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

TaC增强Co-Re基合金蠕变载荷下的颗粒强化机制研究

• 批准号: 423515565
• 负责人: Professor Dr. Joachim Rösler
• 金额: --
• 依托单位: MPA Stuttgart, Otto-Graf-Institut (FMPA)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/423515565?language=en
• 关键词: Investigation; particle; strengthening; mechanism; under

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.

研究的目的是从根本上阐明Co-Re基合金中TaC析出物的高温强化机制，并研究其高温应用的强化潜力。这也包括TAC在多大程度上是最佳的，或者其他一种碳化物是否可以实现更高的强化效果的问题。为了回答这些问题，需要在实验和建模之间进行密切的互动。在实验方面，用透射电子显微镜研究蠕变行为和阐明颗粒-位错相互作用尤为重要。模拟的任务特别是从理论上分析粒子-位错相互作用，从而对剥离应力进行预测。同时，研究了碳化物颗粒与基体之间的失配对颗粒位错相互作用的影响，并确定了TaC或其他一元碳化物的强化效果是否最佳。这些研究结合了理论和实验方法，不仅扩展了对高温下颗粒与位错相互作用的基本认识，而且为进一步优化新的Co-Re基高温合金群创造了条件。