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Literatura académica sobre el tema "Multi-Element alloys"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Multi-Element alloys"

Reiberg, Marius, Leonhard Hitzler, Lukas Apfelbacher, Jochen Schanz, David Kolb, Harald Riegel y Ewald Werner. "Additive Manufacturing of CrFeNiTi Multi-Principal Element Alloys". Materials 15, n.º 22 (8 de noviembre de 2022): 7892. http://dx.doi.org/10.3390/ma15227892.

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High entropy alloys (HEAs) and their closely related variants, called multi-principal element alloys (MPEAs), are the topic of a rather new area of research, and so far, the gathered knowledge is incomplete. This is especially true when it comes to material libraries, as the fabrication of HEA and MPEA samples with a wide variation in chemical compositions is challenging in itself. Additive manufacturing technologies are, to date, seen as possibly the best option to quickly fabricate HEA and MPEA samples, offering both the melting metallurgical and solid-state sintering approach. Within this study, CrFeNiTi MPEA samples were fabricated via laser powder-bed fusion (PBF-LB) and solid-state sintering of mechanically alloyed powder feedstock. The main emphasis is on the PBF-LB process, while solid-state sintering serves as benchmark. Within a volumetric energy density (VED) window of 50 J/mm³ to 83 J/mm³, dense samples with large defect-free sections and an average micro-hardness of 965 HV0.1 were fabricated. Clear correlations between the local chemical alloy composition and the related micro-hardness were recorded, with the main factor being the evaporation of titanium at higher VED settings through a reduction in the C14_Laves phase fraction.

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Liu, Li, Ramesh Paudel, Yong Liu, Xiao-Liang Zhao y Jing-Chuan Zhu. "Theoretical and Experimental Studies of the Structural, Phase Stability and Elastic Properties of AlCrTiFeNi Multi-Principle Element Alloy". Materials 13, n.º 19 (30 de septiembre de 2020): 4353. http://dx.doi.org/10.3390/ma13194353.

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The fundamental challenge for creating the crystal structure model used in a multi-principle element design is the ideal combination of atom components, structural stability, and deformation behavior. However, most of the multi-principle element alloys contain expensive metallic and rare earth elements, which could limit their applicability. Here, a novel design of low-cost AlCrTiFeNi multi-principle element alloy is presented to study the relationship of structure, deformation behavior, and micro-mechanism. This structured prediction of single-phase AlCrTiFeNi by the atomic-size difference, mixing enthalpy ΔHmix and valence electron concentration (VEC), indicate that we can choose the bcc-structured solid solution to design the AlCrTiFeNi multi-principle element alloy. Structural stability prediction by density functional theory calculations (DFT) of single phases has verified that the most advantageous atom occupancy position is (FeCrNi)(AlFeTi). The experimental results showed that the structure of AlCrTiFeNi multi-principle element alloy is bcc1 + bcc2 + L12 phases, which we propose as the fundamental reason for the high strength. Our findings provide a new route by which to design and obtain multi-principle element alloys with targeted properties based on the theoretical predictions, first-principles calculations, and experimental verification.

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Derimow, N., R. F. Jaime, B. Le y R. Abbaschian. "Hexagonal (CoCrCuTi)100-Fe multi-principal element alloys". Materials Chemistry and Physics 261 (marzo de 2021): 124190. http://dx.doi.org/10.1016/j.matchemphys.2020.124190.

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Qiu, Haochen, Xuehui Yan, Shuaishuai Wu, Wei Jiang, Baohong Zhu y Shengli Guo. "High-Throughput Preparation and Mechanical Property Screening of Zr-Ti-Nb-Ta Multi-Principal Element Alloys via Multi-Target Sputtering". Coatings 13, n.º 9 (20 de septiembre de 2023): 1650. http://dx.doi.org/10.3390/coatings13091650.

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Zr-Ti-Nb-Ta alloys were synthesized in parallel via multi-target co-sputtering deposition with physical masking in a pseudo-ternary Ti-Nb-ZrTa alloy system. Sixteen alloys with distinct compositions were obtained. Comprehensive characterization of phase structure, microstructure, Young’s modulus, and nanoindentation hardness was undertaken. The Ti-Nb-ZrTa alloys exhibited two typical phase structures: a single-BCC solid-solution structure, and an amorphous structure. Nanoindentation quantification confirmed a Young’s modulus ranging from 110 to 130 GPa, alongside nanoindentation hardness spanning 3.6 to 5.0 GPa. The combination of good hardness and a relatively low Young’s modulus renders these alloys promising candidates for excellent biomedical materials. This work not only offers an effective method for the high-throughput synthesis of multi-principal element alloys, but also sheds light on a strategy for screening the phase structure and mechanical performance within a given alloy system.

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Beyramali Kivi, Mohsen, Yu Hong y Mohsen Asle Zaeem. "A Review of Multi-Scale Computational Modeling Tools for Predicting Structures and Properties of Multi-Principal Element Alloys". Metals 9, n.º 2 (20 de febrero de 2019): 254. http://dx.doi.org/10.3390/met9020254.

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Multi-principal element (MPE) alloys can be designed to have outstanding properties for a variety of applications. However, because of the compositional and phase complexity of these alloys, the experimental efforts in this area have often utilized trial and error tests. Consequently, computational modeling and simulations have emerged as power tools to accelerate the study and design of MPE alloys while decreasing the experimental costs. In this article, various computational modeling tools (such as density functional theory calculations and atomistic simulations) used to study the nano/microstructures and properties (such as mechanical and magnetic properties) of MPE alloys are reviewed. The advantages and limitations of these computational tools are also discussed. This study aims to assist the researchers to identify the capabilities of the state-of-the-art computational modeling and simulations for MPE alloy research.

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Scully, John R., Samuel B. Inman, Angela Y. Gerard, Christopher D. Taylor, Wolfgang Windl, Daniel K. Schreiber, Pin Lu, James E. Saal y Gerald S. Frankel. "Controlling the corrosion resistance of multi-principal element alloys". Scripta Materialia 188 (noviembre de 2020): 96–101. http://dx.doi.org/10.1016/j.scriptamat.2020.06.065.

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Charpagne, M. A., K. V. Vamsi, Y. M. Eggeler, S. P. Murray, C. Frey, S. K. Kolli y T. M. Pollock. "Design of Nickel-Cobalt-Ruthenium multi-principal element alloys". Acta Materialia 194 (agosto de 2020): 224–35. http://dx.doi.org/10.1016/j.actamat.2020.05.003.

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Kirschner, Johannes, Christoph Eisenmenger-Sittner, Johannes Bernardi, Alexander Großalber, Simon Frank y Clemens Simson. "Structural Changes in Multi Principal Element Alloys in Dependence on the Aluminium Content". Materials Science Forum 1016 (enero de 2021): 691–96. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.691.

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The development of novel light metal alloys represents an important task in the further optimization of technical materials. Multi-component systems with more than 4 metals are very promising to outperform currently existing alloys, but lack significant research in systems not dominated by transition metals to date. In this work, alloys containing the elements Al, Cu, Mg and Zn were produced using magnetron sputter deposition. A detailed structural investigation using electron microscopy provided valuable insights into the influences of different metals and their relative proportions in the alloy on material properties.

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Liu, Li, Ramesh Paudel, Yong Liu y Jing-Chuan Zhu. "Theoretical Study on Structural Stability and Elastic Properties of Fe25Cr25Ni25TixAl(25-x) Multi-Principal Element Alloys". Materials 14, n.º 4 (22 de febrero de 2021): 1040. http://dx.doi.org/10.3390/ma14041040.

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Material genetic engineering studies the relationship between the composition, microstructure, and properties of materials. By adjusting the atomic composition, structure, or configuration of the material and combining different processes, new materials with target properties obtained. In this paper, the design, and properties of the ordered phases in Fe25Cr25Ni25TixAl(25-x) (subscript represents the atomic percentage) multi-principal element alloys are studied. By adjusting the percentages of Ti and Al atoms, the effect of the atomic percentage content on ordered phases’ structural stability in multi-principal element alloys are studied. Thermodynamic analysis predicted the composition phase and percentage of the alloy. Formation heat, binding energy, and elastic constants confirmed the structural stability and provide a theoretical basis for designing alloys with target properties. The results showed that the disordered BCC A2 phase and the ordered BCC B2 phase are the ductile phases, while the Laves phase is brittle. The research method in this paper is used to design multi-principal element alloys or other various complex materials that meet the target performance.

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Choudhury, Amitava, Tanmay Konnur, P. P. Chattopadhyay y Snehanshu Pal. "Structure prediction of multi-principal element alloys using ensemble learning". Engineering Computations 37, n.º 3 (21 de noviembre de 2019): 1003–22. http://dx.doi.org/10.1108/ec-04-2019-0151.

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Purpose The purpose of this paper, is to predict the various phases and crystal structure from multi-component alloys. Nowadays, the concept and strategies of the development of multi-principal element alloys (MPEAs) significantly increase the count of the potential candidate of alloy systems, which demand proper screening of large number of alloy systems based on the nature of their phase and structure. Experimentally obtained data linking elemental properties and their resulting phases for MPEAs is profused; hence, there is a strong scope for categorization/classification of MPEAs based on structural features of the resultant phase along with distinctive connections between elemental properties and phases. Design/methodology/approach In this paper, several machine-learning algorithms have been used to recognize the underlying data pattern using data sets to design MPEAs and classify them based on structural features of their resultant phase such as single-phase solid solution, amorphous and intermetallic compounds. Further classification of MPEAs having single-phase solid solution is performed based on crystal structure using an ensemble-based machine-learning algorithm known as random-forest algorithm. Findings The model developed by implementing random-forest algorithm has resulted in an accuracy of 91 per cent for phase prediction and 93 per cent for crystal structure prediction for single-phase solid solution class of MPEAs. Five input parameters are used in the prediction model namely, valence electron concentration, difference in the pauling negativeness, atomic size difference, mixing enthalpy and mixing entropy. It has been found that the valence electron concentration is the most important feature with respect to prediction of phases. To avoid overfitting problem, fivefold cross-validation has been performed. To understand the comparative performance, different algorithms such as K-nearest Neighbor, support vector machine, logistic regression, naïve-based approach, decision tree and neural network have been used in the data set. Originality/value In this paper, the authors described the phase selection and crystal structure prediction mechanism in MPEA data set and have achieved better accuracy using machine learning.

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Tesis sobre el tema "Multi-Element alloys"

Mridha, Sanghita. "Structure Evolution and Nano-Mechanical Behavior of Bulk Metallic Glasses and Multi-Principal Element Alloys". Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984260/.

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Bulk metallic glasses and multi-principal element alloys represent relatively new classes of multi-component engineering materials designed for satisfying multiple functionalities simultaneously. Correlating the microstructure with mechanical behavior (at the microstructural length-scales) in these materials is key to understanding their performance. In this study, the structure evolution and nano-mechanical behavior of these two classes of materials was investigated with the objective of fundamental scientific understanding of their properties. The structure evolution, high temperature nano-mechanical behavior, and creep of two Zr-based alloys was studied: Zr41.2Ti13.8Cu12.5Ni10.0Be22 (Vitreloy1) and Zr52.5Ti5Cu17.9Ni14.6All0 (Vitreloy105). Devitrification was found to proceed via the formation of a metastable icosahedral phase with five-fold symmetry. The deformation mechanism changes from inhomogeneous or serrated flow to homogenous flow near 0.9Tg, where Tg is the glass transition temperature. The creep activation energy for Vitreloy1 and Vitreloy105 were 144 kJ/mol and 125 kJ/mol, respectively in the range of room temperature to 0.75Tg. The apparent activation energy increased drastically to 192 kJ/mol for Vitreloy1 and 215 kJ/mol for Vitreloy105 in the range of 0.9Tg to Tg, indicating a change in creep mechanism. Structure evolution in catalytic amorphous alloys, Pt57.5Cu14.7Ni5.3P22.5 and Pd43Cu27Ni10P20, was studied using 3D atom probe tomography and elemental segregation between different phases and the interface characteristics were identified. The structure evolution of three multi-principal element alloys were investigated namely CoCrNi, CoCrFeMnNi, and Al0.1CoCrFeNi. All three alloys formed a single-phase FCC structure in as-cast, cold worked and recrystallized state. No secondary phases precipitated after prolonged heat treatment or mechanical working. The multi-principal element alloys showed less strain gradient plasticity compared to pure metals like Ni during nano-indentation. This was attributed to the highly distorted lattice which resulted in lesser density of geometrically necessary dislocations (GNDs). Dislocation nucleation was studied by low load indentation along with the evaluation of activation volume and activation energy. This was done using a statistical approach of analyzing the "pop-in" load marking incipient plasticity. The strain rate sensitivity of nanocrystalline Al0.1CoCrFeNi alloy was determined by in situ compression of nano-pillars in a Pico-indenter. The nanocrystalline alloy demonstrated a yield strength of ~ 2.4 GPa, ten times greater than its coarse grained counterpart. The nanocrystalline alloy exhibited high strain rate sensitivity index of 0.043 and activation volume of 5b3 suggesting grain boundary dislocation nucleation.

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Bryant, Nathan J. "EXPERIMENTAL VALIDATION OF THE CALPHAD APPROACH APPLIED TO MULTI-PRINCIPLE ELEMENT ALLOYS". Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1433176902.

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O'Donnell, Martin. "Finite element modelling of a multi-stage stretch-forming operation using aerospace alloys". Thesis, University of Ulster, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270463.

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Akbari, Azin. "COMBINATORIAL SCREENING APPROACH IN DEVELOPING NON-EQUIATOMIC HIGH ENTROPY ALLOYS". UKnowledge, 2018. https://uknowledge.uky.edu/cme_etds/87.

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High entropy alloys (HEA) are a relatively new group of alloys first introduced in 2004. They usually contain 5 to 6 different principle elements. Each of these elements comprise 5-35 at. % of the chemical composition of the alloy. There is a growing interest in the research community about the development of these alloys as well as their engineering applications. Some HEAs have interesting properties that have made them well suited for higher temperature applications, particularly refractory uses, while some have been shown to maintain their mechanical properties even at cryogenic temperatures. Initially, the HEA research was focused on developing alloys with equiatomic compositions as it was believed that the single phase HEA would only form at such composition ratios. However, further research have found multiple HEAs with non-equiatomic chemical compositions. A major question that needs to be answered at this point is how to identify these non-equiatomic single phase alloy systems. Unlike the conventional alloys, the HEAs do not have a base element as a solvent, which complicates the identification of new alloy systems via conventional development techniques. To find a potential HEA, alloy development techniques of both exploratory and computational natures are being conducted within the community. Even though multiple HEAs have been successfully identified and fabricated by these techniques, in most cases they require extensive experimental data and are relatively time consuming and expensive. This study proposes a thin film combinatorial approach as a more efficient experimental method in developing new HEA alloy systems. In order to study HEA systems with different crystal structures, nominal HEA compositions were selected, including: CoFeMnNiCu in order to achieve face centered cubic (FCC) HEA, OsRuWMoRe to obtain hexagonal closed packed (HCP) and VNbMoTaW in an attempt to form a body centered cubic (BCC) crystal structure. Thin film samples were fabricated by simultaneous magnetron sputtering of the elements onto silicon wafer substrates. The arrangement of the sputtering targets yielded a chemical composition gradient in the films which ultimately resulted in the formation of various phases. Some of these phases exhibited the desired single-phase HEA, albeit with non-equiatomic chemical compositions. Bulk samples of the identified HEA compositions were prepared by arc melting mixtures of the metals. Microstructure of both thin film samples and bulk samples were characterized via scanning electron microscopy (SEM), focused ion beam (FIB) and energy dispersive x-ray spectroscopy (EDX). The crystal structures of the samples were studied by X-ray diffraction (XRD) and electron backscattered diffraction (EBSD) technique. Applying nano-indentation technique, the mechanical properties of some of the samples were screened over the composition gradient as well. By applying this combinatorial thin film approach, single-phase FCC, HCP and BCC HEAs were detected and successfully produced in bulk form. Additionally, screening the properties of the compositionally gradient thin films, as well as their chemical composition and crystal structure, provided a thorough understanding of the phase space. This experimental approach proved to be more efficient in identifying new alloy systems than conventional exploratory development methods.

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Slone, Connor. "Influence of composition and processing on the mechanical response of multi-principal element alloys containing Ni, Cr, and Co". The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555522223986934.

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Paquet, Daniel. "Adaptive Multi-level Model for Multi-scale Ductile Fracture Analysis in Heterogeneous Aluminum Alloys". The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1324565883.

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Tedjaseputra, Erik Nugroho. "Numerical Simulations of Microstructure-based Crystal Plasticity Finite Element Model for Titanium and Nickel Alloys". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1325084673.

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Marcus, Kylia. "Alliages multi-élémentaires comme matériaux innovants pour le stockage solide de l’hydrogène". Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI115.

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Les alliages à éléments principaux multiples (MPEA) constituent une nouvelle catégorie d'alliages intéressante pour le stockage de l'hydrogène. Contrairement à un alliage conventionnel dans lequel 1 ou 2 éléments sont ajoutés en petite quantité à un élément à forte concentration, ici au moins 4 éléments sont mélangés dans des proportions quasi égales. Selon les compositions, l'augmentation de l'entropie de mélange peut permettre la formation d'une solution solide monophasée (de structure cubique ou hexagonale principalement). La pression d'équilibre est généralement inférieure à 1 bar, ce qui signifie que l'hydrure présente une grande stabilité thermodynamique. Cette faible valeur de la pression d'équilibre ne convient pas aux applications de stockage, car la réaction de déshydruration nécessite une quantité d'énergie conséquente pour se produire. Dans le but d'améliorer le premier plateau de pression d'équilibre, de nouvelles compositions sont conçues sur la base de la classification de type AB, avec A un élément formant un hydrure stable et B un élément formant un hydrure instable. Cette thèse porte sur la synthèse, les études microstructurales et structurales et des propriétés de sorption d'alliages à quatre éléments, principalement des éléments de transition
Multiple principal element alloys (MPEAs) are an interesting new class of alloys for hydrogen storage. Unlike a conventional alloy in which 1 or 2 elements are added in small quantities to a high-concentration element, here at least 4 elements are mixed in almost equal proportions. Depending on the composition, the increase in mixing entropy can lead to the formation of a single-phase solid solution (mainly cubic or hexagonal in structure). Equilibrium pressure is generally less than 1 bar, which means that the hydride is thermodynamically stable. This low equilibrium pressure is not suitable for storage applications, as the dehydridation reaction requires a significant amount of energy to occur. In order to improve the first equilibrium pressure plateau, new compositions are designed on the basis of the AB type classification, with A a stable hydride-forming element and B an unstable hydride-forming element. This thesis deals with the synthesis, microstructural and structural studies and sorption properties of four-element alloys, mainly transition elements

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Xu, Rui. "Multiscale modeling of heterogeneous materials : application to Shape Memory Alloys". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0066.

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L’objectif principal de cette thèse est de développer des techniques de modélisation et de simulation multi-échelles avancées et efficaces pour les matériaux architecturés et composites à base d’Alliages à Mémoire de Forme (AMF). À cette fin, un modèle générique 3D multi-échelles pour les AMF architecturés est implémenté dans ABAQUS, où un modèle thermodynamique, proposé par Chemisky et al. [1], est adopté pour décrire le comportement constitutif local de l’AMF, et la méthode des éléments finis multi-échelles (EF2) pour réaliser l’interaction en temps réel entre le niveau microscopique et le niveau macroscopique. L’instabilité élastique des fibres au niveau microscopique est également étudiée efficacement dans ce cadre en introduisant la Méthode Asymptotique Numérique (MAN) et la Technique des Coefficients de Fourier à Variation Lente (TCFVL). Pour améliorer l’efficacité du calcul de l’approche simultanée à plusieurs échelles, dans laquelle d’énormes problèmes microscopiques sont résolus en ligne pour mettre à jour les contraintes macroscopiques, des méthodes de calcul multi-échelles basées sur les données sont proposées pour les structures composites. En découplant les échelles corrélées dans le cadre FE2, les problèmes microscopiques sont résolus hors ligne, tandis que le coût du calcul macroscopique en ligne est considérablement réduit. De plus, en formulant le schéma data-driven en contrainte et déformation généralisées, le calcul par la technique Structural-Genome-Driven est développé pour les structures composites à parois minces
The main aim of this thesis is to develop advanced and efficient multiscale modeling and simulation techniques for Shape Memory Alloys (SMAs) composite and architected materials. Towards this end, a 3D generic multiscale model for architected SMAs is implemented in ABAQUS, where a thermodynamic model, proposed by Chemisky et al. [1], is adopted to describe the local constitutive behavior of the SMA, and the multiscale finite element method (FE2) to realize the real-time interaction between the microscopic and macroscopic levels. Microscopic fiber instability is also efficiently investigated in this framework by introducing the Asymptotic Numerical Method (ANM) and the Technique of Slowly Variable Fourier Coefficients (TSVFC). To improve the computational efficiency of the concurrent mulitscale approach, in which tremendous microscopic problems are solved online to update macroscopic stress, data-driven multiscale computing methods are proposed for composite structures. Decoupling the correlated scales in concurrent FE2 framework, microscopic problems are solved offline, while the online macroscopic computational cost is significantly reduced. Further, by formulating the data-driven scheme in generalized stress and strain, Structural-Genome-Driven computing is developed for thin-walled composite structures

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Zhang, Gongwang. "THE FORMATION MECHANISM OF α-PHASE DISPERSOIDS AND QUANTIFICATION OF FATIGUE CRACK INITIATION BY EXPERIMENTS AND THEORETICAL MODELING IN MODIFIED AA6061 (AL-MG-SI-CU) ALLOYS". UKnowledge, 2018. https://uknowledge.uky.edu/cme_etds/90.

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AA6061 Al alloys modified with addition of Mn, Cr and Cu were homogenized at temperatures between 350 ºC and 550 ºC after casting. STEM experiments revealed that the formation of α-Al(MnFeCr)Si dispersoids during homogenization were strongly affected by various factors such as heating rate, concentration of Mn, low temperature pre-nucleation treatment and homogenization temperature. Through analysis of the STEM results using an image software Image-Pro, the size distributions and number densities of the dispersoids formed during different annealing treatments were quantitatively measured. It was revealed that increasing the heating rate or homogenization temperature led to a reduction of the number density and an increase in size of the dispersoids. The number density of dispersoids could be markedly increased through a low temperature pre-nucleation treatment. A higher Mn level resulted in the larger number density, equivalent size and length/width ratio of the dispersoids in the alloy. Upsetting tests on two of these Mn and Cr-containing AA6061 (Al-Mg-Si-Cu) Al alloys with distinctive Mn contents were carried out at a speed of 15 mm s-1 under upsetting temperature of 450 ºC after casting and subsequent homogenization heat treatment using a 300-Tone hydraulic press. STEM experiments revealed that the finely distributed α-Al(MnFeCr)Si dispersoids formed during homogenization showed a strong pinning effect on dislocations and grain boundaries, which could effectively inhibit recovery and recrystallization during hot deformation in the two alloys. The fractions of recrystallization after hot deformation and following solution heat treatment were measured in the two alloys with EBSD. It was found that the recrystallization fractions of the two alloys were less than 30%. This implied that the finely distributed α-dispersoids were rather stable against coarsening and they stabilized the microstructure by inhibiting recovery and recrystallization by pinning dislocations during deformation and annealing at elevated temperatures. By increasing the content of Mn, the effect of retardation on recrystallization were further enhanced due to the formation of higher number density of the dispersoids. STEM and 3-D atom probe tomography experiments revealed that α-Al(MnFeCr)Si dispersoids were formed upon dissolution of lathe-shaped Q-AlMgSiCu phase during homogenization of the modified AA6061 Al alloy. It was, for the first time, observed that Mn segregated at the Q-phase/matrix interfaces in Mn-rich regions in the early stage of homogenization, triggering the transformation of Q-phase into strings of Mn-rich dispersoids afterwards. Meanwhile, in Mn-depleted regions the Q-phase remained unchanged without segregation of Mn at the Q-phase/matrix interfaces. Upon completion of α-phase transformation, the atomic ratio of Mn and Si was found to be 1:1 in the α-phase. The strengthening mechanisms in the alloy were also quantitatively interpreted, based on the measurements of chemical compositions, dispersoids density and size, alloy hardness and resistivity as a function of the annealing temperature. This study clarified the previous confusion about the formation mechanism of α-dispersoids in 6xxx series Al alloys. Four-point bend fatigue tests on two modified AA6061 Al alloys with different Si contents (0.80 and 1.24 wt%, respectively) were carried out at room temperature, f = 20 Hz, R = 0.1, and in ambient air. The stress-number of cycles to failure (S-N) curves of the two alloys were characterized. The alloys were solution heat treated, quenched in water, and peak aged. Optical microscopy and scanning electron microscopy were employed to capture a detailed view of the fatigue crack initiation behaviors of the alloys. Fatigue limits of the two alloys with the Si contents of 0.80 and 1.24 wt% were measured to be approximately 224 and 283.5 MPa, respectively. The number of cracks found on surface was very small (1~3) and barely increased with the applied stress, when the applied stress was below the yield strength. However, it was increased sharply with increase of the applied stress to approximately the ultimate tensile strength. Fatigue crack initiation was predominantly associated with the micro-pores in the alloys. SEM examination of the fracture surfaces of the fatigued samples showed that the crack initiation pores were always aspheric in shape with the larger dimension in depth from the sample surface. These tunnel-shaped pores might be formed along grain boundaries during solidification or due to overheating of the Si-containing particles during homogenization. A quantitative model, which took into account the 3-D effects of pores on the local stress/strain fields in surface, was applied to quantification of the fatigue crack population in a modified AA6061 Al alloy under cyclic loading. The pores used in the model were spherical in shape, for simplicity, with the same size of 7 μm in diameter. The total volume fraction of the pores in the model were same as the area fraction of the pores measured experimentally in the alloy. The stress and strain fields around each pore near the randomly selected surface in a reconstructed digital pore structure of the alloy were quantified as a function of pore position in depth from the surface using a 3-D finite element model under different stress levels. A micro-scale Manson-Coffin equation was used to estimate the fatigue crack incubation life at each of the pores in the surface and subsurface. The population of fatigue cracks initiated at an applied cyclic loading could be subsequently quantified. The simulated results were consistent with those experimentally measured, when the applied maximum cyclic stress was below the yield strength, but the model could not capture the sudden increase in crack population at UTS, as observed in the alloy. This discrepancy in crack population was likely to be due to the use of the spherical pores in the model, as these simplified pores could not show the effects of pore shape and their orientations on crack initiation at the pores near surface. Although it is presently very time-consuming to calculate the crack population as a function of pore size and shape in the alloy with the current model, it would still be desirable to incorporate the effects of shape and orientation of the tunnel-shaped pores into the model, in the future, in order to simulate the fatigue crack initiation more accurately in the alloy.

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Libros sobre el tema "Multi-Element alloys"

O'Donnell, Martin. Finite element modelling of a multi-stage stretch-forming operation using aerospace alloys. [S.l: The author], 2003.

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Capítulos de libros sobre el tema "Multi-Element alloys"

Barton, G., X. Li y Gerhard Hirt. "Finite-Element Modeling of Multi-Pass Forging of Nickel-Base Alloys Using a Multi-Mesh Method". En THERMEC 2006, 2503–8. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-428-6.2503.

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Han, Linge, Hui Jiang, Dongxu Qiao, Yiping Lu y Tongmin Wang. "Effects of Iron on Microstructure and Properties of CoCrFexNi Multi-principal Element Alloys". En Advanced Functional Materials, 253–58. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0110-0_28.

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Chau, Nguyen Hai, Masatoshi Kubo, Le Viet Hai y Tomoyuki Yamamoto. "Phase Prediction of Multi-principal Element Alloys Using Support Vector Machine and Bayesian Optimization". En Intelligent Information and Database Systems, 155–67. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73280-6_13.

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Beniwal, Dishant, Jhalak y Pratik K. Ray. "Data-Driven Phase Selection, Property Prediction and Force-Field Development in Multi-Principal Element Alloys". En Forcefields for Atomistic-Scale Simulations: Materials and Applications, 315–47. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3092-8_16.

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Jayaraman, Tanjore V. y Ramachandra Canumalla. "Data-driven Search and Selection of Ti-containing Multi-principal Element Alloys for Aeroengine Parts". En The Minerals, Metals & Materials Series, 501–16. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-22524-6_45.

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Großmann, Christian, Andreas Schäfer y Martin F. X. Wagner. "Finite Element Simulation of Localized Phase Transformations in Pseudoelastic NiTi Shape Memory Alloys Subjected to Multi-Axial Stress States". En ICOMAT, 525–30. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118803592.ch76.

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Sadeghpour, S., S. M. Abbasi y M. Morakabati. "Design of a New Multi-element Beta Titanium Alloy Based on d-Electron Method". En TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings, 377–86. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72526-0_36.

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Ostaszewska-Liżewska, Anna y Jan Klimaszewski. "Finite Element Method Based Toolchain for Simulation of Proximity Estimation Using Electronic Skin". En Digital Interaction and Machine Intelligence, 250–59. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-37649-8_25.

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AbstractThe emergence of new areas of human-robot cooperation creates the need to ensure human safety in this regard. Therefore, there is a need to develop new sensors to detect the presence of a human in the vicinity of a robot. One such sensor is an electronic skin (e-skin). Manufacturing and testing new e-skin prototypes is labor-intensive. This paper presents a software toolchain developed to simulate the operation of an e-skin used to detect human proximity. The toolchain is based on the finite element method and has been developed exclusively with free and open-source software. The presented toolchain makes it possible to test e-skin modifications without the need for a physical prototype and significantly reduces implementation costs. The developed solution is multi-platform and allows parallel and multi-threaded calculations conducted on multiple machines simultaneously. This paper presents modeling results obtained for a simplified e-skin sensor, which are consistent with experimental results on the actual model.

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Li, Xiangyue, Xiaojing Liu, Xiang Chai y Tengfei Zhang. "Preliminary Multi-physics Coupled Simulation of Small Helium-Xenon Cooled Mobile Nuclear Reactor". En Springer Proceedings in Physics, 690–702. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_59.

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AbstractFor the prediction of the internal physical process of SIMONS (Small Innovative helium-xenon cooled MObile Nuclear power Systems), this research created a coupled three-dimensional high-fidelity calculation platform of the neutronics/ thermo-elasticity analysis called FEMAS (FEM based Multi-physics Analysis Software for Nuclear Reactor). This platform allows for the multi-physics coupling calculations of neutron diffusion/ transport, thermal diffusion, and thermal elasticity. It is based on the open-source Monte Carlo code OpenMC and the open-source finite element codes Dealii and Fenics. In this paper, a simplified SIMONS reactor core is analyzed using the coupling platform. The results demonstrate that the coupling platform is capable of accurately predicting the effective multiplication factor change curve, power and temperature distribution, and thermal expansion phenomenon of SIMONS. With 240 kW of thermal power, the local temperature difference of the whole reactor is 390.1 K, and thermal stress-related deformation occurs at a rate of 2.4%. The reactivity feedback caused by the monolith’s heating and thermal expansion is 30.5 pcm. Leveraging the high-precision computing hardware, this platform can assess the core performance to ensure that the core design satisfies the design criteria of ultra-long life and inherent safety.

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Sharma, Prince, Nushrat Naushin, Sahil Rohila y Abhishek Tiwari. "Magnesium containing High Entropy Alloys". En Magnesium Alloys Structure and Properties [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98557.

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High Entropy alloys (HEAs) or Complex Concentrated Alloys (CCAs) or Multi-Principal Element Alloys (MPEAs) is a matter of interest to material scientists for the last two decades due to the excellent mechanical properties, oxidation and corrosion resistant behaviors. One of the major drawbacks of HEAs is their high density. Mg containing HEAs show low density compared to peers, although extensive research is required in this field. This chapter aims to include all the available information on synthesis, design, microstructures and mechanical properties of Mg containing HEAs and to highlight the contemporary voids that are to be filled in near future.

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Actas de conferencias sobre el tema "Multi-Element alloys"

Scully, John. "Corrosion and passivation of multi-principal element alloys in aqueous solutions". En 1st Corrosion and Materials Degradation Web Conference. Basel, Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/cmdwc2021-09921.

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Valsecchi, Giorgio, Elena Colombini, Magdalena Lassinantti Gualtieri, Cecilia Mortalò, Silvia Deambrosis, Francesco Montagner, Valentina Zin, Enrico Miorin, Monica Fabrizio y Paolo Veronesi. "Synthesis of Multi-Principal Element Alloys by a Conventional Powder Metallurgy Process". En Euro Powder Metallurgy 2023 Congress & Exhibition. EPMA, 2023. http://dx.doi.org/10.59499/ep235762930.

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The development of tailored microstructures of Multi-principal element alloys (MPEAs) is currently a hot topic in physical metallurgy. The most targeted systems are equimolar alloys composed of 3d transition metals including the so-called Cantor alloy (i.e. CoCrFeMnNi) and derivatives such as CoCrFeNi and CoCrFeNiAlx. Powder metallurgy is a promising route for this purpose and include manufacturing techniques such as hot pressing of mechanically activated or prealloyed powders or the less popular press-sinter route of mixed powders. In this work, cold pressing followed by fast vacuum sintering (1h) at various temperatures (Tmax =1100-1300 °C) of mixed powders of CoCrFeNi and CoCrFeNiAl0.4 were explored for the synthesis of structurally and chemically homogeneous alloys. This approach is promising for the synthesis of bulk alloys of higher purity with respect to hot pressing of mechanically prealloyed powders. Microstructural investigations were performed by X-ray Powder diffraction (XRPD) and Scanning electron microscopy (SEM). It will be shown that the reactive sintering kinetics of the investigated systems require a Tmax of 1200 °C for effective alloying at the short holding time employed for CoCrFeNi. Instead, 1300 °C is needed for CoCrFeNiAl0.4.

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Aksoy, Doruk, Megan McCarthy, Ian Geiger y Timothy Rupert. "Local and Near-Boundary Environments in NbMoTaW Refractory Multi-Principal Element Alloy." En Proposed for presentation at the 2nd World Congress on High Entropy Alloys (HEA 2021) held December 5-8, 2021 in Charlotte, North Carolina. US DOE, 2021. http://dx.doi.org/10.2172/1905965.

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Birbilis, Nick, Sanjay Choudhary y Sebastian Thomas. "On the corrosion and passivation of lightweight Al-based multi-principal element alloys (MPEAs)". En 1st Corrosion and Materials Degradation Web Conference. Basel, Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/cmdwc2021-09919.

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Paredes, Marcelo. "High Entropy Alloys as a New Alternative to Corrosion-Resistant Alloys For Marine Applications". En SNAME 28th Offshore Symposium. SNAME, 2023. http://dx.doi.org/10.5957/tos-2023-020.

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A recent paradigm shift in physical metallurgy has enabled the exploration of multi-principal element alloys (MPEAs) or high entropy alloys (HEAs) with as-yet-unknown superior properties which have turned attractive to various engineering applications and industry sectors. In particular, the O&G industry, on daily basis, faces technical challenges to overcome the deleterious effects of corrosion processes affecting critical infrastructure such as pipeline networks, refineries, subsea equipment, etc. The purpose of this work is to briefly review some key aspects of this new type of material as an alternative to the existing conventional alloys widely used by the shipbuilding and energy industries including the O&G sector. The review begins with some generalities about the future tendency of the steel-consuming industry and the growing dependency on metallic alloys despite the rising of emerging technologies in the area of manufacturing and smart materials which seek to be substitute goods. Then, a short summary of corrosion processes and some protection methods used by the industry are discussed. Finally, a succinct comparative analysis between HEAs and conventional steel alloys is carried out by highlighting the pros and cons of these latest technological advances in corrosion-resistant alloy development based on the multi-principal element alloy principle.

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Frankel, Gerald, Christopher Taylor, Yehia Khalifa y Anup Panindre. "Corrosion of single-phase Ni-Fe-Cr-Mo-W-X non-equimolar multi-principal element alloys". En 1st Corrosion and Materials Degradation Web Conference. Basel, Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/cmdwc2021-09922.

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Kashiwagi, Sayuki, Yoshihiro Tomita, Toshihiko Yamaguchi, Koji Yamamoto, Yusuke Morita y Eiji Nakamachi. "Development of Multi-Scale Thermo-Crystal Plasticity Finite Element Method to Analyze Plastic Deformation of Magnesium Alloy". En ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71151.

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To clarify the deformation induced crystal texture evolution of rolled and drawn magnesium alloy sheets with strong basal texture, we developed a multi-scale finite element (FE) analysis code based on the homogenization theory, which combines the microscopic poly-crystal structure and the macroscopic continuum. In our crystal plasticity constitutive equation of magnesium alloys, the plastic work induced temperature rise and twinning in the crystal slip systems was implemented into our multi-scale FE analysis code. To validate our numerical code to correctly predict macro and micro deformations including the crystal texture evolution, the tension and compression along normal direction (ND) and rolling direction (RD) at the room temperature 300K and the high temperature 673K were numerically investigated. It is confirmed that numerical results showed the similar tendency to experimentally obtained results including the strengthening the basal texuture in compression along ND, the twinning, the polarity of twinning and the temperature-dependency that twinning is hardly appear at high temperature. Finaly, we concluded that our numerical code can predict the plastic strain induced texture evolution of magnesium alloys.

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Xu, Jinkai, Kui Xia, Linshuai Zhang, Zhanjiang Yu y Huadong Yu. "The surface element deposition and corrosion behavior study of multi-cutting in the machining of magnesium alloys". En 2015 2nd International Workshop on Materials Engineering and Computer Sciences. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/iwmecs-15.2015.57.

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Huang, Boling, Xuan Wang, Yong Zhu, Tingting Yang, Lansen Li, Simeng Li, Xihan Yang et al. "Evaluation and analysis of collaborative experiment for determination of multi-element contents in gold adornment alloys by LA-ICP-MS". En Second International Conference on Digital Society and Intelligent Systems (DSInS 2022), editado por Jie Hu y Xin Yang. SPIE, 2023. http://dx.doi.org/10.1117/12.2673359.

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Han, Junsoo, Pin Lu, James Saal, Gerald Frankel, Kevin Ogle y John Scully. "Refining anodic and cathodic dissolution mechanisms of the multi-principal element alloys using atomic emission spectroelectrochemistry coupled with electrochemical impedance spectroscopy". En 1st Corrosion and Materials Degradation Web Conference. Basel, Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/cmdwc2021-09920.

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Informes sobre el tema "Multi-Element alloys"

Sharma, Aayush. Multi-principal element alloys: Design, properties and heuristic explorations. Office of Scientific and Technical Information (OSTI), noviembre de 2019. http://dx.doi.org/10.2172/1593312.

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The NITON{reg_sign} XL-800 Series Multi-Element Spectrum Analyzer (Alloy Analyzer). Innovative Technology Summary Report. Office of Scientific and Technical Information (OSTI), abril de 2000. http://dx.doi.org/10.2172/769190.

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