Abstract
Changes of internal friction at low frequencies during isothermal ageing at 73°C of Al-4 wt.% copper wires are interpreted in terms of a migrating internal friction peak due to stress-induced ordering of copper atoms. If the vacancy decay follows a second order rate curve, it is deduced that the relaxation time τ will vary with ageing time t as τ = τ a + βt. Where β is a constant and τ a is the as-quenched value of τ. This relation fits the 73°C data fairly well but the deduced value of τ a exceeds that expected from resistivity data on pure aluminium by two orders of magnitude, which may be explained by inefficient quenching. The existence of interaction between indium atoms and vacancies is deduced from preliminary experiments in which indium addition to an Al-4 wt.% copper alloy modifies the decrement time curve following quenching.
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