Review
Metallurgy & Metallurgical Engineering
Ke Wang, Honghui Li, Yu Zhou, Jingfeng Wang, Renlong Xin, Qing Liu
Summary: Studying the deformation mechanism of titanium alloys is important for understanding the relationship between microstructure and mechanical properties. Slip is the dominant deformation mechanism in most titanium alloys, and factors such as phase content, grain size, and alpha/beta orientation relationship affect slip initiation and transfer behavior. This review analyzes the sequence of slip initiation, the rule of slip transfer, and the mechanism of crack nucleation in titanium alloys, providing insight into the complex plastic deformation mechanism.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Jing Wang, Yongqing Zhao, Wei Zhou, Qinyang Zhao, Shixing Huang, Weidong Zeng
Summary: The study found that a new metastable beta titanium alloy undergoes stress-induced martensite and mechanical twins during tensile deformation, leading to further work hardening. The crystallographic orientation influences the deformation and fracture behaviors, causing stress concentration and inhomogeneous deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Conghui Liu, Rhys Thomas, Tianzhu Sun, Jack Donoghue, Xun Zhang, Tim L. Burnett, Joao Quinto da Fonseca, Michael Preuss
Summary: In this study, the relationship between plastic slip activity and fatigue crack initiation was investigated in a near-alpha titanium alloy. The findings showed that plasticity at low stress levels was dominated by basal slip and two types of cracking were observed parallel to basal slip traces. Detailed analysis revealed the mechanisms behind the crack initiation, such as out-of-plane Burgers vector activity and crystallographic facet formation. A new parameter was developed based on the geometric factors to predict transgranular surface crack initiation sites.
Article
Nanoscience & Nanotechnology
Jing Wang, Yongqing Zhao, Wei Zhou, Qinyang Zhao, Chao Lei, Weidong Zeng
Summary: The study found that the metastable beta titanium alloy exhibits various deformation modes during tensile process, including dislocation slip, phase interface shear, and grain boundary shear. Due to localized stress concentration and inhomogeneous deformation, microvoids are prone to form at positions such as grain boundaries, phase interfaces, tips of beta interlayers, etc. Additionally, crack propagation follows a zigzag path resulting in an intergranular and transgranular mixed fracture mode.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Mechanical
Yijing Wang, Yulong An, Guoliang Hou, Xiaoqin Zhao, Huidi Zhou, Jianmin Chen
Summary: This study investigates the microstructure regulation of Ti6Al4V alloy and its influence on crack propagation behavior under ultrasonic cavitation. The results show that due to the existence of fewer slip systems, higher hardness and elastic resilience of alpha phase, as well as the presence of substructures, it is difficult to initiate and propagate cracks in the alpha phase during cavitation erosion compared to the beta phase. The Ti6Al4V alloy after heat treatment with air cooling exhibits excellent cavitation erosion resistance, attributed to the precipitation of acicular secondary alpha grains inside the transformed beta phase and the formation of nanotwins in the interface between transformed beta phase and primary alpha phase.
Article
Materials Science, Multidisciplinary
Senzhen Wang, Shun Xu, Chongchen Xiang, Zijian Wang, Hanlin Ding
Summary: This study investigates the mechanisms of <111> dislocation transmission at low angle grain boundaries and high angle grain boundaries in Ti-5553 alloy. It is found that low angle grain boundaries have higher geometric alignment and lower residual Burgers vector magnitude, making them more conducive for dislocation transfer.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Mechanical
Jinlei Shen, Shravan Kotha, Ryan Noraas, Vasisht Venkatesh, Somnath Ghosh
Summary: This paper develops Parametrically Upscaled Constitutive Model (PUCM) and Parametrically Upscaled Crack Nucleation Model (PUCNM) for a commercially used a/6-phase Ti64 alloy to study the influence of microstructure on fatigue crack nucleation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Zhenming Li, Qigui Wang, Liming Peng, Alan A. Luo, Penghuai Fu
Summary: This study investigates the cyclic hardening and softening behavior of peak-aged Mg-Nd-based alloys during low cycle fatigue using transmission electron microscopy. The initial cyclic hardening is attributed to the increase in dislocation density and interaction with nano-scale precipitates. Cyclic softening is a result of dislocation shearing through precipitates and the transformation of precipitates in different stages of fatigue. The competing mechanisms of hardening and softening are present throughout the entire fatigue process, with hardening dominating in the beginning and softening taking over after a certain number of cycles, around 350 cycles.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Yanxi Li, Pengfei Gao, Jingyue Yu, Shuo Jin, Shuqun Chen, Mei Zhan
Summary: In this study, the mesoscale deformation mechanisms of titanium alloy with tri-modal microstructure were investigated using quasi-in-situ tensile tests, SEM, EBSD, and quantitative slip trace analyses. Different slip behaviors and grain boundary sliding were observed in equiaxed alpha (alpha p) and lamellar alpha (alpha l) grains. The study found that crystallographic orientation and geometrical orientation play crucial roles in grain boundary sliding.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Tao Gao, Hongqian Xue, Zhidan Sun, Delphine Retraint, Yanli He
Summary: The fatigue behavior and damage mechanisms of a Ti-8Al-1Mo-1V alloy were investigated in the very high cycle fatigue (VHCF) regime. It was found that the crack initiation area is characterized by nano-marking facets and flat facets induced by slip activity. The large scatter in fatigue life can be attributed to slip inhomogeneity.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Sabrina Vantadori, Andrea Zanichelli, Camilla Ronchei, Daniela Scorza, Andrea Carpinteri
Summary: This paper investigates the crack nucleation location in fretting-affected Al 7050T7451 specimens subjected to partial slip. Experimental evidence suggests that cracks can start within the contact zone rather than just at the trailing edge. A parametric study is conducted to explore four different crack nucleation locations on the contact surface, ranging from the trailing edge to the micro-slip region.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Physical
Tomoyuki Fujii, Tatsuro Sawada, Yoshinobu Shimamura
Summary: This study aims to investigate the nucleation processes of transgranular stress corrosion cracking in aluminum alloy 6061-T651 immersed in NaCl solution. The corrosion phenomena were analyzed based on precipitates, the location and geometry of corrosion pits and cracks, and the crystal orientation where cracking occurred. The results showed that corrosion pits formed on a smooth surface, and stress corrosion cracks tended to originate from deeper pits with high stress/strain concentration along the {1 1 2} crystal plane.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Mechanical
Liangwei Yin, Osamu Umezawa
Summary: The study elucidates the grain-scale dwell fatigue behavior in Ti-Fe-O alloy, focusing on the stress redistribution phenomenon within the soft-hard grain combination. Elastoplastic properties of the beta phase were determined using nanoindentation and crystal plasticity modeling, evaluating the role of intergranular beta lath on stress redistribution. The results show that stress redistribution from the soft to hard grain is inhibited in the presence of intergranular beta lath, leading to enhanced peak stress in the beta lath and potential competition between two dwell fatigue failure modes at high stress state.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Chemistry, Physical
Zhuanni Gao, Leilei Wang, Yanni Wang, Feiyue Lyu, Xiaohong Zhan
Summary: This study explores the application of laser cladding technology to fabricate a high entropy alloy coating on TC4 titanium alloy and investigates the influence of powder layer thickness and process parameters on stress field through finite element modeling. The study also examines the effect of stress on cracks and evaluates the factors affecting crack rate. Empirical-statistical correlations between key processing parameters and crack rate are proposed. The results provide valuable insights into crack control and properties improvement of high entropy alloy coatings in laser cladding.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Materials Science, Multidisciplinary
Runqi Zhang, Qinyang Zhao, Yongqing Zhao, Dizi Guo, Yu Du
Summary: This paper reviews the dislocation slip behavior of alpha phase in alpha, near alpha and alpha + beta titanium alloys dominated by alpha-Ti deformation under quasi-static loading, and discusses its relation with slip transfer, slip blocking, twinning and crack initiation. The slip behavior in Ti-alloys is analyzed in detail from the aspects of critical resolved shear stress (CRSS), grain orientation distribution and geometric compatibility factor m '. The interaction of slip behavior and interfaces is clarified systematically.
Article
Nanoscience & Nanotechnology
Jie Zhang, Xiaoyang Chen, MingJian Ding, Jiaqiang Chen, Ping Yu
Summary: This study enhances the compositional inhomogeneity of relaxor ferroelectric thin films to improve their dielectric temperature stability. The prepared films exhibit a relatively high dielectric constant and a very low variation ratio of dielectric constant over a wide temperature range.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xiaoyu Chen, Ranran Zhang, Hao Zou, Ling Li, Qiancheng Zhu, Wenming Zhang
Summary: Polyaniline-manganese dioxide composites exhibit high conductivity, long discharge platform, and stable circulation, and the specific capacity is increased by providing additional H+ ions to participate in the reaction.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xutao Huang, Yinping Chen, Jianjun Wang, Gang Lu, Wenxin Wang, Zan Yao, Sixin Zhao, Yujie Liu, Qian Li
Summary: This study aims to establish a novel approach to better understand and predict the behavior of materials with multi-scale lamellar microstructures. High-resolution reconstruction and collaborative characterization methods are used to accurately represent the microstructure. The mechanical properties of pearlite are investigated using crystal plasticity simulation and in-situ scanning electron microscopy tensile testing. The results validate the reliability of the novel strategy.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Cheng Chen, Fanchao Meng, Jun Song
Summary: This study systematically investigated the unfaulting mechanism of single-layer interstitial dislocation loops in irradiated L12-Ni3Al. The unfaulting routes of the loops were uncovered and the symmetry breaking during the unfaulting processes was further elucidated. A continuum model was formulated to analyze the energetics of the loops and predict the unfaulting threshold.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Darshan Bamney, Laurent Capolungo
Summary: This work investigates the formation of adjoining twin pairs (ATPs) at grain boundaries (GBs) in hexagonal close-packed (hcp) metals, focusing on the co-nucleation (CN) of pairs of deformation twins. A continuum defect mechanics model is proposed to study the energetic feasibility of CN of ATPs resulting from GB dislocation dissociation. The model reveals that CN is preferred over the nucleation of a single twin variant for low misorientation angle GBs. Further analysis considering GB character and twin system alignment suggests that CN events could be responsible for ATP formation even at low m' values.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Bing Han, Zhengqian Fu, Guoxiang Zhao, Xuefeng Chen, Genshui Wang, Fangfang Xu
Summary: This study investigates the behavior of electric-field induced antiferroelectric to ferroelectric (AFE-FE) phase transition and reveals the evolution of atomic displacement ordering as the cause for the transition behavior changing from sharp to diffuse. The novel semi-ordered configuration results from the competing interaction between long-range displacement modulation and compositional inhomogeneity, which leads to a diffuse AFE-FE transition while maintaining the switching field.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Akib Jabed, Golden Kumar
Summary: This study demonstrates that cryogenic rejuvenation promotes homogeneous-like flow and increases ductility in metallic glass samples. Conversely, annealing has the opposite effect, resulting in a smoother fracture surface.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xin Ji, Yan Chong, Satoshi Emura, Koichi Tsuchiya
Summary: A heterogeneous microstructure in Ti-15Mo-3Al alloy with heterogeneous distributions of Mo element and omega(iso) precipitates has achieved a four-fold increase in tensile ductility without a loss of tensile strength, by blocking the propagation of dislocation channels and preventing the formation of micro-cracks.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Amit Samanta, Prasanna Balaprakash, Sylvie Aubry, Brian K. Lin
Summary: This study proposes a combined large-scale first principles approach with machine learning and materials informatics to quickly explore the chemistry-composition space of advanced high strength steels (AHSS). The distribution of aluminum and manganese atoms in iron is systematically explored using first principles calculations to investigate low stacking fault energy configurations. The use of an automated machine learning tool, DeepHyper, speeds up the computational process. The study provides insights into the distribution of aluminum and manganese atoms in systems containing stacking faults and their effects on the equilibrium distribution.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Guowei Zhou, Yuanzhe Hu, Zizheng Cao, Myoung Gyu Lee, Dayong Li
Summary: In this work, a physics-constrained neural network is used to predict grain-level responses in FCC material by incorporating crystal plasticity theory. The key feature, shear strain rate of slip system, is identified based on crystal plasticity and incorporated into the loss function as physical constitutive equations. The introduction of physics constraints accelerates the convergence of the neural network model and improves prediction accuracy, especially for small-scale datasets. Transfer learning is performed to capture complex in-plane deformation of crystals with any initial orientations, including cyclic loading and arbitrary non-monotonic loading.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Pengfei Yang, Qichang Li, Zhongying Wang, Yuxiao Gao, Wei Jin, Weiping Xiao, Lei Wang, Fusheng Liu, Zexing Wu
Summary: In this study, the HER performance of Ru-based catalysts is significantly improved through the dual-doping strategy. The obtained catalyst exhibits excellent performance in alkaline freshwater and alkaline seawater, and can be stably operated in a self-assembled overall water splitting electrolyzer.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ilias Bikmukhametov, Garritt J. Tucker, Gregory B. Thompson
Summary: Depositing a Ni-1at. % P film can facilitate the formation of multiple quintuple twin junctions, resulting in a five-fold twin structure and a pentagonal pyramid surface topology. The ability to control material structures offers opportunities for creating novel surface topologies, which can be used as arrays of field emitters or textured surfaces.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Zening Yang, Weiwei Sun, Zhengyu Sun, Mutian Zhang, Jin Yu, Yubin Wen
Summary: Multicomponent oxides (MCOs) have wide applications and accurately predicting their thermal expansion remains challenging. This study introduces an innovative attention-based deep learning model, which achieves improved performance by using two self-attention modules and demonstrates adaptability and interpretability.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ze Liu, Cai Chen, Yuanxun Zhou, Lanting Zhang, Hong Wang
Summary: This study attempts to address the gap in cooling rates between thin film deposition and bulk metallic glass (BMG) casting by correlating the glass-forming range (GFR) determined from combinatorial materials chips (CMCs) with the glass-forming ability (GFA) of BMG. The results show that the full-width at half maximum (FWHM) of the first sharp diffraction peak (FSDP) is a good indicator of BMG GFA, and strong positive correlations between FWHM and the critical casting diameter (Dmax) are observed in various BMG systems. Furthermore, the Pearson correlation coefficients suggest possible similarities in the GFA natures of certain BMG pairs.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Mike Schneider, Jean-Philippe Couzinie, Amin Shalabi, Farhad Ibrahimkhel, Alberto Ferrari, Fritz Koermann, Guillaume Laplanche
Summary: This work aims to predict the microstructure of recrystallized medium and high-entropy alloys, particularly the density and thickness of annealing twins. Through experiments and simulations, a database is provided for twin boundary engineering in alloy development. The results also support existing theories and empirical relationships.
SCRIPTA MATERIALIA
(2024)