Friction anisotropy dependence on morphology of GLAD W films

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL Tribology International Pub Date : 2025-02-10 DOI:10.1016/j.triboint.2025.110556

Guilherme B. Rodrigues, Nicolas Martin, Fabien Amiot, Guillaume Colas

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Abstract

Scratch tests on tungsten GLAD films examined friction anisotropy at various deposition angles (

α

), normal forces (

F_{N}

), and scratching directions (

ϕ

). A linear model of the coefficient of friction (

μ

) revealed four behavior groups, ranging from isotropic (

α

= 0°and 30°) to orthotropic (

α \geq

60°). Intermediate angles (40°

\leq α \leq

60°) showed slight non-centrosymmetric anisotropy. Post-scratch analysis linked these behaviors to film morphology. A transition from dense to columnar structures, with columns elongated perpendicular to the atom flux, influenced plasticity. Less deformation occurred along scratching directions (

ϕ

= 90°/270°) due to column chaining, resulting in higher friction. A mechanical model highlighted how morphology-driven plasticity variations explain the anisotropic behavior.

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来源期刊

Tribology International 工程技术-工程：机械

CiteScore

10.10

自引率

16.10%

发文量

627

审稿时长

35 days

期刊介绍： Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.