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Volume 5 Issue 5
Oct.  2014
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LI Sanhua, LEI Qian, LI Zhou, ZHANG Liang, WANG Mengying, LIU Huiqun. Micro-structures and properties of ultra-high strength Cu-Ni-Si-Mg-Cr alloy[J]. Nonferrous Metals Science and Engineering, 2014, 5(5): 35-38,78. DOI: 10.13264/j.cnki.ysjskx.2014.05.006
Citation: LI Sanhua, LEI Qian, LI Zhou, ZHANG Liang, WANG Mengying, LIU Huiqun. Micro-structures and properties of ultra-high strength Cu-Ni-Si-Mg-Cr alloy[J]. Nonferrous Metals Science and Engineering, 2014, 5(5): 35-38,78. DOI: 10.13264/j.cnki.ysjskx.2014.05.006
shu

Micro-structures and properties of ultra-high strength Cu-Ni-Si-Mg-Cr alloy

  • 1.

    School of Materials Science and Engineering, Central South University, Changsha 410083, China

  • 2.

    Key Lab of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China

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  • Received Date: June 29, 2014
  • Published Date: October 30, 2014
    Graphical Abstract
    • Abstract
  • Microstructure and properties of the Cu-6.0Ni-1.4Si-0.15Mg-0.1Cr alloy are studied by optical microscope, X-ray diffractometer and transmission electron microscope observation, and by Vickers hardness tester, eddy-current electrical conductivity measurement. Results show that the developed dendrite which can be divided into dendrite area, the middle transition region and non-equilibrium solidification phase particles, appears in the casting ingot. The non-equilibrium solidification phases are δ-Ni2Si and β-Ni3Si. The main strength mechanism for designed alloy is precipitation strengthening and the strengthening phases are δ-Ni2Si. After appropriate thermo-mechanical treatment, the hardness of the alloy can be 353 HV, tensile strength can reach 1 010 MPa, and yield strength is 930 MPa with enlogation being 3.8% and electrical conductivity being 29.7% IACS.
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    • References (16)
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