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,2019,48(5):1435~1439.[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.]
高周疲劳变形中二次孪晶与锥面位错之间的关系
投稿时间:2017-12-11  修订日期:2018-03-02
中文关键词:  二次孪晶  锥面位  镁合金  疲劳
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      本文采用金相显微镜(OM),扫描电镜(SEM),透射菊池衍射(TKD)和透射电子显微镜(TEM)表征技术,研究了高周疲劳变形后的Mg-3Al-1Zn镁合金的典型断口组织特征,二次孪晶内部的横切面区域被提取出来进行TEM和TKD观察。结果显示断口边缘附近的区域有大量的{10-12}-{10-12}二次孪晶,双束明场技术(TBBF)应用于研究二次孪晶边界的位错类型。研究发现锥面位错在{10-12}-{10-12} 二次孪晶内部被大量的激活,这被认为锥面位错与二次孪晶有关联。二次孪晶内部的局部应力集中将导致锥面位错的形成。
Relationship between secondary twins and pyramidal dislocations in a Mg-3Al-1Zn alloy during high cycle fatigue deformation
英文关键词:Secondary twins  Pyramidal dislocations  Magnesium  Fatigue
英文摘要:
      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.
作者单位E-mail
谭力 材料科学与工程学院 187178457@qq.com 
张喜燕 材料科学与工程学院  
夏挺 材料科学与工程学院  
黄光杰 材料科学与工程学院  
刘庆 材料科学与工程学院  
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