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首页> 外文期刊>Materials Science and Engineering >In-situ TEM study of crack propagation in crystal thinning area and crystal rotation at crack tip in Al
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In-situ TEM study of crack propagation in crystal thinning area and crystal rotation at crack tip in Al

机译：浅谈晶体稀薄区域裂纹传播的原位TEM研究及裂纹尖端晶体旋转

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摘要

In-situ tension test in a transmission electron microscope (TEM) was used to study the fracture process of aluminium, as well as the real-time crack formation process and atomic-scale results of crack tip propagation were captured. The experimental results show that multiple Frank-Read dislocation sources are formed in the crystal thinning area at the front of the crack, and the nanocrack nucleates on the dislocation loops emitted by the dislocation source. The perfect dislocations that were continuously emitted from the crack tip slip and decompose in the crystal, resulting in the relative rotation of the crystal to form a twin boundary. After the perfect dislocation decomposition, a part of the residual dislocation formed a dislocation wall at the twin boundary to form a subgrain boundary, and the other part formed a stacking fault, and then the residual dislocation dragged the stacking fault to slip at the twin boundary.
机译：在透射电子显微镜（TEM）中的原位张力试验用于研究铝的断裂过程，以及捕获裂纹尖端传播的实时裂缝形成过程和原子级结果。 实验结果表明，多个坦率读取的位错源形成在裂缝前面的晶体稀释区域中，并且纳克拉克在错位源发射的位错环上成核。 从裂纹尖端滑动和分解在晶体中的完美位错，导致晶体的相对旋转形成双边界。 在完美的错位分解之后，残留位错的一部分在双边界处形成了位错壁以形成子粒边界，另一部分形成了堆叠故障，然后剩余位错拖动堆叠故障在双边界处滑动以滑动堆叠故障 。

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  • 来源
    《Materials Science and Engineering》 |2021年第8期|141800.1-141800.6|共6页
  • 作者

    Rang Yan; Zhongwei Chen; Wenjie Lu; Yanni Zhao; Wei Le; YanQing Xue; Sufyan Naseem; Ali Wafaa;

  • 作者单位

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 Shaanxi China Langu Institute for Materials Analysis Co. Ltd Weihai 264207 Shandong China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 Shaanxi China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 Shaanxi China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 Shaanxi China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 Shaanxi China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 Shaanxi China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 Shaanxi China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 Shaanxi China;

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  • 正文语种 eng
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  • 关键词

    In-situ TEM; Frank-read dislocation sources; Dislocation loops; Crack; Stacking fault;

    机译：原位TEM;坦率阅读错位来源;错位环;裂缝;堆叠故障;

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