Fe-based bulk metallic glass with high plasticity

Yao, Kefu; Zhang, C. Q.

doi:10.1063/1.2437722

Cited by 156 publications

(81 citation statements)

References 28 publications

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“…Most of the BGAs under compression show some plasticity before failure at room temperature, while under tension, they display nearly zero tensile elongation. Although numerous efforts have been directed toward improving the ductility of BGAs or bulk glassy alloy matrix composites (BGACs) at room temperature, [8][9][10][11][12][13] little is known about mechanical properties of BGAs and BGACs at cryogenic temperatures.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Tensile Strength and Plasticity of Zr-Cu-Al Bulk Glassy Alloys at Cryogenic Temperatures

et al. 2009

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No data are available about mechanical behavior of bulk glassy alloys (BGAs) in tension at cryogenic temperatures. In this study, we investigated the effect of temperature on the mechanical behavior of ternary eutectic and hypoeutectic Zr-Cu-Al BGAs fabricated by an arc tilt casting method. Tensile tests were performed for the BGA plates with gauge dimensions of 5 mm in length, 1.2 mm in width and 0.5 mm in thickness at temperatures of 295, 223, 173 and 77 K, at an initial strain rate of 5 Â 10 À4 s À1 . Measurements of elastic parameters were also made at temperatures from 97 to 342 K by an ultrasonic pulse method. It is found that the tensile strength and elongation for both BGAs increase with decreasing testing temperature, which is reported for the first time under a tensile condition. At cryogenic temperatures, the tensile elongation of the hypoeutectic Zr 59 Cu 31 Al 10 BGA tends to be higher than that of the eutectic Zr 50 Cu 40 Al 10 BGA, although the difference is small. Multiple shear bands are observed on the side surface deformed at lower temperatures. The Young's and shear moduli, and Debye temperature monotonically increase with decreasing temperature. This indicates that the BGA becomes rigid and the effective atomic distance decreases at cryogenic temperatures, leading to the increase of the tensile strength at cryogenic temperatures.

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Section: Introductionmentioning

confidence: 99%

Enhanced Tensile Strength and Plasticity of Zr-Cu-Al Bulk Glassy Alloys at Cryogenic Temperatures

et al. 2009

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“…(1) where σ : yield strength and A : cross sectional area. Generally, the yield strength of Fe-BMG has been reported to be about 2GPa [1] and [2]. Based on the above equation, the yield strengths of laser cladding and GTAW coated specimens were about 2.0 and 1.7 GPa, respectively.…”

Section: Mechanical Propertiesmentioning

confidence: 93%

Evaluation of Mechanical Characteristics and Microstructure of Surface Hardness Coating by Laser Cladding

Lee¹,

Lim²,

Park

2015

Advanced Science and Technology Letters

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Abstract. This study evaluated the mechanical properties and the microstructure of a surface hardness coating layer formed by laser cladding using a Bulk Metallic Glass (BMG) wire. The mechanical properties were measured by tensile strength test and micro-hardness test; microstructure and grain structure were analyzed by using a high-resolution scanning electron microscope and a transmission electron microscope. Surface coating was carried out by laser cladding and the GTAW process. The tensile strengths of the laser-cladded and GTAW coating layers were 2.0GPa and 1.7GPa, respectively. The tensile strength and micro hardness of the laser-cladded coating layer were about 15% and 14.3% higher than those of the GTAW coating layer, respectively. The laser-cladded coating layer showed finer grains and fewer dendrites due to their reduced distribution. The microstructure of the BMG coated layer showed a mix of α-Fe phase and amorphous phase.Keywords: Welding, GTAW, Laser cladding, BMG, Surface hardness coating, G.1-AW Mechanical PropertiesAs shown in Fig.1(a), the yield strengths of STS316L, GTAW, and Laser Cladding coated specimens were 292.1, 360.7, and 378.9 MPa, and the tensile strengths were 591.8, 534.8, and 568.9 MPa, respectively. The tensile strength of the substrate (STS316L) was higher than those of GTAW and Laser Cladding coated specimens by 9.63% and 3.86%, respectively, but the yield strengths of GTAW and laser cladding coated specimens were higher than that of the substrate (STS316L) by 19.02% and 22.91%, respectively.Generally, yield strength is a more important mechanical property than tensile strength for metals used in structural products. This is because elastic deformation does not affect a product's appearance, but plastic deformation changes a product's size or appearance, decreasing a product's value. The yield strength of the coating layer can be obtained by using Eq. (1) as follows.

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“…This would probably be the main reason why some of the MGs in Table 1 possess pronounced compressive plasticity, but rather poor tensile plasticity. If we were able to neglect the sample ends effects in the mechanical tests, the intervention of shear band propagation would be dominantly determined by the stress gradient induced by the intrinsic heterogeneous structure of MGs [1,54,55]. This is supported by the fact that MGs with pronounced free volume concentration [56] shows extraordinary plasticity by shear band multiplication.…”

Section: Metallic Glassesmentioning

confidence: 99%

An index of shear banding susceptibility of metallic glasses

2016

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a b s t r a c tBy virtue of instability analysis, an index of shear banding susceptibility of metallic glasses (MGs): the critical strain localization factor to initiate an embryonic shear band:c ¼ g b =g m (g b shear strain in the embryonic shear band and g m in the matrix) is derived in analogue to the emergence of geometrically necessary dislocations (GND) in crystals. Physical properties, like Poisson ratioy, Young's modulus E and the surface energy density z, are explicitly incorporated into the formulae of c with which the origin of the plasticity of MGs are unraveled.

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Fe-based bulk metallic glass with high plasticity

Cited by 156 publications

References 28 publications

Enhanced Tensile Strength and Plasticity of Zr-Cu-Al Bulk Glassy Alloys at Cryogenic Temperatures

Enhanced Tensile Strength and Plasticity of Zr-Cu-Al Bulk Glassy Alloys at Cryogenic Temperatures

Evaluation of Mechanical Characteristics and Microstructure of Surface Hardness Coating by Laser Cladding

An index of shear banding susceptibility of metallic glasses

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