Investigation of the particle strengthening mechanism under creep loading of TaC-reinforced Co-Re base alloys

该研究提案的目的是从根本上阐明Co-Re基合金中TaC沉淀物在高温下的强化机制，并研究其在高温应用中的强化潜力。这也包括TaC在多大程度上是最佳的问题，或者是否可以通过其他一碳化物实现更高的强化效果。为了回答这些问题，需要实验和建模之间的密切互动。在实验方面，通过透射电子显微镜研究蠕变行为和阐明颗粒-位错相互作用是特别重要的。建模的任务特别是从理论上分析颗粒-位错相互作用，从而预测剥离应力。同样，要检查碳化物颗粒和基体之间的失配对颗粒-位错相互作用的影响，并确定TaC或其他一碳化物是否具有最佳强化效果。这些研究将联合收割机的理论和实验方法相结合，不仅可以扩展对高温下颗粒与位错相互作用的基本认识，而且可以为进一步优化新型Co-Re基高温合金创造条件。

The aim of the research proposal is to fundamentally elucidate the strengthening mechanism of TaC precipitates in Co-Re base alloys at high temperatures and to investigate their strengthening potential for elevated temperature applications. This also includes the question as to what extent TaC is optimal or whether a higher strengthening effect can be realized by other monocarbides. In order to answer these questions, a close interaction between experiment and modeling is required. On the experimental side, it is particularly important to investigate the creep behavior and to elucidate the particle-dislocation interaction by transmission electron microscopy. The task of the modeling is in particular to theoretically analyze the particle-dislocation interaction and thus to make predictions for the detachment stress. Likewise, the influence of the mismatch between carbide particles and matrix on the particle-dislocation interaction is to be examined and it is to be determined whether TaC or other monocarbides give an optimum strengthening effect. These investigations, which combine theoretical and experimental methods, should not only expand the basic understanding of the interaction between particles and dislocations at elevated temperatures, but also create the conditions for further optimizing the new group of Co-Re-based high-temperature alloys.