Дисертації з теми "Multi principal element alloys"
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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/.
Повний текст джерелаSlone, 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.
Повний текст джерелаBryant, 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.
Повний текст джерелаAkbari, Azin. "COMBINATORIAL SCREENING APPROACH IN DEVELOPING NON-EQUIATOMIC HIGH ENTROPY ALLOYS." UKnowledge, 2018. https://uknowledge.uky.edu/cme_etds/87.
Повний текст джерелаJha, 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.
Повний текст джерелаO'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.
Повний текст джерелаPaquet, 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.
Повний текст джерелаTedjaseputra, 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.
Повний текст джерелаBunnell, 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.
Повний текст джерелаXu, Rui. "Multiscale modeling of heterogeneous materials : application to Shape Memory Alloys." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0066.
Повний текст джерелаThe 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
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.
Повний текст джерелаMilhet, Gayraud Nathalie. "Étude expérimentale et modélisation de la précipitation [gamma]' dans le superalliage N18." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0035.
Повний текст джерелаChen, 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.
Повний текст джерела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.
Повний текст джерелаLiu, Tsung-Han, and 劉宗翰. "Superconductivity in NbZrTi-bearing Multi-element Alloys." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/35rhqx.
Повний текст джерела國立清華大學
材料科學工程學系
102
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/Zr ratio in the Nb-rich BCC phase, and thus affects the superconductivity of the alloys. The critical temperature of the alloys, Tc, ranges from 8 K to 11 K. The room-temperature resistivity of the as-cast alloys varies from 21 μΩ–cm to 35 μΩ–cm. Compared with the electrical resistivity of other multi-component ones, the alloys have a lower electrical resistivity. The residual resistivity ratio RRR value is from 1.2 to 1.3, which mentions that the resistivity is principally controlled by the impurity atoms in the alloys. If one simply emphasizes the e/a ratio from the content of Nb and Zr in the alloys, the Tc of the alloys approximately follows the Matthias empirical rule. However, factors affecting Tc, besides the e/a, include lattice distortion due to multiple element addition, and the characteristics of individual elements in the alloys. The alloys are typically type II superconductors. The upper critical magnetic field Hc2 is estimated to be in the range of 5 T to 9 T. At 2 K &; 5 T, the critical current density Jc has the value of approximately 105 A/cm2. This property has something to do with the precipitates and has yet nothing to do with the lattice distortion of the alloys.
施經瑋. "A study of thermoelectric properties of multi-element alloys." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/ndx3up.
Повний текст джерела國立清華大學
材料科學工程學系
92
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 thoroughly explored yet. In this study, multi-element alloys were prepared by arc-melting and thermal annealing. Their thermoelectric properties were characterized after appropriate sample preparation. We find two multi-element alloy systems based on half-Heusler structure:ZrTiSnSiNi2 and ZrTiSnGeNi2. The thermoelectric figure of merits (ZT , Z= S2/(ρ×κ)) of these multi-element alloys were equal to be 0.02 and 0.045, respectively, at room temperature. These multi-element alloys showed 3 times increase in power factor (S2/ρ) in the middle temperature range (250℃ to 300℃). By adding Nb element into the alloy forming Zr0.9Ti0.9Nb0.2SnSiNi2, the thermoelectric figure of merit was found to be 0.078 at room temperature. The multi- element alloys were identified to be a composite material containing semiconductor-like phase and metallic-like phase by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS).
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.
Повний текст джерела國立清華大學
材料科學工程學系
94
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 than that of Ti0.5Zr0.5NiSn which is 0.72×10-3W/m-K2. The maximum ZT value is about 0.16 for the Ti0.5Zr0.5NiSn1-xSbx (x=0.005) alloy at room temperature which is four times larger than that of Ti0.5Zr0.5NiSn. Therefore, the lightly Sb doping would dramatically improve the thermoelectric properties of the Ti0.5Zr0.5NiSn alloy system. Besides, the results of thermoelectric properties measurement at high temperature reveal that the absolute value of Seebeck coefficient increases as the temperature rises. The resistivity of Sb doped alloys increases with rising temperature, indicating that the Sb doping would promote the metallic transport properties. Consequently, a slight Sb doping (below 5at% substitution of Sn atoms)would enhance the thermoelectric properties of Ti0.5Zr0.5NiSn1-xSbx alloy system.