Unique cyclic deformation behavior of a heavily alloyed Al-Si piston alloy at different temperatures

作者：Zhang, Guohua; Li, Bingchao; Zhang, Jianxin; Feng, Zengjian; Wei, Zuoshan; Cai, Wei^*

来源：Progress in Natural Science:Materials International , 2012, 22(5): 445-451.

DOI：10.1016/j.pnsc.2012.10.002

• Aluminum alloy
• Cyclic deformation
• Fatigue
• Intermetallics
• Dislocations

The cyclic deformation behavior of a near-eutectic AlSi 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 degrees C and 350 degrees C), the alloy mainly presented cyclic softening because of the fact that the thermally activated dislocations could bypass or shear the obstructive precipitates.

• 出版日期2012-10
• 单位山东大学; 哈尔滨工业大学