Presidential Young Investigator Award: Metastable Phase Formation in Intermetallic Systems

该项目涉及有可能形成连续固溶体的C.sC1 （B.2）化合物组合的研究。最初的研究将集中在ReAl和NiAl的组合上，这将由Ion公司生产。混合梁。Ni和Re在Ni亚晶格上可以自由替换，并有可能进行旋量分解。基于两种B-2结构定义的准二元相图，将对合金进行热力学和动力学研究。固溶体合金的分解将在分析透射电子显微镜下使用原位热阶段进行。另外，防。相域预计在B.2结构中形成，如果可行的话，这些特征将通过高分辨率显微镜进行研究。还将进行现场变形研究，期望观察到B.2构造的运行滑移系统的变化。将探讨具有良好滑移性能的合金的快速凝固工艺。更多的研究将集中在Heusler上。型合金。

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.