Controlled Development and Prediction of Zero-flux Planes, Diffusion Paths and Diffusion Structures in Multicomponent and Multiphase Systems

多组分和多相系统中零通量平面、扩散路径和扩散结构的受控发展和预测

• 批准号: 0304777
• 负责人: Mysore Dayananda
• 金额: $ 50万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0304777&HistoricalAwards=false
• 关键词: Controlled; Development; Prediction; Zero; flux

This grant explores the phenomenon of isothermal diffusion at 775oC in alpha (a, fcc) and beta (b, bcc) single phase and multiphase alloys in the Cu-Ni-Zn system. A major objective is to reduce interdiffusion of a component through development of a series of zero-flux planes (ZFP) adjacently spaced within the diffusion zone. The study also investigates intrinsic and interdiffusion, as well as development of zero-flux planes, diffusion paths and diffusion structures, in diffusion couples characterized by controlled thermodynamic forces for two of the components. Other goal of the proposed investigations is to develop a user-friendly, multicomponent diffusion code equipped with a library of diffusion data for several multicomponent systems, and capable of analysis and prediction of diffusion paths and diffusion structures in multicomponent assemblies.%%%The experimental portions involve assembling infinite and finite diffusion couples with a and b Cu-Ni-Zn alloys having compositions on an isoactivity line for Ni. These couple pairs are so assembled that the activity differences for Zn and Ni between the terminal alloys are identical in magnitude but different in sign. All couples are analyzed by electron microbrobe techniques. Diffusion structure development in multiphase couples is examined by scanning electron microscopy and transmission electron microscopy. These controlled experiments contribute to better understanding and insights into the intrinsic and interdiffusion phenomena as well as ZFP development in multicomponent systems. The development of the planned diffusion code is expected to serve as a teaching, research and design tool for the analysis and prediction of diffusion paths in multicomponent, multiphase systems and can reach a large audience in the fields of education and industry.***

研究了铜镍锌系中α(a，fcc)和β(b，bcc)单相和复相合金在775oC下的等温扩散现象。一个主要目标是通过形成一系列在扩散区内相邻间隔的零通量平面(ZFP)来减少组分的相互扩散。该研究还研究了扩散偶的本征扩散和互扩散，以及零通量平面、扩散路径和扩散结构的发展，这些扩散对的特征是其中两个组分的热力学控制。这项研究的另一个目标是开发一种用户友好的多组分扩散程序，该程序配有多个多组分系统的扩散数据库，并能够分析和预测多组分组件中的扩散路径和扩散结构。%实验部分包括用组分在Ni等活度线上的a和b铜镍锌合金组装无限和有限扩散偶。这些偶对的组装使得锌和镍在终端合金之间的活度差异在大小上相同，但在符号上不同。所有的电偶都用电子显微镜技术进行了分析。用扫描电子显微镜和透射电子显微镜研究了多相偶的扩散结构发展。这些受控实验有助于更好地理解和洞察多组分体系中的本征和互扩散现象以及零点现象的发展。计划中的扩散代码的开发预计将作为分析和预测多组分、多相系统扩散路径的教学、研究和设计工具，并可在教育和工业领域接触到大量受众。