Diffusion-plasticity coupling during selective oxidation of metal alloys

金属合金选择性氧化过程中的扩散塑性耦合

• 批准号: 392017294
• 负责人: Professor Dr. Sergiy Divinski
• 金额: --
• 依托单位: CEA Centre de Saclay
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/392017294?language=en
• 关键词: Diffusion; plasticity; coupling; during; selective

The aim of the project is to study the effect of plastic deformation on bulk and grain boundary diffusion in model binary and ternary Ni-Cr-based alloys (Ni-Cr, Ni-Cr-Fe) in a temperature range including low temperatures where the bulk diffusion cannot be easily measured (350-750 °C). Diffusion coefficients of chromium, nickel and iron will be measured by a combination of two methods to get reliable data: secondary ion mass spectrometry (SIMS) using stable isotopes (France) and the radiotracer technique (Germany). The experiments will be carried out at various temperatures (i) without strain or pre-strain; (ii) on pre-strained samples in order to study the effect of the dislocation network and its evolution during diffusion experiment and, (iii) on specimens during creep to study the influence of dislocation motion. Finally, the measured diffusion coefficients will be integrated in an oxidation kinetics code in order to take into account the effect of plastic deformation in the Cr selective oxidation phenomenon. The following partners will be involved in the project: ARMINES acting through the Centre des Matériaux (CDM) common research centre of ARMINES and MINES ParisTech (coordinator, France), CEA (France) and University of Münster (Germany).

该项目的目的是研究塑性变形对模型二元和三元Ni-Cr基合金（Ni-Cr、Ni-Cr-Fe）在包括体扩散不易测量的低温（350-750 °C）在内的温度范围内的体扩散和晶界扩散的影响。铬、镍和铁的扩散系数将通过以下两种方法的组合来测量，以获得可靠的数据：使用稳定同位素的二次离子质谱法（法国）和放射性示踪剂技术（德国）。实验将在不同温度下进行：（i）无应变或预应变;（ii）预应变样品，以研究扩散实验期间位错网络及其演变的影响;（iii）蠕变期间样品，以研究位错运动的影响。最后，测得的扩散系数将被集成在一个氧化动力学代码，以考虑到在铬选择性氧化现象的塑性变形的效果。下列合作伙伴将参与该项目：ARMINES通过ARMINES和MINES ParisTech（协调员，法国）的材料中心（CDM）共同研究中心开展活动，CEA（法国）和明斯特大学（德国）。