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Journal articles on the topic 'Amorphous metallic alloys'

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Published: 4 June 2021
Last updated: 7 February 2022

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1

Zolotukhin, I. V., and Yu E. Kalinin. "Amorphous metallic alloys." Uspekhi Fizicheskih Nauk 160, no. 9 (1990): 75–110. http://dx.doi.org/10.3367/ufnr.0160.199009b.0075.

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2

Zolotukhin, I. V., and Yu E. Kalinin. "Amorphous metallic alloys." Soviet Physics Uspekhi 33, no. 9 (1990): 720–38. http://dx.doi.org/10.1070/pu1990v033n09abeh002628.

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3

Horváth, J., K. Pfahler, W. Ulfert, W. Frank, and H. Kronmüller. "Diffusion in Amorphous Metallic Alloys." Materials Science Forum 15-18 (January 1987): 523–28. http://dx.doi.org/10.4028/www.scientific.net/msf.15-18.523.

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4

Davidović, M., and P. Tomić. "Relaxation of Amorphous Metallic Alloys." Solid State Phenomena 61-62 (June 1998): 67–74. http://dx.doi.org/10.4028/www.scientific.net/ssp.61-62.67.

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5

Guseva, M. I., G. V. Gordeeva, S. M. Ivanov, et al. "Sputtering of amorphous metallic alloys." Soviet Atomic Energy 70, no. 3 (1991): 197–201. http://dx.doi.org/10.1007/bf01126465.

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6

Savitsky, E. M., M. V. Glazov, and Yu V. Efimov. "Amorphous metallic alloys as mesophases." Journal of Non-Crystalline Solids 85, no. 1-2 (1986): 133–37. http://dx.doi.org/10.1016/0022-3093(86)90085-2.

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7

Frank, W., A. Hörner, P. Scharwaechter, and H. Kronmüller. "Diffusion in amorphous metallic alloys." Materials Science and Engineering: A 179-180 (May 1994): 36–40. http://dx.doi.org/10.1016/0921-5093(94)90160-0.

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8

Dokukin, M. E., N. S. Perov, A. I. Beskrovnyi, and E. B. Dokukin. "Structural relaxation of amorphous metallic alloys." Journal of Magnetism and Magnetic Materials 272-276 (May 2004): E1151—E1152. http://dx.doi.org/10.1016/j.jmmm.2003.12.1095.

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9

Schwarz, Ricardo B. "Formation of Amorphous Metallic Alloys by Solid-State Reactions." MRS Bulletin 11, no. 3 (1986): 55–58. http://dx.doi.org/10.1557/s0883769400054889.

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AbstractFor the last 25 years, amorphous metallic alloys have been prepared by the rapid quenching of melts. Recently, new methods of synthesis based on isothermal solid-state reactions have been developed. It has further been shown that the reaction products can be predicted from free energy diagrams that treat the amorphous alloy as an undercooled liquid. These discoveries have opened new windows to the synthesis of novel metastable materials, both amorphous and crystalline. This paper reviews the basic concepts behind amorphization by solid-state reactions and discusses our current understanding of the nucleation and growth of the amorphous alloy.
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10

Yang, Xia, and Shou Jie Yang. "Crystallization Behavior of Al-Y-Ni-Co Metallic Glass." Advanced Materials Research 482-484 (February 2012): 1580–84. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.1580.

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As an important lightweight and high-strength structural material, aluminum alloy is the optimum material for airplane and aircraft. Amorphous Al-based alloys are attractive materials for structural applications because of their high strength of about 1000MPa. Crystallization behavior of amorphous Al-based alloys is critical to the synthesis of high-strength nanocrystalline aluminum alloys in bulk form. The crystallization behavior of an Al85Y8Ni5Co2 metallic glass produced by rapid solidification of the melt was studied in this paper. Microstructure transformation during crystallization was identified by X-ray diffraction. It is found that the initial crystallization of the amorphous alloy occurs through the precipitation of α-Al particles, followed by precipitation of hcp-Al3Y and an unidentified phase.
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11

Fedorov, Victor, Alexey Yakovlev, Tatiana Pluzhnikova, Arseniy Berezner, Dmitry Fedotov, and Maxim Kombarov. "Regularities of Changing Amorphous Metallic Alloys Properties under Exposure to External Influences." Applied Mechanics and Materials 788 (August 2015): 205–10. http://dx.doi.org/10.4028/www.scientific.net/amm.788.205.

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In this paper we have studied changes in the structure and properties of amorphous metallic alloys in annealing. We have identified the regularity of plasticity decreasing. We have determined that processes decreasing plasticity are thermally activated. The ratio of the alloy components affects the shape of the plasticity-temperature curves. Based on experimental results we have proposed an energy model of the plasticity formation in alloys in annealing, We have determined the relation between a crystallization temperature and the concentration of cobalt in ribbon metallic glasses. We have constructed diagrams of the time-temperature stability which allow establishing acceptable exploitation modes of amorphous metallic alloys and products made from them.
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12

Tabachnikova, Elena D., Pavel Diko, Václav Ocelík, and P. Duhaj. "Low Temperature Plasticity of Amorphous Metallic Alloys." Solid State Phenomena 35-36 (September 1993): 569–74. http://dx.doi.org/10.4028/www.scientific.net/ssp.35-36.569.

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13

dos Santos, D. S., and P. E. V. de Miranda. "Hydrogen diffusivity in Fe40Ni38Mo4B18 amorphous metallic alloys." Journal of Alloys and Compounds 348, no. 1-2 (2003): 241–46. http://dx.doi.org/10.1016/s0925-8388(02)00845-9.

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14

Bengus,, V. Z., E. D. Tabachnikova,, and A. S. Bakai,. "STRAIN-RATE SOFTENING IN AMORPHOUS METALLIC ALLOYS." Journal of the Mechanical Behavior of Materials 11, no. 1-3 (2000): 13–16. http://dx.doi.org/10.1515/jmbm.2000.11.1-3.13.

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15

Fedorov, V. A., T. N. Pluzhnikova, and A. D. Berezner. "Multicycle electroimpulse fatigue of amorphous metallic alloys." Journal of Physics: Conference Series 1115 (November 2018): 052016. http://dx.doi.org/10.1088/1742-6596/1115/5/052016.

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16

Chenakin, S. P., V. T. Cherepin, A. L. Pivovarov, and M. A. Vasilev. "Secondary Ion Emission from Amorphous Metallic Alloys." physica status solidi (a) 96, no. 1 (1986): K21—K26. http://dx.doi.org/10.1002/pssa.2210960149.

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17

Kakehashi, Y., and M. Yu. "Metallic magnetism in amorphous Co-Y alloys." Physical Review B 49, no. 21 (1994): 15076–83. http://dx.doi.org/10.1103/physrevb.49.15076.

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18

Bøttiger, J., N. G. Chechenin, N. Karpe, and J. P. Krog. "Diffusion in thin-film amorphous metallic alloys." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 85, no. 1-4 (1994): 206–15. http://dx.doi.org/10.1016/0168-583x(94)95815-7.

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19

Maeda, Kouji, Tetsuo Ikari, Yoshito Akashi, and Koji Futagami. "Crystallization mechanism of amorphous Ni65Cr16P19 metallic alloys." Journal of Materials Science 29, no. 6 (1994): 1449–54. http://dx.doi.org/10.1007/bf00368908.

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20

Arkhangel'skii, V. M., V. A. Vasil'ev, B. S. Mitin, and A. A. Skuridin. "Mechanisms of comminution of amorphous metallic alloys." Soviet Powder Metallurgy and Metal Ceramics 25, no. 6 (1986): 451–54. http://dx.doi.org/10.1007/bf00792376.

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21

Miškuf, Jozef, Kornel Csach, Alena Juríková, Mária Huráková, Martin Miškuf, and Elena D. Tabachnikova. "Conchoidal Fracture of Zr- and Mg-Based Amorphous Glass." Materials Science Forum 891 (March 2017): 504–8. http://dx.doi.org/10.4028/www.scientific.net/msf.891.504.

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In metallic glasses plastic deformation occurs via the creation and the propagation of a softened region in the shear bands. Some of the high strength metallic glasses (as Zr-based metallic alloys) exhibit complex shear band topography and the final failure respects the allocation of the shear bands. We studied the differences in the fracture surfaces of Zr-and Mg-based amorphous alloys. Ductile behaviour of the shear bands in Zr-based amorphous alloy tends to the dimple creation during the failure. On the fracture surfaces the vein pattern morphology manifestations were present. Conchoidal fracture was typical for Mg-based amorphous glass. Two different surface morphologies, plumes and rib marks ornament the fracture surfaces.
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22

Kim, Yeon-Wook. "Amorphous solidification in submicron droplets of pure metals." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 450–51. http://dx.doi.org/10.1017/s0424820100104315.

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Many techniques have been developed for synthesis of amorphous materials. The most successful method used to form metallic glasses from melts has been to alloy pure metals with other elements in order to decrease the thermodynamic and kinetic driving force for crystallization. There are two common groups of alloying systems that form glass effectively; metal-metalloid alloys and intertransition metal alloys. These alloys would be readily solidified as an amorphous phase by splat quenching, metal spinning, or laser surface melting. In the 1970's, pure metals such as Cr, Fe, and Mn were made amorphous in thin film form by evaporation of metal vapors onto a very cold substrate (4 K). Recently, Kim, Lin, and Kelly discovered amorphous phases in rapidly solidified droplets of pure iron and alloys of iron and nickel. The submicron droplets of liquid metal were produced and cooled in free fright through a vacuum chamber.
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23

Yang, S. Z., X. Han, J. Zhao, and X. Ji. "A Combined Composition Design for Metallic Glasses from Thermodynamic and Structure Rules." Advanced Materials Research 988 (July 2014): 169–72. http://dx.doi.org/10.4028/www.scientific.net/amr.988.169.

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A composition design method from thermodynamic and structural rules for metallic glasses is proposed in this paper. Using the above composition design method, BMG compositions could be determined quickly and it could guide the development of new amorphous alloys. Several new amorphous alloys were fabricated with this new method in Cu-Zr-Ti and Cu-Zr-Al alloying systems. Since this composition design provides a method of determination from both thermodynamic and atomic structure factors, this method increases the accuracy of the amorphous alloy composition design and reduces the development of new amorphous alloy error rate.
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24

Shin, Seung Y., J. H. Kim, D. M. Lee, et al. "New Cu-Based Bulk Metallic Glasses with High Strength of 2000 MPa." Materials Science Forum 449-452 (March 2004): 945–48. http://dx.doi.org/10.4028/www.scientific.net/msf.449-452.945.

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New Cu-based bulk amorphous alloys exhibiting a large supercooled liquid region and good mechanical properties were formed in a quaternary Cu-Ni-Zr-Ti systems consisting of only metallic elements. The compositional range for the formation of the amorphous alloys that have high glass forming ability (GFA) (> 3 mm diameter) and large supercooled liquid region (> 50 K) is defined in the pseudo-ternary phase diagram Cu-Ni-(Zr, Ti). A bulk amorphous Cu54Ni6Zr22Ti18alloy with the diameter of 6 mm can be prepared by copper mold casting. The Cu54Ni6Zr22Ti18alloy shows glass transition temperature (Tg) of 712 K, crystallization temperature (Tx) of 769 K and supercooled liquid region (ΔTx) of 57 K. The Cu54Ni6Zr22Ti18alloy exhibits high compressive fracture strength of about 2130 MPa with a plastic strain of about 1.5 %. The new Cu-based bulk amorphous alloy with high GFA and good mechanical properties allows us to expect the extension of application fields as a new engineering material.
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25

Baricco, Marcello, Tanya A. Başer, Gianluca Fiore, et al. "Bulk Metallic Glasses." Materials Science Forum 604-605 (October 2008): 229–38. http://dx.doi.org/10.4028/www.scientific.net/msf.604-605.229.

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Rapid quenching techniques have been successfully applied since long time for the preparation of metallic glasses in ribbon form. Only in the recent years, the research activity addressed towards the synthesis of bulk metallic glasses (BMG), in form of ingots with a few millimetres in thickness. These materials can be obtained by casting techniques only for selected alloy compositions, characterised by a particularly high glass-forming tendency. Bulk amorphous alloys are characterised by a low modulus of elasticity and high yielding stress. The usual idea is that amorphous alloys undergo work softening and that deformation is concentrated in shear bands, which might be subjected to geometrical constraints, resulting in a substantial increase in hardness and wear resistance. The mechanical properties can be further improved by crystallisation. In fact, shear bands movement can be contrasted by incorporating a second phase in the material, which may be produced directly by controlled crystallisation. Soft magnetic properties have been obtained in Fe-based systems and they are strongly related to small variations in the microstructure, ranging from a fully amorphous phase to nanocrystalline phases with different crystal size. The high thermal stability of bulk metallic glasses makes possible the compression and shaping processes in the temperature range between glass transition and crystallisation. Aim of this paper is to present recent results on glass formation and properties of bulk metallic glasses with various compositions. Examples will be reported on Zr, Fe, Mg and Pd-based materials, focussing on mechanical and magnetic properties.
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26

Yu, Dong Man, Yan Hui Hu, Di Wang, and Xiao Jing Li. "Crystallization Characteristic Study for Amorphous of Nd60Al10Cu20Ni10." Applied Mechanics and Materials 556-562 (May 2014): 385–88. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.385.

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Since the first synthesis of an amorphous phase in Au-Si system from liquid, a great number of amorphous alloys have been prepared by rapid solidification. Almost all amorphous alloys require high cooling rates and a lot of studies have been carried out for these metallic glasses. In this study, metallic glass of Nd60Al10Cu20Ni10 have been fabricated, and experimental research was carried out to reflect thermal features. It indicates that the Nd-based amorphous has shown a distinct glass transition and stable super-cooled liquid region. The research results show that the paramagnetic performance of Nd60Al10Cu20Ni10 metallic glass is different from other hard magnetic alloys at ordinary temperature. From the DSC experiment, it is found that the glass transition temperature is increasing with the heating temperature.
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27

Inoue, Akihisa, Shintaro Sobu, Dmitri V. Louzguine, Hisamichi Kimura, and Kenichiro Sasamori. "Ultrahigh strength Al-based amorphous alloys containing Sc." Journal of Materials Research 19, no. 5 (2004): 1539–43. http://dx.doi.org/10.1557/jmr.2004.0206.

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Amorphous metallic alloys possess high strength characteristics, which are superior to crystalline materials. Here we report an influence of Sc addition on glass-forming ability, glass-transition behavior, supercooled liquid region, and mechanical properties of an Al84Y9Ni5Co2 glassy alloy. This paper also aims to present a promising (Al0.84Y0.09Ni0.05Co0.02)95Sc5 amorphous alloy. This alloy has an ultrahigh tensile fracture strength exceeding 1500 MPa, which surpasses those for all the other Al-based fully crystalline and amorphous alloys reported to date, in addition to high Young’s modulus of 78 GPa. The fracture surface of this new alloy exhibited vein pattern typical for amorphous alloys with good ductility, and multiple shear bandswere observed on the lateral surface. The ultrahigh tensile strength of the (Al0.84Y0.09Ni0.05Co0.02)95Sc5 amorphous alloy results from an increase in the interatomic constraint force by the addition of Sc, an element having highly negative enthalpy of mixing with Al, Ni, and Co and the highest chemical affinity with Al among the alloying elements.
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28

Nowosielski, R., K. Cesarz-Andraczke, P. Sakiewicz, A. Maciej, A. Jakóbik-Kolon, and R. Babilas. "Corrosion of Biocompatible Mg66+xZn30-xCa4 (x=0.2) Bulk Metallic Glasses." Archives of Metallurgy and Materials 61, no. 2 (2016): 807–10. http://dx.doi.org/10.1515/amm-2016-0136.

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Abstract The aim of this paper was to investigate the corrosion resistance of Mg66Zn30Ca4 and Mg68Zn28Ca4 metallic glasses and evaluate the ability of this amorphous alloy use for medical applications as biodegradable medical implants. Taking into account the amount of Mg, Zn, Ca elements dissolved in multielectrolyte physiological fluid (MPF) from Mg66+xZn30-xCa4 (x=0.2) alloys the daily dose of evolved ions from alloys components was determined. Additional goal of the paper was determination of corrosion rate (Vcorr) and amount of hydrogen evolved from amorphous magnesium alloys in simulated environment of human body fluids during 24h immersion and during electrochemical tests. Corrosion studies were done in the multielectrolyte physiological fluid (MPF) at 37°C. The amount of hydrogen evolved [ml/cm2] and corrosion rate Vcorr [mm/year] of amorphous Mg66Zn30Ca4 and Mg68Zn28Ca4 alloys were compared. The work also presents characterization of Mg-based bulk metallic glasses structure in the form of 2 mm thickness plates. Samples structure was analyzed by means of X-ray diffraction. Fracture and surface morphology of magnesium alloy samples were identified using scanning electron microscopy.
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29

Radu, Bogdan, Dragoş Buzdugan, Cosmin Codrean, Viorel Aurel Şerban, and George Vișan. "Numerical Model of Thermal Field Developed in Fe67Cr4Mo4Ga4P12B5C4 Bulk Amorphous Alloy Processing." Solid State Phenomena 254 (August 2016): 249–54. http://dx.doi.org/10.4028/www.scientific.net/ssp.254.249.

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Metallic amorphous materials were developed during 80’s as new materials, with very interesting industrial properties (heat conductivity, magnetic properties, fusion temperature, corrosion resistance, etc.). Technology to obtain these materials, based on very rapid cooling of a melted alloy with glass forming ability, has limitations for the dimensions of the products that can be obtained with amorphous structure (thickness has to be very thin), which can be overpassed by development of bulk amorphous alloys with high glass forming ability and good control of the cooling speed. Numerical modeling of thermal field during ultra-high cooling, developed in researches presented in this paper, allows researchers to estimate the results of applying in reality certain cooling conditions. This model will help developers of bulk amorphous alloys in checking if are ensured conditions to obtain an amorphous alloy with fewer experimental tests, less time and low expenses.
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30

Vodă, Mircea, Cosmin Codrean, Viorel Aurel Şerban, Dacian Toṣa, Eugen Zặbavặ, and Alberto Pertuz-Comas. "Magnetic properties optimization of Zr/Fe dual amorphous phase bulk metallic glasses." Revista UIS Ingenierías 19, no. 1 (2020): 67–71. http://dx.doi.org/10.18273/revuin.v19n1-2020006.

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The dual amorphous phase bulk metallic glasses (DAPBMGs) contain two distinct amorphous alloys in order to bring together all the favorable properties of each phase. A viable method for obtaining dual bulk amorphous alloys is powder metallurgy. A Zr/Fe DAPBMG were successfully prepared by hot-pressing of Zr –based and Fe –based glassy alloy powder in different volumetric proportions. The samples obtained were structural investigated by scanning electron microscopy and X-Ray diffraction. Magnetic properties were determined using hysteresis graph of integrator fluxmeter type. It was found that with increasing the volume ratio of the Fe-based alloy decreases the coercivity and increases saturation magnetization
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31

Delaye, J. M., and Yves Limoge. "Defects and Diffusion Mechanism in Amorphous Metallic Alloys." Defect and Diffusion Forum 95-98 (January 1993): 1181–86. http://dx.doi.org/10.4028/www.scientific.net/ddf.95-98.1181.

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32

Miglierini, Marcel, Adriana Lančok, and Márius Pavlovič. "Ion bombardment of Fe-based amorphous metallic alloys." Hyperfine Interactions 189, no. 1-3 (2009): 45–52. http://dx.doi.org/10.1007/s10751-009-9928-5.

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33

Grandjean, A., and Y. Limoge. "Diffusion study in NixZr1−x amorphous metallic alloys." Acta Materialia 45, no. 4 (1997): 1585–98. http://dx.doi.org/10.1016/s1359-6454(96)00269-8.

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34

Mattern, N. "Structure formation in liquid and amorphous metallic alloys." Journal of Non-Crystalline Solids 353, no. 18-21 (2007): 1723–31. http://dx.doi.org/10.1016/j.jnoncrysol.2007.01.042.

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35

Dean, S. W., S. Jayalakshmi, and E. Fleury. "Hydrogen Embrittlement in Metallic Amorphous Alloys: An Overview." Journal of ASTM International 7, no. 3 (2010): 102522. http://dx.doi.org/10.1520/jai102522.

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36

Pozdnyakov, V. A., and A. M. Glezer. "Structural mechanisms of fracture in amorphous metallic alloys." Doklady Physics 47, no. 12 (2002): 852–55. http://dx.doi.org/10.1134/1.1536214.

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37

Shao, G. "Prediction of amorphous phase stability in metallic alloys." Journal of Applied Physics 88, no. 7 (2000): 4443. http://dx.doi.org/10.1063/1.1289788.

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38

Mil'man, Yu V., S. V. Pan, S. V. Postoi, and R. K. Ivashchenko. "Microhardness of amorphous metallic alloys Fe-Cr-B." Soviet Powder Metallurgy and Metal Ceramics 29, no. 8 (1990): 632–35. http://dx.doi.org/10.1007/bf00795094.

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39

Miškuf, J., K. Csach, V. Ocelík, V. Z. Bengus, E. D. Tabachnikova, and P. Duhaj. "Ductile fracture surface morphology of amorphous metallic alloys." Czechoslovak Journal of Physics 52, S1 (2002): A121—A124. http://dx.doi.org/10.1007/s10582-002-0028-x.

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40

Pustovalov, Evgeny Vladislavovich, Evgeny B. Modin, and Aleksandr N. Fedorets. "Atomic Structure Design of Rapidly Quenched Amorphous Cobalt-Based Alloys." Solid State Phenomena 265 (September 2017): 569–74. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.569.

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The research presents the atomic structure investigation of amorphous rapidly quenched Co58Ni10Fe5Si11B16 at.% alloys. The alloys were quenched with linear velocity of cooper wheel surface from 22 to 38 m/s. We found a nonlinear dependence of local atomic ordering from linear velocity of cooling wheel. The average lateral density of ordered atomic clusters of 5 nm size changes from 4% to 8%. The amorphous alloy with metastable disordered structure with lower level of free energy is more stable against the external conditions. This approach can be used to determine the best technological parameters for preparing amorphous metallic alloy with metastable structure.
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41

Guo, J., X. Hu, J. Liu, T. Feng, E. Y. Yoon, and H. S. Kim. "Correlation Between Superheated Liquid Fragility And Onset Temperature Of Crystallization For Al-Based Amorphous Alloys." Archives of Metallurgy and Materials 60, no. 2 (2015): 1543–46. http://dx.doi.org/10.1515/amm-2015-0169.

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Abstract Amorphous alloys or metallic glasses have attracted significant interest in the materials science and engineering communities due to their unique physical, mechanical, and chemical properties. The viscous flow of amorphous alloys exhibiting high strain rate sensitivity and homogeneous deformation is considered to be an important characteristic in thermoplastic forming processes performed within the supercooled liquid region because it allows superplastic-like deformation behavior. Here, the correlation between the superheated liquid fragility, and the onset temperature of crystallization for Al-based alloys, is investigated. The activation energy for viscous flow of the liquid is also investigated. There is a negative correlation between the parameter of superheated liquid fragility and the onset temperature of crystallization in the same Al-based alloy system. The activation energy decreases as the onset temperature of crystallization increases. This indicates that the stability of a superheated liquid can affect the thermal stability of the amorphous alloy. It also means that a liquid with a large superheated liquid fragility, when rapidly solidified, forms an amorphous alloy with a low thermal stability.
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42

Mingolo, N., and J. J. Rocca. "Production of amorphous metallic surfaces by means of a pulsed glow discharge electron beam." Journal of Materials Research 7, no. 5 (1992): 1096–99. http://dx.doi.org/10.1557/jmr.1992.1096.

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A pulsed glow discharge electron beam has been used for the production of metallic amorphous surfaces in MgZn alloys. Electron beam pulses of 20 μs pulse width produced by a 40 A, 22.5 kV glow discharge were found to provide sufficient energy for melting the metallic surfaces; that due to the rapid cooling to the substrate yielded amorphous phases. The system allows control of the energy density, penetration, and pulse width of the heating pulse.
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43

Holzman, Louis M., Yeon-Wook Kim, and Thomas F. Kelly. "Structure of pure metallic and semiconductor glasses." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 142–43. http://dx.doi.org/10.1017/s0424820100173844.

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There has been a great deal of interest in amorphous materials as the advance of technology has enabled a greater variety of alloys and elements to be quenched into the amorphous state and as new uses for amorphous materials have been developed. Because the analysis of the structure of amorphous alloys is quite complicated, it is highly desirable to have specimens available of pure elements in the amorphous state in order to more easily study amorphous structure and for comparison with theory. However, very few pure elements have been quenched into the amorphous state and most of those that have been are only stable at temperatures close to absolute zero. This has limited the methods available for the study of their structure. We have produced room-temperature-stable amorphous samples of pure elements (V,Nb,Ta,Mo,W,Fe,Co,Ni,Si,Ge) from the melt using electrohydrodynamic (EHD) atomization. Diffraction patterns of these samples were obtained using a Vacuum Generators HB501 STEM and these patterns were analyzed to obtain the radial distribution function for the pure element specimens.
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44

Nicolaescu, Mircea, Cosmin Codrean, Emilia Binchiciu, and Bogdan Radu. "Production of Bulk Metallic Glasses by Ultrasonic Welding of Nickel Based Amorphous Ribbons." Advanced Materials Research 1157 (February 2020): 123–29. http://dx.doi.org/10.4028/www.scientific.net/amr.1157.123.

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With the evolution of society new materials or classes of materials must be developed. The metallic alloys with amorphous structure have exceptional physical properties due to the spatial order of the atoms in structure and the absence of crystalline defects such as dislocations, grain boundaries, etc. Due to the metastable states in which these alloys are located, obtaining bulk materials from amorphous metal alloys is difficult, being limited to simple geometries and high production cost. This problem can be solved by using the ultrasonic welding of amorphous ribbons for the production of bulk metallic glasses.In this paper, we aimed to produce bulk metallic glasses materials by welding the ribbon packages in ultrasonic field. In order to prove the preservation of the amorphous structure of both the primary welding alloys as well as after the welding of the amorphous ribbons, Differential thermal analysis (DTA), X-ray diffraction (XRD), Scanning electron microscopy (SEM) analysis were carried out. Vickers micro-hardness test was also performed in order to reveal the mechanical properties in the welded joint.
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45

Delogu, Francesco. "Strain localization in metallic amorphous/amorphous composites." Intermetallics 16, no. 7 (2008): 904–9. http://dx.doi.org/10.1016/j.intermet.2008.04.010.

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46

Ashley, Steven. "Metallic Glasses Bulk Up." Mechanical Engineering 120, no. 06 (1998): 72–74. http://dx.doi.org/10.1115/1.1998-jun-4.

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Vitreloy, a metallic–glass alloy of zirconium and beryllium from Amorphous Technologies International (ATI) in Laguna Niquel, CA, is extensively being used in golf clubs. Liquidmetal golf-club heads are fabricated from an amorphous metal alloy that has excellent rebound and vibration-absorbing properties. Research indicates that the prized physical properties of metallic glasses arise in large part from their lack of grain boundaries, which can serve as points of weakness. Liquidmetal putters have a ‘soft’ feel when striking the ball, which the makers claim provides players with improved touch on putting greens. The elevated strength-to-weight ratios exhibited by Liquidmetal alloys make the metallic glasses promising for a range of high-performance applications. Sports enthusiasts may also soon find bulk metallic glasses like Vitreloy in other high-end sporting goods such as tennis rackets, baseball bats, bicycle frames, hunting bows, and even edged tools such as axes. ATl management stated that high-performance sporting goods are only a first step in the market; the new family of materials could also be promising for other, more serious applications.
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47

Chen, Qing Jun, Hui Yan Yu, Xian Liang Zhou, and Xiao Zhen Hua. "Electrochemical Corrosion Behavior of Different Heat-Treatment Temperature Fe-Based Bulk Amorphous Alloy." Advanced Materials Research 399-401 (November 2011): 2309–13. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.2309.

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Abstract: Fe41Co7Cr15Mo14C15B6Y2(at%) bulk metallic glass was prepared by copper mold casting. Nano-crystalline Fe41Co7Cr15Mo14C15B6Y2alloys were obtained by annealing. The influence of heat treatment at different temperatures in the alloy microstructure was identified by X-ray diffraction (XRD), and a comparative study of the electrochemical corrosion behaviors of amorphous and amorphous/nanocrystalline alloys was performed by potentiodynamic polarization method and electrochemical impedance spectroscopy (EIS) in 1.5M HCI solution, and the corrosion morphologies of the samples were observed by scanning electron microscopy (SEM). The results show amorphous alloy plays excellent anti-corrosion ability than that of the heat-treated samples, and the anti-corrosion ability of amorphous/nanocrystalline alloys decrease with the increasing of heat-treatment temperature.
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48

Aronin, Alexandr, and Galina Abrosimova. "Specific Features of Structure Transformation and Properties of Amorphous-Nanocrystalline Alloys." Metals 10, no. 3 (2020): 358. http://dx.doi.org/10.3390/met10030358.

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This work is devoted to a brief overview of the structure and properties of amorphous-nanocrystalline metallic alloys. It presents the current state of studies of the structure evolution of amorphous alloys and the formation of nanoglasses and nanocrystals in metallic glasses. Structural changes occurring during heating and deformation are considered. The transformation of a homogeneous amorphous phase into a heterogeneous phase, the dependence of the scale of inhomogeneities on the component composition, and the conditions of external influences are considered. The crystallization processes of the amorphous phase, such as the homogeneous and heterogeneous nucleation of crystals, are considered. Particular attention is paid to a volume mismatch compensation on the crystallization processes. The effect of changes in the amorphous structure on the forming crystalline structure is shown. The mechanical properties in the structure in and around shear bands are discussed. The possibility of controlling the structure of fully or partially crystallized samples is analyzed for creating new materials with the required physical properties.
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49

Tarapov, S. I., Z. A. Spolnik, and D. P. Belozorov. "Microwave Resonance Study of Crystallization of Amorphous Metallic Alloys." Telecommunications and Radio Engineering 53, no. 9-10 (1999): 191–96. http://dx.doi.org/10.1615/telecomradeng.v53.i9-10.210.

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50

Turchanin, A. A., M. A. Turchanin, and P. G. Agraval. "Thermodynamics of Undercooled Liquid and Amorphous Binary metallic Alloys." Journal of Metastable and Nanocrystalline Materials 10 (January 2001): 481–86. http://dx.doi.org/10.4028/www.scientific.net/jmnm.10.481.

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