Indentation and friction of Zr-based bulk metallic glasses on nano-scale

Ma, Mingzhen; Zong, Haitao; Wang, H.Y.; Zhang, W.G.; Song, Ai‐jun; Liang, S.X.; Wang, Q.; Zhang, X.Y.; Qin, Jing; Li, G.; Liu, R.P.

doi:10.1016/j.matlet.2008.07.019

Cited by 18 publications

(5 citation statements)

References 19 publications

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“…The coefficient of friction increases with scratching depth, see Fig. 10(a), in agreement with experiments [53]. The trend seems to be almost linear for depths ≥ 30 Å.…”

Section: Scratching Depth Dependencesupporting

confidence: 89%

Nanoscratching of metallic glasses – An atomistic study

Avila

Küchemann

Alhafez

et al. 2019

Tribology International

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Tribological properties of materials play an important role in engineering applications. Up to now, a number of experimental studies have identified correlations between tribological parameters and the mechanical response. Using molecular dynamics simulations, we study abrasive wear behavior via nanoscratching of a Cu 64.5 Zr 35.5 metallic glass. The evolution of the normal and transverse forces and hardness values follows the behavior well known for crystalline substrates. In particular, the generation of the frontal pileup weakens the response of the material to the scratching tip and leads to a decrease of the transverse hardness as compared to the normal hardness. However, metallic glasses soften with increasing temperature, particularly above the glass transition temperature thus showing a higher tendency to structurally relax an applied stress. This plastic response is analyzed focusing on local regions of atoms which underwent strong von-Mises strains, since these are the basis of shear-transformation zones and shear bands. The volume occupied by these atoms increases with temperature, but large increases are only observed above the glass transition temperature. We quantify the generation of plasticity by the concept of plastic efficiency, which relates the generation of plastic volume inside the sample with the formation of external damage, viz. the scratch groove. In comparison to nanoindentation, the generation rate of the plastic volume during nanoscratching is significantly temperature dependent making the glass inside more damage-tolerant at lower temperature but more damage-susceptible at elevated temperatures.

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“…The coefficient of friction increases with scratching depth, see Fig. 10(a), in agreement with experiments [53]. The trend seems to be almost linear for depths ≥ 30 Å.…”

Section: Scratching Depth Dependencesupporting

confidence: 89%

Nanoscratching of metallic glasses – An atomistic study

Avila

Küchemann

Alhafez

et al. 2019

Tribology International

View full text Add to dashboard Cite

show abstract

“…Nanomechanical and nanotribological property studies are needed to develop a fundamental understanding of surface and interfacial phenomena at small scale, such as the micro/nanostructures used in micro-electro-mechanical systems (MEMS), nano-electromechanical systems (NEMS), and other industrial applications. However, although mechanical scratching has been widely used to evaluate the nanotribological properties of various metallic, ceramic and polymeric thin film materials [15], to date only few experimental investigations have been dedicated to amorphous metals [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance of metallic glasses during nanoscratch tests

et al. 2010

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“…However, only several literatures about friction and wear behavior in BMGs can be found so far [8][9][10] that crystallization increases both the scratch friction coefficient and the worn-out cross-sectional area [11]. Ma et al studied the friction behavior of the as-cast, relaxed and crystallized Zr 41 Ti 14 Cu 12.5 Ni 10 Be 22.5 BMG on nano-scale by nano-indentation and found the coefficient of sliding friction of BMG increased with increasing load and correlated to the differences in structure, density and hardness [12]. Parlar et al investigated the wear and friction characteristics of a Zr 52.5 T 5 Cu 17.9 Ni 14.6 Al 10 BMG under dry conditions, demonstrating that load and sliding speed significantly affect the wear characteristics of BMG material and sliding distance is less effective on wear [13].…”

Section: Introductionmentioning

confidence: 99%