Sliding wear-induced microstructure evolution of nanocrystalline and coarse-grained AZ91D Mg alloy

Sun, Hailin; Shi, Yunzhu; Zhang, Mingxing

doi:10.1016/j.wear.2008.08.004

Cited by 41 publications

(8 citation statements)

References 21 publications

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“…As shown in Figure 7(a), however, the sliding surface of the pin specimen reveals very slight adhesion wear, and a small change of the surface roughness is observed. This is quite different from the previous results on tribological properties of the conventional AZ91D alloy and their matrix composites [17] as mentioned above. This means that high hardness of about 140 Hv of the extruded Mg 97 Y 2 Zn 1 alloy via RPW process is enough to improve the defensive to the adhesion wear due to the plastic deformation in sliding and contacting with the counter disk specimen.…”

Section: Microstructural and Mechanical Responses Of Mg Alloy Composicontrasting

confidence: 99%

Tribological Analysis of Mg₂Si Particulates Reinforced Powder Metallurgy Magnesium Alloy Composites under Oil Lubrication Condition

Kondoh

Umeda

Kawabata

2009

Advances in Materials Science and Engineering

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Recommended by Ming-Xing ZhangFor the evaluation of wear behavior of Mg composites under oil lubrication conditions, powder metallurgy Mg 97 Y 2 Zn 1 alloy reinforced with additive Mg 2 Si particles were fabricated by the repeated plastic working (RPW) and hot extrusion. The RPW process was effective in refining both Mg 2 Si reinforcements and α-Mg grains causing the matrix hardening. When increasing the repetition number of RPW process from 200 to 600 cycles, the particle size of Mg 2 Si additives changed from 8 μm to 1∼2 μm, and α-Mg grain size was 1 μm or less. With regard to the defensive and offensive properties of Mg alloys reinforced with Mg 2 Si dispersoids, the composite had superior adhesive wear resistance compared with the conventional Mg alloys because of its extremely high microhardness of 95∼180 Hv by RPW process. The uniform distribution of refined Mg 2 Si particles was useful for improving both defensive and offensive properties against AZ31B counter disk specimens. The Mg 2 Si prominent dispersoids in the matrix were also effective in forming the oil grooves around them, and caused the low and stable friction coefficient. On the other hand, in the case of the composite containing coarse Mg 2 Si particles, severely deep scratches were given on the counter face of the AZ31B disk, and resulted in an unstable and high friction coefficient.

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Section: Microstructural and Mechanical Responses Of Mg Alloy Composicontrasting

confidence: 99%

Tribological Analysis of Mg₂Si Particulates Reinforced Powder Metallurgy Magnesium Alloy Composites under Oil Lubrication Condition

Kondoh

Umeda

Kawabata

2009

Advances in Materials Science and Engineering

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“…In addition to observed fatigue-driven grain growth, studies on the cyclic wear behavior of NC and UFG metals [33,134] show that localized grain growth also occurs as a result of the deformation during scratch testing. By contrast, NC surface layers produced by SMAT showed no change in the microstructure after wear testing [135], possibly due to the high degree of cold work in the surface layer.…”

Section: Fatigue-induced Grain Growthmentioning

confidence: 82%

“…A literature survey on this topic shows that NC metals perform consistently better in terms of the coefficient of friction and wear rates than their coarser grained counterparts [33, 34, [133][134][135]; although these trends do not seem to hold true above a threshold of applied normal force, a phenomenon that may be related to deformation-induced grain growth as discussed in the following section.…”

Section: Cyclic Plasticitymentioning

confidence: 99%

A Review of Fatigue Behavior in Nanocrystalline Metals

2009

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Nanocrystalline metals have been shown to exhibit unique mechanical behavior, including break-down in Hall-Petch behavior, suppression of dislocation-mediated plasticity, induction of grain boundary sliding, and induction of mechanical grain coarsening. Early research on the fatigue behavior of nanocrystalline metals shows evidence of improved fatigue resistance compared to traditional microcrystalline metals. In this review, experimental and modeling observations are used to evaluate aspects of cyclic plasticity, microstructural stability, crack initiation processes, and crack propagation processes. In cyclic plasticity studies to date, nanocrystalline metals have exhibited strongly rate-dependent cyclic hardening, suggesting the importance of diffusive deformation mechanisms such as grain-boundary sliding. The cyclic deformation processes have also been shown to cause substantial mechanicallyinduced grain coarsening reminiscent of coarsening observed during large-strain monotonic deformation of nanocrystalline metals. The crack-initiation process in nanocrystalline metals has been associated with both subsurface internal defects and surface extrusions, although it is unclear how these extrusions form when the grain size is below the scale necessary for persistent slip band formation. Finally, as expected, nanocrystalline metals have very little resistance to crack propagation due to limited plasticity and the lack of crack path tortuosity among other factors. Nevertheless, like bulk metallic glasses, nanocrystalline metals exhibit both ductile fatigue striations and metal-like Paris-law behavior. The review provides both a comprehensive critical survey of existing literature and a summary of key areas for further investigation.

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“…Therefore, the CG Ti was prone to enduring relatively severe plastic deformation during present sliding wear conditions. Some researchers reported that nanocrystalline Cu and Mg alloys were produced by deformation under large sliding loads [24,25]. Recently Jain et al [26] found that the plastic deformation induced the formation of a dense array of deformation twins on the surface of pure Ti during the wear test in liquid nitrogen environment.…”

Section: Resultsmentioning

confidence: 99%

Tribological Behaviour of Pure Ti with a Nanocrystalline Surface Layer Under Different Loads

Wen

Hodgson

et al. 2011

Tribol Lett

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Surface mechanical attrition treatment (SMAT), a novel surface severe plastic deformation method, was carried out for titanium (Ti) to create a gradient-structured Ti (SMAT Ti). The tribological behaviour was studied under different loads and dry sliding conditions. The results showed that the deformation layer of SMAT Ti was about 160 lm. The friction and wear results showed that the wear resistance of SMAT Ti was enhanced compared to the coarse-grained (CG) counterpart. SMAT Ti showed abrasive wear under 1 and 5 N, and exhibited abrasive and adhesive wear under 2 N. While CG Ti showed abrasive and adhesive wear under 1-2 N, and exhibited abrasive wear under 5 N for the work hardening effects.

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Sliding wear-induced microstructure evolution of nanocrystalline and coarse-grained AZ91D Mg alloy

Cited by 41 publications

References 21 publications

Tribological Analysis of Mg₂Si Particulates Reinforced Powder Metallurgy Magnesium Alloy Composites under Oil Lubrication Condition

Tribological Analysis of Mg₂Si Particulates Reinforced Powder Metallurgy Magnesium Alloy Composites under Oil Lubrication Condition

A Review of Fatigue Behavior in Nanocrystalline Metals

Tribological Behaviour of Pure Ti with a Nanocrystalline Surface Layer Under Different Loads

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Sliding wear-induced microstructure evolution of nanocrystalline and coarse-grained AZ91D Mg alloy

Cited by 41 publications

References 21 publications

Tribological Analysis of Mg2Si Particulates Reinforced Powder Metallurgy Magnesium Alloy Composites under Oil Lubrication Condition

Tribological Analysis of Mg2Si Particulates Reinforced Powder Metallurgy Magnesium Alloy Composites under Oil Lubrication Condition

A Review of Fatigue Behavior in Nanocrystalline Metals

Tribological Behaviour of Pure Ti with a Nanocrystalline Surface Layer Under Different Loads

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Product

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Tribological Analysis of Mg₂Si Particulates Reinforced Powder Metallurgy Magnesium Alloy Composites under Oil Lubrication Condition

Tribological Analysis of Mg₂Si Particulates Reinforced Powder Metallurgy Magnesium Alloy Composites under Oil Lubrication Condition