Article
Materials Science, Multidisciplinary
Christiane Kienl, Fernando D. D. Leon-Cazares, Catherine M. F. Rae
Summary: This study discusses the deformation mechanisms during high temperature compression tests of the Ni-base superalloy ATI 718Plus (R). Deformation twins were observed in deformed grains at various temperatures and strain rates using transmission electron microscopes (TEM). The low stacking fault energy of the alloy was found to cause the formation of deformation twins. Additionally, early stages of twin formation were captured, including emission of twinning partials from grain boundaries and the formation of partials through cross-slip events.
Article
Nanoscience & Nanotechnology
S. Shyamal, M. Ghiasabadi Farahani, T. Allam, A. S. Hamada, C. Haase, J. Komi, P. C. Chakraborti, P. Sahu
Summary: In a medium Mn austenitic steel containing precipitates, twin nucleation is influenced by unfaulting dislocation reaction near the precipitates, while twinning is activated farther from the precipitates. The formation of twin nuclei involves the creation of stacking faults through classical dislocation dissociation, followed by overlapping of these stacking faults through a non-classical mechanism to form a three-layer twin nucleus.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Zijian Zhou, Rui Zhang, Chuanyong Cui, Yizhou Zhou, Xiaofeng Sun, Jinglong Qu, Yu Gu, Jinhui Du, Yi Tan
Summary: Deformation twinning is an important mechanism in nickel-based superalloys. In this study, the formation of microtwins at high temperatures in Ni-Co-based superalloys was investigated using transmission electron microscopy. The results showed that the formation of microtwins at high temperatures can be attributed to the low stacking fault energy and poor dislocation-driven deformations caused by the high strain rate in specific directions.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Valery V. Borovikov, Mikhail I. Mendelev, Timothy M. Smith, John W. Lawson
Summary: MD simulations show that a different mechanism for twin nucleation and growth can compete with the Kolbe mechanism in the temperature range of 600-800 degrees C.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Junheng Gao, Suihe Jiang, Haitao Zhao, Yuhe Huang, Huairuo Zhang, Shuize Wang, Guilin Wu, Yuan Wu, Honghui Wu, Albert Davydov, William Mark Rainforth, Zhaoping Lu, Xinping Mao
Summary: By massive nano-precipitation, the grain sizes of a near medium Mn austenitic steel were successfully refined, leading to a transition of deformation mechanism and achieving a unique combination of high strength and large elongation.
Article
Nanoscience & Nanotechnology
Young-Bum Chun
Summary: Different carbon concentrations were added to Fe-18Mn-9Cr-2Al steels to investigate their microstructures and tensile properties. The carbon-added steels exhibited extensive work-hardening and ductility at room temperature, while dynamic recrystallization occurred partially at grain boundaries at higher temperatures. The addition of chromium did not significantly affect the plasticity of the steels, suggesting the potential for developing Cr-bearing TWIP steels with corrosion resistance and excellent formability.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Peter J. Blau
Summary: Sliding wear damage on non-lubricated metallic bearing surfaces is caused by the dissipation of frictional work, presenting different damage features depending on alloy-specific deformation modes and microstructural properties. Metal pairs with similar friction coefficients may not wear equally due to differences in energy partition. The transition in wear mechanisms is influenced by composition and surface processing methods.
Article
Materials Science, Multidisciplinary
Jingfan Zhang, Dengshan Zhou, Xueyong Pang, Bowen Zhang, Yue Li, Binhan Sun, Ruslan Z. Valiev, Deliang Zhang
Summary: By manipulating the grain size and alloying with yttrium, we have achieved the simultaneous formation of deformation twins and 9R structure in an Al-Mg alloy. Our study presents a new microstructure design strategy for strengthening bulk aluminum alloys through deformation twins and 9R structure and/or stacking faults.
Article
Nanoscience & Nanotechnology
Avanish Kumar Chandan, Premkumar Murugaiyan, Sandip Ghosh Chowdhury
Summary: This study investigated the deformation behavior and tensile properties of a new high-entropy alloy at room temperature and -100 degrees C. The results showed that the slip configuration transitioned from wavy to planar with decreasing temperature, and deformation twinning only occurred at -100 degrees C. The stacking fault energy of the alloy at -100 degrees C was determined using transmission electron microscopy, while it could not be estimated at room temperature. Activation of planar slip-induced dislocation features at -100 degrees C improved the work hardening and tensile properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Naveen Manhar Chavan, P. Sudharshan Phani, M. Ramakrishna, L. Venkatesh, Prita Pant, G. Sundararajan
Summary: Cold spray deposition involves unique combination of high strain rate and moderate to high strain deformation, leading to significant grain refinement and deformation twinning in Cu and Cu-Al alloys. Experimental observations align well with theoretical predictions, showing significant heterogeneity in cold spray coatings and identifying factors influencing hardness. Twin mediated deformation mechanism is found to explain the lower boundary strengthening in presence of fine twins.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
L. Claeys, T. Depover, K. Verbeken
Summary: The hydrogen embrittlement sensitivity of three twinning-induced plasticity steels was investigated. The addition of aluminium and increased manganese content were found to affect the hydrogen solubility and diffusivity, as well as the mechanical properties of the steels. Aluminium addition led to increased resistance to hydrogen, while manganese addition reduced the resistance, despite having the same stacking fault energy. The critical hydrogen concentration may be higher with the addition of aluminium.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Le Li, Zhenghao Chen, Koretaka Yuge, Kyosuke Kishida, Haruyuki Inui, Martin Heilmaier, Easo P. George
Summary: The plastic deformation behavior of equiatomic Cr-Fe-Co-Ni medium-entropy alloy was investigated through compression and tension experiments. The critical resolved shear stress (CRSS) for {111}<1((1)over bar)0> slip was found to be 44-45 MPa at room temperature without significant tension-compression asymmetry. The CRSS increased rapidly with decreasing temperature, but the temperature dependence dulled below 77 K due to the inertia effect. The 0 K CRSS was determined to be 200 MPa, higher than Cr-Mn-Fe-Co-Ni high-entropy alloy but lower than Cr-Co-Ni medium-entropy alloy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Yujie Chen, Dengke Chen, Xianghai An, Yin Zhang, Zhifeng Zhou, Song Lu, Paul Munroe, Sam Zhang, Xiaozhou Liao, Ting Zhu, Zonghan Xie
Summary: The emergence of multi-principal element alloys (MPEAs) brings great promise for high performance metallic materials. This study reports a new deformation mechanism of mechanically-induced dual phase transformations in the CrCoNi medium-entropy alloy, showing the potential for enhancing the mechanical properties of advanced alloys.
Article
Materials Science, Multidisciplinary
Ranming Niu, Xianghai An, Linlin Li, Zhefeng Zhang, Yiu-Wing Mai, Xiaozhou Liao
Summary: By adjusting the Al content in Cu-Al alloys to control stacking fault energy (SFE), the mechanical properties and deformation mechanisms of the materials can be manipulated. The study revealed that the influence of sample size on strength decreased with decreasing SFE or increasing Al content, and a theoretical model was proposed to explain this size dependency.
Article
Materials Science, Multidisciplinary
Ci Wang, Stephan Schonecker, Wei Li, Yaochun Yang, Qing-Miao Hu, Levente Vitos
Summary: Using density-functional theory, we determined the generalized stacking fault energy for the twinning system in Fe and Fe-Cr alloys, showing that the isosceles twin boundary configuration is energetically preferred. The magnetic ordering effects and Cr content have significant influences on the twin boundary formation and migration energies in different magnetic states.
Article
Chemistry, Multidisciplinary
Guowei Wang, Guikai Zhang, Xiaoxing Ke, Xiangyu Chen, Xu Chen, Yueshuai Wang, Guoyu Huang, Juncai Dong, Shengqi Chu, Manling Sui
Summary: Metallic MoS2 (1T-MoS2) is a promising precious-metal-free electrocatalyst with excellent hydrogen evolution reaction (HER) performance in acidic media. However, its sluggish HER kinetics in alkaline media and inability for the oxygen evolution reaction (OER) hinder its development as bifunctional catalysts. This study successfully addresses the challenge of 1T-MoS2 synthesis using a direct one-step hydrothermal method, resulting in flower-like 1T-MoS2 morphology. The doping of transition metals (Ni, Co, Fe) into 1T-MoS2 enhances its bifunctional catalytic activity, with Ni-1T-MoS2 demonstrating the highest HER/OER performance in alkaline media. Finally, a Ni-1T-MoS2||Ni-1T-MoS2 electrolyzer is fabricated, achieving a high current density for overall water splitting at a low applied cell voltage.
Review
Chemistry, Multidisciplinary
Zelin Wang, Xiaoxing Ke, Manling Sui
Summary: This mini-review summarizes recent progress on revealing 3D structures of electrocatalysts using 3D electron tomography. It discusses the information that can be revealed at nanoscale and atomic scale, and explores the application of this technique in durability investigation and post-treatment of electrocatalysts.
FRONTIERS IN CHEMISTRY
(2022)
Review
Physics, Condensed Matter
Xiaomei Wu, Xiaoxing Ke, Manling Sui
Summary: This review summarizes recent studies on advanced transmission electron microscopy (TEM) characterizations of halide perovskites. It covers topics such as irradiation damage under conventional imaging conditions, low-dose TEM, atomic-resolution imaging, defects identification, chemical mapping, cryo-TEM, and in-situ TEM for degradation study. These characterizations help in understanding the structure-property relationship and degradation mechanism of halide perovskites, and aid in the design of more efficient and robust energy materials.
JOURNAL OF SEMICONDUCTORS
(2022)
Article
Chemistry, Multidisciplinary
Jiangshan Qu, Yueshuai Wang, Xulin Mu, Jingcong Hu, Bin Zeng, Yue Lu, Manling Sui, Rengui Li, Can Li
Summary: The crystallographic orientation and exposed facets of anatase TiO2 nanocrystals have been a subject of conflicting conclusions. This study clarifies the misleading conclusions by using anatase TiO2 nanocrystals with highly exposed {001} facets as a model, revealing the coexistence of {001} and {111} facets due to their similar lattice fringes and intersection angles. Furthermore, a paradigm based on transmission electron microscopy (TEM) analysis is provided as a universal methodology for determining the crystallographic orientation and exposed facets of nanomaterials.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Zeyu Zhang, Qingde Sun, Yue Lu, Feng Lu, Xulin Mu, Su-Huai Wei, Manling Sui
Summary: The authors report hydrogenated lead-free inorganic perovskite solar cells with enhanced power conversion efficiency. By using a hydrogenation method, the bandgap of Cs2AgBiBr6 films could be tunable from 2.18 eV to 1.64 eV, resulting in improved photoelectric conversion efficiency of the solar cells.
NATURE COMMUNICATIONS
(2022)
Review
Chemistry, Multidisciplinary
Wang Guowei, Ke Xiaoxing, Sui Manling
Summary: Clean energy innovation has led to the development of single-atom catalysts (SACs) with excellent catalytic activity, high tunability, and low cost. Aberration-corrected transmission electron microscopy (TEM) has become an essential tool for directly visualizing single atoms in SACs. This review summarizes recent studies on SACs using advanced TEM, focusing on TEM methods for SACs characterization, applications in SAC characterization, and the increasing importance of in-situ TEM for understanding catalytic mechanisms. The perspectives of TEM for SACs are also discussed.
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
(2022)
Article
Materials Science, Multidisciplinary
Mingchao Yu, Zhenxi Guo, Xin Meng, Yongtao Chen, Jidong Yu, Manling Sui
Summary: This study reveals six novel phase transformation variants related to the reversible phase transformation in iron using two conventional electron microscopy techniques. The essential differences in microstructure between deformation area and phase transformation area are also revealed. Two fast and efficient methods for identifying the occurrence of reversible phase transformation using electron microscopy techniques are proposed.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Chenghao Bi, Zhiwei Yao, Jingcong Hu, Xingyu Wang, Mengqi Zhang, Shuyu Tian, Aqiang Liu, Yue Lu, Nora H. de Leeuw, Manling Sui, Jianjun Tian
Summary: This study reports a design that achieves high efficiency and stability in pure-blue perovskite light-emitting diodes (PeLEDs) by suppressing Auger recombination through the use of inorganic ligands replacing organic ligands. The design allows for a much lower efficiency roll-off and maintains high efficiency even at high luminance, which is of considerable significance for display applications.
ACS ENERGY LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Jingcong Hu, Chenghao Bi, Xuetao Zhang, Yue Lu, Wencai Zhou, Zilong Zheng, Ying Tang, Feng Lu, Zhiwei Yao, Bohai Tian, Xiaoyong Wang, Karuppaiah Selvakumar, Jianjun Tian, Manling Sui
Summary: Reducing the dimensionality of metal halide perovskite into two-dimensional or one-dimensional nanostructures expands its spectral absorption or emission range. This study successfully synthesized one-dimensional OA-CsPbI3 nanowires, which exhibit monochromatic yellow light emission and high photoluminescence quantum yield.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Applied
Zhengfeng Zhang, Changdong Qin, Kuan Wang, Xiao Han, Jinhui Li, Manling Sui, Pengfei Yan
Summary: The cathode electrolyte interphase (CEI) layer is crucial for the electrochemical performance of lithium-ion batteries. By employing diverse characterization techniques, we systematically investigate the dynamic evolution of the CEI layer and its critical impact on the cycling performance of LiCoO2 cathode. We find that cycling voltage plays a key role in CEI formation and evolution, and a critical potential of 4.05 V is identified as the switching point between CEI deposition and decomposition.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Yuyuan Jiang, Yuyang Lu, Zhengfeng Zhang, Lige Chang, Jinhui Li, Xiao Han, Lin Gan, Yong Ni, Manling Sui, Pengfei Yan
Summary: This study reveals the failure mechanism of LiCoO2 cathode, indicating that misfit strain plays a dominant role in the surface layer exfoliation process. Highly strained LiCoO2 surface can initiate massive surface cracks, causing the LiCoO2 surface layer to break and exfoliate. Mechanical cracking coupled with chemical etching exacerbates the surface layer degradation, resulting in a weathering-like degradation on the LiCoO2 surface. This research highlights that the interfacial degradation of electrode materials is a complex physicochemical process.
MATERIALS RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Xulin Mu, Xiaojuan Hui, Mingming Wang, Kuan Wang, Yan Li, Yuefei Zhang, Manling Sui, Pengfei Yan
Summary: In this study, twin boundaries (TBs) were quantitatively estimated and characterized using advanced electron microscopy. It was further validated that TBs can initiate massive cracks during electrochemical cycling, leading to performance decay of LiNiO2. While adjusting synthesis conditions cannot avoid TB formation, it was found that a coprecipitation method can effectively eliminate TBs, resulting in improved cycling stability of LiNiO2. The coprecipitation method was also used to synthesize TB-free LiCoO2, demonstrating improved cycling stability.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Guowei Wang, Manchen Zhang, Guikai Zhang, Zelin Wang, Xu Chen, Xiaoxing Ke, Changhao Wang, Shengqi Chu, Manling Sui
Summary: This study proposes an innovative approach to synthesize dual-atomic-site alloy (DASA) through two-step pyrolysis, avoiding the challenges of sintering and alloying on metal hosts. The approach is demonstrated by synthesizing Ir1Ni1@Co/N-C DASA, which exhibits outstanding bifunctional oxygen reduction/evolution reaction (ORR/OER) performance in both acidic and alkaline media. The density functional theory (DFT) calculations further reveal the regulation of adsorption-free energies of intermediates by Ir1 and Ni1 on Co.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Xulin Mu, Kai Huang, Genxiang Zhu, Yan Li, Conghui Liu, Xiaojuan Hui, Manling Sui, Pengfei Yan
Summary: Exploring the structure transformation mechanism of spent cathodes during regeneration is crucial for optimizing the processing protocol. Different operation histories result in spent cathode materials with different states of health (SOH), posing a challenge for simultaneous restoration. In this study, we investigated the effects of SOH on the direct regeneration protocol for spent LiCoO2 (LCO) cathodes. We identified lithium-deficiency and Al impurity as important factors impacting the regeneration quality of spent LCO, causing void defects, disordered lattice structures, and the diffusion of Al impurity during high temperature sintering. Based on our understanding of the regeneration process, we optimized the protocol to successfully restore spent LCO with different SOH.
Article
Chemistry, Multidisciplinary
Jingsi Song, Hongpeng Liu, Wenhua Pu, Yue Lu, Zhixiang Si, Zeyu Zhang, Yang Ge, Nengxu Li, Huanping Zhou, Wei Xiao, Ligen Wang, Manling Sui
Summary: The study reveals that modifications at the interface between the electron transport layer (ETL) and the perovskite layer can improve the long-term thermal stability of PSCs, and confirms that a preferential thermal decomposition of the perovskite layer at the SnO2-perovskite interface is an adverse factor inducing the performance degradation of PSCs.
ENERGY & ENVIRONMENTAL SCIENCE
(2022)
