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Effect of directional solidification rate on the microstructure and properties of deformation-processed Cu-7Cr-0.1Ag in situ composites

Journal Article


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Abstract


  • The influence of directional solidification rate on the microstructure, mechanical properties and conductivity of deformation-processed Cu-7Cr-0.1Ag in situ composites produced by thermo-mechanical processing was systematically investigated. The microstructure was analyzed by optical microscopy and scanning electronic microscopy. The mechanical properties and conductivity were evaluated by tensile-testing machine and micro-ohmmeter, respectively. The results indicate that the size, shape and distribution of second-phase Cr grains are significantly different in the Cu-7Cr-0.1Ag alloys with different growth rates. At a growth rate of 200 μm s-1, the Cr grains transform into fine Cr fiber-like grains parallel to the pulling direction from the Cr dendrites. The tensile strength of the Cu-7Cr-0.1Ag in situ composites from the directional solidification (DS) alloys is significantly higher than that from the as-cast alloy, while the conductivity of the in situ composites from the DS alloys is slightly lower than that from the as-cast alloy. The following combinations of tensile strength, elongation to fracture and conductivity of the Cu-7Cr-0.1Ag in situ composites from the DS alloy with a growth rate of 200 μm s-1 and a cumulative cold deformation strain of 8 after isochronic aging treatment for 1 h can be obtained respectively as: (i) 1067 MPa, 2.9% and 74.9% IACS; or (ii) 1018 MPa, 3.0%, and 76.0% IACS or (iii) 906 MPa, 3.3% and 77.6% IACS.

Authors


  •   Liu, Keming (external author)
  •   Jiang, Zhengyi
  •   Zhao, Jingwei
  •   Zou, Jin (external author)
  •   Chen, Zhibao (external author)
  •   Lu, Deping (external author)

Publication Date


  • 2014

Citation


  • Liu, K., Jiang, Z., Zhao, J., Zou, J., Chen, Z. & Lu, D. (2014). Effect of directional solidification rate on the microstructure and properties of deformation-processed Cu-7Cr-0.1Ag in situ composites. Journal of Alloys and Compounds, 612 221-226.

Scopus Eid


  • 2-s2.0-84903210617

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3975&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2966

Number Of Pages


  • 5

Start Page


  • 221

End Page


  • 226

Volume


  • 612

Abstract


  • The influence of directional solidification rate on the microstructure, mechanical properties and conductivity of deformation-processed Cu-7Cr-0.1Ag in situ composites produced by thermo-mechanical processing was systematically investigated. The microstructure was analyzed by optical microscopy and scanning electronic microscopy. The mechanical properties and conductivity were evaluated by tensile-testing machine and micro-ohmmeter, respectively. The results indicate that the size, shape and distribution of second-phase Cr grains are significantly different in the Cu-7Cr-0.1Ag alloys with different growth rates. At a growth rate of 200 μm s-1, the Cr grains transform into fine Cr fiber-like grains parallel to the pulling direction from the Cr dendrites. The tensile strength of the Cu-7Cr-0.1Ag in situ composites from the directional solidification (DS) alloys is significantly higher than that from the as-cast alloy, while the conductivity of the in situ composites from the DS alloys is slightly lower than that from the as-cast alloy. The following combinations of tensile strength, elongation to fracture and conductivity of the Cu-7Cr-0.1Ag in situ composites from the DS alloy with a growth rate of 200 μm s-1 and a cumulative cold deformation strain of 8 after isochronic aging treatment for 1 h can be obtained respectively as: (i) 1067 MPa, 2.9% and 74.9% IACS; or (ii) 1018 MPa, 3.0%, and 76.0% IACS or (iii) 906 MPa, 3.3% and 77.6% IACS.

Authors


  •   Liu, Keming (external author)
  •   Jiang, Zhengyi
  •   Zhao, Jingwei
  •   Zou, Jin (external author)
  •   Chen, Zhibao (external author)
  •   Lu, Deping (external author)

Publication Date


  • 2014

Citation


  • Liu, K., Jiang, Z., Zhao, J., Zou, J., Chen, Z. & Lu, D. (2014). Effect of directional solidification rate on the microstructure and properties of deformation-processed Cu-7Cr-0.1Ag in situ composites. Journal of Alloys and Compounds, 612 221-226.

Scopus Eid


  • 2-s2.0-84903210617

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3975&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2966

Number Of Pages


  • 5

Start Page


  • 221

End Page


  • 226

Volume


  • 612