title: Property Self-Optimization During Wear of MoS2.
abstract: Knowledge of their bulk physical properties often guides selection of appropriate tribological coating materials. However, these properties as well as the microstructure evolve dramatically under the extreme conditions imposed during mechanical wear. The dynamic response ultimately governs the material's wear performance; thus, understanding the dynamic evolution of the system is critical. This work characterizes the change in mechanical properties and microstructure as a function of wear cycles in model MoS2films using a combination of nanowear testing, transmission electron microscopy, and site-specific nanopillar compression. Notably, mechanical wear enhances the mechanical properties of the MoS2while simultaneously evolving a microstructure that reduces the coefficient of friction and wear rate. We hypothesize that this self-optimizing behavior underpins the exceptional lubricity and antiwear performance of MoS2.
authors.affiliation: International Centre for Advanced Materials (ICAM; UIUC Spoke), Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign , 104 South Goodwin Avenue, MC-230, Urbana, Illinois 61801, United States.
authors.forename: Rui
authors.initials: R
authors.lastname: Hao
authors.affiliation: International Centre for Advanced Materials (ICAM; Manchester Hub), School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.
authors.forename: Aleksander A
authors.initials: AA
authors.lastname: Tedstone
authors.affiliation: International Centre for Advanced Materials (ICAM; Manchester Hub), School of Materials, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.
authors.forename: David J
authors.identifier: http://orcid.org/0000-0001-5950-1350
authors.initials: DJ
authors.lastname: Lewis
authors.affiliation: BP Technology Centre , Whitchurch Hill, Pangbourne, Berkshire RG8 7QR, United Kingdom.
authors.forename: Chris P
authors.initials: CP
authors.lastname: Warrens
authors.affiliation: BP Technology Centre , Whitchurch Hill, Pangbourne, Berkshire RG8 7QR, United Kingdom.
authors.forename: Kevin R
authors.initials: KR
authors.lastname: West
authors.affiliation: BP Technology Centre , Whitchurch Hill, Pangbourne, Berkshire RG8 7QR, United Kingdom.
authors.forename: Philip
authors.initials: P
authors.lastname: Howard
authors.affiliation: BP Technology Centre , Whitchurch Hill, Pangbourne, Berkshire RG8 7QR, United Kingdom.
authors.forename: Sander
authors.initials: S
authors.lastname: Gaemers
authors.affiliation: International Centre for Advanced Materials (ICAM; UIUC Spoke), Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign , 104 South Goodwin Avenue, MC-230, Urbana, Illinois 61801, United States.
authors.forename: Shen J
authors.initials: SJ
authors.lastname: Dillon
authors.affiliation: International Centre for Advanced Materials (ICAM; Manchester Hub), School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.|International Centre for Advanced Materials (ICAM; Manchester Hub), School of Materials, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.
authors.forename: Paul
authors.identifier: http://orcid.org/0000-0001-8744-9174
authors.initials: P
authors.lastname: O'Brien
keywords: antiwear films; in situ electron microscopy; molybdenum disulfide; transition-metal dichalcogenides; tribology