Mechanical Properties of Cu-4.0wt%Ni-0.95wt%Si Alloys with and without P and Cr Addition
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by
Chihiro Watanabe, Fumiya Nishijima, Ryoichi Monzen, Kazue Tazaki
Abstract
The effects of P and Cr addition and two-step aging on the microstructure and mechanical
properties of a Cu-4wt%Ni-0.95wt%Si alloy have been examined. The addition of 0.02wt%P
improves both strength and elongation because it suppresses discontinuous precipitation reaction. The
Cr addition to the Cu-Ni-Si-P alloy decreases greatly the grain size, resulting in an increase in
elongation. Two-step aging, pre-aging at 300 or 350oC and subsequent second-step aging at 450oC,
causes an increase in strength without reducing elongation. The increase in strength is attributable to
the decrease in inter-precipitate spacing by the two-step aging. The two-step aged Cu-4wt%Ni-
0.95wt%Si-0.02wt%P-0.02wt%Cr alloy attains a tensile strength of 830MPa, an elongation of 13%
and an electrical conductivity of 35%IACS.
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Year 2007
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