Article
Chemistry, Physical
Anna Bodyakova, Maksim Tkachev, Georgy Raab, Rustam Kaibyshev, Andrey N. Belyakov
Summary: The effect of severe plastic deformation through ECAE-Conform and cold rolling on the microstructures of Cu-0.1Cr-0.1Zr alloy was investigated. The results showed that an increase in ECAE-Conform strain improved grain refinement and subsequent cold rolling further led to grain size reduction and strengthening. The fraction of ultrafine grains with a size of 160 nm increased with an increase in the number of ECAE-Conform passes, resulting in a higher yield strength of above 550 MPa.
Article
Engineering, Mechanical
Yila Gaqi, Kenta Kusumoto, Kazumichi Shimizu, Riki Hendra Purba
Summary: Both erosive and abrasive wear are common in mechanical systems and moving components in industrial production. Previous research has shown that high-chromium cast iron (HCCI) experiences repeated particle impacts, resulting in the formation of fine fracture carbides. This research examined the orientation of carbides on the microstructure and their effects on erosion and abrasion properties, and found that high-alloy cast irons with 27 wt.% chromium content showed the best wear resistance properties due to the coarse strips of M7C3 carbides.
Article
Nanoscience & Nanotechnology
Tian Liu, Xiaonong Cheng, Rui Luo, Yu Cao, Hengnan Ding, Leli Chen, Yuyan Yang, Yu Liu
Summary: The plastic thermal deformation behaviors of solid solution strengthened Ni-based superalloy Inconel 617B at different temperatures were systematically investigated, with the steady-state stress found to be positively correlated with temperature and the obstruction from M23C6 particles decreasing with the increase in temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Seyed Elias Mousavi, Ali Sonboli, Mahmood Meratian, Mohabbat Amirnejad, Seyed Hadi Mohamadi Azghandi, Paul Munroe
Summary: The study shows that low stacking fault energy alloys processed by ECAP can achieve unexpected mechanical properties, with high ductility reaching up to -80% while maintaining good tensile strength. The investigation of alloy microstructure reveals a combination of deformation mechanisms, including slip and twinning, accompanied by grain boundary serration and grain fragmentation. These deformation modes trigger the unexpected mechanical properties in this alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Valery Shabashov, Kirill Lyashkov, Kirill Kozlov, Vladimir Zavalishin, Andrey Zamatovskii, Natalya Kataeva, Victor Sagaradze, Yurii Ustyugov
Summary: The study determined a narrow temperature range of changes in the mechanism and kinetics of structural-phase transformations during mechanical alloying in high-nitrogen chromium-manganese steel, leading to abnormal behavior of the mechanical properties of the steel. The direction of nitrogen redistribution was found to change due to the acceleration of the decomposition of nitrogen-supersaturated solid solution of austenite with the formation of secondary nanocrystalline nitrides.
Article
Chemistry, Physical
Koichi Takasawa, Kenta Nishimoto, Ryo Ikeda, Kunihiko Hashi
Summary: This study investigated the hydrogen environment embrittlement (HEE) of a nickel-base superalloy, INCONEL(R) Alloy 617, using a notch tensile test in a 99 MPa hydrogen atmosphere. The function of grain boundary carbides was examined, and it was found that an increase in grain boundary coverage led to a higher ratio of intergranular fracture surface. Strain distribution analysis revealed localized strain accumulation near the grain boundary covered with carbide. The suggested mechanism of HEE in this alloy involves crack formation at the interface between the matrix and the grain boundary carbide, followed by crack growth along the grain boundary, ultimately resulting in fracture.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Jongun Moon, Elena Tabachnikova, Sergii Shumilin, Tetiana Hryhorova, Yuri Estrin, Jamieson Brechtl, Peter K. Liaw, Wenqing Wang, Karin A. Dahmen, Alireza Zargaran, Jae Wung Bae, Hyeon-Seok Do, Byeong-Joo Lee, Hyoung Seop Kim
Summary: The medium-entropy alloy Co17.5Cr12.5Fe55Ni10Mo5 demonstrates excellent mechanical properties at cryogenic temperatures, showing high strength, ductility, and strain hardening. It exhibits several unusual features within the extremely low temperature range of 0.5-4.2 K, including anomalies in the temperature dependence of yield strength and tensile ductility, discontinuous plastic deformation (DPF), and changes in deformation-induced martensitic transformation tendency. The observed phenomena may be interrelated and require further investigation.
Article
Chemistry, Physical
Dong Sun, Shuyong Jiang, Yanqiu Zhang, Bingyao Yan, Junbo Yu
Summary: Equiatomic NiTi shape memory alloy subjected to severe plastic deformation through local canning compression exhibits different twin structures after solution treatment and subsequent annealing, which significantly influence the phase transformation behavior of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
P. A. Petrov, I. A. Burlakov, V. V. Palacheva, M. Yu. Zadorozhnyy, I. S. Golovin
Summary: The analysis examined the structure of the AA5051 alloy under different plastic deformation schemes. It was found that the sample's pre-history deformation had a significant impact on its structural transitions, with the sample subjected to compression with torsion showing higher metastability and a tendency towards recrystallization during heating and isothermal annealing.
Article
Engineering, Mechanical
Vagish D. Mishra, Ashish Mishra, Luv Verma, G. Rajesh, Balkrishna C. Rao, H. Murthy
Summary: In this study, the impact of bullets fired at high speeds on a stationary target was used to generate Functionally Graded Materials (FGMs) through high strain-rate plastic deformation. Aluminum alloy Al5052 specimens in the shape of bullets were shot at a UHMWPE target at different velocities to investigate the effects of impact speed. The results showed variations in grain refinement and hardness depending on the impact velocity, projectile shape, and target material.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Yu Gamin, Jairo Alberto Munoz Bolanos, A. S. Aleschenko, A. A. Komissarov, N. S. Bunits, D. A. Nikolaev, A. Fomin, V. V. Cheverikin
Summary: The semi-finished products from a Cu-Ni-Cr-Si alloy are produced for electrical purposes through radial-shear rolling (RSR) and heat treatment, resulting in improved mechanical properties and electrical conductivity. The alloy is thermally hardened after heat treatment due to the precipitation of fine inclusions uniformly distributed in the sample volume, leading to enhanced mechanical properties and electrical conductivity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Ch. Visweswara Rao, N. C. Santhi Srinivas, G. V. S. Sastry, Vakil Singh
Summary: The work hardening behavior of the IN-617 alloy under different conditions was studied, showing unique characteristics in terms of flow behavior. Ductile fractures with dimples were observed in the solution treated and aged conditions, while faceted fractures were seen in the cold worked conditions at both room temperature and 700 degrees C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
S. Zeisl, A. Lassnig, A. Hohenwarter, F. Mendez-Martin
Summary: The influence of severe plastic deformation on the hardness and precipitation behavior of a Co-free maraging steel was investigated in this study. It was found that severe plastic deformation transformed the microstructure, delayed austenite reversion, and accelerated and influenced the precipitation reaction, thus affecting the characteristics of intermetallic phases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jingfeng Guo, Tieshan Cao, Congqian Cheng, Jie Zhao
Summary: The carbide transformation of Cr35Ni45Nb type alloy during service involves the change from M7C3 and NbC to M23C6 and G phase. The M23C6 and G phase mix and grow together, and after carburization the M23C6 type carbide transforms back into M7C3 type carbide.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
J. C. Spadotto, M. G. Burke, I. G. Solorzano
Summary: The initiation mechanism of discontinuous precipitation (DP) reaction in Alloy 33, driven by migrating grain boundaries (GBs) at 800 degrees Celsius, was studied using analytical electron microscopy techniques. The results show that FCC M23C6 is the first phase to precipitate at the GBs, and grain boundary migration is mainly caused by a chemical driving force.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Liuming Wei, Jingwen Li, Yonggang Li, Qirong Zheng, Fan Cheng, Chuanguo Zhang, Jingyu Li, Gaofeng Zhao, Zhi Zeng
Summary: This study investigates the influence of He-V complexes on H behaviors on different W surfaces using DFT calculations. The results show that H dissolution is most difficult but H trapping is easiest on the W (110) surface, while the opposite is true on the W (111) surface. Moreover, the presence of He-V complexes increases the difficulty of H diffusion from bulk to surface and desorption.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yan Meng, Song Zeng, Chen Chen, Chaowen Zhu, Huahai Shen, Xiaosong Zhou, Xiaochun Han
Summary: The characteristics of magnetron sputtered Cr coatings vary with different temperature, bias voltage, and pressure. Coatings with random orientation, good crystallinity, and small grain size exhibit favorable oxidation behavior, while coatings with strong (200) texture, poor crystallinity, and large grains have many intrinsic defects that are detrimental to the protection property of the Cr coatings.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Xinyuan Xu, Zefeng Yu, Wei-Ying Chen, Aiping Chen, Arthur Motta, Xing Wang
Summary: This study presents an automated approach for characterizing grain morphology in TEM images recorded during ion irradiation. By combining a machine learning model and a computer vision algorithm, comparable results to human analysis can be achieved with significantly reduced analysis time. Researchers can train their own models following the procedures described in this study to automate grain morphology analysis of their own TEM images.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Shihao Wu, Dong Wang, Yapei Zhang, Koji Okamoto, Marco Pellegrini, Wenxi Tian, Suizheng Qiu, G. H. Su
Summary: The oxidation and degradation mechanisms of Cr coating on Zr alloy cladding under high temperature steam atmosphere are summarized, and a mathematical analysis model is established to predict the changes in coating thickness. The model is applied in the analysis of structure evolution under different conditions.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
V. Diaz-Mena, J. de Prado, M. Roldan, I. Izaguirre, M. Sanchez, M. Rieth, A. Urena
Summary: The brazeability of a cupronickel alloy was evaluated as a filler alloy for high-temperature joining of tungsten to steel. The study investigated the brazing conditions and the impact of the selected filler on the joint quality using numerical software. The results showed different metallurgical interactions and diffusion phenomena between the filler alloy and the base materials at different temperatures. The study emphasized the importance of selecting a suitable filler to mitigate residual stresses in the joints.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Pengcheng Zhu, Yajie Zhao, Yan-Ru Lin, Jean Henry, Steven J. Zinkle
Summary: This study investigates the effect of heavy-ion irradiation on radiation hardening in high-purity binary alloy Fe18Cr. Nanoindentation testing and high-quality TEM imaging were conducted to extract hardness and microstructure information. The strength factor was accurately calculated based on the detailed TEM characterization of irradiated microstructures, and a refined hardening superposition method was applied to quantify the mechanical properties of ion-irradiated materials.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bin Wu, Haixia Ning, Hanzhen Zhu, Jianjun Chen, Kang Wang, Daiyu Zhang, Fu Wang, Qilong Liao
Summary: This study discusses the effects of ZrO2 and B2O3 on the phase composition and properties of SAP-based glass-ceramics. The results show that ZrO2 addition improves the formation of NZP phase while restricting the crystallization of AlPO4 phases. The correct ratios of ZrO2 and B2O3 allow only the formation of NZP phase within the SAP glass.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Hwasung Yeom, Greg Johnson, Benjamin Maier, Tyler Dabney, Kumar Sridharan
Summary: Cr-Nb bilayer coatings were developed using cold spray deposition to improve the limiting operational temperature of Cr-coated Zr-alloy system. The coatings exhibited outstanding oxidation resistance at high temperatures and formed continuous intermetallic compound layers at the interfaces.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Padhraic L. Mulligan, Andrew T. Nelson, Chad M. Parish, Patrick A. Champlin, Xiang Chen, Daniel Morrall, Jason M. Harp
Summary: Environmental barrier coatings are being developed to reduce oxidation and embrittlement in Zr-based materials. Chromium nitride is a candidate for this application, but understanding its impact on irradiation-induced creep and microstructure is critical.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Dexuan Yan, Xinlei Cao, Ke Shen
Summary: This study investigated the purification mechanism of polycrystalline graphite by comparing IG-11 graphite with IG-110 nuclear grade graphite. The analysis revealed that metallic impurities in IG-11 were primarily segregated within graphite porosities, while IG-110 demonstrated a significant reduction in impurities. This research contributes to the development of innovative graphite purification techniques for greater purity and stronger oxidation resistance.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wei Xu, Wei Peng, Lei Shi, Qi Sun
Summary: This paper investigates the oxidation and shape evolution of matrix graphite in high temperature gas-cooled reactors during air-ingress accidents. A reaction kinetics model is established and computational fluid dynamics with a dynamic mesh method is used to simulate the oxidation process. The results show that the geometric shape of graphite changes significantly with increasing flow rate, and the graphite pebbles tend to form a structure with a narrow front and wide tail.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Allison Harward, Casey Elliott, Michael Shaltry, Krista Carlson, Tae-Sic Yoo, Guy Fredrickson, Michael Patterson, Michael F. Simpson
Summary: This paper investigates the hygroscopic properties of eutectic LiCl-KCl absorbed into zeolite-4A. The study finds that water absorption and corrosion worsen with increasing salt loading. It also suggests that the salt can be stored in a non-inert atmosphere for a certain period of time.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Takaaki Koyanagi, Xunxiang Hu, Christian M. Petrie, Gyanender Singh, Caen Ang, Christian P. Deck, Weon-Ju Kim, Daejong Kim, James Braun, Yutai Katoh
Summary: This study provides critical experimental data on the effects of irradiation on the hermeticity of SiC composite cladding, finding that irradiation can cause a decrease in hermeticity and cracking, and coating the outer surface can mitigate the cracking issue.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
S. Krat, A. Prishvitsyn, Yu. Gasparyan
Summary: This study proposes a probabilistic and diffusion-based model to describe the co-deposition of multiple hydrogen isotopes with slowly grown metal layers. The model calculates the relative concentrations of different hydrogen isotopes in the co-deposited metal layers. It is found that if hydrogen isotopes have different detrapping energies, only the isotope with the highest detrapping energy shows a monotonic decrease in concentration with deposition temperature. Furthermore, the study evaluates the uncertainty of tritium concentration in the co-deposited layer based on the uncertainty in detrapping energy of tritium and deuterium, predicting a >10% tritium concentration uncertainty for a 0.01 eV difference.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tijo Vazhappilly, Arup Kumar Pathak
Summary: This study investigates the effect of Ce atom substitution in UO2 on its thermophysical properties using density functional theory. The results show that the Ce substitution levels and the oxidation state of Ce/U atoms strongly influence the band structure and specific heat capacity of the UO2 lattice. These findings provide important insights into the fuel properties of UO2 under reactor conditions.
JOURNAL OF NUCLEAR MATERIALS
(2024)