Article
Materials Science, Multidisciplinary
Alexandros Banis, Andrea Gomez, Aniruddha Dutta, Ilchat Sabirov, Roumen H. Petrov
Summary: The strengthening via precipitation of nano-sized kappa-carbides leads to exceptional strength-ductility balance in low-density steels. This study investigates the microstructure of a fully austenitic Fe-29Mn-8.7Al-0.9C alloy after different aging treatments. It is found that the mechanical behavior of the material is highly sensitive to the size of kappa-carbides and can be tailored through appropriate aging treatment.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Weifeng Liu, Yifeng Guo, Yanfei Cao, Jianqiang Wang, Zhiyuan Hou, Mingyue Sun, Bin Xu, Dianzhong Li
Summary: The study investigated the transformation of primary MC and M2C carbides in Cr4Mo4V steel during high-temperature treatment. It was found that the V-rich MC carbides have great thermal stability, while the M2C carbides mainly possess rod-like and lamellar morphologies. The transformation mechanisms include disintegrating, coarsening, and unique paths for the precipitation of different carbides. Longer soaking durations can lead to spheroidization and coarsening of MC carbides, along with the dissolution of M6C carbides.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Jiawei Yan, Guisen Liu, Xiaofeng Zhao, Yao Shen
Summary: Homogeneous precipitation of nano-sized Si particles with high density was achieved in Al-1%Si alloy by electric pulses treatment in a liquid nitrogen bath. This was attributed to both the low-temperature environment and the non-thermal effects of EPT.
MATERIALS SCIENCE AND TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Ning Fang, Chunming Zou, Zunjie Wei, Hongwei Wang, Tao Chang, Jiahan Chen
Summary: Al-7Si-3Cu-0.5Ge-0.4Mg alloy solidified under high pressure exhibited higher strength and better ductility, which could be attributed to the beneficial strengthening effects provided by Mg2Si(Ge) particles and the inhibition of crack propagation by nano-sized Al particles in eutectic Si.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Hongmei Jin, Renguo Guan, Di Tie
Summary: The dissolution of precipitates during cold deformation in aged Al-Si-Mg-Cu alloys plays a crucial role in the mechanical and conductive behavior of the alloys. Through nanometer scale observation, this study reveals that the accumulation of dislocations leads to the transformation of precipitates into smaller particles, Guinier-Preston zones, and solute atoms. The increasing number density of fractured precipitates and the cumulative lattice adsorption energy are the main driving forces behind the dissolution process. These findings are essential for improving the thermomechanical treatment technology of such alloys to enhance their mechanical and conductive performance.
Article
Nanoscience & Nanotechnology
Shiwei Pan, Feng Qian, Chunan Li, Zidong Wang, Yanjun Li
Summary: This study investigates the influence of adding Zr to AA3003 alloy on precipitation hardening and heat resistance. By optimizing heat treatment processes, a microstructure with superior dispersoid strengthening, thermal stability, and increased yield strength was achieved. The enhanced precipitation kinetics of Al3Zr in the alloy, attributed to the Si content, contributes to the stable strength during isothermal aging at 400 degrees C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Meishuai Liu, Yudong Zhang, Xinli Wang, Benoit Beausir, Xiang Zhao, Liang Zuo, Claude Esling
Summary: This study thoroughly investigated the formation of two hexagonal structures in Cu-40Zn alloy treated by ECP. The results show that these structures are formed through two-step atomic displacements, and their concomitant formation minimizes lattice distortion.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Rumyana Lazarova, Yana Mourdjeva, Diana Nihtianova, Georgi Stefanov, Veselin Petkov
Summary: Reinforcement of aluminum and aluminum alloys with graphene has been extensively studied in the past decade. In this study, aluminum-graphene-nano-sized Al4C3 composites were produced and investigated. Nano-sized carbides were found at the interface of aluminum-graphene. The formation of a chemical bond between aluminum and graphene during annealing was confirmed.
Article
Materials Science, Multidisciplinary
Xinmei Yang, Huajian Liu, Bingchuan Chen, Min Ge, Yuan Qian, Jianqiang Wang
Summary: This study investigates the corrosion behavior of GH3535 alloy in molten LiF-BeF2 salt. The results indicate that the corrosion is driven by NiF2 in the salt and O-2 leakage. The corrosion is severer in the hot section compared to the cold section. BeCr2O4 is detected on the alloy surface in the cold section but not in the hot section. Reactions between Be and metallic fluorides significantly reduce the impurity concentration in the molten salt, resulting in no obvious corrosion in the GH3535 alloy at different temperatures.
Article
Chemistry, Inorganic & Nuclear
Lejian Zhang, Xinping Wang, Chuan Shi
Summary: A new protocol for the rapid synthesis of ZSM-5 zeolites with a low Si/Al ratio at a low temperature has been proposed in this study. The liquid seed used in the synthesis not only accelerates zeolite crystallization but also enhances the incorporation of Al into the zeolite framework. The synthesized ZSM-5 zeolite exhibited better catalytic performance compared to the conventionally hydrothermally synthesized one.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Nanoscience & Nanotechnology
Raul I. Arriaga-Benitez, Mihriban Pekguleryuz
Summary: The influence of Mn, Cr and Zr on the creep behavior of an Al-Si-Mg-Cu alloy intended for Diesel engine applications was studied. Two alloys, MG1 and MG2-1, were creep tested at 300-350℃ and 28 MPa in the T7 heat-treated and soaked condition. The activation energy for creep was higher in MG2-1 compared to MG1. The creep mechanisms differed between the two alloys, with MG2-1 showing lower creep rates due to thermally activated restoration processes and Zener pinning by αMG2-1-Al(Mn,Cr,Fe)Si.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Huiqin Yin, Yuying Zhou, Qi Liu, Yang Wang, Zhongfeng Tang, Long Yan
Summary: GH3535 exhibits excellent corrosion resistance in NaOH solution, but experiences serious pitting and grain boundary corrosion in HF solution, as well as distinct hole corrosion in H2O2 solution due to carbide depletion. Element depletion, carbide fall-off, and decrease in hardness and Young's modulus were observed in HF and H2O2 solutions for GH3535. NaOH solution, on the other hand, is chemically inert towards GH3535. The corrosion mechanism was explored based on experimental measurements and thermodynamic calculations, providing theoretical guidance and expanding the application of GH3535.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Zhen Fan, Wei-Ren Liu, Lin Sun, Akira Nishio, Robert Szczesny, Yan-Gu Lin, Shigeto Okada, Duncan H. Gregory
Summary: Silicon has potential as a replacement for graphite in lithium-ion batteries to significantly improve performance, but the sustainability depends on the source and manufacturing process. Current silicon industry relies on energy-intensive, environmentally impactful methods. A new method utilizing microwave-induced magnesium plasma can directly convert SiO(2) to Mg2Si within minutes at low power, resulting in nanoporous silicon anodes that outperform graphite. This concept can also be extended to the synthesis of Mg2Si from Si and the reduction of other metal(loid) oxides using their respective magnesium alloys.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Ceramics
Zhihua Tian, Xueqin Xu, Jingwen Tang, Qianqian Zhang, Fushuo Wu, Peigen Zhang, Jian Liu, ZhengMing Sun
Summary: In this study, nano-sized carbides and metal whiskers were efficiently prepared by mechanochemical decomposition of MAX phases, providing a promising alternative route for large-scale synthesis. The method has potential applications in various high technology industries.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Chemistry, Physical
Qiang Ma, Yan Zhao, Zuojun Hu, Jiakang Qu, Zhuqing Zhao, Hongwei Xie, Pengfei Xing, Dihua Wang, Huayi Yin
Summary: A method utilizing magnesium in molten salts to convert industrial bulk ferrosilicon alloy into nano-sized Si/FeSi was reported in this study. The self-driven alloying-electro-chemical dealloying process enabled the extraction and circular use of Si atoms, leading to the preparation of a high-capacity and stable cycling performance nano Si/FeSi@C anode.
MATERIALS TODAY ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Hua Ai, Shulin Liu, Xiang-Xi Ye, Li Jiang, Bo Zhou, Xinmei Yang, Bin Leng, Zhijun Li
Summary: The study found that metallic impurities can accelerate the diffusion of Cr in Ni-26W-6Cr alloy, affecting the corrosion degree of the alloy. Additionally, the presence of Mo impurities in the salts can lead to unexpected depletion of W in the alloy.
Article
Materials Science, Multidisciplinary
Jinhui Fan, Pengfei Li, Jianping Liang, Xiang-Xi Ye, Li Jiang, Kexin Chen, Zhijun Li, Xingtai Zhou
Summary: Through this study, it was found that heat treatment at 870 degrees Celsius during cold working of UNS N10003 alloy can effectively improve ductility, reduce strength, and undergo no significant changes with prolonged time.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Li Jiang, Kai Wang, Bin Leng, Xiang-Xi Ye, Shuang-Jian Chen, Ren-Duo Liu, Jian-Ping Liang, Chao-Wen Li, Zhi-Jun Li
Summary: Te segregation at grain boundaries reduces diffusion barrier and creates nano-voids, leading to intergranular cracking.
Article
Materials Science, Multidisciplinary
Li Jiang, Xiang-Xi Ye, Shuai Yan, Li Li, Jian-Ping Liang, Chao-Wen Li, De-Jun Wang, Zhi-Jun Li
Summary: The composition and structure gradient of vanadium carbide coating on the 3Cr13 steel substrate was investigated, showing a simultaneous decrease of lattice parameter and carbon concentration from the surface to the interface in the coating. The preferred orientations of the coating were confirmed by incorporating enough grains into the X-ray beam detection by tailoring its configuration.
Article
Nanoscience & Nanotechnology
Shulin Liu, Xiang-Xi Ye, Li Jiang, Renduo Liu, Zhenhuan Gao, Xiufang Gong, Zhijun Li, Xingtai Zhou
Summary: In this study, Zr was added to a Ni-26W-6Cr alloy to enhance its intermediate temperature ductility, and the corresponding mechanism was investigated. It was found that the enrichment of Zr at the solid-liquid interface during solidification led to constitutional undercooling and a decrease in interfacial energy, thereby promoting the nucleation of the gamma phase. Additionally, the enrichment of Zr and C increased the number of M6C carbides in the alloys, inhibiting the grain growth of gamma. The refined grains and increased M6C carbides effectively impeded the movement of dislocations during tensile, resulting in improved yield strength and ultimate tensile strength at 650 degrees C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Kun Yu, Xue Tang, Li Jiang, Xiangxi Ye, Changzheng Xu, Zhijun Li
Summary: The study found that delta phase and gamma'' phase in ERNiCrMo-3 deposited metal have certain orientation relationships and semi-coherent interfaces with the matrix, leading to hardening during the initial aging stage. As aging time increases from 10 to 100 hours, gamma'' phase coarsens while needle-like delta phase becomes denser and longer, contributing to continuous hardening.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Jialei Zheng, Shuangjian Chen, Li Jiang, Zhijun Li
Summary: The effect of carbon content on the ductility-dip cracking susceptibility of additive manufactured NiCrFe-7A alloys was investigated. The results showed that higher carbon content improved the resistance to ductility-dip cracking through the precipitation of more carbides at grain boundaries. Furthermore, a higher proportion of twins and recrystallization in the high carbon alloy hindered the propagation of ductility-dip cracking.
Article
Nanoscience & Nanotechnology
Jialei Zheng, Shuangjian Chen, Li Jiang, Xiang-Xi Ye, Changzheng Xu, Zhijun Li
Summary: The effect of carbon content on the microstructure and mechanical properties of ERNiCrFe-7A alloys fabricated through wire arc additive manufacturing was investigated. It was found that the size and amount of carbides increased with the carbon content. The thermal cycles during the additive manufacturing process caused carbon to diffuse to the grain boundaries and form carbides. The precipitate density and residual strain decreased with the distance from the substrate, resulting in lower hardness in the superficial layers. The high carbon content in the additive manufactured alloy improved the ultimate strength but decreased the plasticity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Li Jiang, Lin Shen, Ren-Duo Liu, Chao -Wen Li, Jian-Ping Liang, De -Jun Wang, Zhi-Jun Li
Summary: The crystallography and morphology evolution of MC carbides in Ni-12Mo-7Cr-2 Nb based superalloy were systematically investigated. The study found that after thermal exposure, the MC carbides appeared in the forms of stacking fault precipitates and flake-shaped ones. It was also observed that Mo doping in NbC decreased the chemical interface energy and favored the nucleation process.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Li Jiang, Jia-Jie Zhu, Chao -Wen Li, Jian-Ping Liang, De-Jun Wang, Zhi-Jun Li
Summary: The nucleation, growth, and degeneration behaviors of MC carbides in the Ni-12Mo-7Cr-2Ti-0.06C alloy during thermal exposure at 650°C-850°C have been studied. Two types of MC carbides, stacking-fault-precipitate (SFP) type and flake-like type, have been observed. SFP-type MC carbides show good thermal stability at 650°C but rapid coarsening and degeneration at higher temperatures. The doping of Mo facilitates the nucleation of MC carbides. The evolution mechanisms of MC carbides involve dislocation formation, Ti segregation, and the expansion of stacking faults.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Yan Jin, Li Jiang, Fang Liu, Chang-Zheng Xu, Zhi-Jun Li
Summary: ERNiCr-3 alloy deposited using GT-WAAM process exhibits segregation and microstructural gradient feature, leading to a strength degradation at the top. The presence of fine-grain remelting zones improves the tensile properties perpendicular to the deposited direction. This study provides guidance for optimizing the GT-WAAM process for ERNiCr-3 alloy.
Article
Materials Science, Multidisciplinary
Jia-Jie Zhu, Li Jiang, Li-Hong Zhai, Jian-Ming Zhou, Xiang-Bin Ding, Zhi-Jun Li
Summary: The effects of TiN inclusions on the oxidation behavior of modified stainless steels were systematically investigated. It was found that the oxidation rate of steel with TiN stringers is almost seven times faster than the clean one during the homogenized treatment. The TiN stringers induce spall fracture and facilitate air permeation in the oxidation layers, while the TiN inclusions act as nucleation sites for oxides and promote internal oxidation at the oxidation interface, leading to severe oxidation of modified austenitic stainless steels.
Article
Chemistry, Physical
Li Jiang, Te Lei, Chao-Wen Li, Jian-Ping Liang, De-Jun Wang, Zhi-Jun Li
Summary: The development of structural materials for molten salt reactors (MSRs) is crucial for their performance. This study investigates the effects of Nb addition and W alloying on the microstructural evolution and mechanical properties of Ni-Mo-W-Cr-Nb based superalloys. Results show that the substitution of Mo by W enhances the alloys' strength, but reduces the precipitation-induced strengthening due to fewer secondary carbides. The absence of secondary carbides in high-W alloys is attributed to the presence of undissolved primary MC carbides and low Mo concentration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Xin Fu, Qing-Chun Zhu, Li Jiang, Fang Liu, Zhi-Jun Li
Summary: The influence of Gd content on the solidification behaviors and as-cast microstructures of Ni-Mo-Cr-Gd alloy was systematically studied. The addition of Gd affected the types of eutectic phases formed and mitigated the segregation of alloying elements. The research findings provide valuable insights for the optimization and processing of Ni-Mo-Cr-Gd alloy for use in molten salt reactors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Yang Du, Bai Qin, Hu Yue, Zhang Yong, Li Zhijun, Jiang Li, Xia Shuang, Zhou Bangxin
Summary: GH3535 alloy has been utilized in molten salt reactor as the main structural material due to its impressive high-temperature strength and excellent resistance to corrosion from the molten salts. However, after four years of operation in the reactor experiment, intergranular cracking of the GH3535 alloy was detected, which was caused by the inward diffusion of fission product Te. Grain boundary engineering (GBE) technique has been employed to enhance the grain-boundary-related properties of the alloy, resulting in better cracking resistance.
ACTA METALLURGICA SINICA
(2023)