Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session M04: Bridging the Gap with the Dynamic DACRecordings Available
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Chair: Rachel Husband Room: Anaheim Marriott Platinum 2 |
Tuesday, July 12, 2022 4:00PM - 4:15PM |
M04.00001: Strain rate dependence of the α to ω phase transition in titanium Larissa Huston, Eric K Moss, Jesse S Smith, Rachel Husband, Zsolt Jenei, Hanns-Peter Liermann, Blake Sturtevant Titanium (Ti) is commonly used in industrial applications such as aerospace, automotive and biomedical due to its corrosion resistance and high strength to density ratio. At high pressure (2.9-10.5 GPa), Ti transforms from the hexagonal close packed α phase to the open hexagonal ω phase.[1] This phase transformation of Ti is affected by several factors including (i) the hydrostaticity of the compression, (ii) the presence of impurities, and (iii) the compression rate.[1,2] Regarding compression rate, so far Ti has mostly been compressed using static or shock compression with one intermediate compression rate reported.[3,4] In this work, the dynamic diamond anvil cell (dDAC) coupled with time resolved X-ray diffraction was used to study the α to ω phase transformation of Ti at critical compression rates (0.01 to 3500 GPa/s) between static and shock compression rates. It was found that the onset pressure of the phase transition increased as the compression rate increased under both non-hydrostatic compression (uniaxial loading) and quasi-hydrostatic compression (in a He pressure-transmitting medium). Additionally, the onset of this phase transition was found to be ~4 GPa higher across all compression rates in the quasi-hydrostatic experiments. |
Tuesday, July 12, 2022 4:15PM - 4:30PM |
M04.00002: Solidification and Phase Transition of Simple Molecule under Rapidly Modulating Pressure Choong-Shik Yoo, Alex Howard, Sohan Ahmed, Minseob Kim Understanding the structural evolution and kinetics of phase transitions under dynamic compression has been an active area of research for many decades. Primarily, these studies have used either gas guns or lasers to drive the sample at high strain rates. Relatively recent development of piezo-electric-actuator driven dynamic- diamond anvil cells (d-DAC) can bridge the strain rate gap between traditional static DAC and shock compression studies. Coupling with the 3G(synchrotron) and 4G(XFEL) X-rays and time-resolved (TR) optical and spectroscopic probes, d-DAC is now capable to probe the time-evolution of crystal structure and chemical bonding under dynamic loadings to 103/sec. The study in this intermediate strain rate regime is important, not only to complement conventional static (<10-1/s) and shock wave (>105/s) experiments along nearly isothermal compression pathways, but also because the diffusion process in dense fluid and solid occurs in this time scale (µs to ms). In this talk, following a brief description of recent technology development amid d-DAC and various TR probes, we will describe our recent efforts of d-DAC to investigate (1) crystallization and growth of H2, D2, and H2O and (2) phase transitions of N2 under rapidly modulating pressures. |
Tuesday, July 12, 2022 4:30PM - 4:45PM |
M04.00003: Characterisation of single crystal Ta with respect to strain rate Mark A Collinson, Glenn Whiteman, Jeremy C Millett, Michael J Cox, Robert M Quinn, Paul A Hooper, Yu-Lung Chiu Results will be presented from compression experiments on single crystal tantalum in lattice orientations [100], [110], [111] and [-149] across a wide range of strain rates between 10-3 s-1 and 104 s-1. Experiments utilised a screw driven load frame and minimised split Hopkinson pressure bar, complementing previous data obtained via gas gun plate impact. All orientations demonstrated a Strain Rate Sensitivity (SRS) with log-linear variation in the flow stress with respect to the strain rate between 10-3 and 103 s-1 and a sharp increase in the SRS near 104 s-1 except [110]. Large variations in flow stress between the various orientations was also observed. Post-shock characterisation of recovered plate impact loaded samples between 6 and 23 GPa will also be presented. Micro-pillar compression tests were utilised in combination with scanning electron microscope (SEM) imaging to the determine Schmid factor slip systems present and the critical resolved shear stress across the different crystal orientations. The extent to which the micro-pillar data relates to differences seen between the crystal orientations in prior shock loading velocimetry and uniaxial stress compression tests will be discussed. © Crown Owned Copyright 2022/AWE. |
Tuesday, July 12, 2022 4:45PM - 5:00PM |
M04.00004: Exploring the Effect of Temperature and Compression Rate on Phase Transition Boundaries in Tin Daniel Sneed, Earl F O'Bannon, Hyunchae Cynn, Zsolt Jenei The development of the dynamic diamond anvil cell (dDAC) has created the ability to probe potential kinetic effects on the high-pressure behavior of different materials [Jenei et al., RSI, 2019]. The implementation of resistive heating to the dDAC adds an additional degree of freedom for probing a materials thermodynamic properties under controlled dynamic conditions. By precisely tuning compression rates from millisecond timescales up to second timescales and temperatures up to 1000 °C, we can systematically probe phase transition mechanisms and help to bridge the gap between static and shock compression experiments. I will present our recent work on Sn dynamically compressed along its room temperature isotherm, as well as benchmarking static high-pressure high-temperature experiments measuring the β-Sn → BCT and BCT → BCC Clapeyron slopes. I will present a systematic study of the β-Sn → BCT and BCT → BCC transition pressures as a function of compression rate, as well as discuss the effect of transition rate on the large phase co-existence region of the kinetically hindered BCO → BCC phase transition. |
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