WANG En-rui, HUI Xi-dong, WANG Jian-guo, GU Feng-long. Effects of precipitates on the fracture behavior of cast eutectic Al-Si alloys[J]. Chinese Journal of Engineering, 2011, 33(12): 1508-1515. DOI: 10.13374/j.issn1001-053x.2011.12.012
Citation: WANG En-rui, HUI Xi-dong, WANG Jian-guo, GU Feng-long. Effects of precipitates on the fracture behavior of cast eutectic Al-Si alloys[J]. Chinese Journal of Engineering, 2011, 33(12): 1508-1515. DOI: 10.13374/j.issn1001-053x.2011.12.012

Effects of precipitates on the fracture behavior of cast eutectic Al-Si alloys

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  • Received Date: March 08, 2011
  • Available Online: July 29, 2021
  • The fracture characteristics of precipitates in cast eutectic Al-Si alloys were studied during tensile processes by observing the fracture and precipitates.It is shown that the primary/eutectic Si cracks mainly through transcrystalline fracture owing to structural defects.Primary Si with a diameter size less than 2.0μm can block the propagation of secondary cracks.The blocky iron-rich phases crack through transcrystalline fracture,while cracks within the Chinese script iron-rich phases propagate along their primary dendrites.The copper-rich phases deflect the crack propagation and inhibit the nucleation of microcracks within the iron-rich phases.Increasing the Cu content neutralizes the harmful effects of the iron-rich phases to some extent and is of benefit to the mechanical properties.
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