Artykuły w czasopismach: „Brittle Metallic Glasses”

1

Sun, Y. H. "Inverse ductile–brittle transition in metallic glasses?" Materials Science and Technology 31, no. 6 (2014): 635–50. http://dx.doi.org/10.1179/1743284714y.0000000684.

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Zhao, J. X., R. T. Qu, F. F. Wu, et al. "Fracture mechanism of some brittle metallic glasses." Journal of Applied Physics 105, no. 10 (2009): 103519. http://dx.doi.org/10.1063/1.3129313.

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Ding, Rui Xian, Sheng Zhong Kou, Jian Jun Fan, and Ye Jiang. "Effect of Raw Material Purity on Structure and Properties of Metallic Glasses." Materials Science Forum 1035 (June 22, 2021): 759–67. http://dx.doi.org/10.4028/www.scientific.net/msf.1035.759.

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Zirconium base metallic glasses [Zr0.73(Cu0.59Ni0.41)0.27]87Al13 was fabricated by industrial zirconium with low purity and high purity zirconium according to different quality ratios in order to study the effect of raw material purity on the structure and properties of metallic glasses. The results showed that the complete metallic glasses was failed to be fabricate with low purity zirconium. And the compression process was typical brittle fracture with low compressive strength and without plastic strain. The glasses forming ability of low purity zirconium metallic glass with different purity was significantly improved after the addition of yttrium element. The compression experiments showed that the compressive strength and plasticity of metallic glasses were improved, and the microhardness was also increased. It indicates that yttrium element can eliminate the adverse effect of impurity in low purity zirconium on the glasses forming ability of the alloy and improve the structural properties of the metallic glasses.

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Lee, Min Ha, Joong Hwan Jun, and Jürgen Eckert. "Effect of Residual Stress on Mechanical Property of Monolithic Bulk Metallic Glass." Materials Science Forum 654-656 (June 2010): 1050–53. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.1050.

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Mechanical treatments such as deep rolling are known to affect the strength and toughness of metallic glass due to the residual stress. It is well known that compressive residual stress states usually enhance the mechanical properties in conventional metallic materials. We present investigations on the change of fracture behavior related with mechanical properties of “brittle” bulk metallic glass by cold rolling at room temperature. Improvement of the intrinsic plasticity is observed not only after constrained cyclic compression but also after cold rolling. Moreover, neither nanocrystallization nor phase separation occurs during deformation. By these findings we provide a unique fundamental basis by considering the introduction of structural inhomogeneity and ductility improvement in metallic glasses. The experimental evidence clearly supports that such an inhomogeneous glassy can be produced by residual stress in well known “brittle” bulk metallic glasses, and does not depend on a specific pinpointed chemical composition.

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Guo, S. F., J. L. Qiu, P. Yu, S. H. Xie, and W. Chen. "Fe-based bulk metallic glasses: Brittle or ductile?" Applied Physics Letters 105, no. 16 (2014): 161901. http://dx.doi.org/10.1063/1.4899124.

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Qiao, J. W., M. M. Meng, Z. H. Wang, et al. "Scattering mechanical performances for brittle bulk metallic glasses." AIP Advances 4, no. 11 (2014): 117107. http://dx.doi.org/10.1063/1.4901280.

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Murali, P., R. Narasimhan, T. F. Guo, Y. W. Zhang, and H. J. Gao. "Shear bands mediate cavitation in brittle metallic glasses." Scripta Materialia 68, no. 8 (2013): 567–70. http://dx.doi.org/10.1016/j.scriptamat.2012.11.038.

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Yu, P., Y. H. Liu, G. Wang, H. Y. Bai, and W. H. Wang. "Enhance plasticity of bulk metallic glasses by geometric confinement." Journal of Materials Research 22, no. 9 (2007): 2384–88. http://dx.doi.org/10.1557/jmr.2007.0318.

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We report that bulk metallic glasses (BMGs) with large plasticity can be obtained in conventional brittle BMGs by a shrink-fit metal sleeve. The mechanical performance especially the plasticity in the Zr41.2Ti13.8Cu12.5Ni10Be22.5 BMG with a shrink-fit copper sleeve is much enhanced. The approach results in the formation of the highly dense and frequent interacting and arresting events of shear bands and is the origin of the observed large global plasticity. The results present another simple step toward toughening the inherently brittle BMGs.

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9

Hofmann, Douglas C., and William L. Johnson. "Improving Ductility in Nanostructured Materials and Metallic Glasses: “Three Laws”." Materials Science Forum 633-634 (November 2009): 657–63. http://dx.doi.org/10.4028/www.scientific.net/msf.633-634.657.

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Nanostructured materials and bulk metallic glasses are relatively new classes of engineering materials that have promise for unique metals applications. However, both these materials suffer from limited room temperature ductility in unconfined loading geometries. In this work, we present three experimental rules that we have observed to be necessary to toughen bulk metallic glasses. We reason that adaptations to these rules may provide the solution for toughening nanostructured composites and other brittle materials.

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10

Akçay, F. A. "Structural Characteristic Length in Metallic Glasses." Journal of Mechanics 36, no. 2 (2020): 255–64. http://dx.doi.org/10.1017/jmech.2019.64.

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ABSTRACTFracture of materials at the microscopic level involves a characteristic length related to microstructure. However, a clear structure-property relationship is still absent in metallic glasses. Therefore, a physics-based expression is derived for the characteristic length (relevant to brittle fracture) in metallic glasses (MGs) in order to link the microscopic material features controlling the fracture process to the macroscopic material parameters. The derived characteristic length is associated to micro/nano structural fracture patterns, critical crack tip opening displacement as well as fracture toughness. Characteristic lengths of various metallic glasses are determined using the proposed expression and compared to the experimental results. Theoretical results are in very good agreement with the experimental results of various metallic glasses. Furthermore, the contribution of characteristic length as well as macroscopic material parameters such as Poisson’s ratio, yield strength, and Young’s modulus on fracture toughness (and fracture energy) is investigated and compared to the experimental results.

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11

Yang, Guan-Nan, Yang Shao, and Ke-Fu Yao. "Understanding the Fracture Behaviors of Metallic Glasses—An Overview." Applied Sciences 9, no. 20 (2019): 4277. http://dx.doi.org/10.3390/app9204277.

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Fracture properties are crucial for the applications of structural materials. The fracture behaviors of crystalline alloys have been systematically investigated and well understood. The fracture behaviors of metallic glasses (MGs) are quite different from that of conventional crystalline alloys and have drawn wide interests. Although a few reviews on the fracture and mechanical properties of metallic glasses have been published, an overview on how and why metallic glasses fall out of the scope of the conventional fracture mechanics is still needed. This article attempts to clarify the up-to-date understanding of the question. We review the fracture behaviors of metallic glasses with the related scientific issues including the mode I fracture, brittle fracture, super ductile fracture, impact toughness, and fatigue fracture behaviors. The complex fracture mechanism of MGs is further discussed from the perspectives of discontinuous stress/strain field, plastic zone, and fracture resistance, which deviate from the classic fracture mechanics in polycrystalline alloys. Due to the special deformation mechanism, metallic glasses show a high variability in fracture toughness and other mechanical properties. The outlook presented by this review could help the further studies of metallic glasses. The review also identifies some key questions to be answered.

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12

Huang, X., Z. Ling, and L. H. Dai. "Ductile-to-brittle transition in spallation of metallic glasses." Journal of Applied Physics 116, no. 14 (2014): 143503. http://dx.doi.org/10.1063/1.4897552.

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Pan, D. G., H. F. Zhang, A. M. Wang, Z. G. Wang, and Z. Q. Hu. "Fracture instability in brittle Mg-based bulk metallic glasses." Journal of Alloys and Compounds 438, no. 1-2 (2007): 145–49. http://dx.doi.org/10.1016/j.jallcom.2006.08.014.

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CHEN, Yan, and LanHong DAI. "Inherent parameters governing ductile-brittle transition in metallic glasses." SCIENTIA SINICA Physica, Mechanica & Astronomica 42, no. 6 (2012): 551–59. http://dx.doi.org/10.1360/132012-296.

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To, Theany, Christian Gamst, Martin B. Østergaard, Lars R. Jensen, and Morten M. Smedskjaer. "Fracture energy of high-Poisson's ratio oxide glasses." Journal of Applied Physics 131, no. 24 (2022): 245105. http://dx.doi.org/10.1063/5.0096855.

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The apparent relationship between Poisson's ratio and fracture energy has been used to guide the discovery of ductile glasses with a brittle-to-ductile (BTD) transition at Poisson's ratio around 0.32. Most organic and metallic glasses possess Poisson's ratio above 0.32, and thus, feature fracture energy that is around three orders of magnitude higher than that of oxide glasses, which feature Poisson's ratio typically below 0.30. However, whether the BTD transition can also be observed in oxide glasses remains unknown due to the lack of fracture energy measurements on oxide glasses with high Poisson's ratio. In this work, we measure the fracture energy of six oxide glasses with high Poisson's ratio between 0.30 and 0.34. We find no clear relationship between the two parameters even in those that possess the same Poisson's ratio as ductile metallic glasses. This suggests that Poisson's ratio is not the main property to enhance the fracture energy of oxide glasses. To this end, we instead find a positive relation between fracture energy and Young's modulus of oxide glasses, and even for some metallic glasses, which could explain their absence of ductility.

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Gu, X. J., S. Joseph Poon, and Gary J. Shiflet. "Mechanical properties of iron-based bulk metallic glasses." Journal of Materials Research 22, no. 2 (2007): 344–51. http://dx.doi.org/10.1557/jmr.2007.0036.

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Iron-based bulk metallic glasses (BMGs) are characterized by high fracture strengths and elastic moduli, with some exhibiting fracture strengths near 4 GPa, 2–3 times those of conventional high-strength steels. Among the Fe-based BMGs, the non-ferromagnetic ones, designated “non-ferromagnetic amorphous steel alloys” by two of the present authors [S.J. Poon et al.: Appl. Phys. Lett.83, 1131 (2003)], have glass-forming ability high enough to form single-phase glassy rods with diameters reaching 16 mm. Fe-based BMGs designed for structural applications must exhibit some plasticity under compression. However, the role of alloy composition on plastic and brittle failures in metallic glasses is largely unknown. In view of a recently observed correlation that exists between plasticity and Poisson’s ratio for BMGs, compositional effects on plasticity and elastic properties in amorphous steels were investigated. For the new amorphous steels, fracture strengths as high as 4.4 GPa and plastic strains reaching ∼0.8% were measured. Plastic failure instead of brittle failure was observed as the Poisson’s ratio approached 0.32 from below. Investigation of the relationship between the elastic moduli of the alloys and those of the alloying elements revealed that interatomic interactions in addition to the elastic moduli of the alloying elements must be considered in designing ductile Fe-based BMGs. The prospects for attaining high fracture toughness in Fe-based BMGs are discussed in this article.

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Zhu, Z. W., S. J. Zheng, H. F. Zhang, et al. "Plasticity of bulk metallic glasses improved by controlling the solidification condition." Journal of Materials Research 23, no. 4 (2008): 941–48. http://dx.doi.org/10.1557/jmr.2008.0127.

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Different bulk metallic glasses (BMGs) were prepared in ductile Cu47.5Zr47.5Al5, Zr62Cu15.4Ni12.6Al10, and brittle Zr55Ni5Al10Cu30 alloys by controlling solidification conditions. The achieved microstructures were characterized by x-ray diffraction, differential scanning calorimetry, transmission electron microscopy, and synchrotron- based high-energy x-ray diffraction. Monolithic BMGs obtained by high-temperature injection casting are brittle, while BMGs bearing some nanocrystals with the size of 3 to 7 nm and 2 to 4 nm, obtained by low-temperature injection casting and in situ suction casting, respectively, exhibit good plasticity. It indicates that the microstructures of BMGs are closely affected by the solidification conditions. Controlling the solidification conditions could improve the plasticity of BMGs.

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18

Li, G., M. Q. Jiang, F. Jiang, L. He, and J. Sun. "Temperature-induced ductile-to-brittle transition of bulk metallic glasses." Applied Physics Letters 102, no. 17 (2013): 171901. http://dx.doi.org/10.1063/1.4803170.

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Yang, H. W., M. J. Tan, R. D. Li, and J. Q. Wang. "Effect of Minor V Addition on Al₈₈Y₇Fe₅Amorphous Alloys." Applied Mechanics and Materials 302 (February 2013): 76–81. http://dx.doi.org/10.4028/www.scientific.net/amm.302.76.

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The effect of the addition of 0.2-0.65 at% of V on the glass forming ability and mechanical properties of Al88Y7Fe5 alloy were investigated. The addition of V in this range had little effect on the glass forming ability of the alloy, but lowered the tensile strength of the amorphous ribbon. The fracture surface of Al88Y7Fe5 amorphous ribbons was typical vein pattern for ductile metallic glasses, however, that of the alloy with 0.5% V addition changed to two different regions, i.e., vein pattern region and smooth region. At high magnification, the smooth region was composed of nanometer sized corrugations, which is typical for brittle metallic glasses.

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Liu, Y. H., G. Wang, M. X. Pan, P. Yu, D. Q. Zhao, and W. H. Wang. "Deformation behaviors and mechanism of Ni–Co–Nb–Ta bulk metallic glasses with high strength and plasticity." Journal of Materials Research 22, no. 4 (2007): 869–75. http://dx.doi.org/10.1557/jmr.2007.0104.

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A class of Ni–Co–Nb–Ta bulk metallic glasses (BMGs) with a high glass-forming ability is developed. With proper compositional modification, the BMGs exhibit the enhanced plastic strain (up to 4%) and the ultimate strength (up to 3540 MPa). It is found that the interactions of shear bands such as intersecting, arresting, and branching, which normally are related to the plastic metallic glasses, can be observed both in the plastic and brittle Ni–Co–Nb–Ta BMGs. Obvious serrated flow behavior is observed during plastic deformation. The origins of the plasticity and the serrated flow in the Ni-based BMGs are analyzed in analogy to that in crystalline materials.

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Lagos, Miguel, and Raj Das. "Brittle and Ductile Character of Amorphous Solids." Advances in Applied Mathematics and Mechanics 8, no. 3 (2016): 485–98. http://dx.doi.org/10.4208/aamm.2013.m439.

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Abstract.Common silicate glasses are among the most brittle of the materials. However, on warming beyond the glass transition temperature Tg glass transforms into one of the most plastic known materials. Bulk metallic glasses exhibit similar phenomenology, indicating that it rests on the disordered structure instead on the nature of the chemical bonds. The micromechanics of a solid with bulk amorphous structure is examined in order to determine the most basic conditions the system must satisfy to be able of plastic flow. The equations for the macroscopic flow, consistent with the constrictions imposed at the atomic scale, prove that a randomly structured bulk material must be either a brittle solid or a liquid, but not a ductile solid. The theory permits to identify a single parameter determining the difference between the brittle solid and the liquid. However, the system is able of perfect ductility if the plastic flow proceeds in two dimensional plane layers that concentrate the strain. Insight is gained on the nature of the glass transition, and the phase occurring between glass transition and melting.

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Yang, W., Y. Zhao, L. Dou, et al. "Correlation between fractal dimension and strength of brittle bulk metallic glasses." Materials Science and Technology 30, no. 4 (2013): 447–50. http://dx.doi.org/10.1179/1743284713y.0000000374.

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Zeng, F., M. Q. Jiang, and L. H. Dai. "Dilatancy induced ductile–brittle transition of shear band in metallic glasses." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 474, no. 2212 (2018): 20170836. http://dx.doi.org/10.1098/rspa.2017.0836.

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Dilatancy-generated structural disordering, an inherent feature of metallic glasses (MGs), has been widely accepted as the physical mechanism for the primary origin and structural evolution of shear banding, as well as the resultant shear failure. However, it remains a great challenge to determine, to what degree of dilatation, a shear banding will evolve into a runaway shear failure. In this work, using in situ acoustic emission monitoring, we probe the dilatancy evolution at the different stages of individual shear band in MGs that underwent severely plastic deformation by the controlled cutting technology. A scaling law is revealed that the dilatancy in a shear band is linearly related to its evolution degree. A transition from ductile-to-brittle shear bands is observed, where the formers dominate stable serrated flow, and the latter lead to a runaway instability (catastrophe failure) of serrated flow. To uncover the underlying mechanics, we develop a theoretical model of shear-band evolution dynamics taking into account an atomic-scale deformation process. Our theoretical results agree with the experimental observations, and demonstrate that the atomic-scale volume expansion arises from an intrinsic shear-band evolution dynamics. Importantly, the onset of the ductile–brittle transition of shear banding is controlled by a critical dilatation.

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Pan, D., H. Guo, W. Zhang, A. Inoue, and M. W. Chen. "Temperature-induced anomalous brittle-to-ductile transition of bulk metallic glasses." Applied Physics Letters 99, no. 24 (2011): 241907. http://dx.doi.org/10.1063/1.3669508.

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Khusnutdinoff, Ramil M., and Anatolii V. Mokshin. "Elastic Properties and Glass Forming Ability of the Zr₅₀Cu₄₀Ag₁₀ Metallic Alloy." Solid State Phenomena 310 (September 2020): 145–49. http://dx.doi.org/10.4028/www.scientific.net/ssp.310.145.

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The elastic properties of the Zr50Cu40Ag10 metallic alloy, such as the bulk modulus B, the shear modulus G, the Young’s modulus E and the Poisson’s ratio σ, are investigated by molecular dynamics simulation in the temperature range T=250–2000 K and at an external pressure of p=1.0 bar. It is shown that the liquid–glass transition is accompanied by a considerable increase in the shear modulus G and the Young’s modulus E (by more than 50%). The temperature dependence of the Poisson’s ratio exhibits a sharp fall from typical values for metals of approximately 0.32–0.33 to low values (close to zero), which are characteristic for brittle bulk metallic glasses. Non-monotonic temperature dependence of the longitudinal and transverse sound velocity near the liquid-glass transition is also observed. The glass forming ability of the alloy is evaluated in terms of the fragility index m. Its value is m≈64 for the Zr50Cu40Ag10 metallic glass, which is in a good agreement with the experimental data for the Zr-based metallic glasses.

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Zhang, Z. F., J. Eckert, and L. Schultz. "Tensile and fatigue fracture mechanisms of a Zr-based bulk metallic glass." Journal of Materials Research 18, no. 2 (2003): 456–65. http://dx.doi.org/10.1557/jmr.2003.0058.

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The tensile and fatigue fracture behavior of Zr59Cu20Al10Ni8Ti3 bulk metallic glass was investigated. It was found that under tensile load the metallic glass always displays brittle shear fracture and the shear fracture plane makes an angle of θT (=54°) with respect to the stress axis, which obviously deviates from the maximum shear stress plane (45°). Under cyclic tension-tension loading, fatigue cracks first initiate along the localized shear bands on the specimen surface, then propagate along a plane basically perpendicular to the stress axis. Tensile fracture surface observations reveal that fracture first originates from some cores, then propagates in a radiate mode, leading to the formation of a veinlike structure and final failure. The fatigue fracture processes of the specimens undergo a propagation stage of fatigue cracks followed by catastrophic failure. Based on these results, a tensile fracture criterion for bulk metallic glasses is proposed by taking the effect of normal stress into account. It is suggested that both normal and shear stresses affect the fracture process of metallic glasses and cause the deviation of the fracture angle away from 45°

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Kumar, Golden, Tadakatsu Ohkubo, and Kazuhiro Hono. "Effect of melt temperature on the mechanical properties of bulk metallic glasses." Journal of Materials Research 24, no. 7 (2009): 2353–60. http://dx.doi.org/10.1557/jmr.2009.0272.

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The effect of melt temperature on the structure and mechanical properties of three Zr-based bulk metallic glasses (BMGs)—Zr62Cu17Ni13Al8, Zr55Cu20Ni10Al10Ti5, and Zr52.5Cu17.9Ni14.6Al10Ti5 (Vit105)—has been studied. The results show that the BMGs cast from higher melt temperature exhibit large plastic strains despite their amorphous structure. The samples become macroscopically brittle when the quenched-in crystals form an interconnected microstructure. In contrast to previous studies, there is no notable effect on the Poisson’s ratio (ν) and other elastic constants.

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Zakharenko, M., M. Babich, I. Yurgelevych, S. Zaichenko, and N. Perov. "Magnetic properties of the 3d-based metallic glasses at ductile-brittle transition." Le Journal de Physique IV 08, PR2 (1998): Pr2–99—Pr2–102. http://dx.doi.org/10.1051/jp4:1998223.

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Zhu, Bida, Minsheng Huang, and Zhenhuan Li. "Brittle to ductile transition of metallic glasses induced by embedding spherical nanovoids." Journal of Applied Physics 122, no. 21 (2017): 215108. http://dx.doi.org/10.1063/1.4997281.

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Wang, Q., J. J. Liu, Y. F. Ye, et al. "Universal secondary relaxation and unusual brittle-to-ductile transition in metallic glasses." Materials Today 20, no. 6 (2017): 293–300. http://dx.doi.org/10.1016/j.mattod.2017.05.007.

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Moitzi, F., D. Şopu, D. Holec, D. Perera, N. Mousseau, and J. Eckert. "Chemical bonding effects on the brittle-to-ductile transition in metallic glasses." Acta Materialia 188 (April 2020): 273–81. http://dx.doi.org/10.1016/j.actamat.2020.02.002.

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Jiang, F., M. Q. Jiang, H. F. Wang, Y. L. Zhao, L. He, and J. Sun. "Shear transformation zone volume determining ductile–brittle transition of bulk metallic glasses." Acta Materialia 59, no. 5 (2011): 2057–68. http://dx.doi.org/10.1016/j.actamat.2010.12.006.

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Ye, J. C., J. Lu, Y. Yang, and P. K. Liaw. "Study of the intrinsic ductile to brittle transition mechanism of metallic glasses." Acta Materialia 57, no. 20 (2009): 6037–46. http://dx.doi.org/10.1016/j.actamat.2009.08.029.

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Zhao, Jing, Jun Yi, Bo Huang, and Gang Wang. "Metallic Glassy Hollow Microfibers." Metals 12, no. 9 (2022): 1463. http://dx.doi.org/10.3390/met12091463.

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Hollow microfibers can be fabricated by using different materials such as metals and glass. The inner diameter of strong, tough, and conductive metallic tubes is on a submillimeter scale while that of quartz glass tubes made by thermoplastic forming can reach 5 nm. However, quartz glass tubes are brittle and nonconductive. Metallic glasses (MGs) are strong, tough, conductive, and have a thermoplastic forming ability. Theoretically, such materials can be used to produce strong, tough, and conductive hollow microfibers. Here, we report a method to fabricate MG hollow microfibers via thermoplastic forming bulk Pd43Cu27Ni10P20 MG tubes in their supercooled-liquid region. Uniform and smooth MG hollow microfibers with single and multiple channels were successfully fabricated by this method. Investigation of the heterogeneous microstructure of the fibers revealed their forming mechanism. The hollow microfibers might attract scientific interest and may have engineering applications in areas such as electrochemistry, microelectromechanical devices, medicine, and biology.

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Ozawa, Misaki, Ludovic Berthier, Giulio Biroli, Alberto Rosso, and Gilles Tarjus. "Random critical point separates brittle and ductile yielding transitions in amorphous materials." Proceedings of the National Academy of Sciences 115, no. 26 (2018): 6656–61. http://dx.doi.org/10.1073/pnas.1806156115.

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We combine an analytically solvable mean-field elasto-plastic model with molecular dynamics simulations of a generic glass former to demonstrate that, depending on their preparation protocol, amorphous materials can yield in two qualitatively distinct ways. We show that well-annealed systems yield in a discontinuous brittle way, as metallic and molecular glasses do. Yielding corresponds in this case to a first-order nonequilibrium phase transition. As the degree of annealing decreases, the first-order character becomes weaker and the transition terminates in a second-order critical point in the universality class of an Ising model in a random field. For even more poorly annealed systems, yielding becomes a smooth crossover, representative of the ductile rheological behavior generically observed in foams, emulsions, and colloidal glasses. Our results show that the variety of yielding behaviors found in amorphous materials does not necessarily result from the diversity of particle interactions or microscopic dynamics but is instead unified by carefully considering the role of the initial stability of the system.

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Ghaemi, Milad, Mehdi Jafary-Zadeh, Khoong Hong Khoo, and Huajian Gao. "Chemical affinity can govern notch-tip brittle-to-ductile transition in metallic glasses." Extreme Mechanics Letters 52 (April 2022): 101651. http://dx.doi.org/10.1016/j.eml.2022.101651.

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Dean, S. W., S. G. Zaichenko, A. M. Glezer, and V. P. Filippova. "Stability of Metallic Glasses: Criteria and Prediction of Ductile-Brittle Transition and Crystallization." Journal of ASTM International 9, no. 2 (2012): 103936. http://dx.doi.org/10.1520/jai103936.

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Jiang, M. Q., G. Wilde, F. Jiang, and L. H. Dai. "Understanding ductile-to-brittle transition of metallic glasses from shear transformation zone dilatation." Theoretical and Applied Mechanics Letters 5, no. 5 (2015): 200–204. http://dx.doi.org/10.1016/j.taml.2015.09.002.

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Singh, I., T. F. Guo, R. Narasimhan, and Y. W. Zhang. "Cavitation in brittle metallic glasses – Effects of stress state and distributed weak zones." International Journal of Solids and Structures 51, no. 25-26 (2014): 4373–85. http://dx.doi.org/10.1016/j.ijsolstr.2014.09.005.

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Yuan, X., D. Şopu, F. Moitzi, K. K. Song, and J. Eckert. "Intrinsic and extrinsic effects on the brittle-to-ductile transition in metallic glasses." Journal of Applied Physics 128, no. 12 (2020): 125102. http://dx.doi.org/10.1063/5.0020201.

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Cui, J. W., R. T. Qu, F. F. Wu, et al. "Shear band evolution during large plastic deformation of brittle and ductile metallic glasses." Philosophical Magazine Letters 90, no. 8 (2010): 573–79. http://dx.doi.org/10.1080/09500839.2010.484399.

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Liu, Z. Q., W. H. Wang, M. Q. Jiang, and Z. F. Zhang. "Intrinsic factor controlling the deformation and ductile-to-brittle transition of metallic glasses." Philosophical Magazine Letters 94, no. 10 (2014): 658–68. http://dx.doi.org/10.1080/09500839.2014.955548.

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Jeong, Ha Guk, Woo Jin Kim, Jung Chan Bae, Duk Jae Yoon, Seo Gou Choi, and Kyoung Hoan Na. "Hole Punching onto the Zr₆₅Al₁₀Ni₁₀Cu₁₅ BMG Sheet Fabricated by Squeeze Casting." Materials Science Forum 475-479 (January 2005): 3423–26. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.3423.

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Bulk metallic glass Zr65Al10Ni10Cu15 was fabricated in a sheet form with thickness 1.5 mm by a squeeze casting method. The structure of the as-cast Zr65Al10Ni10Cu15 sheet was confirmed to be fully amorphous. The sheet was punched into a blank under high hydrostatic pressure at room temperature. A round hole was created with a possible evidence for plastic-like deformation along the edge of rim. No visible cracks were observed around the hole. This result indicates that bulk metallic glasses, which are known to be very brittle at room temperature, can be deformed in a ductile mode under hydrostatic pressure condition. Hydrostatic pressure may suppress the formation and development of micro defects leading to ductile fracture

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Konstantinidis, Avraam A., Konstantinos Michos, and Elias C. Aifantis. "On the correct interpretation of compression experiments of micropillars produced by a focused ion beam." Journal of the Mechanical Behavior of Materials 25, no. 3-4 (2016): 83–87. http://dx.doi.org/10.1515/jmbm-2016-0009.

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AbstractThe modest goal of this short note is to shed some light on the correct interpretation of micro/nanopillar compression experiments. We propose a modification of the way the stress-strain response in such experiments is calculated, aiming at answering open questions pertaining to discrepancies between the elastic moduli values calculated through micropillar compression experiments with those of the bulk materials, as well as the brittle-to-ductile transition in bulk metallic glasses (BMGs) when the size of the pillars is reduced below a certain threshold value.

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Shamlaye, Karl F., Kevin J. Laws, and Michael Ferry. "Fabrication of Bulk Metallic Glass Composites at Low Processing Temperatures." Materials Science Forum 773-774 (November 2013): 461–65. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.461.

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Bulk metallic glasses (BMGs) are amorphous alloys that exhibit unique mechanical properties such as high strength due to their liquid-like structure in the vitreous solid state. While they usually exhibit low ductility, they can be toughened by incorporating secondary phase particles within the amorphous matrix via composite fabrication to generate amorphous metal matrix composites (MMCs). Traditional MMCs are fabricated at high temperature in the liquid state with tedious blending processes. This high temperature processing route often leads to unwanted reactions at the reinforcement/matrix interface, creating brittle intermetallic by-products and damaging the reinforcement. In the present work, novel bulk metallic glass composites (BMGCs) were fabricated at low processing temperatures via thermoplastic forming (TPF) above the glass transition temperature of the amorphous matrix. Here, the unique thermophysical features of the matrix material allow for TPF of composites in non-sacrificial moulds incorporating various types of reinforcement, via processing in the solid state at low temperatures (less than 200 °C), within a short timeframe (less than 10 minutes); this avoids the formation of brittle phases at the reinforcement/matrix interface leading to efficient bonding between particles and matrix, thereby creating a tough, low density composite material.

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Geissler, David, Jacob Grosse, Sven Donath, et al. "Granulation of Bulk Metallic Glass Forming Alloys as a Feedstock for Thermoplastic Forming and their Compaction into Bulk Samples." Materials Science Forum 879 (November 2016): 589–94. http://dx.doi.org/10.4028/www.scientific.net/msf.879.589.

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The various technologically important properties of metallic glasses are intimately connected to their amorphous structure that lacks the archetypical structural defects of polycrystalline metals and alloys, i.e. dislocations and grain boundaries. However, the amorphous structure also limits the application potential of this class of materials because of a macroscopically brittle behavior and size limitations. Consequently, with some exceptions, at least one dimension for technological products is limited to a few millimeters or even less. With the presented technological approach this drawback will be addressed. Our first results on several alloys show that with a dedicated instrumentation amorphous granulates can be successfully produced. By hot pressing in the supercooled liquid region, these granulates can be compacted into bulk shapes in the cm range. Further, due to the low viscosity of the supercooled liquid state, this technology disposes of a high formability. It is demonstrated that not only compact samples but also complex shapes in near net shape geometry can be produced. Results on the mechanical properties and microstructure will be discussed and related to important processing issues. Even though this technological approach does not directly address the second drawback of bulk metallic glasses, i.e. catastrophic failure due to highly localized shear bands, it is believed that this route offers possible pathways to improve this issue as well and, most important, to offer a technological route for implementing bulk metallic glasses into products of rather arbitrary shape and larger size.

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Østergaard, Martin B., Søren R. Hansen, Kacper Januchta, et al. "Revisiting the Dependence of Poisson’s Ratio on Liquid Fragility and Atomic Packing Density in Oxide Glasses." Materials 12, no. 15 (2019): 2439. http://dx.doi.org/10.3390/ma12152439.

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Poisson’s ratio (ν) defines a material’s propensity to laterally expand upon compression, or laterally shrink upon tension for non-auxetic materials. This fundamental metric has traditionally, in some fields, been assumed to be a material-independent constant, but it is clear that it varies with composition across glasses, ceramics, metals, and polymers. The intrinsically elastic metric has also been suggested to control a range of properties, even beyond the linear-elastic regime. Notably, metallic glasses show a striking brittle-to-ductile (BTD) transition for ν-values above ~0.32. The BTD transition has also been suggested to be valid for oxide glasses, but, unfortunately, direct prediction of Poisson’s ratio from chemical composition remains challenging. With the long-term goal to discover such high-ν oxide glasses, we here revisit whether previously proposed relationships between Poisson’s ratio and liquid fragility (m) and atomic packing density (Cg) hold for oxide glasses, since this would enable m and Cg to be used as surrogates for ν. To do so, we have performed an extensive literature review and synthesized new oxide glasses within the zinc borate and aluminoborate families that are found to exhibit high Poisson’s ratio values up to ~0.34. We are not able to unequivocally confirm the universality of the Novikov-Sokolov correlation between ν and m and that between ν and Cg for oxide glass-formers, nor for the organic, ionic, chalcogenide, halogenide, or metallic glasses. Despite significant scatter, we do, however, observe an overall increase in ν with increasing m and Cg, but it is clear that additional structural details besides m or Cg are needed to predict and understand the composition dependence of Poisson’s ratio. Finally, we also infer from literature data that, in addition to high ν, high Young’s modulus is also needed to obtain glasses with high fracture toughness.

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Zhao, Jiaxi, and Zhefeng Zhang. "On the stress-state dependent plasticity of brittle metallic glasses: Experiment, theory and simulation." Materials Science and Engineering: A 586 (December 2013): 123–32. http://dx.doi.org/10.1016/j.msea.2013.08.009.

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Yin, Jian, Xiujun Ma, and Zhijian Zhou. "Composition and size dependent brittle-to-malleable transitions of Mg-based bulk metallic glasses." Materials Science and Engineering: A 605 (May 2014): 286–93. http://dx.doi.org/10.1016/j.msea.2014.03.065.

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Wei, Yujie. "The intrinsic and extrinsic factors for brittle-to-ductile transition in bulk metallic glasses." Theoretical and Applied Fracture Mechanics 71 (June 2014): 76–78. http://dx.doi.org/10.1016/j.tafmec.2014.06.001.

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