| 摘 要： | The cyclic deformation behavior of a near-eutectic Al–Si piston alloy with a variety ofalloying elements is investigated. Due to the distinctive microstructure, the alloy exhibited variouscyclic deformation characteristics at different temperatures. Unique double-stage cyclic hardeningoccurred at room temperature, while the first hardening was mainly caused by the interactionbetween the dislocations and the finely dispersive precipitates, and the dislocation/dislocationinteraction resulted in the second hardening. At elevated temperatures (200 1C and 350 1C), thealloy mainly presented cyclic softening because of the fact that the thermally activated dislocationscould bypass or shear the obstructive precipitates.
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