Processing of bulk metallic glasses with high strength and large compressive plasticity in Cu50Zr50

Zhu, Zhengwang; Zhang, H.F.; Sun, Wei; Ding, B.Z.; Hu, Z. Q.

doi:10.1016/j.scriptamat.2005.11.063

Cited by 89 publications

(48 citation statements)

References 25 publications

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“…A stress-induced 'diffusion less shear transformation' from parent austenite to martensite in CuZr 18,19) and Ti(Ni,Cu) 26) B2 phases has already been reported. All these alloys either with micrometer-size, 20) 10 nm size B2 phase, 14) 5 nm size clustered glassy microstructure (present investigation), or medium-range ordered structure 27) exhibit strain hardening and ductility. We have surveyed a large number of ductile BMGs having alloy compositions near to the martensite alloy compositions (Table 1).…”

Section: Resultsmentioning

confidence: 65%

Ductile Metallic Glasses in Supercooled Martensitic Alloys

Das¹,

Kim

Xu³

et al. 2006

Mater. Trans.

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We report ductile bulk metallic glasses based on martensitic alloys. The slowly cooled specimens contain a mixture of parent 'austenite' and martensite phase. The slightly faster cooled bulk metallic glasses with 2-5 nm sized 'austenite'-like crystalline cluster reveal high strength and large ductility (16%). Shear bands propagate in a slither mode in this spatially inhomogeneous glassy structure and undergo considerable 'thickening' from 5-25 nm. A 'stress induced displacive transformation' is proposed to be responsible for both plasticity and work-hardeninglike behavior of these 'M-Glasses'.

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Section: Resultsmentioning

confidence: 65%

Ductile Metallic Glasses in Supercooled Martensitic Alloys

Das¹,

Kim

Xu³

et al. 2006

Mater. Trans.

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“…Thirdly, Cu-Zr binary and some Cu-Zr based MGs exhibit a combination of high strengths and notable plasticity [9,10], making these alloys attractive for engineering applications. All these factors make the Cu-Zr binary alloys a good prototype model system to investigate the structure-property relationships in MGs.…”

Section: Introductionmentioning

confidence: 99%

Impact of deformation on the atomic structures and dynamics of a Cu-Zr metallic glass: A molecular dynamics study

et al. 2014

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Despite numerous studies on the atomic structures of Cu-Zr metallic glasses (MGs), their inherent structural ordering, e.g., medium range order (MRO), remains difficult to describe. Specifically lacking is our understanding of how the MRO responds to deformation and the associated changes in atomic mobility. In this study, we focus on the impact of deformation on MRO and associated effect on diffusion in a well-relaxed Cu 64.5 Zr 35.5 MG by molecular dynamics simulations. The Cu-Zr MG exhibits a larger elastic limit of 0.035 and a yield stress of 3.5 GPa. Cluster alignment method was employed to characterize the icosahedral short range order (ISRO) and Bergman type medium range order (BMRO) in the models upon loading and unloading. From this analysis, we find the disruption of both ISRO and BMRO occurs as the strain reaches about 0.02, well below the elastic limit. Within the elastic limit, the total fractions of ISRO or BMRO can be fully recovered upon unloading. The diffusivity increases 6-8 times in regions undergoing plastic deformation, which is due to the dramatic disruption of the ISRO and BMRO. By mapping the spatial distributions of the mobile atoms, we demonstrate the increase in atomic mobility is due to the extended regions of disrupted ISRO and more importantly BMRO.

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“…They have large differences in physical properties such as glass-forming ability (GFA). In detail, since the critical casting size is an important indicator of GFA, we can say that Zr48Cu45Al7 has a higher GFA than Zr50Cu50, considering the fact that Zr50Cu50 has a critical casting size not more than 2 mm in diameter [44], while such value is enhanced up to 6 mm in Zr48Cu45Al7 [45].…”

Section: A Introductionmentioning

confidence: 99%

Detecting Structural Features in Metallic Glass via Synchrotron Radiation Experiments Combined with Simulations

Guo

Luo

et al. 2015

Metals

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Abstract:Revealing the essential structural features of metallic glasses (MGs) will enhance the understanding of glass-forming mechanisms. In this work, a feasible scheme is provided where we performed the state-of-the-art synchrotron-radiation based experiments combined with simulations to investigate the microstructures of ZrCu amorphous compositions. It is revealed that in order to stabilize the amorphous state and optimize the topological and chemical distribution, besides the icosahedral or icosahedral-like clusters, other types of clusters also participate in the formation of the microstructure in MGs. This cluster-level co-existing feature may be popular in this class of glassy materials.

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Processing of bulk metallic glasses with high strength and large compressive plasticity in Cu50Zr50

Cited by 89 publications

References 25 publications

Ductile Metallic Glasses in Supercooled Martensitic Alloys

Ductile Metallic Glasses in Supercooled Martensitic Alloys

Impact of deformation on the atomic structures and dynamics of a Cu-Zr metallic glass: A molecular dynamics study

Detecting Structural Features in Metallic Glass via Synchrotron Radiation Experiments Combined with Simulations

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