Article
Materials Science, Multidisciplinary
P. Dinesh, S. P. KumareshBabu, S. Natarajan
Summary: The study found that the addition of lanthanum can induce microstructural changes and mechanical characteristics in Mg-9Li-3Al alloys. The addition of an appropriate amount of lanthanum is beneficial to the alloy system, resulting in grain refinement and increased tensile strength, while excessive addition may lead to grain coarsening and reduced mechanical strength.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Physical
P. V. Panin, A. V. Zavodov, E. A. Lukina
Summary: The evolution of microstructure in a new alloy Ti-44.5Al2V-1Nb-2Cr-0.1Gd during high temperature isothermal exposures was systematically studied, revealing an increase in nano-sized gadolinium oxide particles without significant impact on alloy ductility.
Article
Chemistry, Multidisciplinary
Xin Li, Cheng Wang, Haijuan Ju, Zhuoyue Li
Summary: This paper proposes a surface defect detection model based on an improved YOLOv5 object detection algorithm to address the low efficiency and poor accuracy issues in conventional methods. The model recalculates the parameters of preset anchors using a k-means clustering algorithm, adds an attention mechanism, and improves the neck network structure. Experimental results show that the proposed model achieves higher accuracy and lower inference time compared to other object detection algorithms, making it efficient and suitable for practical applications.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
Ashok K. Verma, P. Modak
Summary: This study examines the high pressure structural aspects of thorium dialuminide, ThAl2, and predicts a phase transition from the ambient AlB2-type hexagonal structure to a P6(3)/mmc hexagonal structure above 2.4 GPa. The new structure remains stable up to 50 GPa, indicating a different behavior from previous findings. Analysis of electronic structures and chemical bonding reveals that a change in Al-Al bonding under pressure is responsible for the structural phase transition. Additionally, a high P-T phase diagram is computed, showing that a MgCu2-type structure becomes stable only under high P-T conditions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yun-Qi Tong, Lin Chen, Guan-Jun Yang
Summary: The new abradable seal coating with a spherical closed-pore structure has both lower hardness and higher bonding strength compared to conventional coatings. It showed excellent abradability in high-speed scraping test, promising to improve the efficiency and reliability of the next generation aero-engine.
Article
Automation & Control Systems
Yupeng Hao, Shengqiang Yang, Dongxiang Li, Wenhui Li, Xiuhong Li
Summary: Severe casting defects on the cavity surface of aero-engine integral casting casing have been found, affecting cleanliness and surface integrity, thus limiting the casing's service performance. Vibratory finishing shows great potential for closed cavities due to its fluidized nature. Through experiments on the particle separator main casing of a turboshaft aero-engine, a new idea of pre-loading the media and changing the spatial posture of the casing was proposed and tested. The results showed that vibratory finishing was feasible for the casting casing, improving surface morphology, cleanliness, corrosion resistance, and mechanical properties. This process offers a new approach for cavity finishing of casings.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Aerospace
Huizhi Qi, Yaqing Lu, Shufang Song, Qiannan Xu
Summary: Fatigue reliability analysis in aero-engine design is crucial for predicting fatigue life, evaluating faults, and guiding maintenance. The developed fatigue reliability analysis system based on the ABAQUS-MATLAB platform has been proven to be accurate and effective through statistical analysis and parameter estimation.
INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING
(2022)
Review
Crystallography
Santosh Sampath, Vignesh Pandian Ravi, Srivatsan Sundararajan
Summary: Nickel aluminides possess desirable properties for high-temperature applications, but the challenges of processing and machining hindered their benefits in the 1990s. However, advancements in manufacturing techniques, understanding of aluminide microstructure and deformation processes, and developments in micro-alloying have contributed to the progress of nickel aluminides. This paper provides a comprehensive overview of the key developments, manufacturing methods, and challenges in producing nickel aluminides, as well as their applications and current trends.
Article
Chemistry, Physical
Michaela Stamborska, Juraj Lapin, Kateryna Kamyshnykova
Summary: The preparation, microstructure, and mechanical behaviour of Ni3Al-based superalloy were studied. It was found that the heat-treated alloy had a uniform distribution of MC carbides and γ'(Ni3Al) precipitates. The equivalent plastic strain distribution was calculated using finite element analysis, and a correlation curve between Vickers microhardness values and equivalent plastic strains was proposed to quantify the local strain hardening state.
Article
Engineering, Mechanical
Peng Jin, Xin Zhou, Chen Wang, Jinquan Huang, Wenxiang Zhou, Feng Lu
Summary: This paper focuses on recognizing the health state of aero-engine components in networked control systems (NCSs) using distributed linear Kalman filtering (DKF), taking into account time delays and data packet drops that result in system uncertainty. The paper proposes a novel distributed linear Kalman filter with the memory principle (MDKF) to overcome the timeliness issue by using buffers with a memory mechanism in the fusion center. Different weights are assigned based on the time series of state signals stored in the buffer to achieve an unbiased result. The fusion process involves a more practical layout of fusion state data to reduce the impact of uncertainty and computational constraints in NCS.
NONLINEAR DYNAMICS
(2023)
Article
Materials Science, Multidisciplinary
Andrea Skolakova, Jana Korberova, Petr Kratochvil, Pavel Salvetr, Davy Deduytsche, Pavel Novak
Summary: In this study, Ni-14Al, Ni-30Al, and Ni-58Al alloys representing Ni3Al, NiAl, and NiAl3 phases were prepared by reactive sintering. The preferential formation of Ni2Al3 phase in all alloy compositions was observed, which was controlled by diffusion.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
L. Peng, G. Zeng, J. Xian, C. M. Gourlay
Summary: The influence of iron on the formation of Al-Mn-Fe intermetallic compounds (IMCs) has been investigated. It was found that the iron content affects the phase fractions and morphology of the IMCs.
Article
Energy & Fuels
Teresa Castiglione, Diego Perrone, Luciano Strafella, Antonio Ficarella, Sergio Bova
Summary: This research proposes linear models for advanced control systems and direct fuel control in the presence of component degradation. Results show high accuracy in predicting output engine variables for both models, with mean errors below 1%. The Small Perturbation approach is identified as the best candidate for controller development when predicting component degradation.
Article
Chemistry, Physical
Rene Daniel Puetz, Daniela Zander
Summary: The role of (Fe,Al)(2)Nb Laves phase in the oxidation mechanisms of Fe-26Al-4Nb alloy at temperatures ranging from 700 to 1000 degrees C was investigated. Selective oxidation of the Laves phase occurred at all temperatures, resulting in the formation of different oxides. At 700 and 800 degrees C, unharmed Laves phase was observed below the oxide scale, while at 900 and 1000 degrees C, no unharmed Laves phase was found. The kinetics of oxidation changed after 10 hours at 700 and 800 degrees C, and the Laves phase was identified to initiate oxide spallation at 1000 degrees C.
Article
Chemistry, Physical
Songjun Wang, Jianjun He, Weiping Li, Zhihui Gong, Libo Zhou, Jungang Yang, Yuhui Cai, Yuexin Du
Summary: In order to understand the premature crack sprouting phenomenon of aero-engine hotend component, high-temperature tensile and in-situ EBSD tests were conducted on alloy K4169. The research revealed the mechanical properties and microstructure changes of K4169 alloy under different temperature working conditions. The study also discovered the formation and propagation process of cracks in the alloy, and the transition of fracture mechanism from ductile to mixed ductile-brittle model at the operating temperature.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
M. H. Abbasi, R. Tavakoli, S. G. Shabestari
Summary: The correlation between atomic-scale structure and glass-forming ability of ternary bulk metallic glasses was investigated using molecular dynamics simulation. It was found that the potential energy of the icosahedra reflects the geometric ordering, while the virial stress energy density reveals the chemical ordering. Based on this discovery, a new prediction criterion for glass-forming ability was proposed and validated using experimental data.
Article
Chemistry, Physical
Haimin Zhai, Shuai Cui, Sheng Li, Dongqing He, Bo Cheng, Xinjian Zhang, Wensheng Li, Zhornik Viktor, Uladzimir Seniuts
Summary: Laser shock peening (LSP) treatment significantly affects the phase structure and properties of titanium-based BMG materials, promoting rejuvenation and introducing heterogeneity. This leads to improved plasticity and resistance to crack propagation. LSP-1 specimen exhibits higher hardness and plasticity, reducing fatigue peeling wear caused by brittleness. However, excessive LSP results in increased susceptibility to pitting and significantly reduces tribocorrosion resistance.
Article
Chemistry, Physical
Olga A. Blatova, Maria A. Solodovnikova, Ekaterina M. Egorova, Vladislav A. Blatov
Summary: This study applied a universal geometrical-topological approach to analyze the crystal structures of intermetallic compounds deposited in the Inorganic Crystal Structure Database. By exploring the local atomic configurations, they identified different types of coordination polyhedra and proposed criteria for determining geometric instability. This research provides useful indicators for checking crystallographic information and validating structural models.
Article
Chemistry, Physical
Jose M. Torralba, Diego Iriarte, Damien Tourret, Alberto Meza
Summary: The amount of globally recycled e-waste is less than 20% of the total produced. One of the causes for this low recycling rate is the complex and expensive selective sorting of metals. However, recent research has shown that high entropy alloys (HEAs) can be made from complex alloy mixtures, reducing the dependence on pure critical metals. It has been demonstrated that e-waste can be used to produce competitive HEAs.
Article
Chemistry, Physical
M. Y. He, Y. F. Shen, N. Jia, W. Y. Xue, J. P. Li
Summary: This study successfully improved the mechanical properties of high-entropy alloys (HEAs) through phase decomposition modulation, achieving strengthening of low-cost CuFeMnNi HEAs. The annealed HEAs exhibited excellent mechanical properties, with significantly increased yield strength and maintained satisfactory elongation.
Article
Chemistry, Physical
D. V. Louzguine-Luzgin, F. R. Pratama
Summary: In this study, the growth rate of a crystalline phase in the Al-Fe-Mn-Si metallic glass was measured in real time using transmission electron microscopy. The effective diffusion coefficient related to the slowest diffusing element (Mn) was estimated. The results showed that the growth rate of the crystalline phase was significantly faster compared to pure Al and AlFe compound.
Article
Chemistry, Physical
Zhenhua Han, Yubo Tian, Jun Yang, Jianzhao Li, Jinyang Zhang, Gang Liu, Ran Wei, Guojun Zhang
Summary: In this study, a novel medium-entropy alloy (MEA) (Fe65Ni15Cr10Co10)92Ti5Al3 with a dual heterogeneous structure was developed by adding Ti and Al to a previously reported Fe65Ni15Co10Cr10 MEA. The MEA exhibited ultra-high ultimate tensile strength and work hardening extent at room temperature. The addition of Ti and Al induced precipitation and resulted in a continuous FCC -> BCC martensitic transformation and a transformation-induced plasticity effect. The excellent mechanical properties of the alloy were attributed to the synergistic effects of hetero-deformation induced strengthening, precipitation strengthening, and TRIP.
Article
Chemistry, Physical
S. Y. Liang, L. T. Zhang, B. Wang, Y. J. Wang, E. Pineda, J. C. Qiao
Summary: This study focuses on the influence of the thermomechanical protocol on the aging or rejuvenation of glass by decoupling the thermal and mechanical processes. The results show that Labased metallic glass exhibits material hypomnesia, with a clearer rejuvenation trend observed after imposing increasing amplitude strain oscillations. There is a threshold value of the oscillation amplitude that separates the effects of the protocol into acceleration of aging or rejuvenation. This study reveals the correlation between the thermomechanical properties of metallic glass and the previous application of strain oscillations of various amplitudes, providing an effective tool for regulating the structural state of metallic glasses through a simple-operated method.
Article
Chemistry, Physical
Chihui Liu, Hua Zhang, Qing Wang, Panzhi Wang, Jiadian Yang, Fanchao Meng, Xin Zhou, Lilong Zhu, Shangzhou Zhang, Liang Jiang
Summary: Thermal deformation behavior and microstructure evolution of GH141 alloy were efficiently studied using high-throughput double-cone gradient compression. Different compression temperatures resulted in a wide gradient equivalent strain distribution and gradient microstructure. The dynamic recrystallization mechanism shifted towards discontinuous dynamic recrystallization with increasing compression temperature.
Article
Chemistry, Physical
D. Dubaux, J. Zollinger, M. -C. de Weerd, J. Ghanbaja, S. Mathieu, S. Migot, P. Boulet, S. Sturm, V. Fournee, M. Sicot, J. Ledieu
Summary: We report the formation of large and highly twinned dendrites of the Al13Fe4 approximant phase embedded in an fcc Al-rich matrix. Using a rapid cooling technique, the approximant appears as a 10-fold dendrite. The grain distributions within the arm are complex and a single dendrite arm can contain up to four different orientations. Three types of twins, namely {100}, {001} and {201} twins, have been identified. A growth mechanism involving heteroepitaxial growth from a decagonal Al-Fe quasicrystalline seed is proposed to explain the formation of these specific 10-fold motifs.
Article
Chemistry, Physical
Ming Yang, Yibo Zhang, Jie Dong, Yan Huang, Zhichao Lu, Liang Wang, Xuerui Wei, Zhengdong Fu, Jinkui Zhao, Wenli Song, Wei Li, Yuntao Liu, Dong Ma
Summary: A multi-element microalloying strategy has been used to improve the microstructure and mechanical properties of CuZr-based bulk metallic glass composites. Microalloying effectively refines the CuZr phase and results in finely dispersed B2 crystallites embedded in the BMG matrix, leading to the formation of centimeter-sized BMGCs with good mechanical properties.
Article
Chemistry, Physical
Xuejie Zhu, Xuexi Zhang, Mingfang Qian, Ziyi Wang, Aibin Li, Zongning Chen, Muhammad Imran, Lin Geng
Summary: The homogeneous superelastic behavior in shape memory alloys (SMAs) is crucial for their functional and structural fatigue properties, as well as their stable elastocaloric effect (eCE). In this study, a Ti-22Nb-4Zr-2Ta plate was prepared with a strong recrystallized texture, resulting in a completely recoverable superelastic strain and narrow hysteresis. The observation of strain and temperature evolution revealed the importance of diffuse transformation and favorable texture in achieving mesoscopically homogeneous transformation and related elastocaloric effect.
Article
Chemistry, Physical
Mohammad Navazani, Sitarama Raju Kada, Daniel Fabijanic, Matthew Barnett
Summary: This study investigates the effect of Cu and Al addition on an alloy containing multiple principal elements. The results show that adding small amounts of Cu can improve the alloy's ductility and the hardness of the FCC phase can be predicted using a hybrid model. Unlike previous studies, the corrosion resistance of the alloy is not affected by Cu addition, indicating its potential for further development into a fine-grained stainless steel alloy.
Article
Chemistry, Physical
Fatemeh Azizian, Homam Naffakh-Moosavy, Fatemeh Bagheri
Summary: Novel biodegradable Zn-xCu-0.8Mn-0.4Ag alloys were prepared in this study, and the effects of Cu addition and hot extrusion process on microstructure, mechanical properties, and cytotoxicity of the alloys were investigated. The results showed that adding copper and performing a hot extrusion process can significantly improve the mechanical properties of the alloys, making them potential candidates for cardiovascular stents.
Article
Chemistry, Physical
Ivan A. Ditenberg, Denis A. Osipov, Ivan Smirnov, Konstantin V. Grinyaev
Summary: This study investigates the effect of high-temperature annealing on the structural-phase state and microhardness of Ni3Al samples obtained by spark plasma sintering after high-energy ball milling. The results show that certain annealing temperatures promote grain growth and high-density nucleation, leading to the formation of a fine-grained structural state. The study also analyzes the influence of annealing temperature on the strengthening mechanisms.