Thermal effects on mild wear transitions in dry sliding of an aluminum alloy

Wilson, Scott; Alpas, A.T.

doi:10.1016/s0043-1648(99)00017-4

Cited by 79 publications

(32 citation statements)

References 28 publications

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“…They found that the dynamic recrystallization in the subsurface sliding region decided the threshold temperature of the transition. Wilson and Alpas also reported that the mild-to-severe wear transitions can be induced in metal on metal dry sliding by applying external heating to the specimens, which was demonstrated in elevated temperature sliding wear experiments on Al alloys and Al matrix composites and 60/40 brass where the transitions occurred at critical temperatures [10]. This is almost the same situation as the present test at an elevated temperature of 200°C.…”

Section: Critical Surface Temperaturesupporting

confidence: 81%

“…Thus, a mild wear prevailed under the ambient temperature of 200°C and the low loads of 12.5-25 N. In this case, the oxidative wear should be the predominant wear mechanism. Wilson and Alpas [9,10] considered that this wear was mixing/ oxidation wear.…”

Section: Wear Mechanism and Its Transitionmentioning

confidence: 99%

“…Wilson and Alpas [10] further pointed out that the transition to severe wear was marked by continuous extrusion of materials from the sliding interfaces. They found that the dynamic recrystallization in the subsurface sliding region decided the threshold temperature of the transition.…”

Section: Critical Surface Temperaturementioning

confidence: 99%

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Sliding Wear Characteristics of AZ91D Alloy at Ambient Temperatures of 25–200 °C

et al. 2010

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The dry sliding wear tests were performed for AZ91D alloy under the loads of 12.5-300 N and the ambient temperatures of 25-200°C. We studied the wear characteristics of AZ91D alloy as a function of the normal load and the ambient temperature. The mild-to-severe wear transition occurred with increasing the load and the critical load reduced with the ambient temperature rising. However, no matter how high the ambient temperature was in the range of 25-200°C, the mild wear prevailed under the lower loads. Especially, the AZ91D alloy presented a lower wear rate at 200°C than at 25 and 100°C under the low loads of 12.5-25 N, but vice versa under the loads of more than 25 N. These phenomena seem to be contradictory to the popular view that the mild-to-severe wear transition is controlled by the critical surface temperature. These may be attributed to a thick and hard mechanical mixing layer (MML) containing the mixture of MgAl 2 O 4 and Mg on the worn surface. The MML thickened with increasing the ambient temperature (under the low loads), effectively reduced wear and markedly elevated the critical surface temperature. The oxidative wear and delamination wear successively predominated in the mild wear regime; the gross plastic-induced wear would prevail in the severe wear regime.

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Section: Critical Surface Temperaturesupporting

confidence: 81%

Section: Wear Mechanism and Its Transitionmentioning

confidence: 99%

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Sliding Wear Characteristics of AZ91D Alloy at Ambient Temperatures of 25–200 °C

et al. 2010

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“…The first one is given by the formation and spalling of a mechanically mixed layer (MML) containing Al and Fe (from the counterface) in metallic form and alumina. In a later paper, the authors call this wear regime ''mixing/oxidation'' [23]. The second one is given by metallic delamination of plate-like debris.…”

Section: Introductionmentioning

confidence: 99%

Mild Sliding Wear of Fe–0.2%C, Ti–6%Al–4%V and Al-7072: A Comparative Study

Straffelini

Molinari

2010

Tribol Lett

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The mild sliding wear of Fe-0.2%C, Ti-6%Al-4%V and Al-7072 was investigated by means of pin-ondisc sliding tests. The applied pressure was 1 MPa and the sliding velocity was varied between 0.2 and 1 m/s. The sliding behaviour was followed by continuous measurements of the friction coefficient, pin wear and pin temperature. For the Fe alloy, wear was mixed (delamination and oxidation), and friction and wear coefficients were found to decrease with sliding velocity. The Al and Ti alloys displayed a different behaviour, characterised by the occurrence of sliding distance transitions at 0.8 and 1 m/s for the Al alloy, and at 0.4 up to 1 m/s for the Ti alloy. Before the transition, the wear coefficient of the Al alloy was very low, because of the presence of a compacted tribolayer on the sliding surface. After the transition wear was by delamination: the wear rate increased but the friction coefficient decreased. For the Ti alloy, wear occurred by oxidation and was quite high before the transition. After the transition, both the wear rate and the friction coefficient decreased, although the wear process became unstable with repeated oscillations in the friction coefficient. The results allowed us to highlight the role of flash temperature in determining the wear mechanisms of the alloys under study and the necessity of properly considering the sliding distance transitions to make reliable comparisons and obtain guidelines for safe operations.

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“…10(f) and EDX 11(f). Transitions in wear mechanisms of the metals in sliding contacts have been attributed to their increased sensitivity to the onset of intense shearing, surface sliding temperatures and shear deformation rates, in the wear contact zone [32] in addition to oxidation phenomena and the above maps include such transitions.…”

Section: Wear Mapsmentioning

confidence: 99%

Mapping wear mechanisms of TiC/Ti composite coatings

Rasool

Mridha

Stack

2015

Wear

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In this work, a fundamental study of the wear transition regimes with respect to sliding speed and normal load was carried out for a pin-on-disk sliding couple, involving hardened steel (disks) and titanium base titanium carbide composite coatings (pins). The coating was deposited using a Tungsten Inert Gas (TIG) welding torch melting process. The sliding speed was varied from 0.38 to 1.5m s-1, and the normal load was varied from 10 to 50N. Dry sliding wear behaviour of the disks was characterized by abrasive-oxidative wear at lower normal loads while adhesive-oxidative wear predominated at higher loads with iron oxide transfer to the TiC composite coated pins. In contrast, micro-polishing and adhesive wear predominated for the TiC composite coatings pins along with very mild abrasive wear in evidence. However, the wear regime depended on the conditions with a range of transitions observed over the sliding speeds and loads tested. Wear maps have been constructed to represent the wear mode transitions and the observed wear mechanisms have been discussed.

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Thermal effects on mild wear transitions in dry sliding of an aluminum alloy

Cited by 79 publications

References 28 publications

Sliding Wear Characteristics of AZ91D Alloy at Ambient Temperatures of 25–200 °C

Sliding Wear Characteristics of AZ91D Alloy at Ambient Temperatures of 25–200 °C

Mild Sliding Wear of Fe–0.2%C, Ti–6%Al–4%V and Al-7072: A Comparative Study

Mapping wear mechanisms of TiC/Ti composite coatings

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