Article
Materials Science, Multidisciplinary
Zhiquan Huang, Chuanlu Qi, Yanchun Zhu, Guowei Yang, Hongyu Lai, Jinchao Zou
Summary: The microtexture evolution of AZ31 magnesium alloy plate edge samples was studied using EBSD, revealing that the generation of extension twins is influenced by varying deformation conditions. At room temperature, the edge samples exhibited significantly greater texture strength than the middle part, with the consumption of hard-oriented grains and weakening effect of the basal texture being proportional to the volume fraction of extension twins.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Yu Zhang, Xiao Li, Renlong Xin, Shewei Xin, Qing Liu
Summary: This study aimed to understand the cross-boundary behavior of {332}(113) twinning in a metastable Ti-15Mo alloy and found that non-Schmid twins might be promoted by the cross-boundary behavior. It was also discovered that CSF is more effective than SF for twin variant prediction in Ti-15Mo alloy. Furthermore, the influence of boundary angle on twinning transfer behavior was revealed based on CSF analysis.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Pengfei Yang, Zhiyuan Yang, Lin Li, Qi Sun, Li Tan, Xinkai Ma, Minhao Zhu
Summary: When the external tension loading is parallel to the normal direction of the magnesium alloy plate, multiple {10(1) over bar2} twin variants can be activated. In addition to abundant primary {10(1) over bar2} twins, an atypical double twinning sequence can occur during uniaxial loading, with secondary twins forming at regions where two primary twins of different variant pairs interact. The formation of these secondary twins may be closely related to the minimization of local strain incompatibility at the twinning boundary caused by basal dislocations within the primary twins.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yingjun Sun, Kecheng Zhou, Hua Qiao, Renlong Xin, Huamiao Wang, Peidong Wu
Summary: For polycrystalline materials with the deformation mechanism of twinning, the interaction between the twins and grain boundaries play a significant role in their deformation behavior. In this study, the twin transmission across grain boundaries in a magnesium bicrystal was investigated using a crystal plasticity finite element model, with factors like crystallographic orientation, GB misorientation, CRSS, dislocation slip, and twin-induced stress relaxation considered. The CSF was found to interpret twin transmission better and accurately capture the fraction of twin-transmitted grain boundaries.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Lichao Li, Chunjoong Kim, Young-Min Kim
Summary: Four types of slip systems and two types of twinning were identified in magnesium alloys using SEM and EBSD. The Schmid factors of these slip systems were calculated based on the Euler angle obtained from EBSD. The identification of slip systems and calculation of Schmid factors are crucial for understanding the deformation mechanism of the material.
Article
Materials Science, Multidisciplinary
Takahiro Mineta, Ryusuke Suzumura, Akihiro Konya, Hiroyuki Sato
Summary: The creep resistance of extruded AZ31 alloys was improved through the application of a PCA (pre-compression and annealing) process, which resulted in significant grain coarsening and weakened basal texture. The minimum creep rate decreased and the creep life increased with increasing pre-compressive strain in the PCA samples. It is believed that the significant grain coarsening and alteration of crystallographic orientation brought about by the PCA process contribute to the improved creep resistance of the extruded AZ31 alloys.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Feng Zhang, Mingcheng Sun, Baojie Sun, Fengzheng Zhang, Yikui Bai, Zheng Liu
Summary: The study reveals the competitive relationship of different deformation mechanisms in wrought AZ31 magnesium alloy during dynamic compressive experiments at temperatures between 20 and 350 °C. The results show that the c-axis of grains gradually reorient parallel to the normal direction with increasing temperature, unless DRX mechanism is activated or grains grow up. Non-basal slip and 101 over bar 2 tension twinning are the predominant deformation mechanisms at different temperature ranges. The predominant type of DRX mechanism is rotational dynamic recrystallization, which hinders the enhancement of kernel misorientation concentration region.
Article
Materials Science, Multidisciplinary
Cyril Cayron
Summary: This study proposes that the parent-twin interface can be a distorted rational plane, contrary to the assumption of a fully invariant plane. By relaxing the invariant plane assumption, the observed asymmetric facets and unconventional twins in magnesium can be explained. A computer program is developed to calculate different types of twins and explain peculiar phenomena in magnesium.
Article
Materials Science, Multidisciplinary
Bin Zhang, Yunxia Sun, Tuo Liang, Yunzhen Li, Tian Li, Jingchao Wang, Ruiru Cai, Juhao Wu, Jie Zheng, Changlin Yang
Summary: The serrated flow, or Portevin-Le Châteleier (PLC) effect, was observed in AlN/AZ91 composites during uniaxial compression testing at 350 degrees C and a strain rate of 0.05 s(-1). The PLC effect was found to originate from the repeated shearing of extension twins by pyramidal dislocations in favorably orientated grains, while the presence of AlN particles induced profuse activation of extension twins and pyramidal dislocations, providing new insights into the PLC effect in magnesium-based materials.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Wenhan Jin, Baolin Wu, Li Zhang, Gang Wan, Lu Zhang, Yan Tang, Guosheng Duan
Summary: Based on the calculation of generalized Schmid factor (G-SF), this study investigated the twinning character and texture development in the rolling plate of randomly-oriented AZ31B magnesium alloy. The findings indicate that the selection of twinning type is not only related to crystal orientation and G-SF, but mainly determined by the significant difference in critical resolved shear stress (CRSS) between extension twinning and contraction twinning. Additionally, the orientation of the matrix grains plays a crucial role in the activation of twinning and the formation of basal texture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Mathematics, Applied
Denis Serre
Summary: This study examines the motion of a finite yet large number of hard spheres in space considering elastic collisions. By applying the theory of Compensated Integrability, the researchers found that only O(N-2) collisions have significant impact on the particles' deviations.
ARCHIVE FOR RATIONAL MECHANICS AND ANALYSIS
(2021)
Article
Biochemistry & Molecular Biology
Guofeng Wu, Fenbo Ma, Zhengwei Liu, Jiayi Liu, Yizhebang Xue, Mengdi Zhang, Chunyi Wen, Bin Tang, Lijun Lin
Summary: The alteration of extracellular matrix (ECM) homeostasis is crucial in the development of osteoarthritis (OA). This study developed magnesium-containing glycosaminoglycans (Mg-GAGs) to improve ECM conditions, promote cartilage regeneration, and alleviate OA. The results showed positive effects of Mg-GAGs on chondrocyte proliferation, upregulating chondrogenic genes, suppressing inflammation, and protecting subchondral bone in an OA rabbit model. This study provides new insights into ECM-based therapies and novel approaches for OA treatment.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Materials Science, Multidisciplinary
Jilong Geng, Zhifeng Yan, Hongxia Zhang, Yongquan Liu, Peng Dong, Shuo Yuan, Wenxian Wang
Summary: Ultrasonic surface rolling process (USRP) can generate gradient nanostructured surface and high compressive residual stresses on magnesium alloy, improving strength through twins and texture evolution.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Physics, Multidisciplinary
Sergio Contreras, Alejandro Gil-Villegas
Summary: Computer simulations and theoretical results of N Quantum Hard Spheres (QHS) particles show that analytical results can be provided for extreme and maximum confinement based on an extension of the Helmholtz free energies for classical systems.
Article
Materials Science, Multidisciplinary
Wenhong Yin, Weiguo Wang
Summary: By using TEM, the dislocation structure at triple junctions with small to medium deformation in high pure copper samples was observed and analyzed. It was found that the dislocation density increases with deformation, with dislocation lines introduced in slightly cold rolled copper and dislocation networks formed as deformation increases. Additionally, the study determined the dislocations to be (1/2) (011) perfect dislocations, with higher dislocation density in soft grains compared to hard grains at the same deformation level.
MATERIALS CHARACTERIZATION
(2021)