The electrical conductivity of Cu-P based sheet alloys tended to decease with increase of the total amount of final cold rolling, while alloy tensile strength proportionally increased. When the cold rolling was carried out at an extremely low temperature, the tensile strength was more remarkably increased, even though the degree of reduced conductivity was generally similar to that found in the ordinary cold rolling process. It is well known that strain hardening reduces the electrical conductivity of pure Cu and Cu alloys; however, in this work it is reported that the degree of reduction is apparently larger than previously thought. TEM analysis revealed that various fine P-containing precipitates were formed in the experimental alloys. The unstable interface between the coarse P-containing precipitates and the Cu matrix is postulated to be responsible for the significant drop of conductivity.
The age hardening response and corrosion resistance of Mg-8%Gd-2%Nd-0.3%Zr alloys with various Zn contents up to 2% (in weight) have been investigated. The Zn-free alloy exhibits relatively lower age hardening and slower age response, whereas the addition of Zn enhances the age hardening response remarkably. The weight loss after salt spray test decreases with increasing Zn content in the peak-aged alloys, which is presumably associated with the increased amount of eutectic Mg-Zn-Nd-Gd phase acting as a corrosion barrier along the grain boundaries. The potentiodynamic polarization curves reveal that with the increase in Zn content, the value of I corr decreases gradually while the value of E corr increases.
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