Journal of Materials Engineering and Performance

, Volume 22, Issue 12, pp 3834–3839 | Cite as

Effect of Fatigue Behavior on Microstructural Features in a Cast Al-12Si-CuNiMg Alloy Under High Cycle Fatigue Loading

  • Jinxiang Liu
  • Qing Zhang
  • Zhengxing Zuo
  • Yi Xiong


High cycle fatigue tests of a cast Al-12Si-CuNiMg alloy are carried out under different stress amplitudes at room temperature. The scanning and transmission electron microscopy observations are used to examine the fracture surfaces and dislocation structures of the tested material, respectively. The results show that the fatigue damage originates from the microstructural defects, and the fracture surface morphology is typical quasi-cleavage fracture. With the increasing strain amplitude, the material fatigue life obviously decreases; however, the dislocation density increases significantly, which leads to the formation of the dislocation walls and cells. Under the cycle loading, the eutectic Si phase and the secondary particles undergo fracture. The pinning effect of the precipitates on the dislocations becomes obvious, indicating that the Al-12Si-CuNiMg alloy has the cyclic hardening characteristic.


Al-12Si-CuNiMg alloy dislocation high cycle fatigue microstructure stress amplitude 



The current study is based on the research supported by the National Natural Science Foundation of China (Grant No. 51005020).


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Copyright information

© ASM International 2013

Authors and Affiliations

  • Jinxiang Liu
    • 1
  • Qing Zhang
    • 1
  • Zhengxing Zuo
    • 1
  • Yi Xiong
    • 2
  1. 1.School of Mechanical EngineeringBeijing Institute of TechnologyBeijingChina
  2. 2.School of Materials Science and EngineeringHenan University of Science and TechnologyLuoyangChina

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