

Ebrahimi

Djavanroodi

Tiji

et al. 2015

Metals

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Among all recognized severe plastic deformation techniques, a new method, called the equal channel forward extrusion process, has been experimentally studied. It has been shown that this method has similar characteristics to other severe plastic deformation methods, and the potential of this new method was examined on the mechanical properties of commercial pure aluminum. The results indicate that approximate 121%, 56%, and 84% enhancements, at the yield strength, ultimate tensile strength, and Vickers micro-hardness measurement are, respectively, achieved after the fourth pass, in comparison with the annealed condition. The results of drop weight impact test showed that the increment of 26% at the impact force, and also decreases of 32%, 15%, and 4% at the deflection, impulse, and absorbed energy, are respectively attained for the fourth pass when compared to the annealed condition. Furthermore, the electron backscatter diffraction examination revealed that the average grain size of the final pass is about 480 nm.

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Mechanical properties and microstructural evolution during multi-pass ECAR of Al 1100–O alloy

Cited by 48 publications

References 60 publications

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

An Overview on the Continuous Severe Plastic Deformation Methods

Experimental Investigation of the Equal Channel Forward Extrusion Process

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