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The cyclic deformation behavior of a near-eutectic Al-Si piston alloy with a variety of alloying elements is investigated.Due to the distinctive microstructure,the alloy exhibited various cyclic deformation characteristics at different temperatures.Unique double-stage cyclic hardening occurred at room temperature,while the first hardening was mainly caused by the interaction between the dislocations and the finely dispersive precipitates,and the dislocation/dislocation interaction resulted in the second hardening.At elevated temperatures(200℃ and 350℃),the alloy mainly presented cyclic softening because of the fact that the thermally activated dislocations could bypass or shear the obstructive precipitates.
The cyclic deformation behavior of a near-eutectic Al-Si piston alloy with a variety of alloying elements is investigated. Due to the distinctive microstructure, the alloy exhibiting various cyclic deformation characteristics at different temperatures. , while the first hardening was mainly caused by the interaction between the dislocations and the finely dispersive precipitates, and the dislocation / dislocation interaction resulted in the second hardening. At elevated temperatures (200 ° C and 350 ° C), the alloy mainly presented cyclic softening due of the fact that the thermally activated dislocations could bypass or shear the obstructive precipitates.