Abstract
Electron microscopic research results are given for the Al-2.9% Cu-2.2% Mg-0.6% Mn alloy structure after different operating times corresponding to cyclic hardening or cyclic softening. It is shown that cyclic hardening results in precipitation of S′ particles and cyclic softening results in three processes: dissolution of S′ particles, precipitation of S″ particles instead of S′ ones and/or formation of regions free from precipitates. The main fatigue crack passes through cyclic-hardened material only and the hardening phase is merely the S′ particles. Relations between structure, cyclic hardening, cyclic softening and accumulated cyclic deformation are observed.
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