Presidential Young Investigator Award: Metastable Phase Formation in Intermetallic Systems

总统青年研究员奖：金属间化合物系统中亚稳态相的形成

• 批准号: 8657581
• 负责人: David Van Aken
• 金额: $ 26.4万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-09-01 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8657581&HistoricalAwards=false
• 关键词: Presidential; Young; Investigator; Award; Metastable

The project deals with a study on combinations of C.sC1 (B.2) compounds which have potential for the formation of continuous solid solutions. Initial studies will focus on a combination of ReAl and NiAl which will be produced by Ion.beam mixing. Ni and Re should substitute freely on the Ni sub.lattice with the possibility of a spinodal decomposition. Thermodynamic and kinetic studies will be performed on alloys based on the quasi-binary phase diagram defined by the two B-2 structures. Decomposition of the solid solution alloys will be performed using a hot stage in situ in an analytical transmission electron microscope. In addition, anti.phase domains are expected to form in the B.2 structure and these features will be studied, if feasible, by high resolution microscopy. In situ deformation studies will also be performed with expectation of observing a change in the operating slip system of the B.2 structures. Rapid solidification processing will be explored for alloys exhibiting favorable slip behavior. Additional studies will focus on the Heusler.type alloys.

该项目涉及C.sC1（B.2）组合的研究。 具有形成连续的 固体解决方案。 初步研究将侧重于以下方面的结合： 用离子束混合法制备了真实的和NiAl。 Ni和 Re应该在Ni亚晶格上自由地被 有可能是亚稳分解 热力学和 动力学研究将在合金的基础上进行 由两个B-2结构定义的准二元相图。 将进行固溶体合金的分解 在分析透射电子显微镜中原位使用热台 显微镜 此外，反相域预计将形成 在B.2结构中，将研究这些特征，如果 通过高分辨率显微镜， 原地变形 还将进行研究，以期观察到 B.2结构的操作滑移系统的变化。 快速 将探讨凝固处理的合金表现出 良好的滑动性能。 更多的研究将集中在 Heusler型合金