Accession Number : ADA182940

Title :   Fine-Scale Mechanical Properties of Sliding Solids.

Descriptive Note : Final technical rept. 12 Mar 84-12 Dec 86,

Corporate Author : LANCASTER UNIV (ENGLAND) DEPT OF PHYSICS

Personal Author(s) : Ross,J D ; Pollock,H M

PDF Url : ADA182940

Report Date : 28 Feb 1987

Pagination or Media Count : 94

Abstract : This report describes fine-scale contact experiments specifically designed to investigate the mechanical properties of materials at the submicroscopic level. The first part deals with experiments carried out using an ultra-high vacuum (UHV) mechanical microprobem in which adhesion and friction are measured between a sharply-pointed metal tip and a flat surface at very light loads. The results show that, for a metal-metal or metal-ceramic interface, the adhesion and frictional resistance to tangential sliding are highest for clean surfaces in UHV. However, for contacts between a metal tip and an amorphous metallic glass both adhesion and friction are lower after standard cleaning procedures in UHV. Part II describes fine-scale indentation measurements on thin films ad ion-implanted surfaces carried out in the laboratory ambient. It is shown that surface layers less than a few hundred nanometres thickness can be successfully characterised in terms of plastic, elastic and time-dependent properties. Keywords: Adhension, Friction, Microhardness, Ultra-high vacuum, Mechanical microprobe, Sub-micron indentation device, Microdeformation, Mechanical characterisation.

Descriptors :   *ADHESION, *FRICTION, *SLIDING CONTACTS, *MICROPROBES, ELASTIC PROPERTIES, RESISTANCE, MECHANICAL PROPERTIES, GLASS, METALS, DEFORMATION, SURFACES, ION IMPLANTATION, MATERIALS, CERAMIC MATERIALS, INTERFACES, MICROHARDNESS, CLEANING, LAYERS, PLASTICS, THIN FILMS, ULTRAHIGH VACUUM, LIGHTWEIGHT, LOADS(FORCES), SLIDING, TANGENTS, THICKNESS, TIME DEPENDENCE, GREAT BRITAIN

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE