Article
Materials Science, Multidisciplinary
Guangwen Zhou, Kinga A. Unocic, Chongmin Wang, Zhiwei Shan, Sarah J. Haigh, Judith C. Yang
Summary: Oxidation and corrosion are the main causes of degradation and failure in metallic materials. Recent advances in environmental transmission electron microscopy have allowed for better understanding of the microscopic mechanisms behind the oxidation and corrosion behavior. This has led to insights into processes such as active sites, surface restructuring, oxide/metal interface dynamics, and microstructure and phase evolution, leading to potential developments in high-temperature oxidation and corrosion.
Article
Materials Science, Multidisciplinary
Christian Wagner, Guillaume Laplanche
Summary: The tensile properties and deformation mechanisms of single-phase face-centered cubic (FCC) CrxMn20Fe20Co20Ni40-x (0 <= x <= 26 at.%) high-entropy alloys (HEAs) were studied at 293 and 77 K. The stacking fault energy (SFE) of these alloys decreases with increasing Cr/Ni ratio, while other characteristics remain constant. The strength-ductility combination increases with decreasing SFE at 77 K, due to the occurrence of deformation twinning. Overall, the SFE plays a crucial role in determining the tensile behavior and deformation mechanisms of FCC HEAs.
Article
Materials Science, Multidisciplinary
Yujiao Li, Shoji Goto, Aleksander Kostka, Michael Herbig
Summary: The strength of pearlitic wires can be increased to a world record level of 7 GPa through cold-drawing. Using nano-beam diffraction, the microstructure of the wires was directly probed, revealing the significance of high-angle grain boundaries and geometrically necessary dislocations in the strengthening mechanism.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Jin-Kyung Kim
Summary: Three deformation mechanisms of TWIP steels were observed by in-situ TEM mechanical testing: formation of deformation twins from grain boundaries, interference of growth of deformation twins by stacking faults, and motion of extended dislocations contributing to plasticity.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Xianbing Zhang, Weilin Wang, Jialin Wu, Shubin Wang, Jian Sun, Jing Yang Chung, Stephen J. Pennycook
Summary: This study designs a Ti48.9Zr32.0Nb12.6Ta6.5 MEA exhibiting {112}<111>(beta) twins at room temperature. The solution-treated (ST) samples show homogeneous chemical composition, good tensile properties, and no athermal phase. Microscopy reveals the interaction between twins and dislocations in the deformation of MEAs, contributing to work hardening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Jin-Seob Kim, Jin-Kyung Kim
Summary: This study investigates the effect of initial microstructures on deformation mechanisms, damage resistance, and mechanical properties of the Fe50Mn30Co10Cr10 high entropy alloy. The results show that the material annealed at 600 degrees C has higher strength and good ductility, with a strain hardening rate affected by the simultaneous deformation accommodation from the FCC/HCP dual phase. The different microstructures significantly influence the deformation and damage mechanisms of the material, as well as the role of grain size and phase transformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Shuo Weng, Yuhui Huang, Mingliang Zhu, Fuzhen Xuan
Summary: This study investigated the microstructural evolution under low-cycle fatigue in base metal (BM) and weld metal (WM) of NiCrMoV steel welded joints through miniature tensile tests and microstructural observations. Results showed that the yield strength and ultimate tensile strength of both BM and WM decreased after low-cycle fatigue tests, attributed to reduction of dislocation density and formation of low-energy structures. However, the microstructural evolution mechanisms in BM and WM under the same cyclic loadings were different.
Article
Nanoscience & Nanotechnology
Jin-Sung Hong, Young-Kook Lee
Summary: The mechanism of dislocation multiplication during thermally-induced gamma austenite <-> e martensite transformation in the Fe-17Mn alloy was investigated using an in-situ transmission electron microscope. Dislocations were introduced in gamma at grain boundaries and inside the grains during thermally - induced gamma <-> e transformations. These dislocations played different roles, including constituting e martensite and returning to grain boundaries during e -> gamma reverse transformation, as well as being introduced by plastic deformation during gamma <-> e transformations.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Mechanical
Yukichika Hashizume, Masahiro Inomoto, Norihiko L. Okamoto, Haruyuki Inui
Summary: The plastic deformation behavior of single crystals of delta(1p) and delta(1k) phase compounds in the Fe-Zn system, which are major constituent phases in galvannealed (GA) steels, was investigated by micropillar compression tests. Different slip systems were observed in the delta(1p) and delta(1k) phase compounds, with strain bursts and instantaneous 'slip plane failure' occurring. The critical resolved shear stress (CRSS) for basal and prism slip showed inverse power-law scaling against specimen size.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Materials Science, Ceramics
Ryo Nakamura, Hiroshi Masuda, Hidehiro Yoshida
Summary: This study investigates the local mechanical responses near single grain boundaries of oxide ceramics through nanoindentation. Contrary to traditional strengthening theories, the study found negligible variations in hardness among grain interiors, grain boundary vicinities, and grain boundaries. However, transmission electron microscopy observation revealed the presence of dislocation pileups at grain boundaries. Therefore, single grain boundaries make limited contributions to the mechanical properties of oxide ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Mechanical
Jin-Kyung Kim, Ji Hoon Kim, Hyojin Park, Jin-Seob Kim, Guanghui Yang, Rosa Kim, Taejin Song, Dong-Woo Suh, Jongryoul Kim
Summary: An in-depth characterization of deformation defects in the FCC Fe40Mn40Co10Cr10 high entropy alloy at room temperature and subzero temperature reveals similar deformation mechanisms and dislocation structures at both temperatures, with higher strain hardening rate observed at subzero temperature.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Xinran Zhou, Xinyi Wang, Lauren Fey, Sicong He, Irene Beyerlein, Penghui Cao, Jaime Marian
Summary: The mechanical response of complex concentrated alloys deviates from that of pure metals and dilute alloys due to the introduction of chemical concentration dimension. Compositional fluctuations constantly alter the energy landscape over which dislocations move, leading to the appearance of defects and fundamentally changing the plastic deformation of CCAs. This article reviews recent advances in modeling dislocation glide processes in CCAs and discusses pathways to develop comprehensive simulation methodologies for improved design of CCAs with superior mechanical response.
Article
Materials Science, Multidisciplinary
Yan Liu, Jinshan Li, Bin Tang, Lin Song, William Yi Wang, Dong Liu, Rui Yang, Hongchao Kou
Summary: The decomposition mechanism of (alpha(2) /gamma) lamellae was investigated using transmission electron microscopy (TEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) techniques. The results revealed the facilitated alpha(2)->ss phase transformation and the formation of ellipsoidal omega(o) particles. The mechanism of the lath-shaped omega(o) phase was attributed to both element segregation and strain accommodation caused by the ss o precipitate in alpha(2) lamellae. These findings provide insights into the decomposition mechanism of (alpha(2)/gamma) lamellae and have implications for controlling microstructures and improving the performance of ss-solidified gamma-TiAl alloys.
Article
Environmental Sciences
Chonghao Jia, Jialin Chi, Wenjun Zhang
Summary: Phosphorus, an important element for crops, can cause environmental problems when lost into water systems. This study evaluated the adsorption ability and molecular mechanisms of a synthetic nanosized clay mineral called laponite in recovering phosphorus from wastewater. Results showed that phosphate adsorbs onto the surface and interlayer of laponite via hydrogen bonding, with greater adsorption energies in the interlayer. These findings provide new insights for the recovery of phosphorus using nano-sized clay and have potential applications in environmental engineering for phosphorus pollution control and sustainable utilization of phosphorus sources.
Article
Materials Science, Multidisciplinary
Maxence Buttard, Marti Lopez Freixes, Charles Josserond, Patricia Donnadieu, Bechir Chehab, Jean-Jacques Blandin, Baptiste Gault, Fredric De Geuser, Guilhem Martin
Summary: This study establishes the relationship between microstructure and mechanical properties of a novel Al-4Mn-3Ni-2Cu-1Zr alloy designed for laser powder bed fusion (L-PBF). The study discusses the role of multiple strengthening mechanisms in achieving high strength in the material. The findings provide guidelines for optimizing the mechanical properties and thermal stability of Al-alloys designed for L-PBF.
Article
Nanoscience & Nanotechnology
Antoine Gueydan, Eric Hug
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2018)
Article
Nanoscience & Nanotechnology
B. Flipon, C. Keller, L. Garcia de la Cruz, E. Hug, F. Barbe
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2018)
Article
Materials Science, Multidisciplinary
Florent Picot, Antoine Gueydan, Mayerling Martinez, Florent Moisy, Eric Hug
Article
Materials Science, Multidisciplinary
F. Moisy, A. Gueydan, X. Sauvage, A. Guillet, C. Keller, E. Guilmeau, E. Hug
MATERIALS & DESIGN
(2018)
Article
Materials Science, Multidisciplinary
Eric Hug, Clement Keller
PHILOSOPHICAL MAGAZINE
(2019)
Article
Nanoscience & Nanotechnology
Lucia Garcia de la Cruz, Mayerling Martinez, Clement Keller, Eric Hug
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Materials Science, Multidisciplinary
Lucia Garcia de la Cruz, Bernadette Domenges, Sergiy V. Divinski, Gerhard Wilde, Eric Hug
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2020)
Article
Materials Science, Multidisciplinary
Sibo Yuan, Laurent Duchene, Clement Keller, Eric Hug, Anne-Marie Habraken
MECHANICS OF MATERIALS
(2020)
Article
Chemistry, Physical
Michal Knapek, Peter Minarik, Patrik Dobron, Jana Smilauerova, Mayerling Martinez Celis, Eric Hug, Frantisek Chmelik
Article
Materials Science, Multidisciplinary
Lucia Garcia de la Cruz, Mayerling Martinez Celis, Clement Keller, Eric Hug
Summary: Research shows that with decreasing grain size, the strain hardening capabilities of nanocrystalline materials decrease, while samples in the submicrometric range exhibit the typical three stages of strain hardening, with a shorter second stage and the third stage starting soon after yielding.
Editorial Material
Materials Science, Multidisciplinary
Eric Hug, Guy Dirras
Article
Materials Science, Multidisciplinary
F. Moisy, X. Sauvage, E. Hug
Article
Materials Science, Multidisciplinary
Mayerling Martinez, Eric Hug
Proceedings Paper
Materials Science, Multidisciplinary
Florent Moisy, Antoine Gueydan, Xavier Sauvage, Clement Keller, Alain Guillet, Nga Nguyen, Mayerling Martinez, Eric Hug
THERMEC 2018: 10TH INTERNATIONAL CONFERENCE ON PROCESSING AND MANUFACTURING OF ADVANCED MATERIALS
(2018)
Proceedings Paper
Materials Science, Multidisciplinary
B. Flipon, L. Garcia de la Cruz, E. Hug, C. Keller, F. Barbe
PROCEEDINGS OF THE 20TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING (ESAFORM 2017)
(2017)