Abstract
Changes in electrical resistivity of age-hardenable Cu-Ti alloys containing approximately up to 3%Ti and furnace-cooled from 800°C were measured at room temperature and in the temperature range from room temperature up to 870°C with the constant heating rate of 3.7°C/min.
(1) The room-temperature resistivity increased with increasing Ti composition in general, but those of the alloys containing about 1%Ti were anomalously higher than those of the other composition.
(2) At a constant rate of heating, a clear decrease of resistivity in the temperature range between 380°C and 500°C was observed in the alloys containing approximately 1%Ti, but it was no longer observed in the alloys containing more than 1.2%Ti.
These phenomena mean that the rate of precipitation during furnace-cooling is anomalously slow only in the alloys containing approximately 1%Ti.
(3) In Cu-0.54%Cr-Ti alloys cooled from 800°C in the furnace, the same anomalous behavior of electrical resistivity as that of Cu-Ti alloys was also observed at the composition of about 1%Ti.
