Method for determining diffusion data in ternary and multicomponent alloys
三元和多元合金中扩散数据的测定方法
基本信息
- 批准号:314517859
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2016
- 资助国家:德国
- 起止时间:2015-12-31 至 2019-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In the proposed project a novel method will be elaborated that allows determining atomic mobilities in multicomponent alloys including their temperature dependence with reasonable experimental effort. The new method will consist of a variation of a directional solidification experiment, a diffusion experiment in a temperature gradient, a diffusion calculation and an optimization algorithm. The fcc-Al phase of the Al-Mg-Zn system will be used as the model material to develop and verify the new method.Samples that exhibit systematically varying concentration gradients over an extended sample length will be created. For this, the solidification velocity during steady state solidification is abruptly changed several times and the steady state is re-adjusted. This creates fluctuations in the solidifying concentration which enclose relatively narrow concentration intervals.The samples will be annealed in a temperature gradient to induce diffusion processes with locally changing kinetics. During the evaluation of each single diffusion experiment, the concentration dependence of the atomic mobilities can be neglected and diffusion processes can be assumed to be solely temperature dependent. From the diffusion experiments, atomic mobilities in an expanded temperature interval will be accessible. The diffusion equation will be solved for ternary alloys with approximations for the diffusion parameters, and an optimization routine for these parameters will be implemented. Starting with the initial concentration profiles, the evolution of the concentration profiles during the diffusion heat treatment is calculated on the basis of the temperature dependent mobility functions. The optimization algorithm that is to be elaborated adapts the mobility functions by minimizing the total deviation between the concentration profiles obtained from the diffusion experiment and the diffusion calculation. Interaction effects of the chemical potential gradients that occur during multicomponent diffusion cause special features in the diffusion profiles such as increasing concentration gradients in the vicinity of concentration gradients of the other alloying elements. These features will provide detailed information on the individual mobility functions.The currently immense effort for building up or extending mobility databases will be drastically reduced by the new method.
在拟议的项目中,将阐述一种新的方法,允许确定多组分合金中的原子迁移率,包括它们的温度依赖性与合理的实验努力。该方法由定向凝固变形实验、温度梯度下的扩散实验、扩散计算和优化算法组成。Al-Mg-Zn系统的fcc-Al相将被用作模型材料来开发和验证新方法。将创建在延长的样品长度上呈现系统变化的浓度梯度的样品。为此,在稳定状态固化期间的固化速度突然改变若干次并且重新调整稳定状态。这就造成了凝固浓度的波动,其中包含相对较窄的浓度区间。样品将在温度梯度中退火,以诱导具有局部变化动力学的扩散过程。在每个单扩散实验的评估过程中,原子迁移率的浓度依赖性可以忽略不计,扩散过程可以假设为仅依赖于温度。从扩散实验,原子迁移率在扩大的温度区间将是可访问的。三元合金的扩散方程将被求解,近似的扩散参数,这些参数的优化程序将被实施。从初始浓度分布开始,在扩散热处理过程中的浓度分布的演变计算的温度依赖的迁移率函数的基础上。要详细说明的优化算法通过最小化从扩散实验和扩散计算获得的浓度分布之间的总偏差来调整迁移率函数。在多组分扩散期间发生的化学势梯度的相互作用效应在扩散分布中引起特殊的特征,例如在其它合金元素的浓度梯度附近增加浓度梯度。这些特征将提供关于个别流动性功能的详细信息。目前建立或扩大流动性数据库的巨大努力将因新方法而大大减少。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Dr.-Ing. Hannes Engelhardt其他文献
Dr.-Ing. Hannes Engelhardt的其他文献
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