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Dissertations / Theses on the topic 'Amorphous metallic alloys'

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Published: 4 June 2021

Last updated: 7 February 2022

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1

Woldt, E. "Relaxation in metallic glasses." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382709.

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2

Drewery, J. S. "The electronic transport properties of amorphous metallic alloys." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233897.

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Amorphous metals have been studied extensively recently and possess many interesting electronic properties. This thesis aims to examine some of these, with particular reference to the conductivity and Hall effect in such alloys. In an extensive review of recent theoretical and experimental work, the author attempts to examine (i) whether the data can be explained using the 'semi-classical' theory of transport, with the inbuilt assumption that the electron loses memory of all collisions before that immediately preceding the time of observation, or whether 'quantum interference' and 'electron co

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3

Bhatti, A. R. "Effect of heat treatment on metallic glasses." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236306.

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4

Mackay, Kenneth Donald. "The low temperature electronic transport properties of amorphous metallic alloys." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386132.

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5

Al-Qadi, Khalid. "Temperature dependence of the electrical resistivity in amorphous metallic alloys." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9123.

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The purpose of this study is to investigate the conduction electrons' interaction mechanisms over the wide temperature range in order to find possible deviations from the existing theories. The temperature dependence of the electrical resistivity of two scattering systems, the crystalline and the amorphous, in the range of 1.7--300 K is studied. In the pure crystalline metals, the nearly-free-electron model can qualitatively and quantitatively account for the temperature dependence of the electrical resistivity. In the low-temperature range, the electron-electron scattering is the dominant sca

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6

Hasannaeimi, Vahid. "Nano-Manufacturing of Catalytic Amorphous Alloys." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1609096/.

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In this dissertation, nano-manufacturing of amorphous alloys for electro-catalytic applications is reported and the role of chemistry and active surface area on catalytic behavior is discussed. The catalytic activity of recently developed platinum and palladium-based metallic glasses was studied using cyclic voltammetry and localized electrochemical techniques. The synergistic effect between platinum and palladium was shown for amorphous alloys containing both these elements. The mechanism for superior catalytic behavior was investigated through electronic structure and surface chemical state

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7

Verduzco, Martinez Jorge A. "Study of the fatigue behaviour of some Fe-based metallic glass wires." Thesis, University of Sheffield, 2000. http://etheses.whiterose.ac.uk/10241/.

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Fe78_C.,r xSiioBj2 and Fe77S. xCr-,S i7S. Bjs (with x values ranging from 0 to 8) glassy metallic alloys have been produced in the form of both wires and ribbons using the rotating water bath melt spinning process and chill block melt spinning process, respectively. It was found that the Fe77.5C.,r,, ,S ii. 5B15s eries had better amorphousw ire forming ability than the Fe7g_XCrXSiloBs1e2ri es. However, in ribbon form, both series showed good castability as amorphous alloys. Selected mechanical properties of the glassy samples have been compared with those of high tensile steel wire. Both therm

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8

Zamani, Atieh. "Metallic Amorphous Thin Films and Heterostructures with Tunable Magnetic Properties." Doctoral thesis, Uppsala universitet, Materialfysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-239950.

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The primary focus of this thesis is to study the effect of doping on magnetic properties in amorphous Fe100−xZrx alloys. Samples with compositions of x = 7,11.6 and 12 at.% were implanted with different concentrations of H. Moreover, the samples with a composition of x = 7 at.% were also implanted with He, B, C and N. Magnetic measurements were performed, using SQUID magnetometry and MOKE, in order to compare the as-grown and the implanted films. The Curie temperature (Tc) increases and the coercivity (Hc) decreases, with increasing dopant volume. We also found that Hc increases with temperatu

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9

Zhang, Xiaohong. "A study of the structures of and hydrogen (muon) diffusion in metallic amorphous alloys." Thesis, University of Sheffield, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364293.

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10

Baulin, Oriane. "Development of amorphous metallic alloys for biomedical applications and understanding of the plasticity phenomena." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI073/document.

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Les alliages métalliques amorphes, appelés aussi verres métalliques connaissent un intérêt grandissant, de par leurs propriétés remarquables comparées à celles des alliages métalliques cristallins, comme par exemple, une haute limite élastique due à l’absence de dislocations, une résistance élevée à la corrosion provoquée par l’absence de microstructure, ou encore un faible module de Young. Ce dernier point est intéressant pour une application en tant que biomatériaux, dans le but d’éviter les phénomènes d’ostéolyses. Cependant, ce type de matériaux possède deux inconvénients majeurs : (i) un

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11

Wang, Zhi. "High strength Al-Gd-Ni-Co alloys from amorphous precursors." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-149936.

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Amorphous and nanostructured Al-based alloys have attracted significant interest owing to their promising properties, including high strength combined with low density. Unfortunately, the production of these advanced materials is limited to powders or ribbons with thickness of less than 100 micrometers due to the reduced glass forming ability of the Al-based alloys. Powder metallurgy through pressure-assisted sintering is a good solution to overcome the size limitation of these materials. In this thesis, Al84Gd6Ni7Co3 glassy powders were consolidated into high-strength bulk materials by hot

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12

Saltoglu, Ilkay. "Synthesis And Characterization Of Zirconium Based Bulk Amorphous Alloys." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1260455/index.pdf.

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In recent years, bulk amorphous alloys and nanocrystalline materials have been synthesized in a number of ferrous and non-ferrous based alloys systems, which have gained some applications due to their unique physico-chemical and mechanical properties. In the last decade, Zr-based alloys with a wide supercooled liquid region and excellent glass forming ability have been discovered. These systems have promising application fields due to their mechanical properties<br>high tensile strength, high fracture toughness, high corrosion resistance and good machinability. In this study, the aim is to mo

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13

Ayyagari, Venkata Aditya. "Effect of Alloy Composition, Free Volume and Glass Formability on the Corrosion Behavior of Bulk Metallic Glasses." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc822824/.

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Bulk metallic glasses (BMGs) have received significant research interest due to their completely amorphous structure which results in unique structural and functional properties. Absence of grain boundaries and secondary phases in BMGs results in high corrosion resistance in many different environments. Understanding and tailoring the corrosion behavior can be significant for various structural applications in bulk form as well as coatings. In this study, the corrosion behavior of several Zr-based and Fe-Co based BMGs was evaluated to understand the effect of chemistry as well as quenched in f

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14

Ayas, Can. "Theoretical And Experimental Investigation Of Bulk Glass Forming Ability In Bulk Amorphous Alloy Systems." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605884/index.pdf.

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In this study molecular dynamics simulation program in NVT ensemble using Velocity Verlet integration was written in order to investigate the glass forming ability of two metallic systems. The Zn-Mg system, one of the frontiers of simple metal-metal metallic glasses and Fe-B, inquiring attention due to presence of many bulk glass forming alloy systems evolved from this binary with different alloying element additions. In addition to this, atomistic calculations on the basis of ordering were carried out for both Zn-Mg and Fe-B systems. Ordering energy values are calculated using electronic theo

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15

Bao, Cuimin. "Étude sur la définition du terme "amorphe" par l'analyse comparative de rubans de Pd82 Si18 en termes de production, structure, microstructure, qualité et propriétés mécaniques." Thesis, Vandoeuvre-les-Nancy, INPL, 2007. http://www.theses.fr/2007INPL068N/document.

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Depuis leur découverte, un travail de recherche important a été développé sur la production, la structure, la microstructure, les propriétés et les applications des alliages métalliques amorphes. Cependant, la question de ce qui est entendu exactement par le terme « amorphe » n’est pas considérée dans la majorité des études publiées. Or, il n’existe pas de verres réels représentant un désordre parfait comme il n’existe pas de cristaux réels avec une structure parfaitement ordonnée. Il est difficile de donner une définition précise sans donner les limites d’échelle et la technique de détection

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16

Mackay, Kevin George Hamilton. "Fabrication and characterisation of high moment thin films for inductive write heads." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314178.

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17

Nascimento, Carlos Ociran Silva. "Ligas metálicas amorfas: um novo método de predição de composição com capacidade de formação de amorfos." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/735.

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Made available in DSpace on 2016-06-02T19:10:27Z (GMT). No. of bitstreams: 1 6459.pdf: 4283564 bytes, checksum: 527069b2b33732466b82a6f78943d62f (MD5) Previous issue date: 2014-02-21<br>Financiadora de Estudos e Projetos<br>This thesis presents the development of a new criterion which can indicate new compositions for amorphous metallic alloys. This new criterion was based on dense packing of spheres combined with the lambda criterion through the coordination number. The mathematical development is presented and a software was developed with the purpose of indicating alloys with best glass f

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18

Bruna, Escuer Pere. "Microstructural characterization and modelling in primary crystallization." Doctoral thesis, Universitat Politècnica de Catalunya, 2007. http://hdl.handle.net/10803/6588.

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L'objectiu de la tesi és estudiar la cinètica de les cristal·litzacions primàries en vidres metàl·lics mitjançant simulacions de tipus phase field. Una cristal·lització primària és una transició de fase sòlid-sòlid on la fase que cristal·litza (fase transformada o fase secundaria) té una composició química diferent de la fase precursora (fase no transformada o fase primària).<br/>Les dades experimentals obtingudes a partir de l'estudi calorimètric de cristal·litzacions primàries s'analitzen generalment en el marc del model KJMA (Kolmogorov, Johnson & Mehl, Avrami). Aquest model proporciona l'

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19

Back, Christophe. "Étude de la cristallisation des verres métalliques Ni₈₁B₁₉ et (FeCr) ₇₇B₂₃ par diffusion neutronique et simulations numériques." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL109N.

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Le verre métallique Ni₈₁B₁₉ cristallise en une seule étape par formation simultanée des phases cristallines Ni et Ni₃B de type cémentite le verre métallique (FeCr) ₇₇B₂₃ forme de façon polymorphe la phase (FeCr). La forme des cristallites est ovoïde. Et l'amorphe est constitué d'une multitude de domaines d'un nanomètre d'extension ordonnés mais désorientés les uns par rapport aux autres. La diffusion neutronique aux petits angles met en évidence la présence d'inhomogénéités chimiques déjà présentes dans l'amorphe qui s'amplifient pendant la cristallisation. Les simulations numériques de Ni₈₁B₁

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20

Mountjoy, Gavin. "Diffraction and microscopy studies of the structure of amorphous solids." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362969.

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21

Sharma, Satyajeet. "AMORPHOUS PHASE FORMATION IN MECHANICALLY ALLOYED FE-BASED SYSTEMS." Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2484.

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ABSTRACT Bulk metallic glasses have interesting combination of physical, chemical, mechanical, and magnetic properties which make them attractive for a variety of applications. Consequently there has been a lot of interest in understanding the structure and properties of these materials. More varied applications can be sought if one understands the reasons for glass formation and the methods to control them. The glass-forming ability (GFA) of alloys can be substantially increased by a proper selection of alloying elements and the chemical composition of the alloy. High GFA will enable in obtai

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22

Pharkya, Pallavi. "Properties and Durability of the Passive Films on a Ni-Cr-Mo Alloy and an Fe-based Bulk Metallic Glass." Case Western Reserve University School of Graduate Studies / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1232857493.

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23

Ismail, Nahla. "Electrochemical Hydrogen Absorption by Zr-Cu-Al-Ni Metallic Glasses." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2002. http://nbn-resolving.de/urn:nbn:de:swb:14-1037185293084-48289.

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Effect of electrochemical absorption of hydrogen has been studied on the Zr-based amorphous alloys. The influence of hydrogen absorption on the stability of the amorphous phase and its crystallisation was investigated. Additionally, the cathodic hydrogen reaction mechanism on the surface of the alloy, the reversibility of the absorbed hydrogen and the hydrogen diffusion in the alloy were studied. These alloys are able to absorb large amounts of hydrogen (&gt;1:1 hydrogen to metal ratio) but a rearrangement of the amorphous matrix takes place so that Cu rich areas are detected on the surfac

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24

Ha, Hung M. "Micro- and Nano-Scale Corrosion in Iron-Based Bulk Metallic Glass Sam 1651 and Silver-cored MP35N Lt Composite." Case Western Reserve University School of Graduate Studies / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1260391940.

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25

Guo, Yaofeng. "Bêta-Bcc et alliages amorphes biocompatibles à base de titane pour les implants." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENI017/document.

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Les implants de corps humain biocompatibles à base de Ti de faible module de Young et sans élèments toxiques sont développés dans deux régimes de matériaux, les alliags cristallins à base de Ti-Nb(-Sn) et les alliages amorphes à base de Ti -Fe -Si. Une série d'alliages à base de Ti-Nb(-Sn) a été synthétisée par une aspiration coulée par la moule de cuivre et soumis à différents traitements thermiques (refroidissement du four ou trempe à l'eau). La microstructure, les propriétés thermiques et mécaniques des échantillons traités telles que la coulée et la chaleur ont été étudiées. On montre que

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26

Stiehler, Martin. "Strukturelle und elektronische Eigenschaften binärer amorpher Aluminiumlegierungen mit Übergangsmetallen und Metallen der Seltenen Erden." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-83708.

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Der Einfluss der d-Zustände der Übergangsmetalle auf die Strukturbildung in amorphen Legierungen ist bisher nur unzureichend verstanden. Die vorliegende Arbeit hat zum Ziel, zusätzliche Beiträge zum Verständnis am Beispiel binärer amorpher Aluminiumlegierungen mit Übergangsmetallen zu erarbeiten. Speziell standen dabei Legierungen mit einer Untergruppe der Übergangsmetalle, den Metallen der Seltenen Erden, im Vordergrund. Im Rahmen der vorliegenden Arbeit wurden Schichten von Al-Ce im Bereich von 15at%Ce-80at%Ce durch sequentielle Flash-Verdampfung bei 4,2K im Hochvakuum hergestellt und durch

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27

Hocquette, Disdier Hélène. "Etude structurale de revetement de surface amorphe métallique élaboré par chalumeau plasma." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10016.

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Le but de cette these est l'etude structurale de revetements de surface par un depot amorphe metallique qui ont pour application la protection d'aubes de turbines hydrauliques. Les depots sont elabores par la technique du chalumeau plasma sous atmosphere et temperature controlees. La caracterisation structurale est faite principalement par microscopie electronique en transmission conventionnelle et haute resolution, ainsi que par microanalyse x. Une premiere partie presente les proprietes des verres metalliques et valide le choix de tels materiaux pour l'application industrielle envisagee. La

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28

Kim, Hyun Woo. "Structure and properties of amorphous metallic alloys : a first principles study." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-12-2328.

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Utilization of amorphous metallic alloy has received much attention for use in numerous microelectronic and electrochemical devices since they provide unique electrical, thermal conductivity, and magnetic properties. To develop these functional properties, it is essential to understand the amorphous structure and the property relationships. First principles calculations provide insight into the structure, thermodynamic stability, electronic and magnetic properties of amorphous alloys. For Ru- and Co-based alloys, the thermodynamic stability was examined by calculating the mixing energy along w

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29

"preparation of bulk amorphous Pd₄₀Ni₄₀P₂₀ alloys by compaction." 2001. http://library.cuhk.edu.hk/record=b5890792.

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Ma Lai Ching = 利用熱壓法制備塊体非晶態Pd₄₀Ni₄₀P₂₀合金 / 馬勵貞.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2001.<br>Includes bibliographical references (leaves 51).<br>Text in English; abstracts in English and Chinese.<br>Ma Lai Ching = Li yong re ya fa zhi bei kuai ti fei jing tai Pd₄₀Ni₄₀P₂₀ he jin / Ma Lizhen.<br>Acknowledgements --- p.i<br>Abstract --- p.ii<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Introduction to Metallic Glass --- p.1<br>Chapter 1.2 --- Applications of Metallic Glass --- p.2<br>Chapter 1.3 --- Solidification Process --- p.3<br>Chapter 1.4 --- Some

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30

Zhang, Yong, Hao Tan, and Yi Li. "Bulk Glass Formation in Eutectic of La-Cu-Ni-Al Metallic Alloys." 2003. http://hdl.handle.net/1721.1/3721.

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A eutectic in La-rich La-Cu₀.₅Ni₀.₅-Al alloys was determined by studying the melting behaviors and the microstructure observations. The microstructures of the La-Cu-Ni-Al alloys prepared by Bridgman Solidification and copper mould casting were studied by using scanning electron microscope (SEM). The results show that La₆₆[Cu₀.₅Ni₀.₅]₂₀Al₁₄ alloy is very near to a pseudo-ternary eutectic. When the cooling rate is higher than 450 K/s, fully amorphous can be formed; when the cooling rate is within 15 K/s to 450 K/s, the alloy has a microstructure of dendrite plus amorphous, when the cooling rate

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31

"Amorphous phase separation in a bulk metallic glass of negative heat of mixing." 2012. http://library.cuhk.edu.hk/record=b5549408.

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過去幾十年當中，金屬玻璃（包括塊狀金屬玻璃）中非晶相分離的發生已經成為了一個具有爭議性的課題。一些報告報導在具有負混合熱的Pd-Ni-P合金體系中發生了非晶相分離。然而，有一些報告聲稱相分離不能在Pd-Ni-P非晶合金中被觀察到。文獻分析表明，困難在於缺乏直接的實驗證據。<br>為了解決這個難題，示差掃描量熱儀、高分辨電子顯微鏡、掃描透射模式下的高角環射暗場相、以及能量色散X射線光譜儀等檢測儀器在我們實驗當中被使用。同時為了清楚展示非晶相分離反應，在過冷Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅熔體被冷卻為固態非晶樣品之前引入了中間熱退火處理。<br>實驗研究了三種經由不同路徑製備的A、B、C型號樣品。結果表明在非晶/液態Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅合金中可能存在獨特的短程有序結構，它會導致相分離的發生。同时研究發現，在大約625 K，調幅分解的持續時間的下限大概是200 s。調幅分解的時間常數R在大約625 K 下為0.002 s⁻¹。三种类型样品在不同的溫度下被退火從而獲得部分的結晶。A型號和B型號具有相似的行為。在低溫下，圓形的核心首先形成，接著發生共晶反應。在高溫下，出現了一種形狀為立方體的析出相。在C型號的樣品當中，核心和立方的析出物同時被發現。但是核心的成分分佈與A和B型號中出現的不同。同時，隨著退火時間的加長形核的數量也具有獨特的行為表現。作為對比，Pd₄₀Ni

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32

"Preparation of bulky ferromagnetic Fe₈₀P₁₃C₇ amorphous alloy." 2000. http://library.cuhk.edu.hk/record=b5890327.

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Chan Fu-wai = 非晶態鐵磁性鐵-磷-碳合金的製作 / 陳輔偉.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2000.<br>Includes bibliographical references.<br>Text in English; abstracts in English and Chinese.<br>Chan Fu-wai = Fei jing tai tie ci xing tie-lin-tan he jin de zhi zuo / Chen Fuwei.<br>Acknowledgments --- p.i<br>Abstract --- p.ii<br>Table of Content --- p.iv<br>Chapter Chapter 1: --- Introduction --- p.1<br>Chapter 1.1 --- Nucleation --- p.1<br>Chapter 1.1.1 --- Homogenous nucleation --- p.1<br>Chapter 1.1.2 --- Heterogeneous nucleation --- p.4<br>Chapter 1.2 --- The crystal growth --- p.5<b

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33

Wang, C. Y., Gerbrand Ceder, and Yi Li. "Amorphous Al-transition Metal Alloys as Anode Material for Lithium Ion Battery." 2005. http://hdl.handle.net/1721.1/29816.

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Al based alloy powders (Al₈₅Ni₅Y₆Co₂Fe₂) are produced by spray atomization method. High energy ball milling is done to modify the surface topology and particle size for better electrochemical performance. X ray diffraction (XRD), differential scanning calorimeter (DSC), scanning electron microscope (SEM) and transmission electron microscope (TEM) were conducted to characterize the microstructure of the alloys after ball milling. It is found that 5 hours ball milling gives the minimum crystallization and structure change. Thin film sample is also deposited on stainless steel substrate by pulsed

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34

Wang, Zhi. "High strength Al-Gd-Ni-Co alloys from amorphous precursors." Doctoral thesis, 2013. https://tud.qucosa.de/id/qucosa%3A28220.

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Amorphous and nanostructured Al-based alloys have attracted significant interest owing to their promising properties, including high strength combined with low density. Unfortunately, the production of these advanced materials is limited to powders or ribbons with thickness of less than 100 micrometers due to the reduced glass forming ability of the Al-based alloys. Powder metallurgy through pressure-assisted sintering is a good solution to overcome the size limitation of these materials. In this thesis, Al84Gd6Ni7Co3 glassy powders were consolidated into high-strength bulk materials by hot

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35

Zhang, Yong, Irene Mei Ling Lee, Hao Tan, Qin Jing, and Yi Li. "Effect of Microstructure Changes on Mechanical Properties of La₆₆Al₁₄(Cu, Ni)₂₀ Amorphous and Crystalline Alloys." 2003. http://hdl.handle.net/1721.1/3824.

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The microstructure, and phase selections of La₆₆Al₁₄(Cu, Ni)₂₀ alloy were studied by Bridgman solidifications, and composite materials of dendrites in amorphous matrix or micro- and nano- sized eutectic matrix were formed with different cooling rates. The volume fraction of the dendrite phase reaches a maximum at the cooling rate of about 15 K/s, the secondary dendrite arm spacing λ₂ decreases from 4.3 µm to 0.6 µm with the increasing of cooling rate R, and obeys the equation of λ₂R⁰.⁵&#x2077=1.74µm(K/s)R⁰.⁵&#x2077. The compression strength, as well as the elastic strain limit of the dendrite/

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36

Palla, Murali *. "Multi-Scale Approaches For Understanding Deformation And Fracture Mechanisms In Amorphous Alloys." Thesis, 2007. http://hdl.handle.net/2005/650.

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Amorphous alloys possess attractive combinations of mechanical properties (high elastic limit, ~2%, high fracture toughness, 20-50 MPa.m1/2, etc.) and exhibit mechanical behavior that is different, in many ways, from that of the crystalline metals and alloys. However, fundamental understanding of the deformation and fracture mechanisms in amorphous alloys, which would allow for design of better metallic glasses, has not been established on a firm footing yet. The objective of this work is to understand the deformation and fracture mechanisms of amorphous materials at various length scales and

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"Preparation and characterization of bulk amorphous and nanostructured iron-40 nickel-40 phosphorus-14 boron-6 alloys." 2002. http://library.cuhk.edu.hk/record=b6073403.

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"Apr 2002."<br>The numerals in title is subscript.<br>Thesis (Ph.D.)--Chinese University of Hong Kong, 2002.<br>Includes bibliographical references.<br>Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Mode of access: World Wide Web.<br>Abstracts in English and Chinese.

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Raghavan, R. "Effect Of Free-Volume On The Fracture And Fatigue Of Amorphous Alloys." Thesis, 2008. http://hdl.handle.net/2005/726.

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Bulk metallic glasses (BMGs) are a new class of structural materials and exhibit unique combinations of mechanical properties. As a result, their mechanical behavior has been an active area of scientific pursuit in the recent past and considerable emphasis has been paid to understand plastic deformation in them. It is now well accepted that shear transformation zones (STZs), aided by free volume, are the fundamental carriers of plasticity. At a microscopic level, deformation at low temperatures and high stresses tends to localize into shear bands. Most BMGs posses high fracture toughness despi

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Shariq, Ahmed. "Short range ordering and microstructure property relationship in amorphous alloys." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-B44C-D.

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Prasad, Korimilli Eswara. "Plastic Deformation During Indentation Of Crystalline And Amorphous Materials." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/2035.

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Indentation hardness, H, has been widely used to characterize the mechanical properties of materials for more than a century because of the following advantages of this technique; (1) it requires small sample and (2) the test is non destructive in nature. Recent technological advances helped in the development of instrumented indentation machines which can record the load, P, vs. displacement, h, data continuously during indentation with excellent load and displacement resolutions. From these, H and the elastic modulus, E, of the indented material can be obtained on the basis of the ‘contact a

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Tandaiya, Parag Umashankar. "Finite Element And Experimental Studies On Fracture Behavior Of Bulk Metallic Glasses." Thesis, 2009. http://hdl.handle.net/2005/1013.

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The objective of this thesis is to study the fracture behavior of bulk metallic glasses. For this purpose, detailed finite element investigation of the mode I and mixed mode (I and II) stationary crack tip fields under plane strain, small scale yielding conditions is carried out. An implicit backward Euler finite element implementation of the Anand and Su constitutive model [Anand, L. and Su, C., 2005, J. Mech. Phys. Solids 53, 1362] is used in the simulations. The effects of internal friction (μ), strain softening, Poisson's ratio (ν) and elastic mode mixity (Me) on the near-tip stress and de

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Πίσσας, Βασίλειος. "Παρασκευή και χαρακτηρισμός νέων άμορφων συμπαγών κραμάτων για εφαρμογές σε μηχανικές και σε ηλεκτρομαγνητικές διατάξεις". Thesis, 2010. http://nemertes.lis.upatras.gr/jspui/handle/10889/3619.

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Το θέμα αυτής της διπλωματικής είναι παρασκευή άμορφων μεταλλικών συμπαγών κραμάτων με τήξη σε βολταϊκό τόξο και ο χαρακτηρισμός της δομής τους και των μηχανικών ιδιοτήτων τους. Στο πρώτο κεφάλαιο γίνεται εισαγωγή στη δομή των υλικών και επεξηγούνται βασικές έννοιες των άμορφων υλικών και επίσης παρουσιάζονται οι κυριότερες εφαρμογές των άμορφων μεταλλικών συμπαγών κραμάτων. Στο δεύτερο κεφάλαιο περιγράφονται οι τεχνικές που χρησιμοποιούνται για την παρασκευή άμορφων συμπαγών μεταλλικών κραμάτων και στο τρίτο κεφάλαιο αναφέρονται οι κυριότερες φυσικές ιδιότητες των άμορφων μεταλλικών συμπαγών

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Gutierrez, Jean-Gil Rémy. "Synthesis of amorphous metallic nanoparticles using a laser ablation process." 2013. http://hdl.handle.net/2152/22492.

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Amorphous metals have been discovered in 1960 and, because of their structures, exhibit very unique mechanical, magnetic and chemical properties that can have various applications. These properties qualify them as the potential material of the future. This work focuses on a new laser ablation technique to synthesize nanoparticles of amorphous metals from aqueous feedstock. One of the critical factors in the production of amorphous metal is the cooling rate used to synthesize them. The laser ablation of microparticle aerosol (LAMA) process used in this work, with a cooling rate estimated of 10¹

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Lee, Irene Mei Ling, Yi Li, and W. Craig Carter. "Mechanical properties of La-based bulk amorphous alloy and composites." 2003. http://hdl.handle.net/1721.1/3666.

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Influence of different microstructure of La-based fully amorphous samples and its composites on the impact fracture energy were investigated and discussed. Results showed improvement in fracture energy of glassy metals with the presence intermetallic phases, but deteriorated in the presence of dendrite phases and high volume % of crystalline phases.<br>Singapore-MIT Alliance (SMA)

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"Evidence of amorphous/liquid phase separation in Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅ alloy." 2011. http://library.cuhk.edu.hk/record=b5894648.

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Yin, Weixin = 非晶液態鈀-鎳-磷合金相位分離的證據 / 殷瑋欣.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2011.<br>Includes bibliographical references.<br>Abstracts in English and Chinese.<br>Yin, Weixin = Fei jing ye tai ba-nie-lin he jin xiang wei fen li de zheng ju / Yin Weixin.<br>Acknowledgement --- p.i<br>Abstract --- p.ii<br>Contents --- p.iv<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- A Brief Introduction to Metallic Glass --- p.1<br>Chapter 1.2 --- Homogeneous Nucleation Frequency --- p.3<br>Chapter 1.3 --- Heterogeneous Nucleation Frequency --- p.4<br>Chapter 1.4 ---

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"A Study on the properties of amorphous boron and borne-silicon alloy films prepared by low pressure chemical vapour deposition." Chinese University of Hong Kong, 1991. http://library.cuhk.edu.hk/record=b5886914.

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by Ong Chung Wo.<br>Title also in Chinese.<br>Thesis (Ph.D.)--Chinese University of Hong Kong.<br>Bibliography: leaves 258-263.<br>Acknowledgements<br>Abstract<br>Table of Contents<br>Chapter Chapter 1 --- Introduction --- p.1<br>Chapter Chapter 2 --- Sample Preparation --- p.6<br>Chapter A. --- General Review of Chemical Vapour Deposition Technique --- p.6<br>Chapter B. --- Our Deposition System --- p.9<br>Chapter B.1 --- General Description --- p.9<br>Chapter B.2 --- Induction Heater --- p.10<br>Chapter B.3 --- Graphite Susceptor --- p.12<br>Chapter B.4 --- Safety --- p.13<br>Chapter

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Stiehler, Martin. "Strukturelle und elektronische Eigenschaften binärer amorpher Aluminiumlegierungen mit Übergangsmetallen und Metallen der Seltenen Erden." Doctoral thesis, 2011. https://monarch.qucosa.de/id/qucosa%3A19668.

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Der Einfluss der d-Zustände der Übergangsmetalle auf die Strukturbildung in amorphen Legierungen ist bisher nur unzureichend verstanden. Die vorliegende Arbeit hat zum Ziel, zusätzliche Beiträge zum Verständnis am Beispiel binärer amorpher Aluminiumlegierungen mit Übergangsmetallen zu erarbeiten. Speziell standen dabei Legierungen mit einer Untergruppe der Übergangsmetalle, den Metallen der Seltenen Erden, im Vordergrund. Im Rahmen der vorliegenden Arbeit wurden Schichten von Al-Ce im Bereich von 15at%Ce-80at%Ce durch sequentielle Flash-Verdampfung bei 4,2K im Hochvakuum hergestellt und durch

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Bankmann, Joachim. "Löslichkeit und Diffusion von Wasserstoff in dünnen Schichten amorpher ZrTiNiCuBe- und ZrAlNiCu-Legierungen." Doctoral thesis, 2003. http://hdl.handle.net/11858/00-1735-0000-0006-B55C-E.

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