Improvement of the wear resistance of nickel-aluminium bronze and 2014-T6 aluminium alloy by application of alternating magnetic field treatment

Akram, Sufyan; Babutskyi, Anatolii; Chrysanthou, A.; Montalvão, Diogo; Whiting, Mark J.; Pizúrová, N.

doi:10.1016/j.wear.2021.203940

Cited by 18 publications

(17 citation statements)

References 25 publications

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“…According to the above theory, it can be inferred that the dislocation in the aluminium bronze alloy becomes more easily depinned and moved under the influence of the original stress field, due to the change in the electronic energy state at the pinned place during the pulsed magnetic field treatment. On the one hand, the dislocation movement reduced the stress concentration caused by the dislocation pile-up, relaxed the original stress, and reduced the residual stress of the alloy, as verified by the significant reduction in residual stress in the magnetic field treatment of aluminium alloy [ 7 ], nickel–aluminium bronze [ 9 ], EN8 special steel [ 10 ], titanium alloy [ 26 ], and magnesium alloy [ 27 ]. On the other hand, the dislocation movement somewhat altered the grain boundary angle, resulting in an apparent reduction in LAGBs and the disappearance of twin boundaries, which lowered the system energy.…”

Section: Discussionmentioning

confidence: 99%

“…The tensile strength, elongation, and residual stress of the treated sample were reduced by 1.8%, increased by 40%, and decreased by 68.9%, respectively, compared with the untreated samples. Reference [ 9 ] found that when cold-rolled nickel–aluminium bronze NAB and extruded AA2014-T6 aluminium alloy were treated with an alternating magnetic field with a magnetic induction intensity of 1.24 T, many fine κ Ⅳ phases precipitated in the NAB alloy and fine needle-like θ″ phases with a uniform distribution precipitated in the aluminium alloy. Compared with those that did not undergo magnetic field treatment, the microhardness of the NAB and aluminium alloy was increased by 6.2% and 4.5%, and the wear rate was reduced by 61% and 56%, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Pulsed Magnetic Field on the Microstructure of QAl9-4 Aluminium Bronze and Its Mechanism

Zhao

Li³

et al. 2022

Materials

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The effect of a pulsed magnetic field on the microstructure of a QAl9-4 aluminium bronze alloy was studied in this work. It was found that the dislocation density, grain boundary angle, and microhardness of the alloy significantly changed after the magnetic field treatment with a peak magnetic induction intensity of 3T, pulse duration of about 100 us, pulse interval of 10 s, and pulse time of 360. EBSD was used to test the KAM maps of the alloy microzone. It was found that the alloy’s dislocation density decreased by 10.88% after the pulsed magnetic field treatment; in particular, the dislocation in the deformed grains decreased significantly. The quantity of dislocation pile-up and the degree of distortion around the dislocation were reduced, which decreased the residual compressive stress on the alloy. Dislocation motion caused LAGB rotation, which reduced the misorientation of adjacent points inside the grain. The magnetic field induced the disappearance of deformation twins and weakened the strengthening effect of twins. The microhardness test results show that the alloy’s microhardness decreased by 8.06% after pulsed magnetic field treatment. The possible reasons for the magnetic field effect on dislocation were briefly discussed. The pulsed magnetic field might have caused the transition to the electronic energy state at the site of dislocation pinning, which led to free movement of the vacancy or impurity atom. The dislocation was easier to depin under the action of internal stress in the alloy, changing the dislocation distribution and alloy microstructure.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Pulsed Magnetic Field on the Microstructure of QAl9-4 Aluminium Bronze and Its Mechanism

Zhao

Li³

et al. 2022

Materials

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“…All these indicate a strong thermodynamic effect from the electromagnetic field. It is possible that the reported experiments in electropulsing-assisted ultrasonic surface rolling process [ 1 ] and alternating magnetic field treatment induced roughness modification [ 2 ] consist of the same mechanisms. However, further investigation is required for those experiments as the former combines the electropulse with ultrasonic processing and the latter contains a second-order phase transition.…”

Section: Discussionmentioning

confidence: 99%

“…Ye et al [ 1 ] reported that electropulsing-assisted ultrasonic surface rolling could reduce the surface roughness of pure titanium and Ti-6Al-4 V alloys. Akram et al [ 2 ] reported that alternating magnetic field treatment, which inducts an eddy current in the materials, caused surface roughness modification for nickel-aluminium bronze and aluminium alloy. Both mentioned works used electric current in solid-state alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of pulsating solidification on the surface properties of conductive materials

Qin

Bhagurkar

2022

Proc. R. Soc. A.

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Application of pulsed electric current to solidifying conductive materials leads to a rapid and significant reduction of surface roughness. This is validated experimentally in the present work for multi-component oxides. The surface geometry of the casts without and with pulsating treatment was measured using a Leica DCM-3D Profiler. The pulsating treatment reduces the roughness of solidified materials by more than 50%. The unmeasurable points, which account for nearly 2% of total area, were interpolated using an artificial multi-layer neural network. Both the experimentally measured and neural network interpolated surface profile data were implemented to the calculation of electric current free energy. The results show that the electric current free energy can overtake surface energy and provide a significant driving force to the kinetics of surface evolution in solidification. Distortion of the electric field is noticed around the interface.

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“…Various types of magnetic fields have now been developed by many academics to assist in the welding of aluminium alloys, such as electromagnetic field [14], static magnetic field [15] and alternating magnetic field [16]. However, most of the research on magnetic field-assisted welding is aimed at laser or arc welding.…”

Section: Introductionmentioning

confidence: 99%

Investigation of weld formation and porosity in 5052 aluminium alloy laser-GMA hybrid welding assisted by magnetic field with different orientations

Liu

Lin

et al. 2022

Science and Technology of Welding and Joining

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Steady magnetic field with both orientations including longitudinal magnetic field (LMF) and transverse magnetic field (TMF) was used. The influence of LMF and TMF on weld formation, porosity and mechanical property of 5052 aluminium alloy laser-gas metal arc (GMA) hybrid welding was investigated. The shielding effect of hybrid plasmas on laser energy was weakened by TMF, leading to an increase in weld depth under TMF. Porosity rate was significantly reduced to 2.61% under TMF, because keyhole stability was improved, escaping channels for bubbles were increased, and solidification time of molten pool was prolonged. As a result, the highest tensile strength (174.7 MPa) of hybrid weld was obtained at TMF, owing to the lowest porosity rate.

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Improvement of the wear resistance of nickel-aluminium bronze and 2014-T6 aluminium alloy by application of alternating magnetic field treatment

Cited by 18 publications

References 25 publications

Effect of Pulsed Magnetic Field on the Microstructure of QAl9-4 Aluminium Bronze and Its Mechanism

Effect of Pulsed Magnetic Field on the Microstructure of QAl9-4 Aluminium Bronze and Its Mechanism

Effect of pulsating solidification on the surface properties of conductive materials

Investigation of weld formation and porosity in 5052 aluminium alloy laser-GMA hybrid welding assisted by magnetic field with different orientations

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