Article
Geochemistry & Geophysics
William A. Bassett, Elise A. Skalwold
Summary: Experiments have shown that the olivine-ringwoodite transition occurs in two steps for several compositions, with implications for deep-focus earthquakes, water storage in minerals, and the observation of blue olivine inclusions.
Article
Nanoscience & Nanotechnology
Qing Tan, Zhiran Yan, Runguang Li, Yang Ren, Yandong Wang, Baptiste Gault, Stoichko Antonov
Summary: This study investigates the deformation behavior of hydrogen-charged commercially pure titanium using in-situ high energy X-ray diffraction. The results reveal that the peak broadening in the diffusion patterns is caused by high internal and interphase stresses generated within and around the hydrides due to volume expansion caused by phase transformation. The hydrides exhibit high strength but brittle secondary phase behavior and sustain larger strains than the matrix. This study provides valuable insights into hydride deformation behavior and hydrogen embrittlement in titanium and zirconium.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
R. Utsumi, M. Morimoto, H. Saitoh, T. Watanuki, T. Sato, S. Takagi, S. Orimo
Summary: The researchers synthesized metal hydrides comprising only metals with low hydrogenation affinity which cannot form metal hydrides below 1 GPa. By clarifying the hydrogenation reaction processes of FexMo1-x alloys, they were able to classify the reaction process into three types and synthesize two novel hydrides, one of which has metal elements at the vertices of hexagonal close-packed lattices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Kartik Prasad, Yuuki Horita, Atsushi Ito, Shiro Torizuka
Summary: The study revealed that the Ni base superalloy manufactured additively had a relatively higher dislocation density and a higher proportion of screw dislocations during plastic deformation compared to the wrought counterpart. Heat treatment is suggested for the as-built parts to improve efficiency.
SCRIPTA MATERIALIA
(2021)
Article
Geochemistry & Geophysics
Yuval Boneh, Emily J. Chin, Greg Hirth
Summary: By studying a sheared peridotite xenolith deformed under comparable strain rates to laboratory shearing time scales, variations in microstructure between monophase and multiphase bands were observed, shedding light on the rheological properties of the upper mantle. The microstructure analysis revealed a dominant and secondary activated crystallographic preferred orientation in olivine grains, along with deformation mechanisms involving dislocation creep and dynamic recrystallization. The reduction of grain size in orthopyroxene was found to promote activation of diffusion creep, indicating a high activation volume for wet orthopyroxene dislocation creep.
Article
Geosciences, Multidisciplinary
Wenqing Sun, Lidong Dai, Haiying Hu, Mengqi Wang, Ziming Hu, Chenxin Jing
Summary: The electrical structures of the Earth's upper mantle are influenced by the ilmenite contents in the olivine-ilmenite systems. Conductivity increases with temperature and slightly with pressure. Interconnected ilmenites greatly enhance the conductivities of the system.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Spectroscopy
F. M. Rufino, D. L. M. Vasconcelos, P. T. C. Freire, R. C. Oliveira, C. M. R. Remedios, J. H. da Silva, F. G. Alabarse, J. A. Lima
Summary: Maleic acid was studied under high pressure conditions using Raman spectroscopy and powder synchrotron XRD. The results showed a decrease in lattice parameters and a reduction in unit cell volume. Changes in compressibility were observed at specific pressure points.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Materials Science, Multidisciplinary
Antoine Cornet, Gaston Garbarino, Federico Zontone, Yuriy Chushkin, Jeroen Jacobs, Eloi Pineda, Thierry Deschamps, Shubin Li, Alberto Ronca, Jie Shen, Guillaume Morard, Nico Neuber, Maximilian Frey, Ralf Busch, Isabella Gallino, Mohamed Mezouar, Gavin Vaughan, Beatrice Ruta
Summary: By combining the brightest x-rays available in synchrotrons with cutting edge high pressure technologies, this study provides direct evidence of the microscopic structural and dynamical mechanisms occurring under in-situ high pressure compression and decompression in metallic glasses. The results show that while pressure promotes density increasing through quasi-elastic structural deformations, the atomic mobility exhibits a hysteresis and is enhanced up to a factor 15 even at temperatures well below the glass transition. This surprising behavior results from a competition between fast avalanche-like atomic rearrangements and slow relaxation processes triggered by an anomalous super-diffusive collective particle displacement.
Article
Nanoscience & Nanotechnology
Akihide Hosokawa, Yusuke Hirayama
Summary: Sm2Fe17N3 coarse powder was consolidated into a disc magnet using high-pressure torsion technique and achieved grain subdivision within the powder particles, resulting in a bulk magnet with increased coercivity. The generation of grain subdivision was found to be associated with the motion of dislocations in non-basal planes. However, excessively large strain led to the loss of the hard magnetic phase and the coercivity.
SCRIPTA MATERIALIA
(2023)
Review
Astronomy & Astrophysics
Jessica M. Warren, Lars N. Hansen
Summary: The strength of lithospheric plates, which is governed by brittle and ductile processes, is a key factor in plate tectonics. Experimental studies on olivine, the main mineral in the lithosphere, reveal that it deforms through various mechanisms including low-temperature plasticity, dislocation creep, and grain-boundary sliding. While deformation in most of the lithosphere is dominated by grain-boundary sliding, shear zones exhibit diffusion creep and the brittle-ductile transition may involve low-temperature plasticity. There is a discrepancy between observations from naturally deformed rocks and geophysical predictions, possibly due to uncertainties in the brittle-ductile transition where the lithosphere is strongest.
ANNUAL REVIEW OF EARTH AND PLANETARY SCIENCES
(2023)
Article
Multidisciplinary Sciences
Valery Levitas
Summary: This study presents a developed theory that explains the puzzles of deep-focus earthquakes, including the coupled deformation, plastic strain-induced phase transformation, transformation-induced plasticity, and self-blown-up deformation-transformation-heating process in shear bands. By considering the transformation in olivine as plastic strain-induced and finding an analytical solution for the coupled deformation-transformation-heating process in shear bands, the study provides insights into the mechanisms behind the jump in strain rates and sudden transformation of metastable olivine. The study also highlights the importance of the thermomechanochemical feedback in the severe transformation-induced plasticity and self-blown-up deformation-transformation-heating process.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Sergey Goryainov, John S. Tse, Serge Desgreniers, Saori Kawaguchi, Yuanming Pan, Anna Yu Likhacheva, Maxim S. Molokeev
Summary: This study investigated the behavior of chrysotile Mg-3(Si2O5)(OH)(4) in high pressure and high temperature water medium using in situ synchrotron X-ray diffraction. The results showed that chrysotile in water-saturated conditions undergoes two-phase transitions and exhibits higher thermal stability. The sequential transformations of hydrous phases observed in this study have implications for potential water transport mechanisms to the deep mantle.
PHYSICS AND CHEMISTRY OF MINERALS
(2021)
Article
Metallurgy & Metallurgical Engineering
Ying-Xi Li, Fan-Qiang Meng, Rui Yuan, Guo-Qiang Huang, Dong-Bai Sun
Summary: The study of phase transformation sequence and the formation mechanism of metastable phases in Al89Ce11 amorphous ribbon reveal the potential of structural heredity in controlling the microstructure and properties of Al-based alloys.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
X. Liu, L. Song, A. Stark, F. Pyczak, T. B. Zhang
Summary: In this study, the internal strain evolution and load partitioning between the α2 and γ phases at high temperatures in TiAl alloys are characterized using in-situ synchrotron high energy X-ray diffraction (HEXRD) technique for the first time. The γ phase exhibits plastic deformation at a stress of approximately 200 MPa, while the α2 phase exhibits plastic deformation at a stress of approximately 775 MPa. The internal strains in the α2 phase are almost fully relaxed during heating through substantial dislocation annihilation and rearrangement in the γ phase. These findings provide guidance for stress relief annealing of TiAl components.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Zenji Horita, Daisuke Maruno, Yukimasa Ikeda, Takahiro Masuda, Yongpeng Tang, Makoto Arita, Yuji Higo, Yoshinori Tange, Yasuo Ohishi
Summary: This study applied severe plastic deformation through high-pressure sliding on pure Ti to examine the allotropic transformation. It was found that straining by high-pressure sliding processing was effective in promoting phase transformation and maintaining the transformed phase, while the reverse transformation from omega phase to alpha phase is controlled by thermal energy.
MATERIALS TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Chunyuan Liang, Ke Tong, Junquan Huang, Yeqiang Bu, Jiabin Liu, Zhisheng Zhao, Lin Wang, Bo Xu, Zhongyuan Liu, Yanbin Wang, Anmin Nie, Hongtao Wang, Wei Yang, Yongjun Tian
Summary: The study demonstrates that ultra-large plastic deformation mediated by dislocations can be achieved at room temperature in submicron single-crystal pillars, providing new insights into potential applications of ceramics at submicron scales.
MATERIALS TODAY PHYSICS
(2022)
Article
Multidisciplinary Sciences
Feng Shi, Yanbin Wang, Jianguo Wen, Tony Yu, Lupei Zhu, Taizi Huang, Kelin Wang
Summary: Studies have shown that intermediate-depth earthquakes in subducted oceanic slabs often form a double band of seismicity. While the upper band is thought to be facilitated by dehydration reactions, the faulting mechanism of the lower band of seismicity (LBS) remains controversial. This study uses controlled deformation experiments and acoustic emission detection to simulate the mechanical behavior of metamorphosing olivine in the subducted mantle lithosphere. The results suggest that metamorphosing olivine likely plays an important role in intraslab earthquake processes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Binbin Yue, Matthias Krug, Carmen Sanchez-Valle, Sebastien Merkel, Fang Hong
Summary: Many MO2 compounds undergo a structural transformation from rutile to CaCl2 under high pressure. In this study, they used MnO2 as a representative system to investigate the deformation behavior and slip systems of CaCl2-structured dioxides. The study found that pressure has a significant effect on the deformation behavior and slip systems, and MnO2 transforms back to rutile upon pressure release.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Geosciences, Multidisciplinary
Estelle Elisa Ledoux, Feng Lin, Lowell Miyagi, Ahmed Addad, Alexandre Fadel, Damien Jacob, Franck Beclin, Sebastien Merkel
Summary: This study investigates the deformation of polycrystalline MgO under different conditions and finds that temperature plays an important role in the deformation mechanism. At high temperatures, deformation is controlled by grain boundary sliding, while at low temperatures, deformation is controlled by dislocations. The results of this study have important implications for understanding ferropericlase and seismic observations in the Earth's lower mantle.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Multidisciplinary Sciences
Kun Luo, Bing Liu, Wentao Hu, Xiao Dong, Yanbin Wang, Quan Huang, Yufei Gao, Lei Sun, Zhisheng Zhao, Yingju Wu, Yang Zhang, Mengdong Ma, Xiang-Feng Zhou, Julong He, Dongli Yu, Zhongyuan Liu, Bo Xu, Yongjun Tian
Summary: This study presents the identification of coherent graphite-diamond interfaces using high-angle annular dark-field scanning transmission electron microscopy. Theoretical calculations confirm that transformation through these interfaces is energetically favored. The study also provides insights into the possible pathways and sheds light on the transformation mechanisms of other carbon materials and boron nitride under different synthetic conditions.
Article
Geochemistry & Geophysics
Jean -Philippe Perrillat, Benoit Tauzin, Julien Chantel, Julie Jonfal, Isabelle Daniel, Zhicheng Jing, Yanbin Wang
Summary: This study investigates the characteristics of the 410-km seismic discontinuity and discovers the transformation mechanism of olivine to wadsleyite, explaining the sharpness and reflectivity of the discontinuity.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Matthias Krug, Morvarid Saki, Estelle Ledoux, Jeffrey P. Gay, Julien Chantel, Anna Pakhomova, Rachel Husband, Arno Rohrbach, Stephan Klemme, Christine Thomas, Sebastien Merkel, Carmen Sanchez-Valle
Summary: In this study, the researchers investigated the coesite-stishovite phase transition in SiO2 and its impact on the mantle by conducting experiments and simulations. The results showed that the phase transition plays a critical role in the seismic velocity and impedance contrasts, and the X-discontinuity observed at depths shallower than 300 km may be related to the coesite-stishovite transition.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geochemistry & Geophysics
Jeffrey P. Gay, Estelle Ledoux, Matthias Krug, Julien Chantel, Anna Pakhomova, Hanns-Peter Liermann, Carmen Sanchez-Valle, Sebastien Merkel
Summary: In this study, multigrain crystallography X-ray diffraction was used to track microstructures induced by phase transitions. The results show strong 001 transformation textures in bridgmanite, weak maxima in 101 and 111 orientations in davemaoite, and no texture in ferropericlase after the transformation. The study also predicts anisotropy and shear wave splitting below the '660' discontinuity.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
E. Kolesnikov, I. Kupenko, M. Achorner, C. Plueckthun, H. -P. Liermann, S. Merkel, C. Sanchez-Valle
Summary: Understanding the deformation properties of candidate core-forming materials, particularly silicon, is crucial for revealing the interior details of distant planets. By investigating the deformation behavior of ε-FeSi phase, it was found that polycrystalline aggregates of iron silicide are nearly isotropic under extreme conditions.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Man Xu, Zhicheng Jing, Young Jay Ryu, Julien Chantel, James A. Van Orman, Tony Yu, Yanbin Wang
Summary: This study measures the acoustic velocities of a model basalt glass under different P-T conditions. The results show that the glass displays anomalous changes in velocity with pressure, and temperature can facilitate densification of the glass.
AMERICAN MINERALOGIST
(2023)
Article
Physics, Applied
Nicolas Jaisle, David Cebron, Zuzana Konopkova, Rachel J. Husband, Clemens Prescher, Valerio Cerantola, Anand Dwivedi, Johannes M. Kaa, Karen Appel, Khachiwan Buakor, Orianna B. Ball, Ryan S. Mcwilliams, Cornelius Strohm, Motoaki Nakatsutsumi, Ulf Zastrau, Carsten Baehtz, Marzena Anna Baron, Eric Edmund, Joydipa Biswas, James D. Mchardy, Blake T. Sturtevant, Lars Ehm, Alexander F. Goncharov, Malcolm I. Mcmahon, Johannes Buchen, Hyunchae Cynn, Edward J. Pace, Hanns-Peter Liermann, Daniel T. Sneed, Samantha C. Cooper, Madison Anae, Jaeyong Kim, Zhongyan Wu, Yongjae Lee, Huijeong J. Hwang, Taehyun Kim, Jinhyuk Choi, Jeongmin Lee, Sebastien Merkel, Julien Chantel, Egor G. Koemets, Hauke Marquardt, Vitali B. Prakapenka, Stella Chariton, Elena Shevchenko, Guillaume Fiquet, Angelika D. Rosa, Mohamed Mezouar, Gaston Garbarino, Guillaume Morard
Summary: A new experimental approach combining pulsed laser heating with MHz x-ray diffraction has been implemented to determine liquidus temperatures under extreme conditions. This study focuses on a Fe-Si-O ternary system and uses a time-resolved diagnostic complemented by a finite-element model to reproduce temperature profiles. The model includes pressure and temperature dependencies as well as heat-induced thermal stress. The results show significant improvements compared to previous models, providing temperature, pressure, and volume conditions relevant to planetary cores.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
O. B. Ball, C. Prescher, K. Appel, C. Baehtz, M. A. Baron, R. Briggs, V. Cerantola, J. Chantel, S. Chariton, A. L. Coleman, H. Cynn, H. Damker, D. Dattelbaum, L. E. Dresselhaus-Marais, J. H. Eggert, L. Ehm, W. J. Evans, G. Fiquet, M. Frost, K. Glazyrin, A. F. Goncharov, R. J. Husband, H. Hwang, N. Jaisle, Z. S. Jenei, J. Y. Kim, Y. Lee, H. P. Liermann, J. Mainberger, M. Makita, H. Marquardt, E. E. McBride, J. D. McHardy, M. I. McMahon, S. Merkel, G. Morard, E. F. O'Bannon III, C. Otzen, E. J. Pace, A. Pelka, C. M. Pepin, J. S. Pigott, C. Plueckthun, V. B. Prakapenka, R. Redmer, S. Speziale, G. Spiekermann, C. Strohm, B. T. Sturtevant, P. Talkovski, L. Wollenweber, U. Zastrau, R. S. McWilliams, Z. Konopkova
Summary: This study made direct measurements of temperature in XFEL experiments using spectral streaked optical pyrometry, and obtained stable and accurate dynamic temperature results on the High Energy Density instrument. High-energy hard X-ray laser pulses and infrared laser pulses were used in the study, and spectral emission results were obtained within the continuous spectrum range. In addition, the study explored other possibilities of using spectroscopy in X-ray laser experiments and discussed the emission scenarios of combined light sources and their interpretation methods. The challenges of using X-ray lasers as non-invasive probes of sample state have also been addressed.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Instruments & Instrumentation
Tommaso Mandolini, Julien Chantel, Seastien Merkel, Yann Le Godec, Nicolas Guignot, Andrew King, Jerome Hosdez, Laura Henry, Nadege Hilairet
Summary: This article introduces the use of high-pressure torsion apparatus combined with in situ XRT to study the microstructures of materials under large shear strains. The actual shear strain in the samples is quantified based on the twisting angles of the anvil. The study explores the use of XRT for quantification and in situ observation of the deformation microfabrics of two-phase aggregates under high shear strain. The limitations of using the RoToPEc and synchrotron XRT for real-time investigation of deformation microstructures are outlined.
JOURNAL OF SYNCHROTRON RADIATION
(2023)
Article
Geosciences, Multidisciplinary
Qiushi Zhai, Zhigang Peng, Makoto Matsubara, Kazushige Obara, Yanbin Wang
Summary: This study investigates the spatiotemporal changes of intermediate-depth earthquakes in the double seismic zone beneath Central and Northeastern Japan before and after the 2011 Tohoku earthquake. The results show a clear increase in intermediate-depth earthquake rate following the Tohoku earthquake, with higher aftershock productivity in the upper plane compared to the lower plane.
GEOPHYSICAL RESEARCH LETTERS
(2023)