Influence of Ag addition on the microstructure and properties of copper-alumina composites prepared by internal oxidation
Artikel i vetenskaplig tidskrift, 2017

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.

Electrical conductivity

Microstructures

Internal oxidation

Copper-based composites

Properties

Författare

Xiyi Zhou

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

D. Q. Yi

Central South University

Lars Nyborg

Chalmers, Material- och tillverkningsteknik

Z. Hu

Central South University

J. Huang

Central South University

Yu Cao

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Journal of Alloys and Compounds

0925-8388 (ISSN)

Vol. 722 962-969

Ämneskategorier

Materialkemi

DOI

10.1016/j.jallcom.2017.06.176