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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 2    April 2003

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Structures and properties of
deformation-processed Cu-16Fe-2Cr in-situ composites
SUN Shi-qing(孙世清)1, 2, MAO Lei(毛 磊)1,
GUO Zhi-meng(郭志猛)2 ,YIN Sheng(殷 声)2

1. School of Materials Science and Engineering, 
Hebei University of Science and Technology, Shijiazhuang 050054, China;
2. School of Materials Science and Engineering, 
University of Science and Technology Beijing, Beijing 100083, China

Abstract:Microstructure and properties of deformation-processed Cu-16Fe-2Cr and Cu-18Fe in-situ composite wires obtained by cold drawing combined with intermediate annealing were investigated. At lower strains(η<2.52), most of the Fe(Cr) phases were elongated into filaments except some remain granular because of their higher hardness. The ultimate tensile strengths of Cu-16Fe-2Cr and Cu-18Fe are approximately equal at the same drawing strains, suggesting the increase of strength of Cu-16Fe-2Cr due to higher strength of Fe(Cr) filaments than that of Fe filaments which is counteracted by the somewhat coarse Fe(Cr) filaments in Cu-16Fe-2Cr at the same drawing strains. The increase of the electrical conductivity of Cu-16Fe-2Cr and Cu-18Fe after intermediate annealing is attributed to the precipitation of Fe, Cr atoms, which dissolved during melting processing. Electrical conductivity of the Cu-16Fe-2Cr in-situ composites is higher than Cu-18Fe in-situ composites at the same drawing strains. The addition of Cr to Cu-Fe system can increase mechanical stability of the filaments in the composites.

 

Key words:  in-situ composite; deformation processing; intermediate annealing; electrical conductivity; strength

ISSN 1672-7029
CN 43-1423/U

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