Article
Geochemistry & Geophysics
Filippe Ferreira, Lars N. Hansen, Katharina Marquardt
Summary: The study focuses on the plastic deformation and the role of grain boundaries in olivine deformation. Specific types of grain boundaries created by dislocation activity facilitate grain-boundary sliding. With progressive deformation, there is an increase in abundance of apparently slip-transparent boundaries.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Materials Science, Multidisciplinary
Shengli Guo, Xiaoyu Zhang, Jun Zhong, Shuaishuai Wu, Wei Jiang
Summary: In this study, the deviation distributions of Sigma 3 and Sigma 9 grain boundaries in a Hastelloy C-276 sheet were measured using EBSD technology. The results showed that the hot rolling process caused significant deviation of Sigma 3 grain boundary orientations and loss of special properties. On the other hand, the Sigma 9 grain boundary plane distribution became more diffused with increasing deformation. Additionally, distorted grain boundaries acted as nucleation sites for dynamic recrystallization during hot rolling.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Xianfeng Liao, Linhan Li, Kalubi Ren, Yanlin Jia, Yong Pang, Zhu Xiao, Yanbin Jiang, Zhou Li
Summary: The effects of grain size, grain boundary type, and misorientation on the initiation of discontinuous precipitates in a Cue5Ni e1.25Si alloy are investigated in this study. It is found that smaller grain sizes result in a higher percentage of discontinuous precipitates. Only random grain boundaries are capable of initiating discontinuous precipitates, while coincident site lattice boundaries are not. There is also a difference in the initiation of discontinuous precipitates depending on the misorientation axis.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Y. T. Zhou, Y. N. Zan, Q. Z. Wang, B. L. Xiao, Z. Y. Ma, X. L. Ma
Summary: In this study, intergranular corrosion (IGC) in B4C-reinforced 6061Al composite was investigated, showing that IGC only occurred in Cu-containing samples. Artificial aging was found to decrease the resistance to IGC in the composite. Transmission electron microscopy (TEM) characterization revealed a continuous Cu-rich layer along the grain boundaries responsible for the IGC susceptibility of aged Cu-containing samples.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Multidisciplinary
Hsiang-Hou Tseng, Hung-Che Liu, Min-Hsun Yu, Jia-Juen Ong, Dinh-Phuc Tran, Chih Chen
Summary: Copper joints have replaced solder interconnects in integrated circuits due to their great electrical properties and lower-temperature processing. To isolate Cu from oxidizing during bonding processes, a (111)-oriented nanotwinned Ag (NT-Ag) thin layer was electroless-deposited on a (111)-oriented NT-Cu film. The microstructures of the Ag films were then analyzed, showing that columnar NT-Ag grains epitaxially grew along the columnar NT-Cu grains. Additionally, the bonding strength of the Cu-Ag joints was found to be higher than that of the Ag-Ag joints, possibly due to the greater diffusion rate of Ag atoms in Cu than the self-diffusion of Ag.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Qian Wang, Jean-Sebastien Lecomte, Christophe Schuman, Auriane Mandrelli
Summary: During hydrogen charging, the mechanical properties of titanium surface were investigated with nanoindentation tests. The evolution of microstructure is influenced by grain size, with finer grains leading to faster hydride transformation. Adjacent hydrides are more likely to be induced at grain boundaries with specific c-axis misorientation angles.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Keyi Lin, Chenxi Pang, Gang Li, Jujun Ruan
Summary: This study developed a green, efficient, and economical technology using microsolid media frictional separation to enrich scattered metals from flexible Cu(InGa)Se-2 solar cells, effectively reducing the difficulty of waste solar cell treatment.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Pei-Tzu Lee, Chih-Hao Chang, Cheng-Yu Lee, Ying-Syuan Wu, Cheng-Hsien Yang, Cheng-En Ho
Summary: This study systematically investigated the fabrication of Cu pillars through high-speed electrodeposition and their adhesion to an Ajinomoto build-up film. The characteristics of the Cu pillars electroplated with various current densities were analyzed, and the adhesion to the ABF substrate after high-temperature storage was evaluated. The study provides valuable insights into electrochemical metal deposition and the development of high-speed Cu electrodeposition technology.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Jongpil Ye, Jaehoon Jeong
Summary: The grain structure of graphene significantly influences its properties, making it crucial to control for application. Inconsistent results regarding the correlation between the grain structures of graphene and underlying Cu have been found in previous investigations. Research suggests that the origin of this discrepancy lies in the effects of copper grain boundary structure on graphene growth.
Article
Materials Science, Multidisciplinary
Zhiping Wang, Hongyu Xiao, Wei Chen, Yugang Li, Jiwei Geng, Keneng Li, Peikang Xia, Mingliang Wang, Xianfeng Li, Dong Chen, Haowei Wang
Summary: The dependence of grain boundary structure on precipitation at grain boundaries (GBs) in a TiB2/Al-Zn-Mg-Cu composite has been systematically investigated. It was found that the average size and coverage of grain boundary precipitates (GBPs) increase while the number density decreases with the increasing misorientation of low angle GBs (LAGBs). For high angle GBs (HAGBs), the coincidence site lattice (CSL) GBs and TiB2 particles have an effect on GBPs. The results indicate that TiB2 particles promote the nucleation of GBPs while limiting their growth.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Yang Su, Thanh Phan, Liming Xiong, Josh Kacher
Summary: This paper combines in situ high-resolution electron backscattered diffraction (EBSD) with concurrent atomistic-continuum (CAC) simulations to investigate the interactions between dislocation-mediated slip and grain boundaries (GBs) in Ni. The study shows that the local stress at slip-GB intersections initially increases with the pileup of dislocations and remains high, even after the nucleation of dislocations in the neighboring grain. The local stress only relaxes when the nucleated dislocations propagate away from the GB due to more incoming dislocations participating in the pileup. The relaxation of local stress is accompanied by the reconfiguration of atomic-scale GB structure, which not only affects subsequent dislocation transmission but also the configuration of dislocations away from the GB. These findings highlight the importance of incorporating local stress history in higher length scale models, such as crystal plasticity finite element.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Kefu Zhu, Shiqiang Wei, Quan Zhou, Shuangming Chen, Yunxiang Lin, Pengjun Zhang, Yuyang Cao, Changda Wang, Yixiu Wang, Yujian Xia, Dengfeng Cao, Zeinab Mohamed, Xin Guo, Xiya Yang, Xiaojun Wu, Li Song
Summary: Transition metal selenides have received great attention due to their high theoretical capacity, but the fluctuation in volume during charge/discharge process leads to significant reduction in electrochemical performance. In this study, carbon-regulated copper(I) selenide (Cu2Se@C) is designed to enhance the stability and ion diffusion in selenide electrodes, resulting in improved storage kinetics. The experimental results show that the capacitance process plays a crucial role in the Cu2Se@C material.
Article
Materials Science, Multidisciplinary
Qiyang Tan, Yu Yin, Ming-Xing Zhang
Summary: The present study compares the grain-refining efficiencies of Ti nanoparticles and LaB6 nanoparticles as inoculators in a 2024 Al alloy during additive manufacturing (AM). The experimental results reveal that Ti nanoparticles have a more pronounced refinement effect and lead to a fine, fully equiaxed microstructure, while LaB6 nanoparticles have almost no refining effect on the alloy. Further analysis suggests that the higher refining efficiency of Ti inoculation is attributed to the incorporation of Ti solute and the in situ-formed L1(2)-Al3Ti nucleation particles. This work highlights the importance of incorporating appropriate solutes to generate sufficient undercooling for the activation of heterogenous nucleation in AM.
Article
Materials Science, Multidisciplinary
Senzhen Wang, Shun Xu, Chongchen Xiang, Zijian Wang, Hanlin Ding
Summary: This study investigates the mechanisms of <111> dislocation transmission at low angle grain boundaries and high angle grain boundaries in Ti-5553 alloy. It is found that low angle grain boundaries have higher geometric alignment and lower residual Burgers vector magnitude, making them more conducive for dislocation transfer.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Xiaojiang Long, Weihao Wang, Wanli Zhang, Guangzhao Wang, Wenxi Zhao
Summary: In this study, shock-induced sliding behavior of (0 0 1) twist grain boundaries in Cu bicrystal was investigated using molecular dynamics simulations. The sliding of grain boundaries is found to be produced by transverse particle motion in the constituent grains and is resisted by the viscosity of the grain boundaries. The magnitude of sliding is determined by the angle between the [1 0 0] direction in the grain and the shock direction.
RESULTS IN PHYSICS
(2022)
