Article
Materials Science, Multidisciplinary
P. Chen, Q. C. Zhang, F. Zhang, J. H. Du, F. Shi, X. W. Li
Summary: The multi-stage work hardening process of an Fe-Mn-Al-C lightweight austenitic steel was studied experimentally, with a focus on the critical role of kappa-carbides. The inhibition of kappa-carbides on the motion of dislocations contributes to high yield strength. The shearing of kappa-carbide particles by moving dislocations causes slip plane softening, leading to the formation of planar-slip dislocation substructure and the occurrence of work hardening rate recovery and plateau stages.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Multidisciplinary
P. Kot, M. Wronski, A. Baczmanski, A. Ludwik, S. Wronski, K. Wierzbanowski, Ch. Scheffzuek, J. Pilch, G. Farkas
Summary: A novel method using neutron diffraction was proposed to determine stresses and critical resolved shear stresses. The advantage of this method is that it directly measures the stresses for grain groups with similar orientations without the need for data interpretation models. It also allows for the determination of the uncertainty of the measured values and an explanation of the anisotropic mechanical behavior of the alloy. The method can also validate intergranular interaction assumptions and reduce the number of unknown parameters in the model.
Article
Geosciences, Multidisciplinary
Arqam Muqtadir, Saud Al-Dughaimi, Taqi Alzaki, Jack Dvorkin
Summary: This study compares the P-wave and S-wave velocities obtained under different hydrostatic loading conditions using ultrasonic pulse transmission experiments. The results show significant differences in velocities when a smaller hydrostatic stress is added to axial stress, but these differences become smaller as the hydrostatic stress increases. The findings suggest that laboratory hydrostatic experiments can be used for in-situ velocity estimates even under strong in-situ contrasts between the vertical and horizontal stresses.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Min-Su Lee, A-Ra Jo, Sun-Kwang Hwang, Yong-Taek Hyun, Tea-Sung Jun
Summary: The study investigates the influence of strain rate and crystallographic texture on the hardening behavior and ductility of commercially pure titanium plate. Lower strain rate and cryogenic temperature lead to improved elongation and strain hardening, with a more significant effect observed at low temperatures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Jing Xu, Bo Guan, Yunchang Xin, Xiao Li, Peidong Wu, Xiaoxu Huang, Qing Liu
Summary: This study systematically investigated the mechanism by which Li additions induce a more homogeneous deformation in Mg. The results showed that the addition of Li dramatically reduced the critical resolved shear stress of pyramidal (c+a) slip, facilitating easy and uniform deformation propagation and improving deformation homogeneity.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Nanoscience & Nanotechnology
Xinglong An, Yan Li, Song Ni, Zhangwei Wang, Min Song
Summary: The investigation of cold-rolled cobalt revealed that various deformation mechanisms were activated during the process, leading to grain refinement to the nano scale. The Vickers hardness tests indicated a stable strain hardening process throughout the cold rolling process.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Xiao-Zhi Tang, Ya-Fang Guo
Summary: The interaction between lattice dislocation and non-shearable precipitates has been well explained by the Orowan bypass mechanism, but there is a lack of information on how a twinning dislocation behaves in the same scenario. Atomistic simulations capture the bowing and bypassing of a twinning dislocation impeded by impenetrable obstacles, and show that the measured Orowan stress significantly deviates from classic theory predictions, suggesting an overestimation of Orowan stress for twinning dislocations due to the line tension approximation.
Article
Nanoscience & Nanotechnology
Zichen Wei, Lin Zhang, Xingyu Li, Ying Long, Xuanhui Qu
Summary: The study found that the deformation behavior of rhenium is highly sensitive to grain size, with non-basal slip and extension twins being the dominant deformation modes in samples with large grain sizes. As grain size decreases, the deformation behavior gradually transitions from non-basal slip-dominated flow to basal slip-dominated flow.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Tianjiao Li, Jiang Zheng, Haoge Shou, Rong Shi, Yongfa Zhang, Guilan Wen, Kang Huang, Dongdi Yin, Jinsong Rao
Summary: This study quantitatively and statistically investigated the effects of 3% Y addition on the deformation modes and transferability of Mg sheets during strain-controlled tension-compression low-cycle fatigue at room temperature. The results showed that Mg-3Y alloy exhibited enhanced activity of various slip systems and lower twinning-detwinning activity compared to pure Mg, and it had a higher likelihood of slip transfer.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Mathematics, Applied
Zi-Han Xu, Lin Zhan, Si-Yu Wang, Hui-Feng Xi, Heng Xiao
Summary: A new finite strain J(2)-flow model of von Mises type is proposed to address unresolved issues regarding simultaneous simulation of realistic hardening and softening effects for metals. By presenting an accurate and explicit form of the yield strength function that automatically matches any given test data, solutions to these challenges are obtained.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2021)
Article
Nanoscience & Nanotechnology
Gyo Myeong Lee, Jong Un Lee, Sung Hyuk Park
Summary: In this study, the twinning and slip behaviors of pure Mg and Mg-1Gd extrudates during bending deformation were investigated. It was found that the Mg-1Gd extrudate exhibited better bendability compared to the pure Mg extrudate. The addition of Gd suppressed grain-boundary migration and promoted slip activity, resulting in higher bending yield strength and failure bending strain.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Tian Ye, Feng Zhao, Lianyang Chen, Kun Jiang, Qiong Deng, Yuzeng Chen, Qingyuan Wang, Tao Suo
Summary: TWIP steel shows high strain hardening capability and strength under extreme conditions, but significant ductility loss due to twin structure and its evolution, strain rate, and temperature. The interactions between twin systems and nanotwin structures accelerate crack nucleation and propagation along twin boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
I. Kireeva, A. A. Saraeva, A. V. Vyrodova, Y. Chumlyakov
Summary: The kinetics of precipitation hardening of the (CoCrFeNi)94Ti2Al4 high-entropy alloy at 1073 K was studied during tension along [001] and [144] orientations. It was found that the critical resolved shear stresses (CRSS) began to depend on crystal orientation at high deforming stresses, and different fracture modes were observed in crystals oriented along [144] and [001].
Article
Materials Science, Multidisciplinary
Qingqing Wang, Chaoyang Niu, Zhanqiang Liu, Yanqing Wang, Yanhai Cheng, Yongkang Cui
Summary: The hardening mechanisms of deformation twins in the machined surface of Ti-6Al-4V alloy were investigated. It was found that increasing cutting speeds led to different levels of grain refinement and the generation of nano twins. Both grain refinement and nano twins caused inhomogeneous hardening in the machined surface of Ti-6Al-4V.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Xiaoliang Ji, Lihua Wang, Yiping Xia, Fu Guo, Chunqing Wang
Summary: Previous research on high-symmetric metallic materials has shown that the introduction of twins can overcome the trade-off between strength and ductility. However, it was uncertain if this pathway would be valid for metals with a low-symmetry crystal structure. In this study, the low-symmetry body-centered tetragonal Sn achieved a simultaneous enhancement in tensile ductility and strength at 77 K through pre-twinning combined with room-temperature self-recrystallization. In-situ tensile experiments revealed that deformation twins, dynamic recrystallization, and multiple dislocation planar slip contributed to the improvement of cryogenic mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Instruments & Instrumentation
J. Immoor, H. Marquardt, L. Miyagi, S. Speziale, S. Merkel, I. Schwark, A. Ehnes, H. -P. Liermann
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Chemistry, Physical
Huijeong Hwang, Taehyun Kim, Hyunchae Cynn, Thomas Vogt, Rachel J. Husband, Karen Appel, Carsten Baehtz, Orianna B. Ball, Marzena A. Baron, Richard Briggs, Maxim Bykov, Elena Bykova, Valerio Cerantola, Julien Chantel, Amy L. Coleman, Dana Dattlebaum, Leora E. Dresselhaus-Marais, Jon H. Eggert, Lars Ehm, William J. Evans, Guillaume Fiquet, Mungo Frost, Konstantin Glazyrin, Alexander F. Goncharov, Zsolt Jenei, Jaeyong Kim, Zuzana Konopkova, Jona Mainberger, Mikako Makita, Hauke Marquardt, Emma E. McBride, James D. McHardy, Sebastien Merkel, Guillaume Morard, Earl F. O'Bannon, Christoph Otzen, Edward J. Pace, Alexander Pelka, Charles M. Pepin, Jeffrey S. Pigott, Vitali B. Prakapenka, Clemens Prescher, Ronald Redmer, Sergio Speziale, Georg Spiekermann, Cornelius Strohm, Blake T. Sturtevant, Nenad Velisavljevic, Max Wilke, Choong-Shik Yoo, Ulf Zastrau, Hanns-Peter Liermann, Malcolm McMahon, R. Stewart McWilliams, Yongjae Lee
Summary: The ultrafast synthesis of epsilon-Fe3N1+x from Fe and N-2 under high pressure using XFEL was observed, demonstrating the exploration of time-dependence of reactions under high-pressure conditions by coupling intense X-ray exposures with the source time structure.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Instruments & Instrumentation
H. P. Liermann, Z. Konopkova, K. Appel, C. Prescher, A. Schropp, V Cerantola, R. J. Husband, J. D. McHardy, M. McMahon, R. S. McWilliams, C. M. Pepin, J. Mainberger, M. Roeper, A. Berghaeuser, H. Damker, P. Talkovski, M. Foese, N. Kujala, O. B. Ball, M. A. Baron, R. Briggs, M. Bykov, E. Bykova, J. Chantel, A. L. Coleman, H. Cynn, D. Dattelbaum, L. E. Dresselhaus-Marais, J. H. Eggert, L. Ehm, W. J. Evans, G. Fiquet, M. Frost, K. Glazyrin, A. F. Goncharov, H. Hwang, Zs Jenei, J. Y. Kim, F. Langenhorst, Y. Lee, M. Makita, H. Marquardt, E. E. McBride, S. Merkel, G. Morard, E. F. O'Bannon, C. Otzen, E. J. Pace, A. Pelka, J. S. Pigott, V. B. Prakapenka, R. Redmer, C. Sanchez-Valle, M. Schoelmerich, S. Speziale, G. Spiekermann, B. T. Sturtevant, S. Toleikis, N. Velisavljevic, M. Wilke, C. S. Yoo, C. Baehtz, U. Zastrau, C. Strohm
Summary: The high-precision X-ray diffraction setup for diamond anvil cells at the European XFEL High Energy Density instrument is described, including beamline optics, sample positioning, and detector systems in the multipurpose vacuum chamber. Concepts for pump-probe X-ray diffraction experiments in the DAC are discussed and demonstrated through X-ray heating and diffraction of Bi under pressure. The results are interpreted using finite element modeling of the sample chamber in the DAC.
JOURNAL OF SYNCHROTRON RADIATION
(2021)
Article
Geochemistry & Geophysics
Sabrina Tecklenburg, Roberto Colina-Ruiz, Sovanndara Hok, Cynthia Bolme, Eric Galtier, Eduardo Granados, Akel Hashim, Hae Ja Lee, Sebastien Merkel, Benjamin Morrow, Bob Nagler, Kyle Ramos, Dylan Rittman, Richard Walroth, Wendy L. Mao, Arianna E. Gleason
Summary: The study examined natural kamacite samples from the Gibeon meteorite to investigate phase transition kinetics under shock compression up to 140 GPa. It found that the hcp phase rapidly formed at maximum compression and persisted for up to 9.5 ns. The work provides insights into the dynamic material properties of metallic planetary bodies and Earth's core elasticity during impact events.
Article
Physics, Multidisciplinary
Sebastien Merkel, Sovanndara Hok, Cynthia Bolme, Dylan Rittman, Kyle James Ramos, Benjamin Morrow, Hae Ja Lee, Bob Nagler, Eric Galtier, Eduardo Granados, Akel Hashim, Wendy L. Mao, Arianna E. Gleason
Summary: Through ultrafast experiments, the plasticity behavior of hexagonal-close-packed iron under extreme loading states was studied. The results show that {101 over bar 2} deformation twinning controls the microstructures of polycrystalline iron at high strain rates and occurs within 1 ns.
PHYSICAL REVIEW LETTERS
(2021)
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
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
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
Mineralogy
Jeffrey P. Gay, Lowell Miyagi, Samantha Couper, Christopher Langrand, David P. Dobson, Hanns-Peter Liermann, Sebastien Merkel
Summary: The deformation, phase transformation, and texture development of the perovskite analogue NaCoF3 were studied under high pressure and high temperature conditions. A phase transition from perovskite to post-perovskite was observed between 20.1 and 26.1 GPa, accompanied by a decrease in stress. X-ray diffraction was used to monitor the crystal structure and texture, providing insights into microstructure development in the Earth's mantle.
EUROPEAN JOURNAL OF MINERALOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
A. Zadoya, A. M. Arevalo-Lopez, J. Sanchez-Benitez, M. Huve, J-F Blach, S. Merkel, N. Hilairet, J. Chantel, M. Colmont
DALTON TRANSACTIONS
(2020)