Article
Materials Science, Multidisciplinary
Shuang Zhang, Fei Wang, Ping Huang
Summary: The study demonstrates that embedding graphene into nanocrystalline Cu can enhance the mechanical properties of materials, delay softening, and increase the Hall-Petch slope, which is crucial for overcoming strength limitations.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Yu Wen, Bo Guan, Yunchang Xin, Chenglu Liu, Peidong Wu, Guangjie Huang, Qing Liu
Summary: The solute atom mediated Hall-Petch relations were investigated for Mg-Y, Mg-Al, Mg-Gd, and Mg-Zn alloys at a nominal solute content of 0.35 at.%. It was found that Mg-Y and Mg-Gd exhibited significantly lower Hall-Petch slope (k) values (220 MPa·μm(1/2) and 285 MPa·μm(1/2), respectively) compared to Mg-Al and Mg-Zn (324 MPa·μm(1/2) and 322 MPa·μm(1/2), respectively) under compression along the extrusion direction. The addition of Zn or Al led to a strong basal texture and predominantly basal slip deformation, while the addition of Gd or Y resulted in a weakened texture and activation of both {10 (1) over bar2} twinning and basal slip. This difference in deformation mechanisms contributed to the lower k values in Mg-Y and Mg-Gd alloys.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Jing Xu, Bo Guan, Yunchang Xin, Xuedong Wei, Guangjie Huang, Chenglu Liu, Qing Liu
Summary: In this study, a weak texture dependence of Hall-Petch slope (k) in a rare-earth containing Mg-2Zn-1Gd plate was reported, with similar k values for TD-tension and RD-tension. This characteristic can be well predicted by the compound use of activation stress difference and geometric compatibility factor, attributing the mechanism to the activation of a high fraction of additional deformation mode.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Abbas Mohammadi, Nariman A. Enikeev, Maxim Yu Murashkin, Makoto Arita, Kaveh Edalati
Summary: The study achieved nanograin sizes in an Al-La-Ce alloy through ultra-SPD followed by aging, and identified two breaks in the Hall-Petch relationship. Detailed analysis confirmed that nanograin formation alone is not sufficient for extra hardening, and additional strategies such as grain-boundary segregation and precipitation are necessary to address the issue of softening.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Yifan Bu, Xiuzhen Zhang, Dengshan Zhou
Summary: Experimental observations show that the strain dependence of the Hall-Petch slope in Al-Mg alloys is significantly influenced by the formation of Laders bands and the Mg content. The Hall-Petch slope initially drops due to Laders deformation, then increases with plastic strain until reaching its maximum, and subsequently decreases due to dynamic recovery. Alloys with higher Mg contents exhibit a larger Hall-Petch slope at a given strain, and their dynamic recovery is postponed until a larger strain is reached. Interestingly, a model developed for low stacking fault energy materials accurately describes the relationship between the Hall-Petch slope, Mg content, and strain magnitude.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Elango Chandiran, Yukiko Ogawa, Rintaro Ueji, Hidetoshi Somekawa
Summary: The effect of grain size and strain rate on the room-temperature compression of pure magnesium was studied. It was found that the deformation mechanisms and grain-boundary sliding were significantly influenced by grain size and strain rate, and the Hall-Petch relationship broke down under certain conditions. Additionally, the deformation mode had a negligible impact on the dominant deformation mechanisms and the Hall-Petch breakdown.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Bartosz Sulkowski
Summary: The study investigated the deformation modes and twin hardening of pure magnesium under compression, revealing the influence of different textures on the deformation behavior. The combination of fine-grained structure and hard type texture components introduces twinning as the main deformation mode and enhances the mechanical properties of magnesium and its alloys.
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Metallurgy & Metallurgical Engineering
Lei Liu, Xiaojie Zhou, Shilun Yu, Jian Zhang, Xianzheng Lu, Xin Shu, Zaijun Su
Summary: The effects of different treatments on the microstructure and mechanical properties of an extruded Mg-4.3Gd-3.2Y-1.2Zn-0.5Zr alloy were investigated. The study found that grain growth, texture changes, and stability of LPSO phases have an impact on the alloy's properties.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Ruixiao Zheng, Wu Gong, Jun-ping Du, Si Gao, Maowen Liu, Guodong Li, Takuro Kawasaki, Stefanus Harjo, Chaoli Ma, Shigenobu Ogata, Nobuhiro Tsuji
Summary: This study reveals that the softening effect caused by grain boundary sliding can be reversed and the Hall-Petch strengthening can be regained through grain refinement in ultrafine grained pure Mg at cryogenic temperature. The UFG Mg exhibits ultrahigh tensile strength but significantly reduced ductility at 77K.
Article
Materials Science, Multidisciplinary
Quanfeng Han, Xin Yi
Summary: As the average grain size decreases, the reduction in intragranular dislocation storage ability is revealed as the underlying mechanism of the breakdown of Hall-Petch behavior in nanocrystalline (NC) metals. The prediction of the critical grain size for the HP-inverse HP transition of NC metals agrees well with experimental results, showing remarkable ductility enhancement in the inverse HP region dominated by harmonized deformation of grain boundaries and grain interior. Additionally, the increase in grain boundary strength leads to enhancement in yield strength and delay in occurrence of the inverse HP behavior in NC metals.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Nanoscience & Nanotechnology
Kai Yao, Xiaohua Min
Summary: This study investigated the effect of grain size on the tensile properties of Ti-15Mo alloy, revealing that the impact decreased with increasing strain and eventually became negative. A dynamic Hall-Petch relation was established based on effective grain size, showcasing twin activation, twin suppression, and various interactions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Nan Wang, Yongnan Chen, Gang Wu, Zhen Zhang, Zhicheng Wu, Jinheng Luo
Summary: The evolution of low angle grain boundaries and Taylor factor in dual-phase steel during prestraining was investigated, showing a transition from plastic deformation dominated by soft ferrite phases to interface deformation. The hardening of ferrite was attributed to the formation of stable dislocation subgrain structures, leading to reduced strain hardening ability, increased yield strength, and decreased uniform elongation. The stress drop observed after strain hardening completion initiated plastic deformation directly at the interface, resulting in a mixed mode of failure involving both cleavage brittle and dimple ductile fracture. This study provides insights and experimental evidence for ferrite hardening behavior after prestraining in dual-phase steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Seok-Jun Park, Kyung-Shik Kim, Jee-Hyun Kang, Sung-Joon Kim
Summary: In this study, the Hall-Petch relationship was investigated for austenitic stainless steels with either 0.3 wt% C or N. It was found that the nitrogen-containing steel exhibited a higher Hall-Petch slope, indicating that a higher stress was required to activate the dislocation source in adjacent grains. The researchers suggested that the presence of nitrogen in the steel hindered cross-slip at the grain boundaries and delayed the activation of the dislocation source.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
K. A. Darling, B. C. Hornbuckle, C. J. Marvel, V. H. Hammond, K. Solanki
Summary: The paper provides a critical assessment of the role of grain size in limiting strength gains in stable nanocrystalline metals. Using copper-tantalum binary alloys, the study explores the breakdown of classical Hall-Petch behavior and its underlying mechanisms. The results show that Cu-Ta alloys exceed traditional strength limits predicted by the Hall-Petch relationship for NC Cu.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Rui Ren, Jianfeng Fan, Binshan Wang, Qiang Zhang, Weiguo Li, Hongbiao Dong
Summary: Grain refinement is an effective way to improve the mechanical properties of Mg according to the Hall-Petch theory. This study investigated the grain size dependence on the deformation microstructure, dislocation density, strain rate sensitivity, activation volume, and mechanical properties of pure Mg samples with different grain sizes. Different Hall-Petch relationships were found for pure Mg samples with varying grain sizes, providing insights for improving the mechanical properties of Mg.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Zuzanka Trojanova, Peter Palcek, Maria Chalupova, Pavel Lukac, Ivana Hlavacova
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH
(2016)
Article
Engineering, Mechanical
Jaroslav Balik, Patrik Dobron, Frantisek Chmelik, Radomir Kuzel, Dania Drozdenko, Jan Bohlen, Dietmar Letzig, Pavel Lukac
INTERNATIONAL JOURNAL OF PLASTICITY
(2016)
Article
Nanoscience & Nanotechnology
Daria Drozdenko, Jan Bohlen, Frantisek Chmelik, Pavel Lukac, Patrik Dobron
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2016)
Article
Nanoscience & Nanotechnology
Saeideh Abaspour, Victor Zambelli, Matthew Dargusch, Carlos H. Caceres
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2016)
Article
Materials Science, Multidisciplinary
Devarajan Nagarajan, Carlos H. Caceres, John R. Griffiths
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2016)
Article
Materials Science, Multidisciplinary
Saeideh Abaspour, Carlos H. Caceres
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2016)
Article
Anesthesiology
Laura A. Frey-Law, Nicole L. Bohr, Kathleen A. Sluka, Keela Herr, Charles R. Clark, Nicolas O. Noiseux, John J. Callaghan, M. Bridget Zimmerman, Barbara A. Rakel
Article
Thermodynamics
Zuzanka Trojanova, Zdenek Drozd, Peter Minarik, Pavel Lukac, Alla Kasakewitsch
THERMOCHIMICA ACTA
(2016)
Article
Nanoscience & Nanotechnology
D. Nagarajan, X. Ren, C. H. Caceres
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2017)
Article
Materials Science, Multidisciplinary
D. Nagarajan, C. H. Caceres
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2018)
Article
Crystallography
Zuzanka Trojanova, Kristyna Halmesova, Jan Dzugan, Zdenek Drozd, Peter Minarik, Pavel Lukac
Proceedings Paper
Metallurgy & Metallurgical Engineering
Zuzanka Trojanova, Pavel Lukac, Peter Minarik, Gergely Nemeth, Manoj Gupta, Sankar Seetharaman, Giorgio Di Fabio
METAL 2016: 25TH ANNIVERSARY INTERNATIONAL CONFERENCE ON METALLURGY AND MATERIALS
(2016)
Article
Materials Science, Multidisciplinary
Nizar Lefi, Salem Neily, Roland Bonnet
Summary: This paper investigates the elastic field in a bi-material crystal with an angular dislocation line with one branch placed in the crystal and the other along a strongly bound or welded interface. The analysis formulates the elastic field of a closed dislocation loop and solves it using the knowledge of the Green's tensor of the bi-material. The study provides a faster calculation method and has important implications for solving interfacial angular dislocation problems.
PHILOSOPHICAL MAGAZINE
(2024)