Wear, vibration and acoustic emission characterization of sliding friction processes of coarse-grained and ultrafine-grained copper

被引：19

作者：

Filippov, Andrey V. ^{[1
,2
]}

Tarasov, Sergei Yu. ^{[1
,2
]}

Fortuna, Sergei V. ^{[2
]}

Podgornykh, Oleg A. ^{[1
]}

Shamarin, Nikolai N. ^{[2
]}

Vorontsov, Andrey V. ^{[2
]}

机构：

[1] Tomsk Polytech Univ, Lenina Ave 30, Tomsk, Russia

[2] RAS, Inst Strength Phys & Mat Sci, SB, Acad Skii Ave 2-4, Tomsk, Russia

来源：

WEAR | 2019年 / 424卷

基金：

俄罗斯科学基金会;

关键词：

Friction; Wear; Ultrafine-grained; Subsurface deformation; Copper; ECAP; Acoustic emission; DEFORMATION; BEHAVIOR; IDENTIFICATION; RESISTANCE; VELOCITY; SIGNALS; TIME; ECAP;

D O I：

10.1016/j.wear.2019.02.014

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Microstructural evolution of copper samples after equal channel angular pressing (ECAP) have been studied. The equiaxed ultrafine-grains first appeared after 4 ECAP passes and then occupied the bulk of the sample after 8 and 12 passes thus forming more homogeneous grain-subgrain structures. High values of ultimate tensile strength 653 MPa and microhardness (180 HV) have been achieved. Tribological testing under unlubricated sliding friction of as-annealed and ECAPed copper samples against a steel counterbody have been carried out with simultaneous registration of vibration acceleration (VA) and acoustic emission (AE) signals. Wear reduced with the ECAP pass number changed from 0 to 12. Structural evolution of metal in different structural states after sliding tests has been studied and its effect on wear and friction has been revealed. The ECAPed samples formed thick oxidized layers on their worn surfaces which then deteriorated by subsurface fracture. This subsurface cracking changed the sliding friction dynamics as well as the AE signal parameters. Correlations between the tribological system vibrations and AE signal parameters have been established.

引用

页码：78 / 88

页数：11

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