Article
Materials Science, Multidisciplinary
Changshuai Wang, Yunsheng Wu, Hui Li, Lanzhang Zhou
Summary: The addition of moderate phosphorous has been found to improve the stress rupture properties of super-alloys by forming a phosphorous-rich layer around carbides. Atom probe tomography revealed the segregation of phosphorous at the carbide and grain boundaries, which inhibits the coarsening and coalescence of carbides.
Article
Materials Science, Multidisciplinary
Rashad A. Al-Hammadi, Rui Zhang, Chuanyong Cui, Zijian Zhou, Yizhou Zhou
Summary: This article discusses a Ni-Co-base superalloy with a service temperature of 750 degrees C, which contains refractory and gamma'-phase forming elements that contribute to high deformation resistance, low thermoplasticity, and a limited hotworking window. By coarsening the gamma'-phase, dynamic recrystallization (DRX) can be facilitated and grain growth can be inhibited, resulting in small grains of less than 10 mu m. Ultimately, the alloy exhibits superplasticity with an elongation of 1650% at temperatures below 1000 degrees C and a high strain rate of 0.01/s.
Article
Materials Science, Multidisciplinary
Rashad A. Al-Hammadi, Rui Zhang, Chuanyong Cui, Zijian Zhou, Yizhou Zhou
Summary: A coarse-grained alloy with an average grain size of 85 μm exhibited near-superplastic tensile elongation at high temperature and strain rate. Dynamic recrystallization process alleviated stress concentration and damage accumulation, thereby improving the ductility of the material.
Article
Materials Science, Multidisciplinary
Zan Zhang, Jicheng Zhuo, Jiachen Kang, Dejian Sun, Yongsheng Li
Summary: The low-cost and high-performance FGH4096 superalloy was prepared by using the hot oscillatory pressure (HOP) sintering method to replace high-cost fine powder particles with coarse particles. The study investigated the effects of powder particle size on the grain size and mechanical properties of the superalloy. The results showed that the HOP samples with coarse powder exhibited higher tensile strength and elongation compared to the samples prepared by hot-press with finer powder. Additionally, HOP sintering effectively inhibited prior particle boundaries (PPB) in powder metallurgy superalloys, providing a strategy for low-cost and high-performance superalloys.
Article
Materials Science, Multidisciplinary
Chun Woong Park, Won June Choi, Jongmin Byun, Young Do Kim
Summary: This study analyzed the effects of high-energy ball milling of atomized powder on the microstructure and mechanical properties of a Ni-based oxide dispersion strengthened alloy. The results showed that alloys fabricated using ball-milled powders had finer oxide particles and improved oxide dispersion compared to those fabricated using atomized powders. The ball-milled alloys also exhibited improved hardness and high-temperature compressive strength.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Xingjun Liu, Zhongfeng Chen, Yuechao Chen, Shuiyuan Yang, Yunwei Pan, Yong Lu, Shasha Qu, Yingju Li, Yuansheng Yang, Cuiping Wang
Summary: The study investigated the microstructure, phase transformation temperature, lattice misfit, and mechanical properties of Co-4Ti-10V-2W-2Ta alloy. It was found that Ti, W, and Ta have a strong tendency to partition to the γ' phase, leading to a high γ' solvus temperature in the alloy. The alloy exhibited a low γ/γ' lattice misfit and excellent yield strength at high temperatures, comparable to Co-12Ti-4Mo alloy.
Article
Chemistry, Physical
A. Coyne-Grell, J. Blaizot, S. Rahimi, I. Violatos, S. Nouveau, C. Dumont, A. Nicolay, N. Bozzolo
Summary: This study investigates the recrystallization mechanisms in different grain populations of the Ni-based superalloy AD730. The results show that the local microstructure affects the operative recrystallization mechanism, leading to different mechanisms in the deformed and recrystallized regions. The interaction of recrystallization with precipitates plays a central role in dynamic recrystallization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
D. Kokabi, A. Kaflou, R. Gholamipour, M. Pouranvari
Summary: This paper investigates the correlation between the process, microstructure, and strength during dissimilar brazing of TiAl alloy to IN738 Ni-based superalloy using Ni-4Si-3.2B filler metal. The solid/liquid reactions, solidification phenomena, and solid-state phenomena are analyzed. It is found that the sizes of the athermally solidified zone and reaction layer are two key factors controlling the joint strength. The bonding temperature and holding time can be characterized using the Larson-Miller parameter (LMP), and the shear strength of the joint can be formulated regarding LMP. The highest shear strength is achieved with the optimum value of LMP.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Li Yu, Zheng Lu, Shibo Peng, Xiaolong Li
Summary: In this study, a Ni-based ODS superalloy was prepared by mechanical alloying and hot isostatic pressing. The influence of hot rolling and annealing on nanoscale oxides, grain, and high temperature tensile properties was investigated. The results showed the formation of high-density nanoscale oxides in the alloy, and the size and density of the oxides were affected by hot rolling and annealing. Decreasing the reduction ratio or annealing temperature resulted in smaller oxide size and higher number density. The grain size and aspect ratio increased with higher annealing temperature, leading to improved ultimate tensile strength and ductility at 800 degrees C. Additionally, increasing the rolling reduction ratio refined the grain size and reduced the grain aspect ratio in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Dennis Edgard Jodi, Tomonori Kitashima, Alok Singh, Makoto Watanabe
Summary: The effects of annealing on the microstructure of pure Ni fabricated by laser powder bed fusion (LPBF) were studied using Gaussian and flat-top beam profiles. The initial as-fabricated samples had a predominantly arrangement of statistically stored dislocations. The as-annealed specimens showed minimal static recrystallization, despite the high dislocation density in the as-fabricated samples. However, both types of specimens showed static recovery, with the Gaussian-LPBF-derived specimens exhibiting more prominent misorientation of dislocation boundaries.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
E. J. Sullivan, J. A. Tomko, J. M. Skelton, J. M. Fitz-Gerald, P. E. Hopkins, J. A. Floro
Summary: Scanning laser melting was used to investigate directional solidification in Al-Cu thin films. Regular lamellar microstructure was observed in eutectic films, while a complex lamellar structure was found in hypoeutectic films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xinxin Liu, Taiwen Huang, Jiachen Zhang, Dong Wang, Jian Zhang, Rui Hu, Jun Zhang, Lin Liu
Summary: The study revealed that long-term thermal exposure at 900 degrees C caused degradation of microstructure and significant reduction in rupture life of the alloy, attributed to changes in gamma' precipitates and misfits between gamma and gamma'.
Article
Chemistry, Physical
Sunil Kumar Tiwari, Akula Umamaheswara Rao, Vipin Chawla, Paritosh Dubey, Vikas Saxena, Amit K. Chawla, Devesh Kumar Avasthi
Summary: Ni3Al and Nickel-rich Ni3Al thin films were deposited on Si substrates using magnetron sputtering and co-sputtering processes. The effects of Ni enrichment on the elemental composition, microstructure, surface topography, and mechanical properties were investigated. The results showed that the hardness and young's modulus decreased with increasing Ni content, while the surface roughness affected the hydrophobic properties. The study demonstrated that surface roughness, microstructure, and elemental composition influenced the mechanical and hydrophobic properties of the Ni3Al coatings.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Chun-Liang Chen, Sutrisna
Summary: In this study, the Co9Al8W superalloy was used as a binder phase for a new tungsten heavy alloy (WHA). The effects of the binder phase, nano-Y2O3 oxides, and mechanical alloying on the microstructure evolution and mechanical properties of the model WHAs were investigated. The presence of the Co9Al8W binder phase stabilized the formation of solid phase during sintering. The interaction between dispersed oxide particles and the Al element resulted in the formation of complex nanoscale Al-Y-O oxides, which refined the microstructure and significantly influenced the mechanical properties of the alloys. However, the alloys exhibited a porous microstructure due to the presence of Al-rich oxides and pores, leading to the formation of micro-cracks and reduced material ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Li Yu, Zheng Lu, Jiabei Xian, Xuanyu Chen
Summary: Two kinds of Zr-containing Ni-based ODS superalloys, ODS-Zr and ODS-Zr+Hf, were prepared by high-energy milling and HIP process. The addition of Hf significantly changed the oxide type and refined the oxide size. The size difference between the two alloys is attributed to different oxide constitution. Moreover, Hf addition enhanced the tensile strength at 25°C and 700°C and improved the tensile ductility at 700°C.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Deyong Zheng, Huihui Jin, Yucong Liao, Pengxia Ji
Summary: In this study, a highly stable and efficient catalyst, fluorine-doped Co3O4 (F-Co3O4), was developed for hydrogen production by water electrolysis. The F-Co3O4 catalyst exhibited a remarkable reduction in overpotential and demonstrated excellent stability for over 100 hours.
Article
Materials Science, Multidisciplinary
Ziwen Lv, Jintao Wang, Fengyi Wang, Jianqiang Wang, Fuquan Li, Hongtao Chen
Summary: Adding Cu6Sn5 nano particles can effectively inhibit the overgrowth of intermetallic compounds at the interfaces of solder joints in electronic devices, providing a solution to this issue. A new growth mechanism of intermetallic compounds at the interfaces was identified.
Article
Materials Science, Multidisciplinary
Jun Wang, Jiawei Chen, Wanru Liao, Fangyang Liu, Min Liu, Liangxing Jiang
Summary: A BiOI/AgI/Ag plasmonic heterostructure photocathode was successfully designed through electrodeposition, ion-exchange, and illumination methods. This photocathode exhibits superior performance in photoelectrochemical water splitting.
Article
Materials Science, Multidisciplinary
Xiaoxiao Liu, Xianxian Zhou, Xiaotao Ma, Qinbo Yuan, Shibin Liu
Summary: In this study, the authors propose a method to accelerate the reaction of polysulfides in lithium-sulfur batteries using a Ni@OC Mott-Schottky heterojunction as a catalyst. The experimental results demonstrate that the charge redistribution at the Ni@OC interface accelerates electron transfer and enhances catalytic activity, leading to improved reaction kinetics and battery performance.
Article
Materials Science, Multidisciplinary
Dayou Ma, Mohammad Rezasefat, Joziel Aparecido da Cruz, Sandro Campos Amico, Marco Giglio, Andrea Manes
Summary: The matrix has a significant effect on the impact resistance of composite materials. Replacing a brittle polymer with a more flexible one can improve impact resistance, but it poses challenges to standard testing methods. This study designs a new fixture for testing the low-velocity impact of soft composites and investigates the effect of the fixture on the mechanical performance.
Article
Materials Science, Multidisciplinary
Lingchang Wang, Qihang Yang, Huzhen Li, Ming Wei, Qian Wang, Zhenzhong Hu, Mengmeng Zhen
Summary: Bronze titanium dioxide (TiO2(B)) is a promising anode material for lithium-ion batteries due to its high specific capacity. However, its practical applications are hindered by poor conductivity and limited electrochemical kinetics. In this study, TiO2(B)-carbon nanosheets heterostructures are synthesized to enhance the cycling performance and rate capability of TiO2(B).
Article
Materials Science, Multidisciplinary
Atul Thakur, Ritesh Verma, Ankush Chauhan, Fayu Wan, Preeti Thakur
Summary: In this study, BaFe12O19 and BaFe12O19: Epoxy (50:50) nanocomposites were synthesized using the co-precipitation method. The structural information and material properties, such as crystallite size and electrical conductivity, were characterized by XRD, FESEM, EDX, and TEM techniques.
Article
Materials Science, Multidisciplinary
Jingyu Wu, Xinyan Ma, Yong Yang
Summary: A well-defined CoS2@NC(CS-500) hierarchical binder-free catalyst cathode is constructed through in-situ grown of ZIF-67 on carbon cloth and high-temperature carbonization. The cathode shows excellent reaction kinetics and electrochemical performance, providing inspiration for developing advanced Li-CO2 battery catalysts.
Article
Materials Science, Multidisciplinary
Svetlana M. Posokhova, Vladimir A. Morozov, Kirill N. Boldyrev, Dina Deyneko, Erzhena T. Pavlova, Bogdan I. Lazoryak
Summary: This study explores the impact of synthesis method and composition on the structure and luminescence properties of K5Eu1-xHox(MoO4)4 with the palmierite-type matrix. The co-doping of Eu3+ and Ho3+ ions plays a critical role in manipulating charge transfer and luminescence efficiency in the visible and infrared regions.
Article
Materials Science, Multidisciplinary
Jian Wang, Yeting Tao, Jingsheng Wang, Youtian Tao
Summary: A new electron-transport material iTPyBI-CN is developed through non-catalytic C-N coupling reaction. It exhibits better electroluminescence efficiency in organic light-emitting diodes compared to the commercial material TPBI, due to its twisted geometry and higher energy levels.
Article
Materials Science, Multidisciplinary
Tao Zhu, Feng Huang, Shuo Li, Yang Zhou
Summary: This article combines XRD analysis and microscopic structural observation to investigate the changes in limestone after high-temperature treatment. It finds that 500 degrees C is the critical temperature for crystalline and spatial arrangement changes in limestone, and the thermal conductivity, specific heat capacity, and heat storage coefficient gradually decrease after thermal treatment.
Article
Materials Science, Multidisciplinary
Muhammad Haekal Habibie, Fransiska Sri Herwahyu Krismastuti, Abdi Wira Septama, Faiza Maryani, Vivi Fauzia
Summary: This study focuses on the synthesis of zinc oxide nanostructure from zinc recovered from galvanization ash and highlights its potential as a sustainable source of zinc and as an antibacterial agent.
Article
Materials Science, Multidisciplinary
Jingyi Li, Yixin Xing, Wei Gu, Shousi Lu
Summary: In this study, PC@CaP microparticles were fabricated using biomimetic mineralization. The results showed that under environmental stress, PC@CaP exhibited improved stability and antioxidative activity, indicating its potential use in high-added value fields.
Article
Materials Science, Multidisciplinary
Yan Liu, Shunyou Chen
Summary: In this study, TNTs were used as a drug carrier and modified with ZIF-8 and silk fibroin to obtain a new drug loading platform. The results showed that this drug-loaded platform had a good drug release effect in vitro and could promote cell proliferation and osteogenic differentiation.
Article
Materials Science, Multidisciplinary
Chunhui Zhu, Wentao Wang, Qing Zhen, Xinning Huang, Shixin Li, Shaochang Wang, Xiaoping Ma, Xiaoxia Liu, Yalong Jiao, Kai Sun, Zhuangzhi Li, Huaixin Yang, Jianqi Li
Summary: A type of stacking fault is revealed in e-InSe crystal, which is associated with a small stacking-fault energy and shows exceptional plasticity.