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Dissertations / Theses on the topic 'Multi principal element alloys'

Author: Grafiati

Published: 6 September 2023

Last updated: 25 July 2025

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1

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-m

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2

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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3

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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4

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 temperature

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5

Mourgout, Adrien. "Développement par fabrication additive sur lit de poudre d’alliages biocompatibles à éléments principaux multiples (Ti41.2Nb29.4Zr29.4)(1-x)MoxTax : optimisation microstructurale et propriétés." Electronic Thesis or Diss., Paris 13, 2025. http://www.theses.fr/2025PA131003.

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Dans le contexte mondial du vieillissement de la population et du besoin croissant d'implants, le développement de solutions matériau répondant à la fois à des critères stricts de biocompatibilité et de performances mécaniques est crucial. Pour répondre à ces défis, une nouvelle famille d'alliages a été développée, combinant deux concepts métallurgiques : la fabrication additive, avec notamment la fusion laser sur lit de poudre (L-PBF), ainsi que les alliages biocompatibles à éléments principaux multiples (MPEA). C'est donc dans cette idée d'innovation et de progrès que ce travail de recherche

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6

Jha, Rajesh. "Combined Computational-Experimental Design of High-Temperature, High-Intensity Permanent Magnetic Alloys with Minimal Addition of Rare-Earth Elements." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2621.

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AlNiCo magnets are known for high-temperature stability and superior corrosion resistance and have been widely used for various applications. Reported magnetic energy density ((BH) max) for these magnets is around 10 MGOe. Theoretical calculations show that ((BH) max) of 20 MGOe is achievable which will be helpful in covering the gap between AlNiCo and Rare-Earth Elements (REE) based magnets. An extended family of AlNiCo alloys was studied in this dissertation that consists of eight elements, and hence it is important to determine composition-property relationship between each of the alloying

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7

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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8

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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9

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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10

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

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11

Bunnell, Spencer Reese. "Real Time Design Space Exploration of Static and Vibratory Structural Responses in Turbomachinery Through Surrogate Modeling with Principal Components." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8451.

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Design space exploration (DSE) is used to improve and understand engineering designs. Such designs must meet objectives and structural requirements. Design improvement is non-trivial and requires new DSE methods. Turbomachinery manufacturers must continue to improve existing engines to keep up with global demand. Two challenges of turbomachinery DSE are: the time required to evaluate designs, and knowing which designs to evaluate. This research addressed these challenges by developing novel surrogate and principal component analysis (PCA) based DSE methods. Node and PCA-based surrogates were c

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12

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 n

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13

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 w

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14

Wan, Chuangeng. "Étude de la liaison métal-alumine élaborée par voies liquide et solide : mouillage, thermocompression." Grenoble INPG, 1992. http://www.theses.fr/1992INPG0023.

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La premiere partie de cette etude a ete consacree a la conception de deux nouveaux alliages de brasure de l'alumine en visant des caracteristiques optimales pour l'utilisateur. L'essentiel du travail a consiste en une etude des proprietes de mouillage, realisee par la methode de la goutte posee sous vide pousse, avec les deux alliages cupdti et nifecrsiti sur substrats mono et polycristallins d'alumine. Les interfaces et les produits de reaction ont ete caracterises par rugosimetrie, microscopie electronique a balayage et micro-analyse, et les resultats discutes a l'aide d'arguments thermodyna

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15

Milhet, Gayraud Nathalie. "Étude expérimentale et modélisation de la précipitation [gamma]' dans le superalliage N18." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0035.

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Les excellentes proprietes mecaniques des superalliages leurs sont conferees par la precipitation de la phase gamma prime issue des divers traitements thermiques. L'etape de trempe qui succede a l'elaboration par metallurgie des poudres des disques de turboreacteur en superalliage a base de nickel, conditionne fortement l'etat mecanique et microstructural final du materiau. L'objectif de ce travail est de developper et de valider un modele qui decrit la cinetique de precipitation de la phase gamma prime afin d'optimiser la microstructure resultant de cette trempe. Une serie de demarches experi

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16

Chen, Xue, Ziad Moumni, and Yong Jun He. "Sur le comportement magnéto-mécanique des alliages à mémoire de forme magnétiques." Phd thesis, Ecole Polytechnique X, 2013. http://pastel.archives-ouvertes.fr/pastel-00848630.

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Les Alliages à Mémoire de Forme Magnétiques (AMFM) sont des matériaux actifs qui présentent des comportements inhabituels par rapport aux matériaux " classiques ". Ils peuvent par exemple présenter de larges déformations réversibles sous l'action d'un champ magnétique ou sous une action mécanique. Ce sont des candidats potentiels pour des applications dans des domaines de pointe (automobile, aéronautique, spatial, etc.). Les AMFM présentent par ailleurs un avantage indéniable par rapport aux matériaux à mémoire de forme " thermique " en raison de leur réponse dynamique à haute fréquence. Il es

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17

胡雅惠. "Evolution of microstructure and properties in Cu-Ni-Al-Co-Cr-Fe-Ti-Mo alloys with multi-principal elements during mechanical alloying." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/69744200954601490438.

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18

Dash, Anuj. "Solving The Unsolved In Multicomponent Diffusion: The Concept Of Constrained Diffusion Couple Methods." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6202.

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Quantitative diffusion analysis in multicomponent metallic systems has been a formidable task historically and despite decades of research, most of the diffusivity estimations were limited to interdiffusion and some intrinsic diffusion coefficients in binary systems and interdiffusion coefficients in a few ternary systems until recently. The experimental complications associated with the need to intersect (n-1) serpentine diffusion paths in the n dimensional space for determining the 〖(n-1)〗^2 interdiffusion coefficients lead to various approaches like average diffusivity, square root diffusiv

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19

Liu, Tsung-Han, and 劉宗翰. "Superconductivity in NbZrTi-bearing Multi-element Alloys." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/35rhqx.

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碩士<br>國立清華大學<br>材料科學工程學系<br>102<br>This study investigates the superconductivity of as-cast and as-heat-treated ternary to 6-element multi-component alloys (hereafter abbreviated as the alloys) that are made of non-equal molar Nb-Zr-Ti by addition of minor Hf, V, Ta and Ge. The alloys are principally single random BCC Nb-rich solid solutions. Difference in formation enthalpies between elements, especially for pairs with Ta and Ge, and the driving forces by heat treatments induce a Zr-bearing precipitation from the Nb-rich BCC phase to form a Zr(Ge)-rich phase. This results in a change of Nb/

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20

施經瑋. "A study of thermoelectric properties of multi-element alloys." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/ndx3up.

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碩士<br>國立清華大學<br>材料科學工程學系<br>92<br>A good thermoelectric material requires high Seebeck coefficient (S) and electrical conductivity (σ) but low thermal conductivity (κ), which are not common found in traditional metallic alloys. As compound with traditional metallic alloy, high entropy alloy of multi constituent element is a newly developed metallurgical concept. A variety of different forms of the multi-element alloys have been demonstrated to possess superior mechanical and chemical properties. However, the electrical and thermoelectric properties of the multi-element alloys have not been t

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21

Wu, Hung-Nan, and 吳皇南. "Effect of Sb doping on the thermoelectric properties of Ti0.5Zr0.5NiSn1-xSbx multi-element alloys." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/11047587805966150061.

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碩士<br>國立清華大學<br>材料科學工程學系<br>94<br>A effect of Sb doping (x=0~0.5) on the thermoelectric properties of annealed Ti0.5Zr0.5NiSn1-xSbx multi-element alloys is studied based on Ti0.5Zr0.5NiSn quaternary alloy with half-Heusler structure. The result shows both the absolute value of Seebeck coefficient and electrical resistivity decrease as the quantity of Sb doping increases at room temperature. The change of resistivity is marked for the alloy with slight Sb doping. The maximum power factor(S2/λ) is 2.83×10-3W/m-K2 for the annealed Ti0.5Zr0.5NiSn1-xSbx (x=0.005) alloy. It is three times larger tha

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