Article
Materials Science, Multidisciplinary
Vladimir V. V. Stolyarov
Summary: Although the Bauschinger effect has been extensively studied, little research has been conducted on its relation to grain size, especially in nanostructured materials. This study investigated the Bauschinger effect in commercially pure hcp titanium and fcc copper with varying grain sizes. The results showed that the Bauschinger effect increases with decreasing grain size, permanent strain, and exposure time between forward and reverse deformation. Furthermore, the Bauschinger parameter exhibited opposite signs in copper and titanium, indicating different strain hardening and softening behaviors in these materials.
Article
Materials Science, Multidisciplinary
Zhenbang Wei, Jinxin Yu, Yong Lu, Jiajia Han, Cuiping Wang, Xingjun Liu
Summary: This study developed a diffusion activate energy model based on machine-learning methods, starting with the establishment of T-m and C-ij models, followed by the development of a Q model and feature selection to optimize the model. The predictive ability and goodness of fit of the models were successfully validated in the study.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Tong Wu, Mingzi Sun, Hon Ho Wong, Bolong Huang
Summary: Understanding the phase transition during crystal growth is crucial for the future development of functional nanomaterials. This study presents a detailed operational strategy for facet control and phase transition within transition metal lattices, providing a key reference for experimental synthesis and facet control. The research offers insights into the phase change and its influence on electrocatalysis, paving the way for practical phase control and modification of transition metals in various applications.
Article
Physics, Multidisciplinary
Shiduo Sun, Dongwei Li, Chenpeng Yang, Libo Fu, Deli Kong, Yan Lu, Yizhong Guo, Danmin Liu, Pengfei Guan, Ze Zhang, Jianghua Chen, Wenquan Ming, Lihua Wang, Xiaodong Han
Summary: Metals usually exhibit one crystal structure, but this study shows that bending can cause fcc-structured Ag to access all three crystal structures. The complete process of transitioning from fcc to bcc, hcp, and finally re-oriented fcc structure was observed in situ.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
M. T. Beason, B. J. Jensen, S. D. Crockett
Summary: Experimental investigation on high-temperature and high-pressure response of magnesium revealed the phase transition and incipient melt points, with the elastic properties and sound speeds used to determine the behavior. Results showed two distinct responses based on peak stress levels, forming separate lines on a stress-energy phase diagram that intersected key phase transitions. The development of a multiphase equation of state placed the melt boundary at a lower pressure than previously reported static measurements.
Article
Nanoscience & Nanotechnology
Wenqing Yang, Jiasi Luo, Hui Fu, Chi Fai Cheung, Haihui Ruan, Xu-Sheng Yang
Summary: In this paper, cold rolling and different annealing temperatures were applied to the as-cast TiZrHfTa0.5 alloy. The study found that the most bcc -> hcp phase transition occurred in the cold-rolled plus 870 degrees C-annealed specimens. Atomic-scale observations revealed that this phase transition was further activated in the self-organized gradient worn subsurface, where a dual-phase structure with increased hcp phase fraction accommodated the sliding-caused plasticity.
SCRIPTA MATERIALIA
(2022)
Article
Multidisciplinary Sciences
Tianyuan Xiao, Yasutaka Nagaoka, Xirui Wang, Tian Jiang, Derek LaMontagne, Qiang Zhang, Can Cao, Xizheng Diao, Jiahua Qiu, Yiruo Lu, Zhongwu Wang, Y. Charles Cao
Summary: This study investigates the ambient metastability of the rock-salt phase in well-defined nanocrystal systems and proposes general rules for transformation-barrier engineering, which are important for the rational design of next-generation materials.
Article
Engineering, Mechanical
Hao Zhang, Bingqiang Wei, Xiaoqin Ou, Song Ni, Hongge Yan, Min Song
Summary: This study investigated the mechanisms of HCP to FCC structure transition and its inverse transition in pure titanium through experiments and simulations. The HCP<->FCC phase transition at the twin tip was experimentally observed for the first time. MD simulations revealed that this reversible phase transition was caused by successive slip of Shockley partial dislocations. Furthermore, the study discovered the periodic serrated feature and evolution of the twin tip interface structure.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Multidisciplinary Sciences
Yindong Fang, Peter K. Galenko, Dongmei Liu, Klaus Hack, Markus Rettenmayr, Stephanie Lippmann
Summary: The thermodynamic description of the fcc phase in the Al-Cu system has been revised to predict metastable fcc/liquid phase equilibria. Experimental and modeling results were used to determine solidus and liquidus concentrations and to validate the new description. The methodology can be applied to other alloy systems.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
Georgiy K. Ozerov, Dmitry S. Bezrukov, Alexei A. Buchachenko
Summary: This study presents a comprehensive computational analysis of the stable accommodations of an atom in two different types of lattices. The results can be useful for a qualitative interpretation of atomic matrix isolation experiments.
Article
Materials Science, Multidisciplinary
Yuchen Wang, Changjun Wu, Ya Liu, Mengyun Tian, Xiaowang Lu, Xuping Su
Summary: The presence of HCP phase in FCC-type high-entropy alloys can enhance their mechanical properties, which is usually induced by deformation. In this study, CoxCrFeMnNi2-x alloys were investigated after vacuum treatment, and it was observed that FCC to HCP transition occurred during cooling for alloys with x ≥ 1.5. The volume fraction of HCP phase increased with Co content, but HCP phase was not stable above 600°C. Experimental tests showed that the Co1.75CrFeMnNi0.25 alloy had a microhardness of 213 HV due to the substantial HCP phase present, significantly higher than other non-HCP-containing alloys. These findings offer guidance for designing FCC-type high-entropy alloys with desirable mechanical properties through HCP phase strengthening.
Article
Nanoscience & Nanotechnology
Priyanshi Agrawal, Saket Thapliyal, Priyanka Agrawal, Abhijeet Dhal, Ravi Sankar Haridas, Sanya Gupta, Rajiv S. Mishra
Summary: A paradigm shift in the composition of high entropy alloys (HEAs) has provided new opportunities for microstructural engineering, particularly in laser powder bed fusion (LPBF) additive manufacturing (AM) which allows for fine-tuning of microstructures. This study focused on the microstructural evolution of a metastable dual phase HEA during LPBF AM and established a processing window for the alloy. The microstructure of the alloy was governed by the LPBF process parameters, which influenced the final phase fraction and metastability alteration. Additionally, the study observed variations in stacking fault morphology and nanomechanical behavior of the alloy with changes in process parameters.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Maojie Lin, Liang Hu, Ruilin Xiao, Xiannian Zhu, Pengxu Yan, Bingbo Wei
Summary: A transition in dendrite growth kinetics from stable hcp phase to metastable fcc phase was observed in a refractory Re95W5 alloy in an electrostatic levitation state. The growth velocity of dendrites displayed a power-law relationship with the degree of undercooling. Once the undercooling exceeded 867 K, metastable fcc dendrites grew primarily from the liquid phase, followed by a complete solid-state transformation from fcc to hcp phase. This transition resulted in a drastic decrease in the dendrite growth velocity.
PHILOSOPHICAL MAGAZINE LETTERS
(2023)
Article
Chemistry, Physical
Ignacio Sanchez-Burgos, Eduardo Sanz, Carlos Vega, Jorge R. Espinosa
Summary: The computational characterization of polymorphic nucleation competition between face-centered cubic (fcc) and hexagonal-close packed (hcp) hard-sphere crystal phases was conducted, revealing that the hcp phase may have a slightly higher interfacial free energy than the fcc phase, leading to a decreased propensity to nucleate from the liquid. The abundance of each polymorph in grown crystals from different types of nuclei and the maintenance of polymorphic structure in post-critical crystals were also analyzed, providing insights into the intricate puzzle of colloidal hard-sphere crystallization.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Yuhao Wu, Baorong Zhu, Jingwen Su, Zhiming Gao, Xing Zhao
Summary: The influences of cooling style on the kinetics of metastable phase separation in undercooled liquid Fe35Cu65 alloy were systematically investigated. Results showed that the phase separation time increased linearly with the undercooling, and the morphology changed as well. Under forced cooling condition, a larger critical undercooling was required to form the core-shell separation morphology, and the phase separation time was shorter. The theoretical analyses were confirmed by numerical simulations and experiments.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
J. Immoor, L. Miyagi, H-P Liermann, S. Speziale, K. Schulze, J. Buchen, A. Kurnosov, H. Marquardt
Summary: Cubic CaSiO3 perovskite is a weak phase at lower mantle temperatures and its strength and viscosity are lower than other lower mantle phases. These findings suggest that cubic CaSiO3 perovskite governs the dynamics of subducting slabs and provides a mechanism for separating subducted oceanic crust from the underlying mantle.
Article
Instruments & Instrumentation
Saiana Khandarkhaeva, Timofey Fedotenko, Alena Krupp, Konstantin Glazyrin, Weiwei Dong, Hanns-Peter Liermann, Maxim Bykov, Alexander Kurnosov, Natalia Dubrovinskaia, Leonid Dubrovinsky
Summary: The success of high-pressure research relies on the inventive design of pressure-generating instruments and materials used for their construction. In this study, different shapes of anvils were prepared using focused ion beam technology and their efficiency was evaluated through Raman spectroscopy and synchrotron x-ray diffraction. It was found that all types of secondary anvils performed well up to 250 GPa pressure, and pairs of toroidally shaped secondary anvils showed enhanced pressure multiplication factor in double-stage DACs, making them promising for ultrahigh-pressure experiments.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Instruments & Instrumentation
R. J. Husband, J. Hagemann, E. F. O'Bannon, H-P. Liermann, K. Glazyrin, D. T. Sneed, M. J. Lipp, A. Schropp, W. J. Evans, Zs. Jenei
Summary: This study introduces an experimental platform capable of simultaneous X-ray imaging and diffraction of compressed samples, allowing for the determination of phase transitions and kinetic parameters. The technique shows great potential for various applications.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Geosciences, Multidisciplinary
Xinyang Li, Sergio Speziale, Monika Koch-Mueller, Rachel Jane Husband, Hanns-Peter Liermann
Summary: This study investigates the phase stability of Al-bearing superhydrous phase B (shy-B) and its impact on the water cycle in the deep Earth. It reveals that the incorporation of Al expands the stability range and allows the coexistence of phase D even at normal mantle geotherm conditions. The study highlights the importance of Al in dense hydrous magnesium silicates for understanding the water cycle.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
V. S. Minkov, S. L. Bud'ko, F. F. Balakirev, V. B. Prakapenka, S. Chariton, R. J. Husband, H. P. Liermann, M. Eremets
Summary: In recent years, the transition temperature Tc of hydrogen-rich compounds has significantly increased and is now close to room temperature. However, the high pressures required for stability of these materials limit experimental studies. While superconductivity in hydrides has mainly been explored through electrical transport measurements, the magnetic properties, an important characteristic of superconductors, have not been well defined. In this study, the authors developed SQUID magnetometry under extreme high-pressure conditions to investigate the superconducting parameters of Im-3m-H3S and Fm-3m-LaH10, two representative families of high-temperature superconducting hydrides.
NATURE COMMUNICATIONS
(2022)
Article
Instruments & Instrumentation
Weiwei Dong, Konstantin Glazyrin, Saiana Khandarkhaeva, Timofey Fedotenko, Jozef Bednarcik, Eran Greenberg, Leonid Dubrovinsky, Natalia Dubrovinskaia, Hanns-Peter Liermann
Summary: The metallic glass Fe0.79Si0.07B0.14 gaskets have been found to offer a stable sample environment in high-pressure X-ray diffraction experiments, even under compression exceeding 1 Mbar. These gaskets improve various aspects of megabar experiments and have a higher signal-to-noise ratio compared to conventional gaskets made of other materials.
JOURNAL OF SYNCHROTRON RADIATION
(2022)
Article
Geochemistry & Geophysics
A. S. J. Mendez, S. Stackhouse, V Trautner, B. Wang, N. Satta, A. Kurnosov, R. J. Husband, K. Glazyrin, H-P Liermann, H. Marquardt
Summary: The study reveals the elastic bulk modulus softening of (Mg,Fe)O ferropericlase across the iron spin crossover and its significant impact on the physical properties. Experimental and computational results show that the softening effect is sensitive to the distribution of iron in the ferropericlase structure. Mixed-spin (Mg,Fe)O dominates the lower mantle at depths below 1,000 km.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(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
Multidisciplinary Sciences
Christoph Otzen, Hanns-Peter Liermann, Falko Langenhorst
Summary: When impacted, quartz undergoes a sudden transformation into glass lamellae, known as planar deformation features (PDFs). PDFs are reliable indicators of impacts and play a crucial role in identifying catastrophic collisions like the Chicxulub impact in the Earth's record. However, there is still no consensus on the formation of PDFs. In this study, we present time-resolved in-situ synchrotron X-ray diffraction data of single-crystal quartz rapidly compressed in a dynamic diamond anvil cell. Our experiments provide evidence for the transformation of quartz into a metastable rosiaite-type high-pressure phase, and the collapse of this phase during decompression leads to amorphous lamellae similar to naturally shocked quartz.
NATURE COMMUNICATIONS
(2023)
Article
Geosciences, Multidisciplinary
Biao Wang, Johannes Buchen, Alba San Jose Mendez, Alexander Kurnosov, Giacomo Criniti, Hanns-Peter Liermann, Hauke Marquardt
Summary: The stishovite to post-stishovite phase transition in rocks in the Earth's lower mantle may modify the scattering of seismic waves. Compression experiments on sintered polycrystalline stishovite show that the phase transition shifts to lower pressures with increasing stress. The bulk modulus of sintered polycrystalline stishovite differs from single crystal measurements and decreases at the phase transition.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Viktoria E. Trautner, Stephen Stackhouse, Alice R. Turner, Paula Koelemeijer, D. Rhodri Davies, Alba San Jose Mendez, Niccolo Satta, Alexander Kurnosov, Hanns-Peter Liermann, Hauke Marquardt
Summary: This study presents the first experimental results on the spin crossover-induced bulk modulus softening at high temperatures in ferropericlase. The existence of spin crossover in the mantle is validated through theoretical calculations and synthetic seismic tomography models. The S-C correlation is found to be a suitable measure for detecting the presence of spin crossover in tomographic models and provides evidence for the presence of ferropericlase in the lower mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Correction
Multidisciplinary Sciences
V. S. Minkov, S. L. Bud'ko, F. F. Balakirev, V. B. Prakapenka, S. Chariton, R. J. Husband, H. P. Liermann, M. I. Eremets
NATURE COMMUNICATIONS
(2023)
Article
Instruments & Instrumentation
Minju Kim, Yong-Jae Kim, Yong Chan Cho, Sooheyong Lee, Seongheun Kim, Hanns-Peter Liermann, Yun-Hee Lee, Geun Woo Lee
Summary: The dynamic diamond anvil cell (dDAC) technique is a valuable tool for studying phase transitions. In this study, a real-time event monitoring system and an in-line ruby pressure measurement system were developed to simultaneously record physical quantities and pressure during dynamic compression. These systems provide complementary information and allow for detailed analysis of the kinetic pathways of phase transitions.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Multidisciplinary Sciences
Sakura Pascarelli, Malcolm McMahon, Charles Pepin, Olivier Mathon, Raymond F. Smith, Wendy L. Mao, Hanns-Peter Liermann, Paul Loubeyre
Summary: This article discusses the importance of studying matter under extreme conditions, including the use of high-brilliance X-ray beams to measure material properties at the microscopic level and methods such as static and dynamic compression to achieve extreme thermodynamic states. It also highlights the cross-fertilization between the static and dynamic communities and evaluates future opportunities.
NATURE REVIEWS METHODS PRIMERS
(2023)
