MRI: Development of Multi-field Resonant Ultrasound Spectroscopy

MRI：多场共振超声光谱的发展

基本信息

批准号：
1726887
负责人：
Miladin Radovic
金额：
$ 53.44万
依托单位：
Texas A&M Engineering Experiment Station
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2022-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1726887&HistoricalAwards=false
关键词：
MRI Development Multi field Resonant

项目摘要

Elastic constants are fundamental properties of any solid material and knowing their changes with temperature and/or under applied magnetic or electric field is essential for understanding different physical processes that take place in different materials. However, measurement of elastic constants using conventional techniques is not always a trivial task. It usually requires large number of samples and/or numerous time-consuming tests, especially if the measurements are performed at low and high temperatures and/or under various external stimuli such as electric and magnetic fields. Multi-field Resonant Ultrasound Spectroscopy (MF-RUS) apparatus under development in this project will allow rapid experimental determination of the full set of elastic constants of any solid from the single test using only one sample as small as 1 mm3 in the wide temperature range, with or without applied electric or magnetic fields. The broad capabilities of the MF-RUS will enable comprehensive characterization of different solids, and enhance research in many fields, including materials science and engineering, physics, and chemistry. By allowing rapid and easy evaluation of elastic properties of different materials, utilization of MF-RUS will further foster development of new materials for widely varying applications including energy harvesting, storage and conversion, defense, and transportation systems. Once developed, this unique instrument will be available to researchers from other academic institutions, industry and laboratories through a well-established Materials Characterization Facility's users program at Texas A&M University. Eighteen research projects at Texas A&M University and other academic institutions, including two minority serving institutions, currently supported by NSF and other federal agencies will benefit immediately from the development of MF-RUS.Elastic constants, as the second derivatives of the free energy with respect to strain, not only relate stress and strain tensors, but also provide fundamental information about the character of atomic bonding in solids, and thus they are considered to be one of the most fundamental materials properties. While the elastic constants represent primarily equilibrium thermodynamic properties, the attenuation is direct manifestation of irreversible processes related to energy absorption by various physical processes in the material. Resonant Ultrasound Spectroscopy (RUS) is a simple, inexpensive and elegant experimental technique that can be used to determine simultaneously Young's and shear moduli of isotropic solids, or a full set of elastic constants (Cij) of single crystals, as well as ultrasonic attenuation, using single crystal or polycrystalline sample as small as 1 mm3. Currently, commercially available RUS instruments are limited to room temperature measurements while some existing custom-made RUS systems allow measurements up to 1320ºC in controlled environments, in magnetic fields up to 7T from cryogenic temperatures to 327ºC, or under an electric field but only at room temperature. A Multi-Field Resonant Ultrasound Spectroscopy (MF-RUS) system under development in this project will be unique since it will allow simultaneous measurements of elastic constants and ultrasonic attenuation of solid materials from liquid helium temperature up to 1900ºC, with or without electric fields of up to 1000 V/mm or magnetic fields of up to 7T, and in various atmospheres (air, high vacuum, inert gases, etc.) This RUS system will be modular and will be developed in stages over the 3-year project period with partial functionality as each module is added. This instrument will provide a powerful new tool to observe and quantify changes in elastic coefficients and ultrasonic attenuation as a result of various physical processes in the solid, such as first- and second-order phase transformations or different inelastic relaxation mechanisms due to different processes such as thermoelastic relaxation and motion of point defects (e.g. interstitial and vacancy hopping), linear defects (e.g. dislocations) or planar defects (e.g. domain walls or martensitic transformation phase interfaces, etc.).

弹性是任何固体的特性，并且知道它们在温度下的变化和地下磁场磁场对于不同的过程至关重要。该项目中正在开发的多场谐振超声光谱（MF-RUS）设备，允许快速确定从单个测试中使用Onle One One样品在宽温度范围内从单个测试中确定Af Ny solid的饱和常数或没有施加的电场或磁场。，储存式的转换，防御和运输系统。机构的构造将立即受益于MF -rus.lastic Constraine，作为类似的第二个衍生物，重新构成有关固体中原子结合特征的心理信息的重新限制，因此所承认的是最基本的之一材料。在受控环境中，单晶或多晶样品少于1 mm3 - 该项目正在开发的场谐振光谱（MF-RUS）系统将是独一无二的7T和各种气氛（空气，高真空，惰性气体等）在3年的项目期间开发出阶段，并在每个模块中添加部分功能。量化固体中各种物理过程的弹性系数和超声衰减的变化，例如一阶和二阶相变或不同的无弹性弛豫机制，导致不同的prochanistis prochanistis热弹性弛豫的点缺陷），线性缺陷（例如。位错）或平面缺陷（例如域壁或马氏体变换阶段互动等）。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Fabrication and characterization of aluminum - magnetic shape memory alloy composites

铝磁形状记忆合金复合材料的制备及表征

DOI：
10.1016/j.msea.2020.140549
发表时间：
2021
期刊：
Materials Science and Engineering: A
影响因子：
0
作者：
Barta, N.E.;Fincher, C.;Bolon, A.M.;Attari, V.;Higgins, W.;Arroyave, R.;Radovic, M.;Pharr, G.M.;Karaman, I.
通讯作者：
Karaman, I.

Performance of Al-Al2O3 Composites under Coupled Mechanical and Thermal Stimuli

Al-Al2O3 复合材料在机械和热耦合刺激下的性能