Long & Medium Term Research: Location of Defects and Reactive Elements in Chromia

中长期研究：铬中活性元素的缺陷与定位。该奖项是在国外卓越中心长期和中期研究计划下推荐的。该项目旨在使美国科学家和工程师能够在国外被证明卓越的研究机构进行长期研究。该奖项为开展联合研究以及利用国外独特或互补的设施、专业知识和实验条件提供了机会。该奖项由Donald I. Potter博士赞助，将支持Janet M. Hampikian博士对澳大利亚墨尔本CSIRO材料科学与技术部门进行为期12个月的博士后研究访问。在C. J. Rossouw博士的指导下进行“Chromia中活性元素的缺陷和位置”的研究，以揭示由于添加活性元素而导致铬形成合金氧化动力学降低的机制。许多高温合金依赖于铬元素保护层的形成。在这些合金中添加活性元素的效果之一是，与零件寿命的增加相对应的铬度增长的减少。这一建议的重点是确定这些活性元素掺杂剂在铬晶格中所起的作用。具体来说，研究人员将确定控制未掺杂铬的扩散的点缺陷类型，以及掺杂剂的位置。为了实现这一目标，他们将对电子通道微分析数据进行增强的微分析和统计分析。奖励建议提供资金，酌情支付国际旅行，本地旅行，津贴，家属津贴（如果适用），以及美国本土机构250美元的固定行政津贴。

Long & Medium-Term Research: Defects and Locations of Reactive Elements in Chromia. This award recommendation is made under the Program for Long & Medium-Term Research at Foreign Centers of Excellence. The program seeks to enable U.S. scientists and engineers to conduct long-term research abroad at research institutions of proven excellence. Awards provide opportunities for the conduct of joint research, and the use of unique or compli- mentary facilities, expertise and experimental conditions in foreign countries. This award for a proposal sponsored by Dr. Donald I. Potter will support a twelve-month postdoctoral research visit by Dr. Janet M. Hampikian to the CSIRO Division of Materials Science and Technology in Melbourne, Australia, to work under the direction of Dr. C. J. Rossouw on "Defects and Locations of Reactive Elements in Chromia" to shed new light on the mechanisms causing the reduction in oxidation kinetics of chromia-forming alloys due to reactive element additions. Many high temperature alloys rely on the formation of a protective layer of chromia. A decrease in chromia scale growth, corresponding to an increase in part lifetime, is one of the effects of reactive element additions to these alloys. This proposal focuses on determining the role that these reactive element dopants play in the chromia lattice. Specifically, the researchers will establish the type of point defect that controls diffusion in undoped chromia, as well as the position of the dopants. To accomplish this, they will channel enhanced microanalysis and statistical analysis of electron channeling microanalytic data. The award recommendation provides funds to cover, as appropriate, international travel, local travel abroad, stipend, dependents' allowance if applicable, and a flat administrative allowance of $250 for the U.S. home institution.