Fretting wear behaviour of ultrafine-grained copper produced by cryogenic temperature extrusion machining

Abstract

Cryogenic temperature extrusion machining (CT-EM), as a new process, was first applied for preparing ultrafine-grained (UFG) copper strips. The microstructure evolution and mechanical properties (hardness and fretting wear) were characterised by electron backscatter diffraction and transmission electron microscopy methods. Refined grains (450 nm) and high dislocation density could be obtained by CT-EM because of effectively suppressing heat generation and the annihilation of dislocations. As a result, the CT-EM sample exhibited enhanced fretting wear properties, e.g. a much lower friction coefficient (reducing 0.1–0.2) and a lower wear loss (decreasing 32–45%) were achieved due to its enhanced hardness and refined microstructure. In-depth, the delamination and oxidation wear proved to be the primary wear mechanism of the CT-EM sample under dry wear conditions.

Tribological behaviours of Mo–Si–B–xTi alloys against Al2O3 ceramic and AISI 52100 steel

“…Moreover, it can also be observed that the MoSiBTi alloys experience severe plastic deformation, and the worn surface shows large and continuous plowing grooves along the sliding direction, which is a typical characteristic produced by two-body abrasion wear. This is because the Al 2 O 3 ceramic has a much higher hardness than the MoSiBTi alloys; once the hard abrasive particles intrude into the ductile metal matrix, severe plastic deformation and plowing are inevitable [33]. The decreased hardness and strength of MoSiBTi alloys leads to more severe plastic deformation and plowing on the wear tracks, and thus results in an increased wear loss.…”