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抗氢合金J75中低∑CSL晶界的形成与演化
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中科院金属研究所

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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)


Formation and Evolution of Low ∑CSL Grain Boundaries in J75 Hydrogen-Resistant Alloy
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    摘要:

    以铁镍基抗氢合金J75为研究对象,采用单步形变热处理和电子背散射衍射(EBSD)技术,研究了低∑CSL晶界的形成和演化过程。结果表明:采用5%预变形+1000℃退火的单步形变热处理方法,可将J75合金中低∑CSL晶界的比例提升至70%以上,形成具有∑3n取向关系的晶粒团簇;退火过程中,低∑CSL晶界比例的提升主要是由于∑3n界面比例的提升,其中∑3占绝大比例。发现一种∑3再生过程,其机制在于:由于∑3ic迁移能力强,在退火过程中与其他∑3相遇会形成∑9晶界,而∑9与∑3相遇,倾向于发生∑9+∑3→∑3,导致∑3的再生;R晶界与低∑CSL晶界相遇会形成R/∑晶界,当R/∑晶界为低∑CSL晶界时,则构成较多具有低∑CSL晶界的网络,打断了R晶界的连通性。

    Abstract:

    The research in the area of grain boundary engineering was mainly focused on the relationship between process, microstructure and properities. However, little attention has been paid to the formation and evolution process of low ∑CSL grain boundary. To better understand the dynamic process, electron backscatter diffraction (EBSD) was used to analyse the grain boundary migration and evolution in J75 alloy. Single-step deformation heat treatment with 5% pre-deformation and 1000 °C annealing was used to increase the proportion of low-∑CSL grain boundary to over 70%, and formed grain clusters with ∑3n orientation relationship to break the connectivity of random grain boundaries. During the annealing process, the migration ability of ∑3ic grain boundary is strong, and when it encounters other ∑3, ∑9 would be formed; In addition, ∑3 with ∑9 would lead to∑3+∑9→ ∑27 or ∑9+∑3→∑3 processes, and the latter was more likely to occur. The ∑3 regeneration was closely related to the ∑3ic grain boundary; A mechanism for breaking the connectivity of random grain boundary network was proposed. When random boundary met low ∑CSL grain boundary, R/∑ grain boundary would form. If the ratio (R/∑)≤29, the connectivity of random grain boundary network could be interrupted.

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胡红磊,赵明久.抗氢合金J75中低∑CSL晶界的形成与演化[J].稀有金属材料与工程,2020,49(1):131~137.[huhonglei, zhaomingjiu. Formation and Evolution of Low ∑CSL Grain Boundaries in J75 Hydrogen-Resistant Alloy[J]. Rare Metal Materials and Engineering,2020,49(1):131~137.]
DOI:10.12442/j. issn.1002-185X.20181090

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  • 收稿日期:2018-10-26
  • 最后修改日期:2018-11-12
  • 录用日期:2018-12-05
  • 在线发布日期: 2020-02-16
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