Ductile Fe-Based BMGs with High Glass Forming Ability and High Strength

Liu, Fengjuan; Yang, Quanwen; Pang, Shujie; Ma, Chao; Zhang, Tao

doi:10.2320/matertrans.mra2007186

Cited by 25 publications

(7 citation statements)

References 26 publications

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“…This phenomenon is considered to be related to the bonding nature of the constituent elements proposed by Liu et al [19]. The mixing enthalpies between metalloid elements and Ni atomic pairs are smaller than the Fe pairs (e.g., the mixing enthalpy for Ni-P, Ni-C, and Ni-B pairs is −34.5, −39, −24 kJ/mol, respectively, but the mixing enthalpy for Fe-P, Fe-C, and Fe-B atomic pairs are −39.5, −50, −26 kJ/mol, respectively).…”

Section: Tablementioning

confidence: 97%

Enhancement of plasticity of Fe-based bulk metallic glass by Ni substitution for Fe

Guo

Zhang

et al. 2010

Journal of Alloys and Compounds

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Section: Tablementioning

confidence: 97%

Enhancement of plasticity of Fe-based bulk metallic glass by Ni substitution for Fe

Guo

Zhang

et al. 2010

Journal of Alloys and Compounds

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“…19 The stress intensity factor for the cylindrical configuration was evaluated using the analysis by Murakami. 20 Considering that the average ligament size in the present specimens was ϳ1 mm, and taking the yield strength for this family of glasses to be ϳ3200 MPa, 5,14,16,17 nominally plane strain conditions can be assumed for fracture toughness measurements of Ͻ60 MPa m 1/2 , as obtained here. Nevertheless, since sharp precracks ahead of the notches were not introduced in the present specimens the measured stress intensity factors are not standard K IC values.…”

mentioning

confidence: 99%

“…Specifically, they demonstrated that alloys in the system ͑Fe,Co,Cr,Mo,Ga͒-P-͑C,B͒ form glassy rods with diameters up to 4 mm. More recently, the alloy systems of ͑Fe,Mo͒-P-͑C,B͒, 5,14 ͑Fe,Mo͒-͑P,Si͒-͑C,B͒, 15 ͑Fe,Cr,Mo͒-P-͑C,B͒, 5 ͑Fe,Ni,Mo͒-P-͑C,B͒, 16 and ͑Fe,Co,Mo͒-͑P,Si͒-͑C,B͒ ͑Ref. 17͒ have been explored, all of which were found to form bulk glasses with critical rod diameters between 2 and 6 mm.…”

mentioning

confidence: 99%

Glassy steel optimized for glass-forming ability and toughness

Demetriou¹,

Kaltenboeck²,

Suh³

et al. 2009

Applied Physics Letters

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An alloy development strategy coupled with toughness assessments and ultrasonic measurements is implemented to design a series of iron-based glass-forming alloys that demonstrate improved glass-forming ability and toughness. The combination of good glass-forming ability and high toughness demonstrated by the present alloys is uncommon in Fe-based systems, and is attributed to the ability of these compositions to form stable glass configurations associated with low activation barriers for shear flow, which tend to promote plastic flow and give rise to a toughness higher than other known Fe-based bulk-glass-forming systems. © 2009 American Institute of Physics. ͓DOI: 10.1063/1.3184792͔The remarkably high strength, modulus, and hardness of iron-based glasses, combined with their low cost, prompted an effort over the past five years to design amorphous steel suitable for structural applications. The development effort yielded glasses with critical rod diameters as large as 12 mm 1,2 and strengths in excess of 4 GPa. 3 These low-cost ultrastrong materials however exhibit fracture toughness values as low as 3 MPa m 1/2 , 4 well below acceptable toughness limits for structural materials. The low toughness has been linked to their elastic constants, specifically their high shear modulus, 5 which for some compositions exceeds 80 GPa. 3 Recent efforts to toughen these alloys by altering their composition yielded glasses with lower shear moduli ͑below 70 GPa͒, which exhibit improved notch toughness ͑as high as 50 MPa m 1/2 ͒ but compromised glass-forming ability ͑criti-cal rod diameters less than 3 mm͒. 5,6 In this study, we implement an alloy development strategy coupled with toughness assessment and ultrasonic measurements to design glassy steel alloys with particularly low shear moduli ͑below 60 GPa͒ that demonstrate high toughness ͑notch toughness in excess of 50 MPa m 1/2 ͒ yet adequate glass-forming ability ͑critical rod diameters as large as 6 mm͒.The link between the high shear modulus and the low toughness of Fe-based glasses rests on the argument that a high shear modulus implies a high resistance to relax stress by shear flow. In turn, this promotes cavitation and early fracture and thus limits toughness. Using a Frenkel-like analysis to study cooperative shearing, Johnson and Samwer 7 arrived at a quantitative expression for the activation energy for shear flow, that is, the energy barrier to initiate plastic flow. Specifically, a relationship was proposed between the shear-flow barrier W and the shear modulus G for a frozen-in atomic configuration at the glass transition temperature T g , given by W͑T g ͒ ϰ G͑T g ͒v m ͑T g ͒, 7 where v m is the molar volume, which usually varies little within an alloy family. Aside from their high G, the brittle behavior of these glasses can also be predicted by their high T g , which for some compositions exceeds 600°C. 1,2 The glass transition temperature is also a measure of W͑T g ͒, since the requirement for the liquid viscosity at T g ͑10 12 Pa s͒ gives W͑T g ͒Ϸ37RT g ....

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“…2 In 1995, Inoue and his co-workers first synthesized Fe-based bulk metallic glass (BMG) in the Fe−(Al,Ga)−(P,C,B) system. 3 Since then, a great number of ferromagnetic BMGs have been developed, [4][5][6][7][8][9][10][11] which is encouraging for enlarging the application fields of amorphous soft magnetic materials. Nevertheless, it is not easy to achieve a good combination of the desired GFA and saturation magnetic flux density (B s ) in one glassy alloy, because the addition of glass-forming elements decreases the Fe content, resulting in a decrease in B s .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of glass-forming ability of Fe-based bulk metallic glasses with high saturation magnetic flux density

2012

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The effects of substituting Fe with Ni on thermal properties, glass-forming ability (GFA) and magnetic properties of Fe76-xNixMo3.5P10C4B4Si2.5 (x = 0−30 at.%) alloys were investigated in detail. The breadth of the supercooled liquid region was found to gradually increase from 42 to 55 K with increasing Ni content to 30 at.%. When x = 5 at.%, the alloy composition approached a eutectic point, resulting in an increase in GFA. As a result, FeNiMoPCBSi bulk metallic glasses with critical diameters up to 5.5 mm were successfully synthesized by copper mold casting. These glassy alloys exhibit a high saturation magnetic flux density of 0.75−1.21 T and excellent soft magnetic properties, i.e., low coercive force of 1.1−2.0 A/m, and high effective permeability of 14400−19700 at 1 kHz under a field of 1 A/m. The reasons for the high stability of the supercooled liquid, and the high GFA as well as excellent soft magnetic properties are discussed in this article

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Ductile Fe-Based BMGs with High Glass Forming Ability and High Strength

Cited by 25 publications

References 26 publications

Enhancement of plasticity of Fe-based bulk metallic glass by Ni substitution for Fe

Enhancement of plasticity of Fe-based bulk metallic glass by Ni substitution for Fe

Glassy steel optimized for glass-forming ability and toughness

Enhancement of glass-forming ability of Fe-based bulk metallic glasses with high saturation magnetic flux density

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