Article
Materials Science, Multidisciplinary
Le Chang, Zihao Miao, Binbin Zhou, Changyu Zhou, Xiaohua He
Summary: The anisotropic tensile deformation mechanisms of commercially pure titanium (CP-Ti) along rolling direction (RD) and transverse direction (TD) are revealed through the statistical analysis of electron back scattered diffraction (EBSD) data and crystal plasticity (CP) simulations. The analysis of texture evolution, misorientation angle distribution, in-grain misorientation axis (IGMA), and Schmid factor indicates that the anisotropic tensile deformation behavior is due to the anisotropic slip modes. Further crystal plasticity simulation results confirm this conjecture and reveal that the higher fraction of basal slip accommodates the deformation and leads to lower strain hardening behavior along TD. The lower uniform elongation along TD is caused by the heterogeneous strain distribution in the microstructure as deduced from digital image correlation (DIC) results and kernel average misorientation (KAM) maps.
Article
Engineering, Mechanical
Ming-fei Li, Yan-hua Zhou, Peng-wei Wang, Babafemi Malomo, Liang Yang
Summary: This study investigates the deformation behavior of Zr2Cu metallic glass at ambient and low temperature states by molecular dynamics simulations. The results show that the elastic-plastic properties of the material increase with decreasing temperature, leading to enhanced ductility. The formation of densely-packed structures at low temperatures contributes to the improved mechanical performance.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Geochemistry & Geophysics
Harison S. Wiesman, Mark E. Zimmerman, David L. Kohlstedt
Summary: To study the microstructural evolution of polymineralic rocks, deformation experiments were performed on two-phase aggregates of olivine (Ol) + ferropericlase (Per) with varying periclase fractions (f(Per)). Single-phase samples of Ol and Per were also deformed for comparison. Analysis of the microstructural developments using electron backscatter diffraction (EBSD) revealed differences in grain size and crystalline texture between single- and two-phase samples. Grain size increased in single-phase samples but remained unchanged or decreased in two-phase samples, indicating the influence of phase-boundary pinning. Crystallographic preferred orientations were stronger in single-phase materials compared to two-phase materials.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Nanoscience & Nanotechnology
Yanxi Li, Pengfei Gao, Mei Zhan, Xueqi Jiang
Summary: Understanding the heterogeneous deformation and damage at the mesoscale is important for improving the mechanical properties of polycrystalline aggregates. In this study, a damage-coupled crystal plasticity finite element model was developed to investigate the deformation and damage behavior of a tri-modal microstructure in TA15 Ti-alloy. Experimental tests and numerical simulations revealed that the heterogeneous deformation was primarily caused by the alpha phases, leading to four types of damage.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
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
Geochemistry & Geophysics
Jianfeng Li, Tongbin Shao, Maoshuang Song, Hao Wang
Summary: Through experiments and analysis, different deformation mechanisms and corresponding flow behaviors of Fangshan dolomite at different temperatures were identified, including low-temperature plasticity, dislocation creep, and a transition regime. The results indicate that the dominance of dislocation creep deformation in dolomite at high temperatures is limited to conditions of high temperature and high stress.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Materials Science, Multidisciplinary
Aman Gupta, Rajesh Kisni Khatirkar, Amit Kumar, Khushahal Sunil Thool, Nitish Bhibhanshu, Satyam Suwas
Summary: This study systematically investigated microstructure evolution and texture development during cold rolling of a Ti15333 alloy. It was found that an increase in cold-rolling reduction led to changes in crystallographic texture and grain morphology, with both alpha and gamma fibers observed in the cold-rolled samples. The simulated texture was reasonably well predicted quantitatively using the VPFFT model, with an intensification of the gamma-fiber and alpha-fiber texture observed in the general texture evolution.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Engineering, Mechanical
Qinglei Zeng, Manxi Chen, Xiaoqi Yu, Wei Qi, Shengxin Zhu, Heng Yang, Hao-Sen Chen
Summary: Adiabatic shear band (ASB) is an important failure mechanism observed in metals and alloys under impact loading, with a two-dimensional propagating feature. However, in-situ characterization of temperature-deformation fields during ASB formation is challenging due to the small scales involved. In this study, a plane-array infrared imaging system and microspeckle-based digital image correlation technique were used to obtain the two-dimensional features of ASB evolution in titanium alloy specimens. Experimental characterization and simulation results were used to analyze the thermo-mechanical aspects of ASB formation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Multidisciplinary Sciences
Jingyuan Yan, Sheng Yin, Mark Asta, Robert O. Ritchie, Jun Ding, Qian Yu
Summary: This study investigates the influence of compositional heterogeneity in high-entropy alloys (HEAs) on their mechanical properties. The results show that, as the sample size decreases below a certain threshold, a transition in the mechanical properties of HEAs occurs due to the size effect of compositional heterogeneity.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Balint Boldizsar, Peter Jenei, Anwar Q. Ahmed, Maxim Yu Murashkin, Ruslan Z. Valiev, Nguyen Q. Chinh
Summary: The study found that the ultrafine-grained alloy exhibited super ductility in the low temperature range, with relatively high strain rate sensitivity and low activation energy.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Physics, Applied
Matthew Nelms, Jonathan Lind, Jonathan Margraf, Sayyad Basim Qamar, Joshua Herrington, Andrew Robinson, Mukul Kumar, Nathan Barton
Summary: The science and engineering communities have a strong interest in experimental platforms to assess and enhance dynamic material deformation models. Although well-developed platforms already exist, there are still gaps to fill for strain and strain rate conditions encountered during impact and other high-rate loading scenarios. A recently developed platform addresses one such gap by utilizing in situ x-ray imaging to measure the transient closure of a cylindrical hole, allowing access to high strain rate and large strain conditions. In this study, further refinements were made to minimize the potential effects of porosity and anelasticity on the measurements, thereby isolating the strength effects for experimentation. The updated experimental setup employs a two-layer flyer design and elongated target to reduce tensile excursions associated with rarefaction wave interactions and enables direct assessment of commonly used strength models for dynamic metal simulations. The technique was applied to well-characterized tantalum material, establishing a robust connection to other experimental techniques. Additionally, simulations were conducted to explore potential deformation localization behavior using a sub-zone treatment of shear banding. Overall, an improved experimental configuration was developed and utilized to isolate strength effects in a wider range of materials.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Geochemistry & Geophysics
Tongzhang Qu, Ian Jackson, Ulrich H. Faul
Summary: This study experimentally investigated the seismic properties of olivine and orthopyroxene in the mantle, highlighting the significant role of orthopyroxene in the shallow parts of the mantle. The findings suggest that adjustments to the shear modulus and dissipation of high-temperature mantle olivine are needed to accommodate the contribution of orthopyroxene.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Materials Science, Multidisciplinary
Paul Baral, Andrey Orekhov, Ralf Dohmen, Michael Coulombier, Jean Pierre Raskin, Patrick Cordier, Hosni Idrissi, Thomas Pardoen
Summary: The study reveals that amorphous olivine thin films deposited by pulsed laser deposition exhibit viscoelastic-viscoplastic behavior with significant rate dependency, suggesting a complex out-of-equilibrium structure. The ambient temperature creep behavior of the amorphous olivine films differs significantly from single crystal olivine, which is related to the activation of grain boundary sliding in polycrystalline olivine following grain boundary amorphization under high-stress conditions.
Article
Nanoscience & Nanotechnology
Guoxiang Yu, Dingxuan Zhao, Keer Li, Wei Chen, Jinyu Zhang, Jixiong Liu, Rui Li, Xiaoxiang Wang, Jun Sun
Summary: By combining heat treatment and thermomechanical processing, it is possible to create homogeneous precipitates in high-strength metastable fl-titanium alloys, thereby enhancing their plasticity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Geochemistry & Geophysics
Haipeng Luo, Kelin Wang
Summary: This study investigates the complexities of vertical deformation following subduction earthquakes. The results show that most megathrust earthquakes exhibit a three-segment, long-wavelength pattern of uplift and subsidence, controlled by coseismic fault slip. Afterslip, on the other hand, leads to site-specific and heterogeneous vertical deformation, but can be adequately modeled using a simple elastic model. This research has important implications for understanding the mechanism of afterslip and interpreting coastal paleoseismic records.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)