Abstract
Different kinds of Al and Al alloys are used for all bare overhead energy transmission lines. In the present work, the effect of heat treatments on the conductivity of Al-0.25wt.%Zr alloy has been investigated. Al-0.25wt.%Zr samples were prepared in cold graphite crucibles by using a vacuum furnace and a continuous casting line. The samples were aged isothermally and isochronally in muffle and tube furnaces. Aging was carried out at a wide range of temperatures (350-600 °C) at constant aging times (75 h, 100 h) and a wide range of aging times (25-500 h) at constant temperatures (425 °C, 450 °C). According to the experimental results, conductivities of aged samples increase up to a certain aging temperature and aging time and reach peak values, then decrease with increasing aging temperature and aging time.
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