Influence of Ag addition on the microstructure and properties of copper-alumina composites prepared by internal oxidation

Zhou, Xiyi,1991Chalmers tekniska högskola,Chalmers University of Technology (författare)

In present study, Cu-Al2O3 composites with both higher micro-hardness and electrical conductivity were fabricated by internal-oxidizing Cu-Al and Cu-Al-Ag sheets at 950 degrees C for 2 h. A small amount of Ag was doped as additives with atomic ratio of Ag/Al ranging from 0 to 0.25. Effects of Ag addition on microstructures, electrical conductivity and micro-hardness were investigated. Results show that the morphology and size distribution of Al2O3 in internal-oxidized Cu-Al alloys were highly sensitive to Ag addition. The size of Al2O3 precipitates decreased from similar to 63 nm to similar to 37 nm when increasing Ag content. Moreover, a large number of triangular Al2O3 precipitate with similar size was observed by field emission scanning electron microscope (FESEM) and high-resolution transmission electron microscopy (HRTEM) in Ag-doped Cu-Al2O3 composites. The orientation relationship between triangular Al2O3 and Cu matrix was [112](Cu)//[110](Al2O3), (11 (1) over bar)(Cu)//(002)(Al2O3) and (2 (2) over bar 0)(Cu)//(2 (2) over bar 0)(Al2O3). Increasing the amount of Ag enhances the electrical conductivity and mechanical strength simultaneously. The optimal electrical and mechanical properties which were 85.9% IACS and 162 HV respectively, were obtained when atomic ratio of Ag/Al was similar to 1: 4 in internal-oxidized Cu- Al2O3-Ag alloy.

Yi, D. Q.Central South University (författare)
Nyborg, Lars,1958Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)nyborg (författare)
Hu, Z.Central South University (författare)
Huang, J.Central South University (författare)
Cao, Yu,1969Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)yucao (författare)
Chalmers tekniska högskolaCentral South University (creator_code:org_t)

Av författaren/redakt...: Zhou, Xiyi, 1991; Yi, D. Q.; Nyborg, Lars, 19 ...; Hu, Z.; Huang, J.; Cao, Yu, 1969

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