Effects of Dispersoids on Wear Behavior of Cu-Based Nanocomposite Containing SiO2 Nanoparticles

Solid particles in discontinuous reinforcement metal matrix composites (DRMMCs) drastically improve their strength. Since the strength of DRMMCs is improved by the Orowan mechanism, smaller particles, such as nanoparticles, are effective as dispersoids. In this study, the effects of nanoparticles on...

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Bibliographic Details
Published inJpn J Appl Phys Vol. 51; no. 1; pp. 01AK01 - 01AK01-6
Main Authors Sato, Hisashi, Miura-Fujiwara, Eri, Watanabe, Yoshimi
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.01.2012
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Summary:Solid particles in discontinuous reinforcement metal matrix composites (DRMMCs) drastically improve their strength. Since the strength of DRMMCs is improved by the Orowan mechanism, smaller particles, such as nanoparticles, are effective as dispersoids. In this study, the effects of nanoparticles on the sliding wear behavior of DRMMCs are investigated using Cu-based composites containing 0.6, 1.2, and 1.7 vol % SiO 2 particles. Wear resistance of the Cu--SiO 2 composite is improved by increasing the volume fraction of SiO 2 particles. Moreover, the amount of wear for the Cu--SiO 2 composites increases with increasing sliding distance and then becomes saturated beyond about 1000 m. Vickers hardness for all specimens becomes the same regardless of the volume fraction of SiO 2 particles as the sliding distance increases. This behavior can be explained by the work-hardening rate of the Cu matrix and the critical hardness for adhesion with a counter-material. It is found that nanoparticles in DRMMCs improve wear resistance by increasing the work-hardening rate of the metal matrix.
Bibliography:Details of Cu--SiO 2 composites fabricated by internal oxidation. (a) Initial microstructure of Cu--0.6 vol % SiO 2 and (b) Vickers hardness of Cu--SiO 2 composites. Width of wear groove as a function of sliding distance for Cu--SiO 2 composites. Open symbol shows width of wear groove for reference. Width of wear groove as a function of grain size for pure Cu. Sliding distance for all specimens is 1068 m. SEM micrographs on wear groove surfaces of Cu--0.6 vol % SiO 2 composite worn for the sliding distances of (a) 140 and (b) 1620 m. Left and right images are secondary electron image and backscatter compositional image, respectively. Compositional analysis by EDX on wear groove of Cu--0.6 vol % SiO 2 composite worn for the sliding distances of (a) 140 and (b) 1620 m. SEM micrographs on wear groove surfaces of Cu--1.7 vol % SiO 2 composite worn for the sliding distances of (a) 140 and (b) 1620 m. Left and right images are secondary electron image and backscatter compositional image, respectively. Compositional analysis by EDX on wear groove of Cu--1.7 vol % SiO 2 composite worn for the sliding distances of (a) 140 and (b) 1620 m, respectively. (a) Microstructure of the cross section of wear groove for Cu--0.6 vol % SiO 2 composite worn for 270 m. (b) Variation of the maximum thickness of the wear-induced layer as a function of the sliding distance. Hardness distributions of Cu--SiO 2 composites worn for (a) 140 and (b) 1620 m as a function of the distance from worn surface. Vickers hardness of Cu--SiO 2 composites at depth of 15 μm from worn surface as a function of the sliding distance.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.51.01AK01