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Research Papers: Friction and Wear

High-Temperature Wear Mechanisms of a Severely Plastic Deformed Al/Mg2Si Composite

[+] Author and Article Information
Mahsa Ebrahimi

The Complex Laboratory of Hot Deformation
and Thermomechanical Processing of High
Performance Engineering Materials,
School of Metallurgy and Materials Engineering,
College of Engineering,
University of Tehran,
P.O. Box 14395-551,
Tehran, Iran
e-mail: Mahsa.ebrahimi@ut.ac.ir

Abbas Zarei-Hanzaki

The Complex Laboratory of Hot Deformation
and Thermomechanical Processing of High
Performance Engineering Materials,
School of Metallurgy and Materials Engineering,
College of Engineering,
University of Tehran,
P.O. Box 14395-551,
Tehran, Iran
e-mail: zareih@ut.ac.ir

A. H. Shafieizad

The Complex Laboratory of Hot Deformation and
Thermomechanical Processing of High
Performance Engineering Materials,
School of Metallurgy and Materials Engineering,
College of Engineering,
University of Tehran,
P.O. Box 14395-551,
Tehran, Iran
e-mail: a.shafieizad@ut.ac.ir

Michaela Šlapáková

Department of Physics of Materials,
Faculty of Mathematics and Physics,
Charles University,
Ke Karlovu 5,
Prague 2 121 16, Czech Republic
e-mail: slapakova@karlov.mff.cuni.cz

Parya Teymoory

The Complex Laboratory of Hot Deformation and
Thermomechanical Processing of High
Performance Engineering Materials,
School of Metallurgy and Materials Engineering,
College of Engineering,
University of Tehran,
P.O. Box 14395-551,
Tehran, Iran
e-mail: parya_teymoory@ut.ac.ir

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 22, 2018; final manuscript received October 4, 2018; published online November 21, 2018. Assoc. Editor: Xiaolei Wang.

J. Tribol 141(3), 031604 (Nov 21, 2018) (14 pages) Paper No: TRIB-18-1228; doi: 10.1115/1.4041764 History: Received June 22, 2018; Revised October 04, 2018

The present work was primarily conducted to study the wear behavior of as-received and severely deformed Al-15%Mg2Si in situ composites. The severe plastic deformation was applied using accumulative back extrusion (ABE) technique (one and three passes). The continuous dynamic recrystallization (CDRX) was recognized as the main strain accommodation and grain refinement mechanism within aluminum matrix during ABE cycles. To investigate the wear properties of the processed material, the dry sliding wear tests were carried out on both the as-received and processed samples under normal load of 10 and 20 N at room temperature, 100 °C, and 200 °C. The results indicated a better wear resistance of processed specimens in comparison to the as-received ones at room temperature. In addition, the wear performance was improved as the ABE pass numbers increased. These were related to the presence of oxide tribolayer. At 100 °C, the as-received material exhibited a better wear performance compared to the processed material; this was attributed to the formation of a work-hardened layer on the worn surface. At 200 °C, both the as-received and processed composites experienced a severe wear condition. In general, elevating the temperature changed the dominant wear mechanism from oxidation and delamination at room temperature to severe adhesion and plastic deformation at 200 °C.

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Figures

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Fig. 3

(a) Inverse pole figure image, (b) grain boundary map, (c) the corresponding SEM image of the one-pass ABEed material at 200 °C before the wear test, and (d) the conforming color code key for grains orientation

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Fig. 4

The misorientation angle distribution of the experimental material after (a) one and (b) three passes ABE. (c) and (d) show the grain size distributions of the experimental material after one and three ABE passes, respectively.

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Fig. 2

The scanning electron microscope (SEM) image of as-received Al–Mg2Si composite microstructure

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Fig. 5

Mass loss values at different conditions: (a) at room temperature and different wear test loads and (b) normal load of 10 N at different wear test temperatures for different states of experimental material

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Fig. 6

The SEM images of the worn surfaces at room temperature under normal load of 20 N: (a) as-received and (b) three ABE passes materials

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Fig. 1

Schematic demonstration of ABE procedure [20]

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Fig. 16

Variation of coefficient of friction versus sliding distance at the wear temperature of 200 °C under a normal load of 10 N for (a) as-received and (b) three-pass ABEed composite

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Fig. 17

Generated wear debris for three-pass ABEed composite under normal load of 10 N at wear test temperature of (a) 100 °C and (b) 200 °C

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Fig. 7

(a, b) The SEM images of the worn surface related to the as-received material under the normal load of 20 N at room temperature and (c) wear debris

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Fig. 8

Worn surface of (a, b) one-pass, (c) three-pass ABEed material at room temperature under a normal load of 20 N, and (d) the produced wear debris for three-pass ABEed material

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Fig. 9

Variation of coefficient of friction versus sliding distance under normal load of 20 N at room temperature for (a) as-received and (b) three-pass ABEed samples

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Fig. 10

Scanning electron micrographs of the worn surfaces cross sections under a normal load of 20 N at room temperature by two different magnifications related to (a) as-received material and (b) processed material through three passes ABE

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Fig. 11

The SEM images of the worn surfaces at wear temperature of 100 °C under normal load of 10 N: (a) as-received and (b) three-pass ABEed materials

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Fig. 12

Cross-section morphology of worn surface at wear temperature of 100 °C under normal load of 10 N: (a, b) as-received, and (c, d) processed material through three passes ABE

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Fig. 13

Variation of coefficient of friction versus sliding distance at the wear temperature of 100 °C under a normal load of 10 N for: (a) as-received and (b) three-pass ABEed materials

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Fig. 14

(a, b) SEM micrograph of the worn surface morphology of as-received composite at wear test temperature of 200 °C under applied load of 10 N at different magnifications and (c) elemental mapping of corresponding area

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Fig. 15

Scanning electron micrographs of the steel counterface of the wear tests related to three-pass ABEed materials at the wear temperatures of (a) room temperature, (b) 100 °C, (c) 200 °C under normal load of 10 N, and (d) Elemental mapping of counterface depicted in figure (c)

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