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Zr-Cr-Fe合金马氏体相变过程中三变体团簇的择优形成及其晶体学分析
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1.材料科学与工程学院;2.北卡罗来纳州立大学

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国家自然科学基金项目(面上项目,重点项目,重大项目)


The preferred formation and crystallographic analysis of three-variant cluster in Zr-Cr-Fe alloy during martensitic transformation
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College of Materials Science and Engineering,Chongqing University

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    摘要:

    采用ECC, TEM和EBSD表征技术,研究了Zr-Cr-Fe合金经β相淬火后的马氏体组织特征。结果表明:马氏体相变过程中,任一高温β相都能够转变为12个α马氏体变体。而这12个α马氏体变体并不是随机分布的,而是择优形成了四个亚区域。每一个亚区域由一种三变体团簇组成,而该三变体团簇表现为典型的三角形自我协调形貌。进一步晶体学分析表明:组成每一个团簇的这三个马氏体变体与母相之间存在一个共同的 极点,同时该三变体相互之间的取向关系为 。由于在β→α马氏体相变过程中存在形状应变,而三变体团簇的形成能够最大程度的协调该应变。

    Abstract:

    The martensitic microstructure of Zr-Cr-Fe alloy after β-quenching are investigated by a combination of electron channeling contrast imaging (ECC), transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) techniques. All of theoretical 12 α variants inherited from one single β phase have been obtained in the current study that revealed strict Burgers orientation relationship (BOR) with respect to β parent phase. The entire martensitic microstructure consisting of these 12 α variants in the as-quenched Zr-Cr-Fe alloy can be divided into four sub-regions or morphological groups. Each sub-region, in turn, is dominated by only one type of three-variant cluster (one crystallographic group composed of three α variants) showing the self-accommodation triangular morphologies. These three variants from individual cluster share a common pole of β parent phase and are related to each other by an angle/axis pair . The preferred formation of such three-variant cluster is ascribed to the elastic interaction between variants to achieve the largest degree of self-accommodation.

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王建民,梁御阳,邱日盛,栾佰峰,Murty K L,刘庆. Zr-Cr-Fe合金马氏体相变过程中三变体团簇的择优形成及其晶体学分析[J].稀有金属材料与工程,2019,48(2):426~432.[Wang Jianmin, Liang Yuyang, Qiu Risheng, Luan Baifeng, Murty Korukonda L, Liu Qing. The preferred formation and crystallographic analysis of three-variant cluster in Zr-Cr-Fe alloy during martensitic transformation[J]. Rare Metal Materials and Engineering,2019,48(2):426~432.]
DOI:10.12442/j. issn.1002-185X.20170671

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  • 收稿日期:2017-07-31
  • 最后修改日期:2017-09-04
  • 录用日期:2017-09-12
  • 在线发布日期: 2019-03-15
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