Plus complexe que la simple fissuration par corrosion, la fragilisation par métal liquide (LME) est un phénomène par lequel certains métaux ductiles deviennent fragiles lorsqu'ils sont exposés à des métaux liquides spécifiques, ce qui entraîne une rupture soudaine et catastrophique sous l'effet de la contrainte. Ce phénomène se produit par la pénétration rapide du métal liquide le long des joints de grains du métal solide, ce qui affaiblit les liaisons interatomiques et facilite l'apparition et la propagation des fissures. La LME dépend fortement de la combinaison des métaux solides et liquides impliqués, ainsi que de facteurs tels que la température et la contrainte appliquée. Parmi les exemples industriels courants, on peut citer la fragilisation de l'acier par le zinc ou l'aluminium liquide au cours des processus de galvanisation à chaud.
Voici notre dernière sélection de pays du monde entier publications and patents in english on Liquid Metal Embrittlement (LME), between many scientific online journals, classified and focused on liquid metal embrittlement, metal embrittlement, liquid metal, Ga-Al, liquid metal induced embrittlement, induced embrittlement, ductility loss, ductile-to-brittle, grain boundaries, mercury embrittlement, gallium embrittlement, Al-Ga, liquid gallium and aluminium gallium.
A Mechanism of Argon Arc Remelting of LPBF 18Ni300 Steel Surfaces
Published on 2025-04-18 by Xiaoping Zeng, Yehui Sun, Hong Zhang, Zhi Jia, Quan Kang @MDPI
Abstract: This study aims to reduce pores, cracks, and other defects on the surface of laser powder bed fusion (LPBF)-fabricated 18Ni300 steel and improve its surface quality. Remelting was carried out on the surface with an argon arc as the heat source. Then, the surface layer was characterized using SEM, EDS, XRD, EBSD, and hardness testing. The results showed the following: When the pulse current I increased from 16 A to 20 A, the surface hardness of LPBF 18Ni300 increased due to a decrease in defects [...]
Our summary: This study investigates the mechanism of argon arc remelting on the surfaces of LPBF 18Ni300 steel to improve surface quality and hardness. Results show that increasing pulse current enhances surface hardness by reducing defects and increasing martensite phase, while excessive current can introduce new defects and decrease hardness. Factors affecting hardness include pore weakening, phase transformation strengthening, grain refinement strengthening, and texture strengthening.
argon arc remelting, LPBF 18Ni300 steel, surface quality, hardness testing
Publication
Microstructure Evolution During Preparation of Semi-Solid Billet for 7075 Aluminum Alloy by EASSIT Process
Published on 2025-04-17 by Yanghu Hu, Ming Chang, Shuqin Fan, Boyang Liu, Yongfei Wang, Shuangjiang Li, Chao Zhang, Peng Zhang, Shengdun Zhao @MDPI
Abstract: The 7075 aluminum alloy semi-solid billet is prepared using the extrusion alloy semi-solid isothermal treatment (EASSIT) process. These findings indicate that as the isothermal time increases, there is a noticeable increase in both the average grain size (AGS) and shape factor (SF). The relationship between the AGS, SF, and isothermal temperature is complex due to the influence of grain refinement mechanisms. The HV0.2 of isothermal samples decreased with the increase in isothermal temperature, [...]
Our summary: The study investigates the microstructure evolution of 7075 aluminum alloy semi-solid billet prepared by the EASSIT process. Increasing isothermal time leads to larger average grain size and shape factor. Cu and Si segregation affects the coarsening behavior at high temperatures.
Microstructure Evolution, Semi-Solid Billet, EASSIT Process, Grain Refinement
Publication
Microstructure and Thermal Analysis Kinetics of Y2Hf2O7/Y3Al5O12 Composites Prepared by Solution Combustion Synthesis
Published on 2025-04-15 by Rui Li, Shengyue Gu, Yimin Guo, Bei Xue, Qian Zhou, Ruimei Yuan, Longkang Cong, Yaming Zhang @MDPI
Abstract: With the development of high-speed and high-temperature equipment, thermal barrier materials are facing increasingly harsh service environments. The addition of YAG to Y2Hf2O7 has been proposed in order to improve its long-term high-temperature performance. In this work, Y2Hf2O7/Y3Al5O12 composite powders were synthesized by combustion synthesis with urea, glycine, EDTA, citric acid, and glucose as fuels, while hafnium tetrachloride, yttrium nitrate hexahydrate, and aluminum nitrate nonahydrate [...]
Our summary: Y2Hf2O7/Y3Al5O12 composites prepared with various fuels were analyzed for their morphology, phase composition, and thermal behavior. The addition of YAG to Y2Hf2O7 improved its high-temperature performance. Urea was found to be the most suitable fuel for the synthesis process, resulting in uniform distribution of grains and lower activation energies.
Microstructure, Thermal Analysis, Kinetics, Solution Combustion Synthesis
Publication
Technology and Electrophysical Properties of PZT-Type Ceramics Doped by Samarium
Published on 2025-04-13 by Dariusz Bochenek, Dagmara Brzezi?ska, Przemys?aw Niemiec, Maciej Zubko, Katarzyna Osi?ska @MDPI
Abstract: In this work, a multicomponent PZT-type material doped with manganese Mn, antimony Sb, samarium Sm, and tungsten W was fabricated using classical powder technology. Sintering of the ceramic samples was performed by the free sintering method (pressureless sintering). The influence of samarium on the properties of PZT was analyzed using a variable amount of samarium Sm3+ (from 0.8 to 1.2 wt.%) and tungsten W6+ (from 1.4 to 1.2 wt.%) admixture compared to the Pb(Zr0.49Ti0.51)0.963Mn0.021Sb0.016O3 +[...]
Our summary: Multicomponent PZT-type material doped with samarium, manganese, antimony, and tungsten was fabricated using classical powder technology. Sintering done by pressureless method. Influence of samarium on properties analyzed with XRD, FE-SEM, P-E hysteresis, and dielectric studies showing high permittivity and low dielectric loss factor values. Homogeneous structure achieved with equal content of samarium and tungsten admixtures.
PZT-Type Ceramics, Samarium Doping, Electrophysical Properties, Powder Technology
Publication
Impact of Heat Treatment Parameters on the Plastic Properties of 6061 Aluminum Alloy
Published on 2025-04-09 by Xiangdong Jia, Zhenyu Fan, Zhan Luo, Gang Hu, Hongyao Zhang @MDPI
Abstract: The 6061 aluminum alloy is extensively utilized in the production of aircraft components, valve parts, and maritime equipment, owing to its exceptional corrosion resistance, weldability, machinability, and anodic oxidation performance. This study investigates the effects of different heat treatment parameters on the mechanical properties of 6061 aluminum alloy. A series of orthogonal experiments were conducted, including quasi-static tensile tests using a QJBV212F-300KN universal testing machine[...]
Our summary: This study explores the impact of different heat treatment parameters on the plastic properties of 6061 aluminum alloy through orthogonal experiments and microstructural characterization. Results show improved plasticity within a specific temperature range, but significant grain coarsening at higher temperatures leading to increased brittleness. The elongation of the alloy also varies with aging time, and a constitutive model was developed to predict flow stress accurately under different heat treatment conditions.
Heat Treatment Parameters, Plastic Properties, 6061 Aluminum Alloy, Mechanical Properties
Publication
Influence of Hot Deformation Temperature on Grain Size and γ′ Phase in U720Li Alloy After Sub-Solvus Heat Treatment
Published on 2025-04-04 by Junyi Cheng, Jiangying Xiong, Anping Long, Lei Xiao, Xiangdong Ma, Ganjiang Feng, Jianzheng Guo @MDPI
Abstract: Precise control of forging and heat treatment parameters is essential to achieve microstructural homogeneity in turbine disks, ensuring optimal mechanical performance for aerospace applications. This study examines the influence of the hot deformation temperatures on the grain size and γ′ phase characteristics of U720Li alloy following subsequent heat treatments. Samples extracted from a hot-extruded U720Li billet were subjected to isothermal compression within the te[...]
Our summary: Influence of hot deformation temperature on grain size and gamma prime phase in U720Li alloy after sub-solvus heat treatment. Precise control of forging and heat treatment parameters is essential for microstructural homogeneity in turbine disks, ensuring optimal mechanical performance for aerospace applications. Study examines how hot deformation temperatures affect grain size and gamma prime phase characteristics of U720Li alloy after heat treatments.
deformation temperature, grain size, gamma prime phase, heat treatment
Publication
Process method for producing x80 pipeline steel having extreme specifications in high water temperature seasons
Patent published on the 2025-04-03 in WO under Ref WO2025066736 by BENGANG STEEL PLATES CO LTD [CN] (Wu Gang [cn], Liu Zhipu [cn], Han Yu [cn], Gong Zhen [cn], Zhou Yanfeng [cn], Ma Siyuan [cn])
Abstract: A process method for producing X80 pipeline steel having extreme specifications in high water temperature seasons. Ideal mechanical properties and microstructure are obtained by means of controlling composition, heating, rolling, cooling, laminar cooling water temperature and other processes and technologies. The metallographic structure of the steel is composed of acicular ferrite + granular bainite + M-A; in particular, the content of the M-A component is controlled to be 4-8%, and the average[...]
Our summary: Ideal process method for producing X80 pipeline steel with extreme specifications in high water temperature seasons, achieving ideal mechanical properties and microstructure, meeting standard requirements for pipeline projects prone to large plastic deformation.
pipeline steel, process method, high water temperature, mechanical properties
Patent
Conductive and adhesive liquid metal copper paste
Patent published on the 2025-03-06 in WO under Ref WO2025049954 by VIRGINIA TECH INTELLECTUAL PROPERTIES INC [US] (Bartlett Michael D [us], Anand Tutika Ravi Tej [us])
Abstract: Embodiments of a liquid metal paste for coupling conductive components of circuits formed in or on rigid, flexible, and stretchable substrates are described. In one example, a liquid metal paste includes liquid metal. The liquid metal paste further includes copper elements mixed with the liquid metal to form a conductive mixture. In another example, the liquid metal paste further includes an elastomer material mixed with the liquid metal to form a conductive and adhesive mixture.[...]
Our summary: Liquid metal copper paste for coupling conductive components in circuits on various substrates, includes copper elements and elastomer material for conductivity and adhesion.
liquid metal, copper paste, conductive components, elastomer material
Patent
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