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A Study of the Microstructural Evolution and Strengthening Effects of Non-Spherical Precipitates in an Al-Cu-Based Alloy
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Mechanical Properties of Cu-4.0wt%Ni-0.95wt%Si Alloys with and without P and Cr Addition
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Specimen-Size Dependence of the Martensitic Transformation Temperature of Yttria Doped Zirconia
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Mechanical Properties of Cu-4.0wt%Ni-0.95wt%Si Alloys with and without P and Cr Addition

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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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Periodical:

Materials Science Forum (Volumes 561-565)

Pages:

2321-2324

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.561-565.2321

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Online since:

October 2007

Authors:

Chihiro Watanabe, Fumiya Nishijima, Ryoichi Monzen, Kazue Tazaki

Keywords:

Age Hardening, Cr Addition, Cu-Ni-Si Alloys, Mechanical Property, P Addition, δ-Ni2Si Precipitate

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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