Article
Materials Science, Multidisciplinary
Peng Zhang, Han Wang, ShengJie Yao, ChuanJie Wang, Qiang Zhu, Gang Chen
Summary: The Cu-3 wt%Ag-0.5 wt%Zr materials were rolled using the same process at room and cryogenic temperatures, showing differences in material microstructure evolution and texture. The stable behavior of cryogenically rolled sheets differed from that of room temperature samples.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Reeju Pokharel, Bjorn Clausen, Daniel J. Savage, Jianzhong Zhang, Sven C. Vogel, Roberta Beal, James Valdez, Veronica Anghel, Donald W. Brown, George T. Gray III
Summary: Uniaxial compression tests were conducted on 99.9% pure polycrystalline ������-tin (Sn) at different strain rates and temperatures. The results showed that the strain rate and temperature have significant effects on the stress-strain response, microstructure evolution, and stress relaxation behavior. Neutron diffraction and electron backscatter diffraction were used to characterize the crystallographic structures and deformation mechanisms. Elastic-plastic self-consistent simulations were performed to understand the macroscopic behavior.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Kelvin Wong, Nicholas Armstrong
Summary: The complexity of collective dislocation behavior has led to the use of mesoscopic models, but there is no generally accepted method for transforming a deterministic model into a stochastic one. This study proposes a physically motivated method for deriving stochastic models that preserve the non-negativity of the dislocation density and ensure the desired physical bounds.
Article
Materials Science, Multidisciplinary
J. D. Gravell, S. Lee, S. Ryu, I Ryu
Summary: At micron and nanometer length scales, metals exhibit strong anisotropic behaviors. Three-dimensional dislocation dynamics simulations can be used to investigate the plasticity and microstructure evolution in metal micropillars of different orientations.
Article
Materials Science, Multidisciplinary
Shipeng Wang, Ang Xiao, Yuhong Lin, Xiaohui Cui, Xiaoming Sun
Summary: This study investigates the effects of induced current on the properties of rolled 5052 aluminum alloy. The results show that the material's tensile strength, yield strength, and elongation are significantly improved after induction current treatment. In addition, the treatment alters the plasticity characteristics, grain structure, and texture strength of the material.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Taejoon Park, Hojun Lim, Benjamin Reedlunn, Sharlotte Kramer, Edmundo Corona, Farhang Pourboghrat
Summary: Crystal plasticity finite element models typically assume uniform dislocation distribution within grains, but this study found that considering the initial nonuniformity of dislocations led to more accurate predictions in simulations comparing to experiments.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
M. A. Ritzo, R. A. Lebensohn, L. Capolungo, S. R. Agnew
Summary: This study explores the role of dislocation climb in mediating plasticity in a Mg alloy at moderately elevated temperatures. The results reveal that dislocation climb is important over a wide range of temperatures and strain rates, and provides an explanation for various observations.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Lin Pi, Junjie He, Xinpei Zhang, Yang Chen, Ming Liang, Guangjie Xue, Xiaoyu Yang, Meng Xing, Kai Xiong, Shunmeng Zhang, Yong Mao
Summary: The effect of Li element on the microstructure and texture evolutions of Mg-2Zn alloy sheet during room temperature bending was investigated. The addition of 3 wt.% Li modified the texture of the extruded Mg-2Zn sheet, resulting in improved bendability. The TD-elongated texture distribution provided more efficient deformation modes during bending, releasing the thickness strain more effectively compared to the extruded Mg-2Zn sheet.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Guowei Zhou, Ruxue Liu, Weiqin Tang, Dayong Li, Yinghong Peng, Peidong Wu
Summary: Research on the evolutions of strain-rate sensitivity in two slip modes, basal and prismatic in AZ31B alloy sheet, reveals that at high temperatures, the alloy becomes more sensitive to strain rate under rolling direction tension and the anisotropy also presents a clearly increasing trend with loading rate. Numerical simulation results suggest that the difference in SRSs is responsible for the strain-rate dependence of the r-value at high temperatures, which may present different evolution trends with temperature.
Article
Materials Science, Multidisciplinary
G. Y. Huang, G. S. Zhang, P. Song, X. M. Liu, X. Lv, M. Li, J. H. Zhang, W. K. Deng, D. F. Guo
Summary: Bulk nanostructured metallic materials were fabricated through beta-quenching treatment and rolling deformation of pure Zr, achieving grain refinement on nanoscale and ultrafine scale. The nanostructure formation was attributed to the low initial basal texture and lamella-shaped grains, providing a novel approach to produce bulk nanostructured materials.
Article
Materials Science, Multidisciplinary
C. Ha, J. Bohlen, X. Zhou, H-G Brokmeier, K. U. Kainer, N. Schell, D. Letzig, S. Yi
Summary: This study investigated the differences in texture development and active deformation mechanisms during sheet rolling for binary Mg-RE or Mg-Ca alloys compared to their ternary counterparts with Zn. The analyses were based on in-situ synchrotron experiments and electron backscatter diffraction measurements, revealing direct experimental evidence of texture development and active deformation mechanisms. Higher activations of nonbasal a c+a 1010 a a c+a a slip in the Zn-containing ternary alloys were confirmed through EBSD misorientation analysis.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Huan Zhang, Yangxin Li, Yuxuan Liu, Qingchun Zhu, Xixi Qi, Gaoming Zhu, Jinhui Wang, Peipeng Jin, Xiaoqin Zeng
Summary: This study investigates the features and evolution mechanism of {11 (2) over bar1} twin boundaries in a high strain rate compressed Mg-10Gd-3Y-0.4Zr alloy using Schmid factor calculations, EBSD, and TEM analysis. The interaction between basal < a > dislocations and twins during deformation can lead to misorientation deviation and the formation of steps at the twin boundary, providing a new understanding of twinning behavior in Mg alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Wenqi Liu, Nagore Otegi, Ana Orallo, Manex Barrenetxea, Iosu Aizpuru, Junhe Lian, Joseba Mendiguren
Summary: Aluminium alloys are efficient materials for weight reduction in the car industry, but they often face challenges in plastic deformation processes. This study explores the post-forming electro-plastic effect in AA5754 material and finds that a certain range of electric pulses can reduce stress without significantly impacting the material's mechanical performance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
A. Breidi, S. L. Dudarev
Summary: This study investigates the thermal evolution and elevated temperature annealing of the dislocation microstructure in an irradiated metal using discrete dislocation dynamics simulations. The results suggest that the evolution of dislocations is primarily driven by the pipe diffusion of atoms along the dislocation lines and the diffusion of vacancies in the crystal bulk. The temperature plays a significant role in the coalescence and coarsening of the dislocation loop microstructure.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yinan Cui, Nasr Ghoniem, Giacomo Po
Summary: This study reviewed recent work on plastic deformation in irradiated materials at the nano- and micro scales using Discrete Dislocation Dynamics (DDD) simulations. The simulations provided new insights into collective dislocation-irradiation defect interactions, as well as the temporal and spatial characteristics associated with plastic instabilities. The development of theoretical models and probability models advanced the understanding of plastic flow localization in irradiated materials for the design of future radiation-resistant materials.
JOURNAL OF NUCLEAR MATERIALS
(2021)