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谭力,张喜燕,夏挺,黄光杰,刘庆.高周疲劳变形中二次孪晶与锥面位错之间的关系[J].稀有金属材料与工程(英文),2019,48(5):1435~1439.[Li Tan,Xiyan Zhang,Ting Xia,Guangjie Huang and 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.]
Relationship between secondary twins and pyramidal dislocations in a Mg-3Al-1Zn alloy during high cycle fatigue deformation
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Received:December 11, 2017  Revised:March 02, 2018
DOI:
Key words: Secondary twins  Pyramidal dislocations  Magnesium  Fatigue
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Li Tan,Xiyan Zhang,Ting Xia,Guangjie Huang and Qing Liu  
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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.