Critical analysis of a coaxial configuration for the characterization of adhesive wear and its application to Al and Al–Sn alloys

Figueroa, Carlos; Jacobo, Víctor H.; Ortíz, A.; Schouwenaars, Rafael

doi:10.1007/s11249-015-0548-8

Cited by 7 publications

(11 citation statements)

References 26 publications

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“…Previous studies [25,26] showed a direct relation between the roughness parameters and the size of the wear track for materials with similar constitutive elements as is the case of commercially pure aluminum, recrystallized SAE783 and cold rolled SAE783. As mentioned above, Rabinowicz [30,31] reported lower tribological compatibility between the tribopair Al-Fe than between Cu-Fe, attributing the higher adhesion to the higher the solubility observed in the binary phase diagram, this was studied deeper by Sliding direction is perpendicular to the image Fig.…”

Section: Discussionmentioning

confidence: 88%

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Tribological and Microstructural Characterization of Ultrafine Layers Induced by Wear in Ductile Alloys

et al. 2016

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This work studies the ultrafine subsurface layer produced in Al-Sn and Cu alloys in contact with AISI9840 steel. The tribological tests were conducted at room temperature without lubrication in a coaxial tribometer. A first microstructural characterization was performed using conventional scanning electron microscopy (SEM) and atomic force microscopy (AFM). Grain refinement mapping was performed by means of Electron Backscattering Diffraction (EBSD). The wear process, during which tribolayers are formed, leads to significant differences between the structure of the sub-micrometrical layer below the tribolayer and that of the bulk. SEM images show severe mechanical mixing in the surface of the worn zones, whereas EBSD observations allow identifying the mechanically homogenized layers as a sub-micro-crystalline material with a cellular structure aligned along the sliding direction.

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Section: Discussionmentioning

confidence: 88%

“…In the present research, a coaxial tribometer [25,26] based on the geometry proposed in [27,28] is used to generate a tribolayer under dry friction conditions. The materials tested are SAE783 alloy (Al 20% Sn 1% Cu) and C11000 Cu alloy.…”

Section: Introductionmentioning

confidence: 99%

Tribological and Microstructural Characterization of Ultrafine Layers Induced by Wear in Ductile Alloys

et al. 2016

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“…This is at least partially due to a difference in application. Here, the development of the analysis was guided by the study of strain hardening during wear of metallic materials [27][28][29][30]. For bulk metallic materials, the elastic properties are generally well known and show almost insignificant influence of thermal and mechanical processes.…”

Section: Discussionmentioning

confidence: 99%

“…The study is motivated by research in the Al-Sn system which is widely used for the journal bearings of compact combustion engines. The alloy is used in a bilayer with a steel sheet backing and is modified superficially when exposed to wear [27][28][29][30], which makes tensile testing impractical (although free-standing sheet can be easily produced for research purposes). Existing methods for the analysis of tensile properties through indentation testing [2][3][4][5][6][7][8] are not applicable to this material due to a viscous component in the total strain [31,32].…”

Section: Introductionmentioning

confidence: 99%

Indentation Curves in Viscoplastic Alloys: Mathematical Model, Fitting Procedures, and Application to the Room-Temperature Creep of an Al-Sn Alloy

Jacobo

Ortíz

Schouwenaars

2016

Advances in Materials Science and Engineering

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Hardness is an important design parameter but, in rate-dependent materials, its value depends on the indentation speed and dwell time during measurement. Dimensional analysis for indentation testing provides rigorous descriptions for the load-displacement curves of elastoplastic materials; viscoplastic materials can be treated likewise by neglecting the plastic part of the deformation, which is not accurate for most engineering alloys. This work presents a methodology for constructing model indentation curves taking into account concurrent viscous and plastic strains, as well as corrections for tip roundness, load frame compliance, and the point of first contact. A procedure is presented to calculate the parameters of a single model curve by fitting to multiple experimental curves, incorporating the numerical solutions of the differential equation describing viscoplastic behaviour. The procedure is applied to Vickers indentation in brass and steel calibration blocks and to a SAE783 Al-Sn alloy for journal bearings, where creep at room temperature is observed. The soundness of the approach is demonstrated by the large reduction of statistical uncertainty on the parameters describing the indentation curves. A rate-independent hardness will be found and a brief comment is provided on the comparison between creep analysis by indentation and uniaxial tension.

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“…This is achieved in processes such as Surface mechanical attrition [ 4 , 5 , 6 ], large strain machining [ 7 ], ultrasonic surface modification [ 8 ], high-speed pounding [ 9 , 10 ] or sliding contact modification [ 11 , 12 ]. The coaxial configuration proposed by Figueroa et al [ 13 ] for the analysis of adhesive wear induces significant surface modification as well and was, independently, modified as Surface Spinning Strengthening by Ren et al [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Surface Nanostructuring of a CuAlBe Shape Memory Alloy Produces a 10.3 ± 0.6 GPa Nanohardness Martensite Microstructure

et al. 2020

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Severe plastic deformation (SPD) has led to the discovery of ever stronger materials, either by bulk modification or by surface deformation under sliding contact. These processes increase the strength of an alloy through the transformation of the deformation substructure into submicrometric grains or twins. Here, surface SPD was induced by plastic deformation under frictional contact with a spherical tool in a hot rolled CuAlBe-shape memory alloy. This created a microstructure consisting of a few course martensite variants and ultrafine intersecting bands of secondary martensite and/or austenite, increasing the nanohardness of hot-rolled material from 2.6 to 10.3 GPa. In as-cast material the increase was from 2.4 to 5 GPa. The friction coefficient and surface damage were significantly higher in the hot rolled condition. Metallographic evidence showed that hot rolling was not followed by recrystallisation. This means that a remaining dislocation substructure can lock the martensite and impedes back-transformation to austenite. In the as-cast material, a very fine but softer austenite microstructure was found. The observed difference in properties provides an opportunity to fine-tune the process either for optimal wear resistance or for maximum surface hardness. The modified hot-rolled material possesses the highest hardness obtained to date in nanostructured non-ferrous alloys.

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Critical analysis of a coaxial configuration for the characterization of adhesive wear and its application to Al and Al–Sn alloys

Cited by 7 publications

References 26 publications

Tribological and Microstructural Characterization of Ultrafine Layers Induced by Wear in Ductile Alloys

Tribological and Microstructural Characterization of Ultrafine Layers Induced by Wear in Ductile Alloys

Indentation Curves in Viscoplastic Alloys: Mathematical Model, Fitting Procedures, and Application to the Room-Temperature Creep of an Al-Sn Alloy

Surface Nanostructuring of a CuAlBe Shape Memory Alloy Produces a 10.3 ± 0.6 GPa Nanohardness Martensite Microstructure

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