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arXiv 0904.0442cond-mat.mtrl-sciphysics.comp-ph
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多晶体中微结构相关的局部应变行为的原位扫描电子显微镜拉伸实验

Microstructure-dependent local strain behavior in polycrystals through in situ scanning electron microscope tensile experiments

M. A. Tschopp, B. B. Bartha, W. J. Porter, P. T. Murray, S. B. Fairchild

摘要:

利用激光烧蚀多晶金属(镍基高温合金Rene 88 DT)表面铂纳米颗粒的数字图像相关技术,获得了室温下原位扫描电子显微镜拉伸实验的局部应变行为。通过将此信息与EBSD的晶体学取向融合,随后的分析表明,平均最大剪切应变倾向于随着施密德因子的增加而增加。此外,最大剪切应变的极端值范围也在靠近晶界处增加,这意味着在多晶Rene 88 DT中,在刚刚超过屈服的应变下,晶界和三重结会积累塑性。原位实验阐明这种类型的微观结构-性能关系对于理解高温下多晶金属中的损伤成核可能是重要的。

英文摘要:

Digital image correlation of laser-ablated platinum nanoparticles on the surface of a polycrystalline metal (nickel-based superalloy Rene 88DT) was used to obtain the local strain behavior from an in situ scanning electron microscope tensile experiment at room temperature. By fusing this information with crystallographic orientations from EBSD, a subsequent analysis shows that the average maximum shear strain tends to increase with increasing Schmid factor. Additionally, the range of the extreme values for the maximum shear strain also increases closer to the grain boundary, signifying that grain boundaries and triple junctions accumulate plasticity at strains just beyond yield in polycrystalline Rene 88DT. In situ experiments illuminating microstructure-property relationships of this ilk may be important for understanding damage nucleation in polycrystalline metals at high temperatures.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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