Article
Materials Science, Multidisciplinary
Fenghui Duan, Qian Li, Zheling Shen, Zhihao Jiang, Wenbin Liu, Yang Yan, Jie Pan, Ligang Sun, Jian Lu
Summary: In this study, nanotwinned structures with extremely fine twin boundary spacing were synthesized, and their mechanical responses were systematically investigated under different loading directions. Continuous strengthening was observed in columnar-grained nanotwinned Ni and Ni alloys, contrary to the softening effect observed in nanotwinned metals with equiaxed grains. The mechanism for continuous strengthening was found to transform from twin boundary obstructing dislocations to dislocation starvation-dominated mechanism as the twin boundary spacing decreased to a critical value.
Article
Chemistry, Physical
Yuman Zhu, Kun Zhang, Zhichao Meng, Kai Zhang, Peter Hodgson, Nick Birbilis, Matthew Weyland, Hamish L. Fraser, Samuel Chao Voon Lim, Huizhi Peng, Rui Yang, Hao Wang, Aijun Huang
Summary: Laser additive manufacturing can be used to create unique internally twinned nanoprecipitates in commercial titanium alloys, leading to the fabrication of ultrastrong metallic materials with complex shapes for various applications. By exploiting thermal cycling and rapid solidification, additive manufacturing can produce titanium alloys that are both ultrastrong and thermally stable, making them suitable for direct implementation. After simple post-heat treatment, a commercial titanium alloy demonstrated adequate elongation and tensile strengths over 1,600 MPa. These excellent properties are attributed to the formation of dense, stable, and internally twinned nanoprecipitates, which are rarely observed in traditionally processed titanium alloys. This work opens up possibilities for fabricating structural materials with unique microstructures and excellent properties.
Article
Nanoscience & Nanotechnology
J. X. Li, Y-N Shi, Z. S. You, X. Y. Li
Summary: This study investigates the plastic deformation in an electrodeposited nanotwinned columnar grained Ni-Mo film with extremely fine grain size. The significant detwinning and texture evolution observed during tensile straining can be attributed to interface energy minimization. The activity of threading dislocations contributes to high yield strength and noticeable deformability in the material.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Linfeng Bu, Zhao Cheng, Yin Zhang, HengAn Wu, Ting Zhu, Lei Lu
Summary: The strength-controlling dislocation mechanism in nanotwinned metals is illuminated by partitioning the flow stress into effective stress and back stress components. Recent experiments show a nearly constant saturated effective stress of about 100 MPa in nanotwinned Cu with nanotwin thicknesses less than 100 nm. This surprising result suggests that trans-twin dislocations spanning multiple nanotwin lamellae, rather than threading dislocations within individual lamellae, control the effective stress.
SCRIPTA MATERIALIA
(2023)
Review
Chemistry, Multidisciplinary
Qiang Li, Sichuang Xue, Cuncai Fan, Nicholas A. Richter, Yifan Zhang, Youxing Chen, Haiyan Wang, Xinghang Zhang
Summary: Extensive research has been conducted on nanotwinned metals, with a focus on tailoring microstructures and properties through extrinsic and intrinsic factors. Epitaxial growth of NT metals and alloys on single crystal substrates is reviewed to advance our comprehension towards achieving desirable properties.
Article
Materials Science, Multidisciplinary
Kai Hu, Jun Yi, Bo Huang, Xilei Bian, Gang Wang
Summary: This study overcomes the trade-off between strength and ductility in pure nickel materials by using grain boundary relaxation and optimizing grain size. The results show that grain boundary relaxation can improve both tensile strength and uniform elongation of nickel, and enhance the plastic deformation through controlling dislocation activities.
APPLIED MATERIALS TODAY
(2022)
Article
Materials Science, Multidisciplinary
Guangya Li, Yang Yang, Boyuan Gou, Jinyu Zhang, Jiao Li, Yaqiang Wang, Lingfei Cao, Gang Liu, Xiangdong Ding, Jun Sun
Summary: By controlling the defects of coherent twin boundaries (CTBs) through Cr segregation at kinks and grain boundaries (GBs), high strength and excellent structural-mechanical stability can be achieved, providing a new perspective for the design of purified Cu alloys.
Article
Chemistry, Multidisciplinary
Wufan Chen, Panpan Wan, Qingkun Zhao, Haofei Zhou
Summary: The study found that Gradient nanotwinned (GNT) metals demonstrate extra strengthening and work hardening behaviors with impressive potentials in engineering applications. A constitutive model elucidating the extra strengthening effect is currently lacking, therefore, a theoretical framework was proposed to describe the mechanical response of GNT metals, aiding in guiding the structural design of gradient metallic materials.
Article
Materials Science, Multidisciplinary
Danilo de Camargo Branco, Luize Scalco de Vasconcelos, Licong An, Kejie Zhao, Gary J. Cheng
Summary: This study presents a systematic approach to induce gradient heterostructures on pure aluminum parts fabricated by SLM using pulsed lasers, resulting in ultrafine grain structures with enhanced mechanical properties. The multiscale computational framework developed in this work enables the simulation of laser processing, microstructure evolution, and mechanical strength prediction, providing valuable insights for enhancing material properties in additive manufacturing.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Yen Fred Woguem, Pierre Godard, Julien Durinck, Sandrine Brochard
Summary: Nanotwinned metals exhibit a surprising combination of ultrahigh strength and high ductility. Atomistic simulations in gold were performed to study interactions between coherent twin boundaries (CTBs) and incoherent twin boundaries (ITBs), and it was found that the mechanical behavior of samples with twin boundaries separated by distances less than a critical distance can be affected. The displacement fields and elastic strains introduced by the twin boundaries were also analyzed.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Zhaoyang Hou, Sai Zhou, Yuan Niu, Fenglong Wang, Pengfei Zou, Gang Shi, Lei Gao, Kejun Dong
Summary: The effect of twin spacing on the mechanical behavior and deformation mechanism of nanotwinned Al with high stacking fault energy (SFE) is investigated. It is found that for nanotwinned Al with small grain size, a strengthening-softening transition occurs as the twin spacing decreases, while for nanotwinned Al with large grain size, a continuous strengthening is observed. The different mechanical behaviors and deformation mechanisms are attributed to the ratio of stable SFE to unstable SFE in nanotwinned Al.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Physics, Multidisciplinary
Alberto Mercurio, Shilan Abo, Fabio Mauceri, Enrico Russo, Vincenzo Macri, Adam Miranowicz, Salvatore Savasta, Omar Di Stefano
Summary: Pure dephasing is important for both spectroscopy and quantum information technology, and often leads to decay of quantum correlations. We investigate how pure dephasing of one component of a hybrid quantum system affects the dephasing rate of system transitions. We find that the interaction in a light-matter system significantly affects the stochastic perturbation describing the dephasing of a subsystem, depending on the gauge adopted.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Jae-Deuk Kim, Siva Prasad Murugan, Seong-Woo Choi, Yutaka S. Sato, Jae-Keun Hong, Changwook Ji, Chang-Sub Kwak, Yeong-Do Park
Summary: The mechanical properties of commercially pure titanium can be improved through grain refinement, but welding fine-grained materials is challenging due to grain coarsening. Friction stir welding is a promising process, and this research focuses on friction stir welding of fine-grained and ultra-fine-grained commercially pure titanium. The microstructural features of the base metals play a significant role in the microstructural evolution of the stir zone during the welding process.
Article
Materials Science, Multidisciplinary
Mo-Rigen He, Ruopeng Zhang, Rohan Dhall, Andrew M. Minor, Kevin J. Hemker
Summary: This study investigates the microstructural evolution in nanotwinned Ni-Mo-W alloys under in situ heating experiments using a transmission electron microscope. Migration of twin boundaries and grain boundaries, as well as formation of carbide precipitates, are observed and characterized at atomic resolution. The results show that these transformations occur at temperatures about 200 degrees C lower in Mo-rich specimens compared to W-rich specimens, highlighting the different effects of Mo and W solutes in stabilizing the nanotwinned structure.
MATERIALS RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Ziyi Xu, Yushan Ni
Summary: Through nanoindentation, the effect of kink-like defects on twin boundaries in BCC Ta materials was studied. It was found that twin boundaries enhanced indenter load and hardness in perfect twin boundaries (PTB), but reduced them in defective twin boundaries (DTB) due to intrinsic kink-like defects. Surface morphology analysis showed that the relative sink-in depth was lower in DTB compared to PTB but higher than in single crystal (SC). Examination of atomic images at different stages revealed that kink-like defects in DTB performed two opposite functions: acceleration and delay. The findings provide insight into the influence of intrinsic kink-like defects in BCC nanotwinned materials.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
J. Pan, Y. Lin, J. Zhang, W. Huang, Y. Li
Article
Chemistry, Physical
W. Cui, J. Pan, D. J. Blackwood, Y. Li
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Materials Science, Multidisciplinary
Yi Liu, Jie Pan, Li Li, Honghui Cheng
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2019)
Article
Materials Science, Ceramics
F. H. Duan, J. Pan, Y. Lin, Y. Li
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2019)
Article
Nanoscience & Nanotechnology
R. Q. Cao, J. Pan, Y. Lin, Y. Li
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Chemistry, Physical
Y. H. Meng, F. H. Duan, J. Pan, Y. Li
Article
Materials Science, Multidisciplinary
Ruqing Cao, Qin Yu, Jie Pan, Yan Lin, Andrew Sweet, Yi Li, Robert O. Ritchie
Article
Multidisciplinary Sciences
J. Pan, Yu. P. Ivanov, W. H. Zhou, Y. Li, A. L. Greer
Article
Materials Science, Multidisciplinary
Yan Lin, Qin Yu, Jie Pan, Fenghui Duan, Robert O. Ritchie, Yi Li
Article
Chemistry, Physical
F. X. Bai, S. J. Zheng, Y. X. Wang, J. Pan, J. H. Yao, Y. Li
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Nanoscience & Nanotechnology
Yan Lin, Fenghui Duan, Jie Pan, Cheng Zhang, Qi Chen, Junyong Lu, Lin Liu
Summary: A gradient structure transitioning from coarse-grained Ni to nanocrystalline/amorphous Ni-P alloy has been designed to improve adhesion performance of electrodeposited Ni-P coatings. The gradient-structured Ni-P coatings on CuCrZr alloy substrate exhibit significantly higher interface shear strength and bending strength, which are increased by 90% and 60% respectively compared to conventional monolithic-structured Ni-P coatings.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Li-Xue Liu, Jie Pan, Cheng Zhang, Jing-Yu Xu, Rong Guo, Lin Liu
Summary: This study reveals the preparation of a high entropy alloy with complex geometry and superior mechanical properties through selective laser melting. The rapid solidification rate during the process induces a hierarchical structure, contributing to excellent mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xiaoyi Cuan, Yan Lin, Zehui Liu, Bo Zhang, Ning Li, Jie Pan
Summary: The impact toughness of A/C Ni-P/Ni laminates is significantly influenced by the thickness of the amorphous Ni-P layer, with thin layers exhibiting high impact energy and thick layers being more susceptible to impact damage.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Metallurgy & Metallurgical Engineering
Pan Jie, Duan Fenghui
Summary: Metallic glasses are a subject of interest in condensed physics and materials science due to their unique structure and properties. Rejuvenation is a process that transforms the material back to a higher-energy state, significantly expanding the energy range and improving deformation capability.
ACTA METALLURGICA SINICA
(2021)