A strategy for designing bulk metallic glass composites with excellent work-hardening and large tensile ductility

Zhai, Hua; Wang, Haifeng; Liu, Feng

doi:10.1016/j.jallcom.2016.05.290

Cited by 66 publications

(18 citation statements)

References 47 publications

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“…Figure 5A shows representative tensile stress-strain curves of flat dog bone–shaped samples with a width of 2.0 to 4.5 μm and a thickness of 2.0 to 3.5 μm. The nano-CACs display a high yield strength of 1.80 ± 0.1 GPa, an ultimate tensile strength of 2.30 ± 0.1 GPa, and a good uniform tensile strain of 7.0 ± 1.0%, superior to micro-sized dendrite-reinforced TiZr- and CuZr-based micro-CACs ( 34 – 43 ), as illustrated in Fig. 5B .…”

Section: Resultsmentioning

confidence: 99%

Enhancing strength and ductility via crystalline-amorphous nanoarchitectures in TiZr-based alloys

Ming

Zhu

et al. 2022

Sci. Adv.

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Crystalline-amorphous composite have the potential to achieve high strength and high ductility through manipulation of their microstructures. Here, we fabricate a TiZr-based alloy with micrometer-size equiaxed grains that are made up of three-dimensional bicontinuous crystalline-amorphous nanoarchitectures (3D-BCANs). In situ tension and compression tests reveal that the BCANs exhibit enhanced ductility and strain hardening capability compared to both amorphous and crystalline phases, which impart ultra-high yield strength (~1.80 GPa), ultimate tensile strength (~2.3 GPa), and large uniform ductility (~7.0%) into the TiZr-based alloy. Experiments combined with finite element simulations reveal the synergetic deformation mechanisms; i.e., the amorphous phase imposes extra strain hardening to crystalline domains while crystalline domains prevent the premature shear localization in the amorphous phases. These mechanisms endow our material with an effective strength–ductility–strain hardening combination.

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Section: Resultsmentioning

confidence: 99%

Enhancing strength and ductility via crystalline-amorphous nanoarchitectures in TiZr-based alloys

Ming

Zhu

et al. 2022

Sci. Adv.

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“…1. Bulk metallic glasses are promising structural materials because of their excellent properties such as high yield strength, excellent corrosion resistance, and low stiffness [41][42][43][44] . But at the same time, BMGs lack ductility and always fail in an apparently brittle manner, which seriously limits their applications [45][46][47][48] .…”

Section: Introductionmentioning

confidence: 99%

Role of a fractal shape of the inclusions on acoustic attenuation in a nanocomposite

et al. 2021

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Nanophononic materials are promising to control the transport of sound in the GHz range and heat in the THz range. Here we are interested in the influence of a dendritic shape of inclusion on acoustic attenuation. We investigate a Finite Element numerical simulation of the transient propagation of an acoustic wavepacket in 2D nanophononic materials with circular or dendritic inclusions periodically distributed in matrix. By measuring the penetration length, diffusivity, and instantaneous wave velocity, we find that the multibranching tree-like form of dendrites provides a continuous source of phonon-interface scattering leading to an increasing acoustic attenuation. When the wavelength is far less than the inter-inclusion distance, we report a strong attenuation process in the dendritic case which can be fitted by a compressed exponential function with β > 1.

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“…Compared with the crystalline materials, bulk metallic glasses (BMGs) because of their unique disordered microstructure exhibit unique physical and chemical properties, such as high hardness, high strength and high resistance to corrosion, thus making them as promising engineering structural materials [1][2][3][4]. Due to the combination of high hardness and high strength, BMGs are expected to have superior wear resistance [5,6].…”

Section: Introductionmentioning

confidence: 99%

Improving the wear performance of a commercial Vit 1 amorphous alloy by a cryogenic cycling treatment

Zhai

et al. 2021

J Mater Sci

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A commercial Vit 1 amorphous alloy was processed by a cryogenic cycling treatment of different times. The phase structure, thermal, mechanical and wear properties were studied. Although the cryogenic cycling treatment does not change significantly the phase structure, it promotes thermal rejuvenation, i.e., the heterogeneity of the internal structure. The heterogeneous structure promotes initiation of multiple shear bands within the amorphous alloy to bring about dissipative deformation energy, which in turn increases the plasticity. Thanks to the plasticization, the wear properties were significantly improved by the cryogenic cycling treatment. In particular, the wear rate after 30 cycles of treatment (7.55 9 10 -5 mm 3 /N m) decreases to about one third of the as-cast alloy (22.75 9 10 -5 mm 3 /N m). The reason is that with the increase in plasticity, the wear mechanism of Vit 1 BMG changes from three-body abrasive wear to a synergistic mechanism of three-body abrasive wear and oxidative wear. Therefore, improving the plasticity of amorphous alloys by the cryogenic cycling treatment could be an effectively strategy to enhance the wear perfermance.

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A strategy for designing bulk metallic glass composites with excellent work-hardening and large tensile ductility

Cited by 66 publications

References 47 publications

Enhancing strength and ductility via crystalline-amorphous nanoarchitectures in TiZr-based alloys

Enhancing strength and ductility via crystalline-amorphous nanoarchitectures in TiZr-based alloys

Role of a fractal shape of the inclusions on acoustic attenuation in a nanocomposite

Improving the wear performance of a commercial Vit 1 amorphous alloy by a cryogenic cycling treatment

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