Article
Nanoscience & Nanotechnology
A. Rapetti, F. Christien, F. Tancret, P. Todeschini, S. Hendili, J. Stodolna
Summary: The sensitivity to ductility dip cracking was significantly different in two high chromium nickel alloys with different sulphur contents. Postmortem analyses revealed no segregation of sulphur at grain boundaries, but grain boundary fracture surfaces are covered with sulphur. It is suggested that sulphur plays a role as a surfactant in dynamic grain boundary embrittlement, facilitating crack opening.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Doruk Aksoy, Remi Dingreville, Douglas E. Spearot
Summary: Grain boundaries in metallic materials can have various stable and metastable structures, with properties that can be altered by solute segregation. A new formulation combining embrittling potencies associated with solute segregation with site-occupancy statistics was presented in this work. Molecular statics calculations on a large number of grain boundaries revealed the importance of considering both the energies associated with embrittlement and the probability of occupancy to describe the embrittling nature of a grain boundary.
Article
Materials Science, Multidisciplinary
Han Lin Mai, Xiang-Yuan Cui, Daniel Scheiber, Lorenz Romaner, Simon P. Ringer
Summary: This study investigates the segregation and co-segregation effects of phosphorus (P) and transition metal (TM) elements at grain boundaries (GBs) in steels. The findings reveal that while P alone is unlikely to cause intergranular fracture, its stronger segregation binding compared to TMs can explain its ubiquitous presence at GBs. The repulsive interactions and strong segregation binding of P deplete cohesion-enhancing solutes at general GBs and favor cohesion-lowering P-TM co-segregation combinations. These mechanisms contribute to P-induced temper embrittlement in alloyed steels and have significant implications for GB engineering.
Article
Materials Science, Multidisciplinary
Ge Zhang, Guoqing Chen, Chinnapat Panwisawas, Xinyan Teng, Yaorui Ma, Rong An, Yongxian Huang, Jian Cao, Xuesong Leng
Summary: This study systematically investigates the effect of oxygen segregation on the embrittlement of molybdenum grain boundaries. It is found that oxygen segregation weakens the grain boundary cohesion and increases the intergranular cleavage tendency of molybdenum. However, oxygen segregation does not always trigger grain boundary embrittlement under certain conditions.
Article
Chemistry, Multidisciplinary
Ali Ahmadian, Daniel Scheiber, Xuyang Zhou, Baptiste Gault, Lorenz Romaner, Reza D. Kamachali, Werner Ecker, Gerhard Dehm, Christian H. Liebscher
Summary: The embrittlement of metallic alloys by liquid metals is a serious problem that affects their structural integrity. This study reveals how boron segregation can mitigate the detrimental effects of zinc, a prime embrittler, in a specific type of grain boundary in alpha-Fe (4 at.% Al). Zinc induces nanoscale segregation patterns that result in complex grain boundary states. Ab initio simulations show that boron inhibits zinc segregation and compensates for the loss of grain boundary cohesion caused by zinc. This research sheds new light on how interstitial solutes can modify grain boundaries and suggests their potential use as dopants to prevent material failure.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
M. C. Niu, C. J. Chen, W. Li, K. Yang, J. H. Luan, W. Wang, Z. B. Jiao
Summary: Understanding the solute interaction effects on grain boundary segregation, precipitation, and fracture of Fe-Ni-Ti-(Mo) maraging steels is crucial for the development of improved steel performance. The addition of Mo effectively suppresses intergranular embrittlement by reducing the segregation of Ni and Ti, inhibiting the formation of coarse Ni3Ti precipitates and precipitate-free zones at grain boundaries, and enhancing grain boundary cohesion.
Article
Nanoscience & Nanotechnology
Kazuho Okada, Akinobu Shibata, Taisuke Sasaki, Hisashi Matsumiya, Kazuhiro Hono, Nobuhiro Tsuji
Summary: This study aimed to improve the resistance against hydrogen embrittlement by increasing the concentration of carbon segregated at prior austenite grain boundary (PAGB), XPAGB, in low-carbon martensitic steels. The specimens with and without carbon segregation treatment (Non-seg and Seg specimens, respectively) had similar microstructures, except for higher XPAGB in the Seg specimen. The Seg specimen exhibited higher maximum stress and smaller fraction of intergranular fracture surface under hydrogen-charged conditions, indicating that segregated carbon suppressed hydrogen accumulation and increased cohesive energy of PAGB.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Kazuma Ito, Yuta Tanaka, Kazumasa Tsutsui, Tomohiko Omura
Summary: The development of high-strength steels is essential for achieving a decarbonized society. The addition of molybdenum (Mo) has been proven effective in addressing the problem of hydrogen embrittlement, but its underlying mechanism remains unclear. In this study, a calculation method was developed to evaluate the impact of adding alloying elements on the grain boundary segregation of hydrogen (H) using first-principles calculations. The results showed that a small amount of Mo segregates to α-Fe grain boundaries and reduces the grain boundary H concentration due to repulsive interactions between Mo and H. This information can contribute to the development of high-strength steels with excellent resistance to hydrogen embrittlement.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
R. Chaouadi, J. Van Eyken, R. Gerard, M. Lambrecht, I Uytdenhouwen
Summary: The study focuses on the idea of thermal ageing embrittlement susceptibility of reactor pressure vessel materials, despite the absence of significant thermal ageing reported in available data.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Megan J. McCarthy, Timothy J. Rupert
Summary: This study investigates the migration behavior of a faceted Sigma 11 boundary in Cu doped with Ag atoms, revealing that solute atoms segregate to a facet with more free volume and greatly reduce boundary velocity in one migration direction. However, a directionally-dependent motion mechanism can escape solute pinning and speed up migration in the other direction, uncovering a new mechanism of chemically-induced anisotropy in grain boundary mobility.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
X. H. Chen, X. Q. Zhuang, J. W. Mo, J. Y. He, T. Yang, X. Y. Zhou, W. H. Liu
Summary: The study demonstrates that boron doping can effectively reduce the ductility loss and enhance the resistance to hydrogen embrittlement in CrCoNi medium-entropy alloy, by improving grain-boundary cohesion and reducing hydrogen diffusivity.
MATERIALS RESEARCH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Rei Sato, Kenichi Takai
Summary: Low-temperature thermal desorption spectrometry (L-TDS) was used to quantitatively evaluate the hydrogen desorption peak temperatures (Tp), the hydrogen desorption activation energies (Ea), and the hydrogen occupation ratios (theta) of high-angle grain boundaries and dislocations in iron. The study found that specimens containing dislocations and high-angle grain boundaries displayed two hydrogen desorption peaks, corresponding to dislocations and high-angle grain boundaries, respectively. The Tp, Ea, and theta values were different between dislocations and high-angle grain boundaries.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Jingliang Wang, Masato Enomoto, Chengjia Shang
Summary: First-principles calculations were conducted to investigate the Sigma 5(310) grain boundary in Fe with B, C, and P, revealing the embrittlement caused by P and the de-embrittling effect of B and C. The energetic preference of interstitial B and C over interstitial P was found, with only substitutional P exacerbating grain boundary cohesion. The study demonstrated that the influence of these elements on the grain boundary cohesion is a complex interplay between mechanical and chemical contributions.
Article
Nanoscience & Nanotechnology
Wufeng Dong, Hua Pan, Ming Lei, Kai Ding, Yulai Gao
Summary: The relationship between liquid metal embrittlement (LME) defect and Fe-Zn intermetallic compounds (IMCs) in galvanized high-strength steels during resistance spot welding was systematically investigated. The results showed that LME cracks mainly occurred in the center and shoulders of the weld, and the brittle Fe-Zn IMCs played a critical role in initiating and promoting the formation of LME cracks.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Han Lin Mai, Xiang-Yuan Cui, Daniel Scheiber, Lorenz Romaner, Simon P. Ringer
Summary: In this study, the segregation and accumulation of hydrogen in Ni grain boundaries and their effects on cohesion and tensile mechanical strength were investigated using density functional theory simulations. The results show that the grain boundary character is the principal determinant of the likelihood of hydrogen segregation and accumulation, and hence their vulnerability to hydrogen-enhanced decohesion. This knowledge can be utilized in the design of thermomechanical processes for resistance to hydrogen embrittlement.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Ceramics
Ting Wang, X-L Wang, S-H Song, Qing Ma
CERAMICS INTERNATIONAL
(2020)
Article
Electrochemistry
Jingwei Wang, Guohua Chen, Shenhua Song
ELECTROCHIMICA ACTA
(2020)
Article
Engineering, Electrical & Electronic
Jianghe Liu, Zeba Khanam, Ravi Muchakayala, Shenhua Song
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Nanoscience & Nanotechnology
Yu Guo, Kai Wang, Shenhua Song
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Polymer Science
Jianghe Liu, Sultan Ahmed, Zeba Khanam, Ting Wang, Shenhua Song
Article
Electrochemistry
Zeba Khanam, Jianghe Liu, Shenhua Song
ELECTROCHIMICA ACTA
(2020)
Article
Materials Science, Multidisciplinary
Yu Guo, Yu Zhao, Shenhua Song
Article
Chemistry, Physical
Jianghe Liu, Zeba Khanam, Sultan Ahmed, Hengtai Wang, Ting Wang, Shenhua Song
Summary: A novel gel polymer electrolyte (GPE) membrane based on the PVdF-HFP/EMITf/Al(Tf)(3) system has been developed with high ionic conductivity and wide electrochemical stability window, showing outstanding performance under different temperatures.
JOURNAL OF POWER SOURCES
(2021)
Article
Nanoscience & Nanotechnology
Jianghe Liu, Zeba Khanam, Sultan Ahmed, Ting Wang, Hengtai Wang, Shenhua Song
Summary: The gel electrolyte based on the PVA/Zn/ethylene glycol system shows high ionic conductivity and excellent antifreezing performance. The antifreezing Zn-ion hybrid supercapacitor fabricated with this gel electrolyte exhibits outstanding electrochemical properties and cyclic stability, even under low temperatures, demonstrating its potential for flexible energy storage devices in subzero-temperature environments.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Zeba Khanam, Jianghe Liu, Shenhua Song
Summary: Efficient, facile, and scalable production of graphene dispersions is achieved by exfoliating graphite in an environment-friendly PVA/H2O solvent system. High-quality graphene flakes are obtained with a high concentration through systematic investigation of processing parameters. The PVA-stabilized graphene dispersion shows promising potential for commercial viability in various applications.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Engineering, Mechanical
T. C. Wang, Y. Guo, X. M. Chen, K. Wang, S. H. Song
Summary: In this study, the coarse-grained heat-affected zone (CGHAZ) of P-doped SA508Gr.4N steel was simulated, and the effects of residual stress and P grain-boundary segregation on fracture nature were investigated. It was found that annealing treatment could improve the toughness of the specimen to a certain extent, but the boundary cohesion would decrease. Furthermore, the variation of ageing temperature also affected the fracture properties of the specimen.
ENGINEERING FAILURE ANALYSIS
(2022)
Review
Materials Science, Multidisciplinary
Tingdong Xu, Kai Wang, Shenhua Song
Summary: The measurement uncertainty in tensile testing results from the influence of temperature and strain rate variations on the microstructure at atomic level, leading to changes in mechanical properties. A new technology system proposes using a mechanical property-tensile strain rate curve to evaluate the original mechanical property, with a higher strain rate yielding results closer to the original property. This technology system could potentially revolutionize the conceptual framework and testing technology system of metallic mechanics.
Article
Materials Science, Multidisciplinary
Kai Wang, Yu Guo, Shenhua Song
Summary: The study focuses on investigating the non-hardening embrittlement caused by grain boundary segregation of P in a P-doped SA508-4 N steel through impact testing in conjunction with Auger electron spectroscopy and microstructural characterization. Results show a linear dependence of DBTT on the boundary concentration of P when steel hardness is fixed. A time-temperature embrittlement diagram is developed based on the DBTT-segregation relation, which can be used to predict embrittlement tendency in the steel.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Jianghe Liu, Zijian Ye, Xingcheng Hu, Sultan Ahmed, Shenhua Song
Summary: The scarcity of lithium and its uneven distribution on Earth has posed a challenge in electrochemical energy storage, but replacing lithium with sodium, which is abundant and low-cost, shows promise. By synthesizing Na-ion conducting gel polymer membranes, the electrical and electrochemical properties of membranes can be optimized for potential applications in future sodium-ion energy storage devices.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yu Guo, Yu Zhao, Kai Wang, Shenhua Song
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
