RUI: Ultrasonic Study of Phase Transitions in Metals

利用超声直接电磁产生技术研究了Ni-Al合金马氏体相变温度附近的速度和衰减的前驱效应。这项技术不仅探测材料的体积，而且还探测材料的表面，并将提供关于声子相互作用和与引起相变的缺陷相关的应变场的有价值的信息。为了确定这些合金的晶格稳定性条件，将测量弹性常数随静水压力和单轴压力的变化。与合作者的其他研究将使用中子衍射工作，以进一步表征研究项目中使用的单晶的结构。

A direct electromagnetic generation of ultrasound techniques is used to study precursor effects in the velocity and attenuation in Nickel-Aluminum alloys near the martensitic phase transformation temperature. This technique probes not only the bulk but also the surface of the materials and will yield valuable information about both the interaction of phonons and the strain fields associated with the defects which cause the transformation. The variation of the elastic constants with hydrostatic and uniaxial pressure will e measured in order to determine the conditions for lattice stability in these alloys. Additional studies with collaborators will employ neutron diffraction work to further characterize the structure of single crystals used in the research project.