Article
Engineering, Mechanical
Sergey Galitskiy, Avanish Mishra, Avinash M. Dongare
Summary: Understanding the role of microstructural heterogeneities on shock wave propagation and defect evolution behavior is essential in predicting the dynamic response of metals. The newly developed quasi-coarse-grained dynamics (QCGD) method extends molecular dynamics (MD) simulations to model the void collapse behavior and investigate the postcollapse microstructure evolution. The simulations reveal the variations in plasticity contributions and rates of void collapse under different shock pressures and void sizes.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
S. Verheyden, L. Deillon, A. Mortensen
Summary: A microcasting process is used to produce high aspect ratio monocrystalline pure aluminium wires. The role of thermal activation in the plastic deformation of these microwires is investigated. The results show that the microwires deform largely in an intermittent fashion and the bursts can be triggered through thermal activation. The presence of a back-stress on the order of 2.5 MPa is attributed to the thin layer of oxide covering the metal. Smaller diameter crystals show different characteristics compared to bulk aluminium. These findings are important for understanding the deformation behavior of microcrystalline aluminium.
Article
Engineering, Mechanical
Zhanfeng Wang, Junjie Zhang, Jinzhong Lu
Summary: Crystallographic orientations and grain boundaries have significant effects on the friction and wear performance of polycrystalline materials. This study used experiments and simulations to show the underlying effect of crystallographic orientations and grain boundaries on the nanoscratching behavior of bi-crystal Cu.
Article
Metallurgy & Metallurgical Engineering
Feng Wen, Ji-qiang Chen, Shuang Han, Zi-xiang Zhou, Shi-biao Zhong, Ying-hui Zhang, Wei-rong Li, Ren-guo Guan
Summary: The effect of crystal orientations and precipitates on the corrosion behavior of Al-Cu-Li single crystals has been studied. It was found that both crystal orientations and precipitates affect the corrosion rate and corrosion resistance of the alloy.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Engineering, Mechanical
He Wang, Hechang Li, Yue Zhao, Xuetong Liu, Jinfang Peng, Jianhua Liu, Minhao Zhu
Summary: This study quantitatively describes the fatigue failure process of aluminium alloy riveted single-shear lap joints by analyzing the dynamic response. Firstly, a numerical analysis method based on MATLAB is proposed to calculate the cyclic relative displacement amplitude, stiffness, and dissipated energy. Secondly, the service behavior corresponding to the evolution of relative displacement amplitude and dissipated energy is analyzed and verified through finite element simulation. Finally, the cycles corresponding to crack initiation, slow and rapid propagation are calculated and verified by observing crack growth propagation through interruption tests based on the evolution of cyclic compression stiffness.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Optics
Qiuling Wen, Xinyu Wei, Xipeng Xu, Jing Lu, Changcai Cui
Summary: This study used an ultraviolet nanosecond laser to create microgrooves on single-crystal CVD diamond surfaces and found that the surface morphology, ablation rate, and material removal rate of the microgrooves were strongly dependent on crystal orientation. Microgrooves along the (110) crystal orientation had better inner surface morphology and higher material removal rate compared to microgrooves along the (100) crystal orientation. Raman and transmission electron microscopy analysis revealed the presence of graphite particles and the formation of disordered graphite and nanocrystalline diamond during the ablation process.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Feng Wen, Jiqiang Chen, Shibiao Zhong, Zixiang Zhou, Shuang Han, Haigen Wei, Yinghui Zhang, Weirong Li, Renguo Guan
Summary: The study found that the corrosion rates of Al-Cu alloy are mainly influenced by the atomic density of crystal planes and the corrosion product film. The precipitation of precipitates can lead to anodic dissolution of the nearby matrix, accelerating the corrosion rates of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
W. J. Chen, S. X. Han, J. C. Guo, R. N. Yang, X. W. Lei, W. J. Yao, N. Wang
Summary: One-and multi-layer laser powder deposition experiments were conducted on single crystal (SX) Ni-based superalloy DD6 to investigate the effect of substrate orientation on microstructure and SX nature. Different substrate rotations produced various dendritic domain distributions and stray grain susceptibilities. The orientation-dependent susceptibility of stray grains was attributed to the different sensitivities of columnar-to-equiaxed transition (CET) caused by substrate orientations. The results provide insights into controlling stray grains in laser processed SX superalloys.
Letter
Chemistry, Physical
Jiawei Wang, Huaming Wang, Hongwei Gao, Junwei Yang, Meiling Zhang, Xu Cheng, Shuquan Zhang, Dong Liu
Summary: Controlling grain structure and avoiding stray grain (SG) formation is crucial in manufacturing nickel-based single crystal (SX) superalloy components using laser additive manufacturing. This study presents a new approach to inhibit SG formation by optimizing the substrate crystallographic orientation. A numerical model is also developed to predict SG formation in the molten pool by considering the combined effects of substrate orientation and equiaxed grain formation tendency. Both experimental and simulation results indicate that (001)/[110] and (01 root 3)/[100] substrate orientations can effectively suppress SG formation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Qian Yin, Zhixun Wen, Jundong Wang, Yeda Lian, Guangxian Lu, Chengjiang Zhang, Zhufeng Yue
Summary: This study focuses on the stress and strain responses of a second-generation nickel-based superalloy at different temperatures and orientations. Microstructure and dislocation arrangements were observed to analyze the fracture failure modes and dislocation morphologies. A new hardening model and damage evolution law were proposed and successfully fitted the stress-strain response for different conditions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Crystallography
Shizhan Huang, Jiaming Lin, Ningchang Wang, Bicheng Guo, Feng Jiang, Qiuling Wen, Xizhao Lu
Summary: The study investigated the anisotropy of fracture toughness and fracture mechanism of single-crystal sapphire, showing that different crystal planes exhibit varying fracture toughness and behavior, related to the loading surfaces. C-plane sapphire demonstrated the highest fracture toughness and fracture behavior consistent with theoretical analysis.
Article
Nanoscience & Nanotechnology
Xiaoyi Ren, Junxia Lu, Jianli Zhou, Xianqiang Liu, Wenxiang Jiang, Jin Wang, Yuefei Zhang, Ze Zhang
Summary: This study investigated the relationship between fatigue behavior and microstructural evolution of a second-generation nickel-based single-crystal superalloy. The results showed that deformation and fatigue crack propagation varied with different crystal orientations, and fatigue life was influenced by the elastic modulus.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Wei Hu, Jiqiang Chen, Jinjun Xu, Jieke Ren, Jiale Miao, Ting Xing, Renguo Guan, Olanrewaju A. Ojo
Summary: This study investigates the precipitation behavior of an Al-Cu-Li single crystal during creep aging under different loading orientations using high angle annular dark field-scanning transmission electron microscope (HAADF-STEM) observation. The results show that the number density of T1-phase precipitates in the creep-aged alloy is directly affected by the loading directions, with the highest density observed when the loading direction is <001>(infinity) and the lowest density when it is <111>(infinity). In addition, oriented precipitation of T1-phase is found in the sample loaded close to <111>(infinity) direction, whereas theta'-phase is observed in the sample loaded close to <011>(infinity) direction. The hardness evolution of the creep-aged samples aligns with the precipitation behavior. This work proposes a novel method to regulate the precipitation behavior of the creep-aged Al-Cu-Li alloy by controlling the loading direction, with <001>(infinity) being the ideal loading direction for better mechanical properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Anuj Sharma, Devendra K. Dubey
Summary: The response of materials to shock waves is influenced by both their atomic and physical structures. This study analyzes the shock propagation behavior of single crystal aluminum specimens with different levels of porosity at the nanoscale through three-dimensional molecular dynamics simulations. It is found that porosity causes a delay in the travel time of shock waves, with the maximum porosity causing a fourfold increase in travel time compared to solid aluminum. The study also reveals that the shock wave induces sequential phenomena in the aluminum specimens, leading to material spalling, and that the pore walls act as reflecting walls, causing secondary rarefactions and spalling.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Civil
Zhe Xiong, Shaojun Zhu, Xiaozhou Zou, Shuyan Guo, Yu Qiu, Lijuan Li
Summary: The study shows that joint semi-rigidity can significantly reduce the buckling capacity of cylindrical reticulated shells, and the support condition also affects the buckling behavior. The elasto-plastic behavior is less sensitive to the rise-to-span ratios but more sensitive to other parameters. The derived formulae for estimating the elasto-plastic buckling capacity of cylindrical reticulated shells based on numerical analysis results are effective in practical engineering applications.
ENGINEERING STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
R. E. Winter, M. Cotton, E. J. Harris, J. R. Maw, D. J. Chapman, D. E. Eakins, G. McShane
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2014)
Article
Multidisciplinary Sciences
J. C. Wood, D. J. Chapman, K. Poder, N. C. Lopes, M. E. Rutherford, T. G. Whites, F. Albert, K. T. Behm, N. Booth, J. S. J. Bryant, P. S. Foster, S. Glanzer, E. Hill, K. Krushelnick, Z. Najmudin, B. B. Pollock, S. Rose, W. Schumaker, R. H. H. Scott, M. Sherlock, A. G. R. Thomas, Z. Zhao, D. E. Eakins, S. P. D. Mangles
SCIENTIFIC REPORTS
(2018)
Article
Astronomy & Astrophysics
Lukasz Farbaniec, David J. Chapman, Jack R. W. Patten, Liam C. Smith, James D. Hogan, Alexander Rack, Daniel E. Eakins
Summary: The study investigated the relationship between the dynamic mechanical properties of stony meteorites and their microstructures using advanced imaging techniques and microCT analysis. It validated and explained the fragmentation process in meteorites, providing insights into impact-induced fragmentation processes that have shaped the solar system.
Article
Materials Science, Multidisciplinary
J. C. F. Millett, D. L. Higgins, D. J. Chapman, G. Whiteman, I. P. Jones, Y. -L. Chiu
JOURNAL OF DYNAMIC BEHAVIOR OF MATERIALS
(2018)
Proceedings Paper
Physics, Applied
G. R. Tear, D. E. Eakins, D. J. Chapman, W. G. Proud
18TH APS-SCCM AND 24TH AIRAPT, PTS 1-19
(2014)
Proceedings Paper
Physics, Applied
D. R. Jones, D. J. Chapman, D. E. Eakins
18TH APS-SCCM AND 24TH AIRAPT, PTS 1-19
(2014)
Proceedings Paper
Physics, Applied
L. E. Chen, D. E. Eakins, D. C. Chapman, N. Thadhani, D. C. Swift, M. Kumar
18TH APS-SCCM AND 24TH AIRAPT, PTS 1-19
(2014)