镍单晶原位拉伸试验中单个位错成核激活参数的精确测量

Xiaoqing Li, A. Minor
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引用次数: 6

摘要

位错等晶体缺陷的成核是机械变形的核心问题。在这里,我们展示了一种技术,可以在原位透射电子显微镜(TEM)拉伸测试中观察单个位错的成核,并从单个事件中测量与塑性相关的基本参数。我们的方法依赖于用自动图像分析系统检测取向单晶Ni样品中的位错滑移痕迹。利用原位测试中单个缺陷轨迹的识别,应用累积概率函数来关联位错成核事件与相应应力水平之间的关系。我们的分析允许外推单个位错成核事件的激活参数,使用一个样品在一次拉伸试验中的数据。原位TEM纳米力学测试中位错成核激活参数的精确定量关联可以为塑性计算模型提供直接的定量测量。
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Precise Measurement of Activation Parameters for Individual Dislocation Nucleation During in Situ Tem Tensile Testing of Single Crystal Nickel
Abstract Nucleation of crystalline defects such as dislocations lies at the heart of mechanical deformation. Here, we demonstrate a technique for observing the nucleation of individual dislocations during in situ transmission electron microscopy (TEM) tensile testing and measuring fundamental parameters relevant for plasticity from the individual events. Our method relies on systematic detection of dislocation slip traces with automated image analysis in an oriented single crystal Ni sample. Using the identification of individual defect traces from in situ testing, a cumulative probabilistic function is applied to correlate the relationship between a dislocation nucleation event and the corresponding stress level. Our analysis allows for the extrapolation of the activation parameters for individual dislocation nucleation events using the data on one sample in one tensile test. Precise and quantitative correlation of activation parameters for dislocation nucleation from in situ TEM nanomechanical testing can provide direct quantitative measurements useful for computational models of plasticity.
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