Article
Chemistry, Physical
Raju K. Biswas, Swapan K. Pati
Summary: Oxide materials offer a wide range of applications and potential for addressing the energy crisis. The layered solid solution structure of SnO-PbO shows stability and unique properties, making it a promising candidate for high-performance thermoelectric applications.
ACS APPLIED ENERGY MATERIALS
(2021)
Review
Materials Science, Multidisciplinary
Vaclav Sklenicka, Petr Kral, Jiri Dvorak, Marie Kvapilova, Kveta Kucharova
Summary: This review focuses on the creep behavior and properties of nanostructured materials, which may differ from their coarse-grained counterparts. The effect of different SPD processing methods on creep resistance at high temperatures is evaluated through extensive tensile creep tests on selected complex metallic materials. The creep characteristics of these materials are compared with unprocessed conditions, revealing that SPD processing mostly does not significantly improve creep resistance in complex materials. The stress dependence of creep rate and creep life suggests similar creep deformation mechanisms in ultrafine-grained materials compared to coarse-grained materials, but the creep mechanisms in SPD processed materials remain unclear due to the complexity of the phenomenon and limited number of studies conducted.
MATERIALS TRANSACTIONS
(2023)
Article
Chemistry, Physical
P. Snopinski
Summary: A submicrometer-grained microstructure was fabricated in an additively produced AlSi10Mg aluminium alloy through Equal Channel Angular pressing at 150 C. The alloy matrix exhibited predominant deformation mechanism of dislocation slip, and the heterogeneous microstructure activated another important mesoscale deformation mechanism – the plastic deformation gradient. TEM analysis provided evidence for deformation twinning of the hard Si phase and deformation-induced amorphisation of the Si phase. The synergy of different deformation modes leads to a good balance between strength and ductility and offers new possibilities for the development of structural materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Applied
Zhihua Wang, Tuanwei Zhang, Enling Tang, Renlong Xiong, Zhiming Jiao, Junwei Qiao
Summary: Bulk large-gradient nanostructured NiCoCrFe high-entropy alloys with millimeter-scale gradient layer were prepared by supersonic Taylor impact. The microstructure evolution over a wide range of strain rates (10(-3)-10(5)/s) was characterized, and the formation mechanism of nanocrystals with well-defined boundaries at high strain rate (> 10(4)/s) was identified to be the emerging, thickening, and mutual intersection of lattice rotation bands, high-density dislocation bands, and deformation twins. This Letter not only reveals the deformation mechanisms of high entropy alloys under a wide range of strain rates but also provides an idea that could be applied to the preparation of bulk gradient nanostructured materials.
APPLIED PHYSICS LETTERS
(2021)
Article
Metallurgy & Metallurgical Engineering
R. Z. Valiev, E. I. Usmanov, L. R. Rezyapova
Summary: Ultrafine grained (UFG) metallic materials obtained by severe plastic deformation (SPD) exhibit very high strength properties, which can be attributed to the formation of UFG structure as well as other nanostructural features such as dislocation substructures, nanotwins, and nanosized precipitates of second phases. In addition, the structure and condition of grain boundaries, including their nonequilibrium state and the presence of grain boundary segregations, significantly contribute to the hardening of materials. Various approaches are discussed in this study to achieve high strengths in metallic materials by SPD.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Nanoscience & Nanotechnology
Hiromi Miura, Chihiro Watanabe, Yoshiteru Aoyagi, Yojiro Oba, Masakazu Kobayashi, Naoki Yoshinaga
Summary: A stable SUS316LN austenitic stainless steel was cold-rolled to 92% reduction to form a complicated heterogeneous nanostructure. The material showed high tensile strength along the transverse direction, and peak aging further increased the strength. Grain-boundary segregation and the nano-lamellar structure contributed to the high strengthening effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Spencer Doran, Yonggang Yan, Liuqing Yang, Jae-Kyung Han, Di Chen, Kun Wang, Youxing Chen, Megumi Kawasaki, Tianyi Chen
Summary: Nanocrystalline materials often experience radiation-enhanced grain coarsening, but high entropy alloys (HEA) may have superior radiation tolerance due to their intrinsic sluggish diffusion. In this study, CoCrFeNiMn HEA samples were processed via high-pressure torsion (HPT) to form nanograins with unsaturated and saturated plastic deformation. After Ni ion irradiation, grain growth was observed in both samples, but the 8T sample showed stronger radiation tolerance. This resistance is attributed to a unique nanodomain microstructure formed within the radiation-coarsened grains of the 8T sample.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
N. Forouzanmehr, H. R. Jafarian, M. Samadi-khoshkhoo, M. Boenisch, M. Nili-Ahmadabadi
Summary: The study found that commercially pure Fe undergoes a drastic increase in strength in the early stages of deformation, followed by shear banding causing a decrease in work hardening rate and ultimately reaching a steady state at medium strains, resulting in a bimodal microstructure.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
H. Z. Zhao, Z. S. You, N. R. Tao, L. Lu
Summary: The study found that the strengthening effect of nanotwins in heterogeneous nanostructure is not only dependent on the strength of themselves, but also influenced by the deformation compatibility with surrounding components. Orientation-dependent deformation compatibility was attributed to the interactions between isotropic shear bands in nanograin matrix and anisotropic deformation in nanotwin bundles.
Article
Multidisciplinary Sciences
Shufen Chu, Pan Liu, Yin Zhang, Xiaodong Wang, Shuangxi Song, Ting Zhu, Ze Zhang, Xiaodong Han, Baode Sun, Mingwei Chen
Summary: In this study, the authors report real-time atomic-scale observations of grain boundary dislocation climb in nanostructured gold at room temperature. The climb of a dislocation is found to occur through stress-induced reconstruction of neighboring atomic columns. The proposed atomic route of dislocation climb is energetically favorable, as demonstrated by Monte Carlo simulations. The in situ observations also reveal the significance of grain boundary dislocation climb in controlling the microstructures and properties of nanostructured metals.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Xin Chen, Chuming Liu, Yingchun Wan, Shunong Jiang, Zhiyong Chen, Yonghao Zhao
Summary: Gradient nanostructured AZ31B Mg alloy rods were prepared via cold rotary swaging, with grain refinement mechanisms explored during deformation. The results revealed that the gradient microstructure along the radial direction was mainly formed by different loading modes.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Youngkyu Hwang, Anupam Sadhu, Sangho Shin, Shin Woei Leow, Ze Zhao, Jingyu Deng, Joshua A. Jackman, Munho Kim, Lydia H. Wong, Nam-Joon Cho
Summary: This study reports the fabrication of a flexible substrate made from pollen, which exhibits high transparency (>92%) and high haze (>84%), with optical properties that are tunable and arise from light-matter interactions with the spiky surface of pollen particles. The pollen substrate, readily obtained from nature and requiring minimal extraction or processing, can be incorporated into optoelectronic applications such as functional perovskite solar cells.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Rong Li, Wenge Chen, Kai Zhou, Yana Yang, Longlong Dong, Ahmed Elmarakbi, Yong-Qing Fu
Summary: Tungsten skeleton reinforced copper matrix composites (TRC) were fabricated using selective laser melting (SLM) and infiltration sintering. The deformation and fracture mechanisms were found to vary at different temperatures, including cleavage of tungsten, intergranular fracture of tungsten particles, tearing of copper, and separation between copper and tungsten.
Article
Materials Science, Multidisciplinary
Shuozhi Xu, Justin Y. Cheng, Nathan A. Mara, Irene J. Beyerlein
Summary: Crystalline materials can be strengthened by introducing dissimilar phases as dislocation barriers, but this often decreases their ductility. Heterogeneous nanostructured materials (HNMs) have emerged as a potential solution to the strength-ductility dilemma, due to their unique mechanical properties. However, characterizing dislocation dynamics in HNMs has been challenging using classical continuum models. In this study, a phase-field dislocation dynamics (PFDD) model was developed to analyze multi-phase materials and investigate the interactions between dislocations and obstacles as well as dislocations and interfaces. The results reveal that the interactions between dislocations and heterogeneous obstacles cannot be simply interpolated from individual interactions, and materials with interfaces of nanoscale thickness and compositional gradients exhibit higher dislocation bypass stress. This explains the high strength and toughness observed in thick interface-containing nanolaminates.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Review
Materials Science, Multidisciplinary
Ruslan Z. Valiev, Boris Straumal, Terence G. Langdon
Summary: The past decade has seen significant advances in severe plastic deformation techniques, leading to the development of new and superior properties in various materials. The concept of nanostructural design for metals and alloys has been proposed to enhance material performance and applications.
ANNUAL REVIEW OF MATERIALS RESEARCH
(2022)
Article
Engineering, Mechanical
Dahye Shin, Dongchan Jang
INTERNATIONAL JOURNAL OF PLASTICITY
(2020)
Article
Materials Science, Multidisciplinary
Hadi Ghaffarian, Dongchan Jang
JOURNAL OF NUCLEAR MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Byeong Seo Kong, Jiho Shin, Gokul Obulan Subramanian, Junjie Chen, Changheui Jang, Ye-eun Na, Dongchan Jang, Ho Jung Lee, Jun-Seog Yang
SCRIPTA MATERIALIA
(2020)
Article
Chemistry, Physical
Taeyoung Jeon, Ye-Eun Na, Dongchan Jang, Il Won Kim
Article
Engineering, Mechanical
Daehyeok Ahn, Dae-Gon Kim, Hansuek Lee, Dongchan Jang
EXTREME MECHANICS LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Dahye Shin, Dong Gyu Kang, Kie Young Woo, Yong-Hoon Cho, Seung Min Han, Dongchan Jang
Summary: In this study, a new approach to control the friction of amorphous carbon through the transition of deformation mode on nanopatterned surfaces is presented. Depending on the topography of the nanopatterns, the mechanical responses of the surfaces change from elastic fracture to plastic flow, resulting in a 5-fold change in the friction coefficient without manipulation of the material's intrinsic structure.
Review
Chemistry, Multidisciplinary
Gwangmin Bae, Dongchan Jang, Seokwoo Jeon
Summary: Nanoarchitected materials, which combine nanomechanical size effects with conventional structural engineering, exhibit unique mechanical properties. The proximity-field nanopatterning (PnP) technique allows high spatial resolution and mass producibility in synthesizing inch-scale films of nanoarchitected materials. This review focuses on the feasibility of using PnP as a scalable fabrication technique for three-dimensional nanostructures and the superiority of resulting thin-shell oxide nanoarchitected materials for specific applications.
Article
Chemistry, Multidisciplinary
Gwangmin Bae, Gwang-Mun Choi, Changui Ahn, Sang-Min Kim, Wonsik Kim, Youngjun Choi, Dawon Park, Dongchan Jang, Jung-Wuk Hong, Seung Min Han, Byeong-Soo Bae, Seokwoo Jeon
Summary: The new hybrid nanocomposite material combines organic-inorganic hybrid material with continuous and ordered 3D inorganic nanoshell as additional reinforcement, resulting in metal-like hardness, excellent impact resistance, good flexibility, and high transparency in the visible regions.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Byeong Seo Kong, Ji Ho Shin, Changheui Jang, Ye-eun Na, Dongchan Jang, Ho Jung Lee, Jun-Seog Yang
Summary: After thermal ageing at 400 degrees C for 20,000 h and subsequent proton irradiation up to 10 displacement per atom (dpa) at 360 degrees C, spinodal decomposition and G-phase precipitation were observed in the austenitic stainless steel weld, with proton irradiation enhancing these effects.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Ji Ho Shin, Byeong Seo Kong, Hyun Joon Eom, Changheui Jang, Hyeonsu Do, Dongchan Jang
Summary: An austenitic stainless steel with high density of nanosized NbC precipitates was tested using micropillar compression tests. The study observed the dissolution and reprecipitation of NbC precipitates during compressive deformation, leading to modifications of existing strengthening models for more accurate predictions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Hyun Joon Eom, Ji Ho Shin, Byeong Seo Kong, Chaewon Jeong, Changheui Jang, Daehyeok Ahn, Dongchan Jang
Summary: The strengthening effect of nanosized NbC precipitates distributed in the matrix of an austenitic stainless steel was studied. Micro pillar compression tests showed that the strengthening effect was lower than expected, despite the higher number density of NbC precipitates in the alloy. Post-mortem microstructure analysis revealed extensive dissolution and re-precipitation of NbC precipitates in the deformed micro-pillars, along with the presence of stacking faults and deformation twin near the precipitates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Hadi Ghaffarian, Dongchan Jang
Summary: Molecular dynamics simulation was used to investigate the anisotropic mobility behavior of hexagonal dislocation networks (HDNs) in bicrystalline pure Fe samples. The study found that the mobility of HDN is mainly controlled by characteristic dislocations located near the HDN. Furthermore, the underlying mechanism of HDN shearing was elucidated, with the variation of <001> dislocation lines' length and core energy with HDN misorientation angle playing a key role.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
JongDae Hong, Daehyeok Ahn, Dongchan Jang, Hongryul Oh, JaeYong Kim, Hyochan Kim, Martin Sevecek
Summary: After the Fukushima accident, there has been a push to develop accident tolerant fuel (ATF) cladding to enhance safety under accident conditions. Many countries have focused on surface-modified Zr cladding, such as Cr or Cr-Al alloy coated Zr-alloy cladding, as a short-term solution. However, there is currently no mechanical properties data available for the thin coated layer. In this study, small scale mechanical test techniques were introduced to evaluate the mechanical properties of the thin coated layer, and the results showed that the measured properties were equivalent to the bulk properties, indicating the potential usefulness of these small-scale tests for reliable fuel performance assessment of coated ATF cladding.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
JiEung Kim, Sangmin Lee, Chang-Yeon Gu, Taek-Soo Kim, Hyunjoon Kong, Dongchan Jang
Summary: This study aims to investigate the quasistatic tensile behavior of reconstituted collagen hydrogels under uniaxial tensile stresses. The evolution of the collagen fiber network structures with straining is visually observed using confocal microscope. The deformation mechanism transitions from the unfolding of initially undulated fibers to the stretching of fibers through network alignment to the tensile direction.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Woojin An, Jaewon Heo, Dongchan Jang, Kwang Jun Euh, Im Doo Jung, Sangshik Kim, Hyokyung Sung
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
(2020)