Article
Materials Science, Multidisciplinary
Yanyun Bai, Tao Guo, Jiawei Wang, Jin Gao, Kewei Gao, Xiaolu Pang
Summary: The study revealed that the fatigue crack initiation mechanisms of coated alloys are stress sensitive, showing unprecedented characteristics. The proposed mechanism will provide theoretical guidance for designing hard coatings and may even improve the fatigue properties of substrates.
Article
Materials Science, Multidisciplinary
Miguel Ruiz de Sotto, Veronique Doquet, Patrice Longere, Jessica Papasidero
Summary: In this study, an extensive experimental campaign and numerical simulations were conducted to investigate the ductile fracture behavior of Ti-6Al-4V titanium alloy. The results showed that ductility of the material exhibited anisotropic characteristics depending on the stress state and strain rate, with different behavior observed in tension and compression. The fracture strain was found to decrease with increasing absolute value of the triaxiality, reaching a maximum close to zero, while no clear correlation with the Lode parameter was identified.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Yuecheng Dong, Shuai Huang, Yuyang Wang, Biao Zhang, I. V. Alexandrov, Hui Chang, Zhenhua Dan, Li Ma, Lian Zhou
Summary: In this study, stress corrosion cracking (SCC) of TC4 ELI alloy in 3.5% NaCl solution was investigated using slow strain rate test (SSRT) with an in-site electrochemical experiment. The results showed that both lamellar microstructure (LM) and equiaxed microstructure (EM) of TC4 ELI alloy exhibited a certain stress corrosion sensitivity at specific strain rates, with higher sensitivity observed in the LM. The higher alpha phase content and presence of triangular grain boundaries in the LM were attributed to the increased stress corrosion sensitivity.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Wei Zhou, Aprilia Aprilia, Chee Kong Mark
Summary: This study investigates surface cracking during bead-on-plate laser welding of AZ91D magnesium alloy, attributing the cracking to solidification cracking under high thermal stresses. The research finds that laser power is a crucial factor impacting the distance of crack propagation.
Article
Chemistry, Multidisciplinary
Jiayu Wu, Zhixing Zhang, Zhenyuan Wu, Desheng Liu, Xingxing Yang, Yixian Wang, Xin Jia, Xin Xu, Pan Jiang, Xiaolong Wang
Summary: This study develops a printable and tough supramolecular polymer hydrogel through hydrogen bond engineering, utilizing strain-induced microphase separation behavior and dynamic shape memory. Hydrogel stents manufactured by 3D printing show good biocompatibility and drug elution, indicating potential biomedical applications for these high-toughness hydrogels.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yutie Gong, Zhenzhen Li, Hairong Li, Wenqi Wu, Weijie Zhou, Jiayu Zhao, Chengen He, Ming Jiang
Summary: This study proposes a new strategy for designing thermo-responsive dielectric switching materials that integrate promising dielectric properties, outstanding mechanical properties, and high cycle stability. The design of an ion gel based on a dual dielectric switching mechanism achieves unique reversible dielectric bistability, high switching ratio, wide thermal hysteresis loop, and tunable transition behavior. The all-in-one design enhances adaptability, durability, and the lifetime of the dielectric switching gels.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Mechanical
A. Dalmau, A. Igual Munoz, S. Mischler
Summary: The tribocorrosion mechanisms of a Ti-Nb-Zr-Ta alloy rubbing against a zirconia ball in a Phosphate Buffered Solution (PBS) were studied. Tribocorrosion tests were carried out with varying normal loads and anodic potentials. Transients consisting of current increase and a decrease in the COF were observed, along with subsurface cracking and third body build up. These phenomena could be described by an initial sliding tribocorrosion followed by the build-up of a protective third body, and subsurface cracking due to strain accumulation.
Article
Polymer Science
Hui Niu, Shengtao Wang, Yilin Shen, Shouqing Liu, Shuyang Jiang, Tao Qin, Taohong Li
Summary: In this study, two novel polymers were synthesized through a facile strategy involving polymerization of melamine and M-xylylenediamine, as well as copolymerization of melamine-urea. These polymers exhibit outstanding structural adhesion properties at a wide temperature range from 196 to 200 degrees Celsius, thanks to their well-balanced rigid-flexible structures.
Article
Chemistry, Physical
Yinhui Wang, Zhiqiang Liang, Wenxiang Zhao, Xibin Wang, Hao Wang
Summary: This work investigates the anisotropic cutting mechanisms on the surface quality of sapphire in ultra-precision machining. The results show that the ductile-to-brittle transition (DBT) depth is influenced by the machining direction. The evaluation of DBT depths, subsurface damage, and cutting forces is essential for optimizing the precision machining of sapphire.
APPLIED SURFACE SCIENCE
(2023)
Article
Mechanics
Yue Wang, He Ma, Yanhua Zhang
Summary: The effect of notch depth on the fracture behavior of 1.8 mm thick TC4 titanium alloy sheets was investigated using tensile tests and digital image correlation method. Ductile-brittle transition was observed as the notch depths increased. Ductile fracture occurred for notched samples with a notch depth of 0.5-1.5 mm, while brittle fracture occurred for notch depths of 3.0-5.0 mm. Samples with a notch depth of 2.0-2.5 mm exhibited a transition from ductile to brittle fracture. Fracture energy γf was found to characterize the ductile-brittle transition of notched TC4 titanium alloy sheets.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Civil
Yue Wang, Haitao Zhao, He Ma, Yanhua Zhang
Summary: This study investigated the fracture characteristics of TC4 titanium alloy sheets with different thicknesses through single-edge crack tensile tests. It was found that a ductile-brittle transition behavior occurred in the thickness range of 0.6-1.8 mm. The size of the plastic zone and cracking parameters can be used to qualitatively evaluate the toughness and brittleness of the material.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Xiaohu Hao, Honggang Dong, Fengyun Yu, Peng Li, Zhonglin Yang
Summary: An innovative weld with high tensile strength was fabricated for gas tungsten arc welding of TC4 titanium alloy and 304 stainless steel with Cu foil as interlayer and Ni-based alloy as filler metal simultaneously. The newly designed weld effectively inhibited transverse cracking of the joint and reduced the dissolution of titanium alloy at the interface. The tensile strength of the joint reached 485 MPa, fracturing at the Ti-side interface consisting of beta-Ti and Ti2Ni phases.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Dongzhou Jia, Yanbin Zhang, Changhe Li, Min Yang, Teng Gao, Zafar Said, Shubham Sharma
Summary: The effects of lecithin on the electrophysiological properties of biolubricant were investigated, and the influence of lecithin mixing ratio on grinding performance was discussed. The experimental results demonstrate that lecithin can improve the conductivity, viscosity, and surface tension of biolubricant, leading to enhanced grinding performance.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Manufacturing
M. C. Zang, H. Z. Niu, S. Liu, R. Q. Guo, D. L. Zhang
Summary: For the first time, electron beam powder bed fusion (EB-PBF) is confirmed to be feasible for manufacturing high-performance titanium alloy components for ultra-low temperature application. Cryogenic strength and ductility of the EB-PBF-built trace yttrium modified Ti- 3A1- 3Mo- 3Zr alloy were found to be closely related to lamellar structures. The samples with coarse columnar lamellar colonies achieved a breakthrough in cryogenic ductility, reaching elongation to fracture (El) of up to 20.0% at 20 K and 29.0% at 77 K without sacrificing strength significantly. However, the interwoven structures of fine a-Ti laths hindered dislocation slide/transferring and twins growing up, resulting in superhigh ultimate tensile strength (UTS) but moderate El.
ADDITIVE MANUFACTURING
(2023)
Article
Green & Sustainable Science & Technology
Jianming Li, Yongqing Wang, Kuo Liu, Di Zhao, Shaowei Jiang, Yuebing Yang, Qingbo Yu
Summary: This paper studies the chip formation mechanism of cryogenic machining and establishes a specific cutting energy model based on liquid nitrogen orthogonal milling experiments. The results show that in cryogenic machining, adiabatic shear dominates the formation of serrated chips when the cutting speed is less than 200 m/min, and the cutting energy consumption is higher than that of dry cutting. As the cutting speed exceeds 200 m/min, adiabatic shear and periodic fracture together dominate the formation of serrated chips, and the energy consumption of cutting is significantly reduced. This research provides reference and guidance for the sustainable development of cryogenic machining.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Nanoscience & Nanotechnology
F. Sun, J. Y. Zhang, M. Marteleur, C. Brozek, E. F. Rauch, M. Veron, P. Vermaut, P. J. Jacques, F. Prima
SCRIPTA MATERIALIA
(2015)
Article
Microscopy
Jon Alkorta, Matthieu Marteleur, Pascal J. Jacques
Article
Mechanics
Matthieu Marteleur, Julien Leclerc, Marie-Stephane Colla, Van-Dung Nguyen, Ludovic Noels, Thomas Pardoen
Summary: The study investigates the ductile fracture behavior of high strength steel using experimental results and models to build a predictive framework. The research reveals that the alignment of long inclusion axes leads to significant failure anisotropy, despite isotropic plastic behavior.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Julie Gheysen, Matthieu Marteleur, Camille van der Rest, Aude Simar
Summary: An innovative methodology has successfully optimized the parameters of laser-melted metal AlSi12 using fewer samples and experiments, resulting in better mechanical properties.
MATERIALS & DESIGN
(2021)
Article
Engineering, Manufacturing
O. Poncelet, M. Marteleur, C. van der Rest, O. Rigo, J. Adrien, S. Dancette, Pj Jacques, A. Simar
Summary: This study examines the impact of process parameters in L-PBF technique on the properties of AlSi10Mg, showing that TED and offset play a significant role in vertical roughness. TED reduces roughness mainly due to a geometrical effect, while increasing offset can also help reduce roughness.
ADDITIVE MANUFACTURING
(2021)
Article
Mechanics
Julien Leclerc, Matthieu Marteleur, Marie-Stephane Colla, Thomas Pardoen, Ludovic Noels, Van-Dung Nguyen
Summary: The study on ductile fracture behavior of high strength steel utilized a micromechanics-based approach to propose a numerical model based on the Gurson-Tvergaard-Needleman model. By identifying parameters through inverse modeling, the model was shown to adequately predict the effects of stress triaxiality and Lode parameter on fracture strain and anisotropy. The damage-to-crack transition framework successfully reproduced experimental observations of cup-cone and slant fracture paths.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
L. Choisez, A. Elmahdy, P. Verleysen, P. J. Jacques
Summary: Enhanced mechanical properties have been observed in recently developed TRIP-TWIP beta-metastable Ti alloys, with improved strain hardening capacity and uniform strain. This study investigates the fracture properties of Ti-12wt.% Mo tested under quasi-static conditions at room temperature, revealing the influence of tensile specimen geometry on the fracture mechanism. The evolution of temperature and crack propagation speed provides insights into the specific fracture patterns and characteristics.
Article
Materials Science, Multidisciplinary
L. Choisez, G. Roy, P. J. Jacques
Summary: The study observed adiabatic shear banding at very large speed during the unstable fracture of Ti-12 wt% Mo alloy under quasi-static loading. Various models were compared to analyze the phenomenon, highlighting the importance of shear band thickness and shearing time.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Laurine Choisez, Niek E. van Rooij, Conrad J. M. Hessels, Alisson K. da Silva, Isnaldi R. Souza Filho, Yan Ma, Philip de Goey, Hauke Springer, Dierk Raabe
Summary: For the successful transition to sustainable carbon-free energy carriers, a safe and high-density energy storage technology is needed. This study investigates the combustion of iron powders and its morphological and microstructural evolution. Iron powder combustion resulted in spherical hollow particles with a complex microstructure, and partial evaporation was observed. The cracking at the end of the combustion process led to mostly open porosity, which is favorable for subsequent reduction.
Article
Materials Science, Multidisciplinary
L. Choisez, L. Ding, M. Marteleur, A. Kashiwar, H. Idrissi, P. J. Jacques
Summary: This study reports the occurrence of dynamic recrystallization within adiabatic shear bands formed during the fracture of TRIP-TWIP beta-metastable Ti-12Mo alloy. Surprisingly, the formation of adiabatic shear bands and dynamic recrystallization was observed under quasi-static loading conditions at room temperature. The microstructural evolution during the fracture process was investigated using Focused Ion Beam (FIB), Transmission Electron Microscopy (TEM), and Automated Crystal Orientation mapping (ACOM-TEM), revealing complex transformations involving severe plastic deformation, crystalline rotation, and local precipitation of the omega at h phase.
Article
Materials Science, Multidisciplinary
M. Marteleur, H. Idrissi, B. Amin-Ahmadi, F. Prima, D. Schryvers, P. J. Jacques
Proceedings Paper
Materials Science, Multidisciplinary
F. Sun, J. Y. Zhang, C. Brozek, M. Marteleur, M. Veron, E. Rauch, T. Gloriant, P. Vermaut, C. Curfs, P. J. Jacques, F. Prima
MATERIALS TODAY-PROCEEDINGS
(2015)