Microstructure and mechanical properties of friction stir welded joints made from ultrafine grained aluminium 1050

Lipińska, Marta; Olejnik, Lech; Pietras, A.; Rosochowski, Andrzej; Bazarnik, Piotr; Goliński, J.; Brynk, Tomasz; Lewandowska, M.

doi:10.1016/j.matdes.2015.08.129

Cited by 49 publications

(25 citation statements)

References 35 publications

(50 reference statements)

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“…On the other hand, when a relatively high level of tool tilt angle (5 • ) was applied, the un-bonded overlapped interface was forced toward the nipple region (indicated by the arrow in Fig. 5d).…”

Section: Resultsmentioning

confidence: 99%

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The Influence of Tool Tilt Angle on 1050 Aluminum Lap Joint in Friction Stir Welding Process

Barlas

2017

Acta Phys. Pol. A

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In this paper, the effect of tool tilt angle on tensile-shear failure load and weld zone properties for 1050 aluminum plates, welded by friction stir lap welding, were investigated. For this purpose, tool tilt angle was varied from 0• to 5• under the constant other parameters, such as tool geometry, tool rotation speed of 1200 rpm and tool travel speed of 30 mm/min. The tensile-shear test was employed to test the mechanical properties of the joint. Optical microscope examinations, microhardness and temperature measurements were also performed in weld zone of lap joints. According to overall results, the tool tilt angle has a reasonable influence on the joint soundness and weld defect formation. If the tool axis was perpendicular to plate surface or a larger tool tilt angle was used, such configurations had harmful effect for the weld zone. In such case the tensile-shear failure load dropped from 4853 N to 2799 N. Recorded peak temperatures varied from 381• C to 438• C in the weld center. The measured mean hardness values of the stir and heat-affected zones were 31.5 HV and 28.3 HV, respectively, which are lower than that of aluminum 1050 base metal (40.7 HV).

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Section: Resultsmentioning

confidence: 99%

“…Many researchers have studied joining of 1XXX series aluminum and have found that FSW parameters have key roles in obtaining a sufficient joint performance and microstructural evolution [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Tool Tilt Angle on 1050 Aluminum Lap Joint in Friction Stir Welding Process

Barlas

2017

Acta Phys. Pol. A

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“…[44] In addition, rapid necking is observed for samples with the UFG structure, which is typical for materials after the SPD processing, and has been achieved for pure aluminum. [21,45] The flow stress quickly achieves the maximum value and then decreases gradually. It indicates that necking occurs early and further deformation is accompanied by a deepening neck.…”

Section: B Mechanical Propertiesmentioning

confidence: 98%

Ultrafine-Grained Plates of Al-Mg-Si Alloy Obtained by Incremental Equal Channel Angular Pressing: Microstructure and Mechanical Properties

Lipińska

Chromiński

Olejnik

et al. 2017

Metall Mater Trans A

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In this study, an Al-Mg-Si alloy was processed using via incremental equal channel angular pressing (I-ECAP) in order to obtain homogenous, ultrafine-grained plates with low anisotropy of the mechanical properties. This was the first attempt to process an Al-Mg-Si alloy using this technique. Samples in the form of 3 mm-thick square plates were subjected to I-ECAP with the 90 deg rotation around the axis normal to the surface of the plate between passes. Samples were investigated first in their initial state, then after a single pass of I-ECAP, and finally after four such passes. Analyses of the microstructure and mechanical properties demonstrated that the I-ECAP method can be successfully applied in Al-Mg-Si alloys. The average grain size decreased from 15 to 19 lm in the initial state to below 1 lm after four I-ECAP passes. The fraction of high-angle grain boundaries in the sample subjected to four I-ECAP passes lay within 53 to 57 pct depending on the examined plane. The mechanism of grain refinement in Al-Mg-Si alloy was found to be distinctly different from that in pure aluminum with the grain rotation being more prominent than the grain subdivision, which was attributed to lower stacking fault energy and the reduced mobility of dislocations in the alloy. The ultimate tensile strength increased more than twice, whereas the yield strength was more than threefold. Additionally, the plates processed by I-ECAP exhibited low anisotropy of mechanical properties (in plane and across the thickness) in comparison to other SPD processing methods, which makes them attractive for further processing and applications.

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“…This is especially common for materials, such as aluminum, which is characterized by high stacking fault energy. In our previous work, we have demonstrated that despite the deterioration of mechanical properties and grain growth in joints compared to hardened base material, good quality butt joints were produced using FSW for UFG aluminum plates. Moreover, the obtained results are promising in comparison to other methods of joining aluminum.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Behavior of the Friction Stir Welded Joints Made from Ultrafine Grained Aluminum

et al. 2017

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This version is available at https://strathprints.strath.ac.uk/60605/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. is currently known as one of the most developed.[2] The material deformation is performed by a 24 simple shear [3] , while a sample is pressed through two intersecting channels with the same cross-25 sections.[4] 26 3 ECAP was also a subject of a number of modifications to improve its effectiveness and possibility 1 to process hard-to-deform materials, e.g. additional back pressure [5] , rotary die [6] , matrix with two 2 parallel channels [7] or with two converging billets [8] to mention only a few of such modifications. 3Recently, Incremental ECAP (I-ECAP) [9] has been developed and proved as an efficient method of 4 producing UFG metals in the form of plates [10] or bars. [11] In particular, the plate shape seems to be 5 very promising in the case of further applications. fragmentation during plastic deformation may result in improved corrosion properties due to the 9 reduction of the cathodic surface.[17] 10In this study, the correlation between microstructure changes in base materials (due to SPD 11 processing) and stir zones (due to FSW processing) and their electrochemical response will be 12 discussed with the main emphasis on the influence of grains, grain boundaries and particles. Experimental 14The investigated material was commercially pure aluminium (99.50 wt.%). According to EN AW- for materials with different number of I-ECAP passes, which comes from their structural 1 differences and which will not be the subject of the present study. The exact values were as follows: 13The samples in the form of thin foils were used. They were prepared using a wire saw, ground down also determined. SEM observations were also used in order to characterize the particles observed in 1 the microstructure. Samples were prepared the same way as for EBSD investigation. 2Before each electrochemical test, the sa...

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Microstructure and mechanical properties of friction stir welded joints made from ultrafine grained aluminium 1050

Cited by 49 publications

References 35 publications

The Influence of Tool Tilt Angle on 1050 Aluminum Lap Joint in Friction Stir Welding Process

The Influence of Tool Tilt Angle on 1050 Aluminum Lap Joint in Friction Stir Welding Process

Ultrafine-Grained Plates of Al-Mg-Si Alloy Obtained by Incremental Equal Channel Angular Pressing: Microstructure and Mechanical Properties

Microstructure and Corrosion Behavior of the Friction Stir Welded Joints Made from Ultrafine Grained Aluminum

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