Metallic materials processing such as rolling, extrusion or forging often involves high‐temperature deformation. Usually under such conditions the samples are characterized post mortem, under pseudo in situ conditions with interrupted tests, or in situ with a limited strain rate. A full in situ 3D characterization, directly during high‐temperature deformation with a prescribed strain‐rate scheme, requires a dedicated sample environment and a dedicated image‐analysis workflow. A specific sample environment has been developed to enable highly controlled (temperature and strain rate) high‐temperature deformation mechanical testing to be conducted while performing in situ tomography on a synchrotron beamline. A dedicated digital volume correlation algorithm is used to estimate the strain field and track pores while the material endures large deformations. The algorithm is particularly suitable for materials with few internal features when the deformation steps between two images are large. An example of an application is provided: a high‐temperature compression test on a porous aluminium alloy with individual pore tracking with a specific strain‐rate scheme representative of rolling conditions.

中文翻译：

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X射线显微断层照相术随后进行高温变形：在大应变下跟踪特征的方法

金属材料的加工（例如轧制，挤压或锻造）通常涉及高温变形。通常在这样的条件下，在验尸后，在假原位条件下用间断测试或在有限应变速率下原位表征样品。要在规定的应变率方案下直接在高温变形过程中进行完整的原位3D表征，需要专用的样品环境和专用的图像分析工作流程。已经开发了一种特定的样品环境，可以在现场进行高度受控的（温度和应变率）高温变形机械测试同步辐射束线上的层析成像。当材料承受大变形时，专用的数字体积相关算法用于估计应变场并跟踪孔。当两个图像之间的变形步长较大时，该算法特别适用于内部特征很少的材​​料。提供了一个应用示例：对多孔铝合金的高温压缩试验，具有独立的气孔跟踪，并具有代表轧制条件的特定应变率方案。