Abstract
Resonant ultrasound spectroscopy (RUS) is an efficient, nondestructive technique to study the elastic properties of solids. A low-temperature (2-300 K) probe has been assembled and tested at the NOMAD beamline at the Spallation Neutron Source at Oak Ridge National Laboratory to assess the probe’s neutronic properties, data acquisition system, and compatibility with existing sample environment. A case study on a bulk metallic glass, La 65 Cu 20 Al 10 Co 5, served to benchmark both hardware and software developments. The elastic constants of the metallic glass were determined as a function of temperature between 4 and 300 K and were used to guide neutron diffraction measurements at NOMAD. Tracking of a specific RUS peak center frequency and width enabled live monitoring of the sample temperature evolution that lagged thermometry by upwards of 40 K near room temperature. Assembly of a high-temperature (300-875 K) probe is underway and both probes are scheduled to be available to users by late-2021. Our aim is to provide users with live monitoring of an intrinsic variable at the neutron scattering beamlines, in addition to existing controls, to monitor the state of their samples and its elastic moduli and make informed decisions in real time.
| Original language | English |
|---|---|
| Article number | 045001 |
| Journal | Proceedings of Meetings on Acoustics |
| Volume | 43 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jun 7 2021 |
| Event | 180th Meeting of the Acoustical Society of America, ASA 2021 - Virtual, Online Duration: Jun 8 2021 → Jun 10 2021 |
Funding
This project is sponsored by the Laboratory Directed Research and Development (LDRD) program of ORNL and organized into multiple tasks: ultrasound probe design and assembly, data acquisition and software development, and demonstration of capabilities at neutron beamlines at ORNL. In Section 2, we provide an overview of the design of a RUS probe for low temperature measurements and describe the data acquisition methodology for neutron diffraction measurements at the SNS. Then, in Section 3, we present results from a case study of a bulk metallic glass, which will be the subject of planned experiments in 2021. We aim to provide RUS probes (low and high temperature) to the ORNL neutron scattering user program in late-2021. This work was funded by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U. S. Department of Energy. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Measurement assistance (A.F.M.) was supported by the U. S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The authors thank A. Migliori and F. Balakirev (Los Alamos National Laboratory) for valuable discussions regarding RUS data acquisition and software development. A. Flores-Betancourt (ORNL) helped with software development. Samples were provided by Dr. C. W. Ryu (U. Tennessee) and Prof. E. S. Park (Seoul National University). We also thank J. Gladden (NCPA, U. Mississippi) for guidance regarding high-temperature RUS probe design and J. Neuefeind (ORNL) for help analyzing NOMAD data.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | |
| Office of Science | |
| Basic Energy Sciences | |
| Oak Ridge National Laboratory | |
| Laboratory Directed Research and Development | |
| Division of Materials Sciences and Engineering |