Article
Geochemistry & Geophysics
Leif Tokle, Greg Hirth
Summary: The relationship between recrystallized grain size and stress in quartz aggregates is influenced by c-axis fabric, with prism c-axis fabrics associated with larger grain sizes. Changes in dislocation creep flow law are also observed with different c-axis fabrics. The wattmeter model accurately predicts the recrystallized grain size versus stress relationships in quartzite samples with added water, indicating its potential for investigating stress state and grain size evolution in quartz-rich rocks.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Chao Qi, Yong-Hong Zhao, Mark E. Zimmerman, Daeyeong Kim, David L. Kohlstedt
Summary: Experimental study on olivine samples with different iron contents reveals a transition in crystallographic preferred orientation and an increase in radial seismic anisotropy with increasing strain. Recrystallized grain size decreases inversely with stress and increases with increasing iron content. This research contributes to understanding the microstructural evolution in the mantle of both Earth and Mars.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Rishav Mallick, Valere Lambert, Brendan Meade
Summary: Viscoelastic processes in the upper mantle play a crucial role in redistributing seismic stresses and modulating crustal deformation throughout the earthquake cycle. Geodetic observations of these processes offer valuable insights into the rheological behavior of the upper mantle. Simplified representations of viscoelastic deformation during the aseismic phase of the earthquake cycle should account for both rapid postseismic deformation and late-cycle strain localization.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Review
Engineering, Manufacturing
Tao Zhang, Feng Jiang, Hui Huang, Jing Lu, Yueqin Wu, Zhengyi Jiang, Xipeng Xu
Summary: This paper reviews the brittle-ductile transition (BDT) in extreme manufacturing, analyzes the factors affecting it, and discusses the mechanisms behind it. It suggests that the competition between plastic deformation and crack propagation determines the transition between brittleness and ductility. The brittleness or ductility of the machined material should be regulated by deformation scale, deformation temperature, and machining speed to benefit specific manufacturing processes.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2021)
Article
Chemistry, Physical
Jiaao Liu, Weihong Zhang, Xin Xin, Leiwen Wang, Chongwei Zhu, Xuhui Zhu, Wenru Sun
Summary: The hot deformation behavior of Haynes 214 superalloy was investigated, showing that temperature and strain rate significantly influence dynamic recrystallisation, as well as the fraction of Sigma 3 twin boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
S. M. Fatemi, S. Kheyrabadi, H. Paul
Summary: The deformation behavior and microstructural evolutions of a rolled AZ31 magnesium alloy with and without pre-existing extension twins were studied. The initial texture was found to not only influence the evolution of flow stress, but also change the size and fraction of recrystallized grains. Pre-existing twins were found to reduce the anisotropy of the material.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Chemistry, Physical
Jiaao Liu, Weihong Zhang, Xin Xin, Leiwen Wang, Chongwei Zhu, Xuhui Zhu, Wenru Sun
Summary: The microstructure evolution and dynamic recrystallisation behavior of Haynes 214 superalloy were investigated under different deformation temperatures and strain rates. The results showed that temperature and strain rate have significant effects on the hot deformation behavior of Haynes 214 alloy. The fraction and grain size of dynamic recrystallisation increase with increasing deformation temperature. Fine and uniform dynamic recrystallisation grains are obtained at low and high strain rates, while the grain size and fraction decrease at a strain rate of 1 s(-1). Continuous and discontinuous dynamic recrystallisation occur during hot deformation and are influenced by strain rate and deformation temperature. The fraction of Sigma 3 (n) (n = 1, 2, 3) twin boundary increases with temperature and is higher at lower and higher strain rates, but lower at an intermediate strain rate of 1 s(-1).
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Xin Wang, Dikai Guan
Summary: The nucleation and grain growth of 34 coarse grains were tracked using a quasi-in-situ EBSD method. Most grains did not have a basal orientation, and no preferential grain growth or special types of grain boundaries were observed. Nine coarse grains nucleated from deformed grain boundaries, mainly within dislocation cells or subgrains in deformed grain interiors. The growth behavior of these grains can be explained by abnormal subgrain growth rarely reported in Mg alloys. The coarse basal grains did not show any growth advantage compared to other non-basal grains, resulting in a weak basal texture in the AZ31B alloy.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Peng Zhang, Ling Yan, Xueliang Shang, Guanglong Li, Xiangyu Qi, Pengcheng Liu, Boyong Li, Xuemin Wang, Xiangyu Xu, Chengjia Shang
Summary: The hot-working behavior and microstructure characteristics of high-Mn austenitic steel were studied under different deformation conditions using a compression test and electron backscatter diffraction. The results showed that a peak stress appeared in the stress-strain curve under different deformation conditions, which conformed to the traditional dynamic recrystallization hot-working flow stress curve. A constitutive equation was established to predict the peak stress. The microstructure analysis showed that the orientation texture of the deformed grains was primarily composed of <110> and <100>. The main recrystallization mechanism was discontinuous dynamic recrystallization. The grain size of the discontinuous dynamic recrystallization grains tended to increase with increasing deformation temperature or decreasing strain rate. Processing maps were drawn based on the dynamic material model, providing guidance for optimizing process parameters in industrial production.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Peng Wan, Tao Kang, Feng Li, Pengfei Gao, Lei Zhang, Zhengzhi Zhao
Summary: The low-density high-strength Fe-Mn-Al-C steel exhibits negative temperature sensitivity and positive strain rate sensitivity during hot deformation. The dynamic recrystallization behavior is characterized by introducing the ZenerHollomon parameter, which determines the critical strain/stress, peak strain/stress, and steady-state strain/stress models. The optimal hot working conditions for obtaining fine and uniform grain structure are identified, with a prediction model for dynamic recrystallization average grain size showing high accuracy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Review
Materials Science, Multidisciplinary
Samuel J. Galpin
Summary: This critical review discusses seven microstructure phenomena that occur during thermomechanical processing of safety-critical components used in jet engines, aiming to address the poorly understood effects of manufacturing conditions on the microstructure evolution of Ni-based superalloys. Gaps of understanding in microstructure evolution were identified through graphical representation and recommendations for further study were provided.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Lin Qian, Xie Pu-Chu, Hu Jian-Bo, Zhang Feng-Guo, Wang Pei, Wang Yong-Gang
Summary: The study investigates the effects of grain size and loading stress on the mechanical response and damage evolution of high-purity copper spallation through numerical simulation. The results reveal the influence of grain size on various parameters and the critical role of tensile stress peak in the damage zone.
ACTA PHYSICA SINICA
(2021)
Article
Geochemistry & Geophysics
Jean Furstoss, Carole Petit, Clement Ganino, Marc Bernacki, Daniel Pino-Munoz
Summary: This paper introduces a new mesoscopic full field approach for modeling microstructural evolutions and mechanical behavior of olivine aggregates. The study shows that both fine-grained and crystallographic textured pre-existing bands favor strain localization, emphasizing the importance of these microstructural characteristics on the mechanical behavior of the aggregate.
Article
Materials Science, Multidisciplinary
C. Degueldre, R. J. Wilbraham, J. Fahy, S. M. Green
Summary: The study investigates the secondary recrystallisation and abnormal grain growth behavior in a specific stainless steel alloy pinned by nano-particles under certain stress and annealing conditions. Tests were conducted to examine the effect of grain size distributions and growth models with changes in time and temperature. It is suggested that a more precise analysis of grain and nano-particle sizes is essential for an accurate evaluation of incubation time, along with further research and development work to apply the model and prevent secondary grain growth.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Guangda Zhao, Ye Cui, Yang Zhang, Xinghao Li, Lixin Sun, Zhongwu Zhang
Summary: Polycrystalline FeMnAlNi-based alloys exhibit poor pseudoelasticity due to grain constraint, but their pseudoelasticity can be improved by increasing grain size through directional recrystallization (DR). The study investigates the effect of DR parameters on columnar grain size and growth mechanisms, and the results show that FeMnAlNiCo shape memory alloys (SMAs) can achieve large grain sizes above 20 mm and even exceed 50 mm through DR. The work provides important guidance for microstructural control in FeMnAlNi-based SMAs.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Geology
Andrew J. Cross, Greg Hirth, David J. Prior
Article
Geosciences, Multidisciplinary
A. J. Cross, D. J. Prior, M. Stipp, S. Kidder
GEOPHYSICAL RESEARCH LETTERS
(2017)
Article
Geochemistry & Geophysics
A. J. Cross, P. Skemer
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2017)
Article
Geochemistry & Geophysics
Sam Webber, Susan Ellis, Ake Fagereng
EARTH AND PLANETARY SCIENCE LETTERS
(2018)
Article
Geology
S. Webber, K. P. Norton, T. A. Little, L. M. Wallace, S. Ellis
Article
Geosciences, Multidisciplinary
Laura M. Wallace, Sigrun Hreinsdottir, Susan Ellis, Ian Hamling, Elisabetta D'Anastasio, Paul Denys
GEOPHYSICAL RESEARCH LETTERS
(2018)
Article
Geosciences, Multidisciplinary
Philip M. Barnes, Francesca C. Ghisetti, Susan Ellis, Julia K. Morgan
Article
Geosciences, Multidisciplinary
W. M. Kissling, P. Villamor, S. M. Ellis, A. Rae
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2018)
Article
Geosciences, Multidisciplinary
Adam Beall, Ake Fagereng, Susan Ellis
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Geochemistry & Geophysics
A. J. Cross, P. Skemer
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geochemistry & Geophysics
Andrew J. Cross, Elizabeth Olree, Helene Couvy, Philip Skemer
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Materials Science, Multidisciplinary
Sheng Fan, David J. Prior, Andrew J. Cross, David L. Goldsby, Travis F. Hager, Marianne Negrini, Chao Qi
Summary: This study proposes grain boundary irregularity as a means of distinguishing between recrystallized and remnant grains, and analyzes the relationship between grain boundary irregularity and sphericity parameter Psi using experimental data. The similar grain boundary migration rates at high and low temperatures suggest a balance between boundary mobility and driving force influencing the migration rate.
Article
Geochemistry & Geophysics
Sheng Fan, David J. Prior, Travis F. Hager, Andrew J. Cross, David L. Goldsby, Marianne Negrini
Summary: Kinking is an important process during crystal plastic deformation and may influence the mechanical properties of the Earth's lithosphere and planetary cryosphere. Microstructural analyses of deformed ice samples show that kinking and dynamic recrystallization both play a role in grain nucleation, depending on the crystallographic orientations of individual grains.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
A. J. Cross, D. L. Goldsby, T. F. Hager, I. B. Smith
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Geochemistry & Geophysics
S. Ellis, R. Van Dissen, D. Eberhart-Phillips, M. Reyners, J. F. Dolan, A. Nicol
EARTH AND PLANETARY SCIENCE LETTERS
(2017)