Bachmaier A, Aboulfadl H, Pfaff M, Mücklich F, Motz C
Chair of Materials Science and Methods, Saarland University, Saarbrücken, Germany.
Chair of Functional Materials, Saarland University, Saarbrücken, Germany.
Mater Charact. 2015 Feb;100:178-191. doi: 10.1016/j.matchar.2014.12.022.
A Cu-Co composite material is chosen as a model system to study structural evolution and phase formations during severe plastic deformation. The evolving microstructures as a function of the applied strain were characterized at the micro-, nano-, and atomic scale-levels by combining scanning electron microscopy and transmission electron microscopy including energy-filtered transmission electron microscopy and electron energy-loss spectroscopy. The amount of intermixing between the two phases at different strains was examined at the atomic scale using atom probe tomography as complimentary method. It is shown that Co particles are dissolved in the Cu matrix during severe plastic deformation to a remarkable extent and their size, number, and volume fraction were quantitatively determined during the deformation process. From the results, it can be concluded that supersaturated solid solutions up to 26 at.% Co in a Cu-26 at.% Co alloy are obtained during deformation. However, the distribution of Co was found to be inhomogeneous even at the highest degree of investigated strain.
选择一种铜钴复合材料作为模型体系，以研究严重塑性变形过程中的结构演变和相形成。通过结合扫描电子显微镜和透射电子显微镜（包括能量过滤透射电子显微镜和电子能量损失谱），在微观、纳米和原子尺度上表征了作为施加应变函数的演化微观结构。使用原子探针断层扫描作为补充方法，在原子尺度上检查了不同应变下两相之间的混合量。结果表明，在严重塑性变形过程中，钴颗粒在很大程度上溶解在铜基体中，并且在变形过程中对其尺寸、数量和体积分数进行了定量测定。从结果可以得出结论，在变形过程中，在Cu-26 at.% Co合金中获得了高达26 at.% Co的过饱和固溶体。然而，即使在研究的最高应变程度下，也发现钴的分布是不均匀的。
