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Influence of morphology on friction anisotropy of GLAD Mo films.

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Title: Influence of morphology on friction anisotropy of GLAD Mo films.
Authors: Rodrigues, Guilherme B.1 (AUTHOR) guilherme.bernardes@femto-st.fr, Boulet, Pascal2 (AUTHOR), Martin, Nicolas1 (AUTHOR), Amiot, Fabien1 (AUTHOR), Colas, Guillaume1 (AUTHOR) guillaume.colas@femto-st.fr
Source: Tribology International. Jun2026, Vol. 218, pN.PAG-N.PAG. 1p.
Subjects: Morphology, Anisotropy, Glancing angle deposition, Porosity, Friction, Coulomb friction, Thin films, Columnar structure (Metallurgy)
Abstract: Frictional behavior of molybdenum thin films deposited by Glancing Angle Deposition (GLAD) was investigated at various deposition angles (α) using single-scratch tests under different loads and directions. Films deposited at α ≥ 5 0 ∘ developed elliptical columnar structures, resulting in orthotropic anisotropy due to direction-dependent plastic deformation. Increasing the deposition angle enhanced intercolumnar porosity, thereby reducing both friction and anisotropy. Conversely, the film deposited at α = 4 0 ∘ exhibited strong anisotropy and a non-Coulombic frictional response. Moreover, this film showed non-centrosymmetric behavior, requiring a non-linear model to accurately describe its frictional anisotropy. [Display omitted] • GLAD Mo films show orthotropic friction due to column chains at high deposition angles. • Increased porosity at grazing α reduces friction and anisotropy via lower column interaction. • For α = 40°, friction behavior is non-Coulombic and non-centrosymmetric. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Frictional behavior of molybdenum thin films deposited by Glancing Angle Deposition (GLAD) was investigated at various deposition angles (α) using single-scratch tests under different loads and directions. Films deposited at α ≥ 5 0 ∘ developed elliptical columnar structures, resulting in orthotropic anisotropy due to direction-dependent plastic deformation. Increasing the deposition angle enhanced intercolumnar porosity, thereby reducing both friction and anisotropy. Conversely, the film deposited at α = 4 0 ∘ exhibited strong anisotropy and a non-Coulombic frictional response. Moreover, this film showed non-centrosymmetric behavior, requiring a non-linear model to accurately describe its frictional anisotropy. [Display omitted] • GLAD Mo films show orthotropic friction due to column chains at high deposition angles. • Increased porosity at grazing α reduces friction and anisotropy via lower column interaction. • For α = 40°, friction behavior is non-Coulombic and non-centrosymmetric. [ABSTRACT FROM AUTHOR]
ISSN:0301679X
DOI:10.1016/j.triboint.2026.111721