Mechanism study of grain evolution during isothermal heating using in-situ electron backscatter diffraction

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-04-25 DOI:10.1016/j.vacuum.2025.114370

Sen Liu, Guanghao Guo, Xianjue Ye, Yuefei Zhang, Ze Zhang

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Abstract

To investigate the grain growth and mechanisms of polycrystalline materials at high temperatures, this study designed an in-situ heating experiment using electron backscatter diffraction (EBSD) at 750 °C, successfully characterizing the continuous grain evolution. A substantial amount of ex-situ experimental results indicated that the growth of polycrystalline grains is generally constrained by the topology of grain boundaries. When the number of grain boundaries is less than 6, grains tend to be consumed by surrounding grains; conversely, when the number of grain boundaries is equal to or greater than 6, grains typically continue to grow. However, the present results from the in-situ characterization revealed that grain growth during annealing does not strictly adhere to topological constraints. Furthermore, the movement of boundaries were affected by the anisotropy of grain boundary and the study found that when grain boundaries with a <111> rotation axis, their migration activity is significantly enhanced.

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利用原位电子背散射衍射研究等温加热过程中晶粒演化的机理

为了研究多晶材料在高温下的晶粒生长及其机制，本研究设计了一种在750℃下的原位加热实验，利用电子背散射衍射（EBSD）成功表征了晶粒的连续演变。大量的非原位实验结果表明，多晶晶粒的生长通常受到晶界拓扑结构的限制。当晶界数小于6时，晶粒倾向于被周围晶粒消耗；相反，当晶界数等于或大于6时，晶粒通常会继续生长。然而，目前的原位表征结果表明，退火过程中的晶粒生长并不严格遵守拓扑约束。此外，晶界的各向异性也会影响晶界的移动，研究发现，当晶界具有<；111>；旋转轴时，其迁移活性明显增强。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.