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Relationship between secondary twins and pyramidal dislocations in a Mg-3Al-1Zn alloy during high cycle fatigue deformation
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College of Materials Science and Engineering,Chongqing University

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    Abstract:

    Typical fracture morphology of Mg-3Al-1Zn alloy after cyclic deformation was investigated using optical microscope (OM), scanning electron microscopy (SEM), transmission Kikuchi diffraction (TKD) and transmission electron microscopy (TEM). Cross-section samples were extracted from secondary twin regions for TEM/TKD observation. The results showed that a large amount of {10-12}-{10-12} secondary twins were observed in the region near the fractured edge. Two-beam bright field (TBBF) technique was performed to study the types of dislocations along secondary twin boundaries. It was found that pyramidal dislocations were highly active within {10-12}-{10-12} secondary twins, which is considered to make pyramidal dislocations have the relationship with {10-12}-{10-12} secondary twins. Localized stress concentration within the secondary twins may lead to the formation of pyramidal dislocations.

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[Li Tan, Xiyan Zhang, Ting Xia, Guangjie Huang, Qing Liu. Relationship between secondary twins and pyramidal dislocations in a Mg-3Al-1Zn alloy during high cycle fatigue deformation[J]. Rare Metal Materials and Engineering,2019,48(5):1435~1439.]
DOI:10.12442/j. issn.1002-185X. E20170200

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History
  • Received:December 11,2017
  • Revised:March 02,2018
  • Adopted:March 12,2018
  • Online: June 04,2019
  • Published: