Atomic scale calculation of the free volume in Zr2Ni metallic glass

Li, F.; Liu, X.J.; Hou, Huaiyu; Chen, G.; Chen, G.L.; Li, M.

doi:10.1016/j.intermet.2008.07.013

Cited by 29 publications

(13 citation statements)

References 43 publications

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“…As a result, the atoms in the second coordination shell can move apart more freely in the tensile direction (r 2 0 ¼ r 2 þ Ár), even in the lesser elongated first coordination shell. It should be mentioned that the free volume in BMGs 22) is insufficient for large deformation. Hence, the atomic movement shown in Fig.…”

Section: Direct-space Methodsmentioning

confidence: 99%

Atomic-Scale Characterization of Elastic Deformation of Zr-Based Metallic Glass under Tensile Stress

et al. 2010

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In-situ observation of elastic deformation behaviors of Zr 55 Al 10 Ni 5 Cu 30 bulk metallic glass under tensile stress was carried out using the high-energy X-ray scattering method. Two analytical procedures-the reciprocal-space method and direct-space method-were applied. The reciprocal-space method, used for the estimation of an apparent atomic spacing, can evaluate the strain in the range of several nanometers. We found that this method yields a large Young's modulus (115 GPa) and a small Poisson's ratio (0.32), as compared to the macroscopic values of 101 GPa and 0.38, respectively. Thus, the macroscopic deformation is larger than the microscopic deformation characterized by the X-ray scattering method. This feature indicates the possibility of inhomogeneous regions with weakly bonded structures existing locally in the glassy structure and acting as significant deformation sites in the elastic stage. The direct-space method suggests that the Zr-Zr nearest pair has a higher sensitivity to an applied stress than the Zr-Cu pair. Moreover, both the nearest pairs in the first shell (r < 0:4 nm) exhibit a slight distortion, as compared with the deformation observed in the second or higher coordination shell (r > 0:4 nm). We explain this deformability gap with the hypothesis that the free volume in the first coordination shell assists the glide of atoms. This results in a larger strain in the second or higher coordination shell than in the first shell.

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Section: Direct-space Methodsmentioning

confidence: 99%

Atomic-Scale Characterization of Elastic Deformation of Zr-Based Metallic Glass under Tensile Stress

et al. 2010

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“…4, the first-stage parabolic rate constant increases almost monotonously with temperature, this can be explained as follows. Due to the existence of excess free volume in the amorphous substrate [25][26][27], it is convenient for O anions to travel through. With temperature increasing, the O anions become more active and diffuse faster into the substrate; therefore the oxidation rate is improved.…”

Section: Oxidation Kineticsmentioning

confidence: 99%

Air oxidation of a Zr55Cu30Al10Ni5 bulk metallic glass at its super cooled liquid state

et al. 2014

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“…For the present system we do not find that the malleability of investigated BMGs is directly correlated with GFA, either. It is particularly true that BMG with a denser atomic packing leads to a higher GFA, thereby having a less amount of free volume [37]. As seen in Fig.…”

Section: Discussionmentioning

confidence: 89%

Investigations of compressive strength on Cu-Hf-Al bulk metallic glasses: Compositional dependence of malleability and Weibull statistics

Jia¹,

Zhu²,

Zuo³

et al. 2011

Intermetallics

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Atomic scale calculation of the free volume in Zr2Ni metallic glass

Cited by 29 publications

References 43 publications

Atomic-Scale Characterization of Elastic Deformation of Zr-Based Metallic Glass under Tensile Stress

Atomic-Scale Characterization of Elastic Deformation of Zr-Based Metallic Glass under Tensile Stress

Air oxidation of a Zr55Cu30Al10Ni5 bulk metallic glass at its super cooled liquid state

Investigations of compressive strength on Cu-Hf-Al bulk metallic glasses: Compositional dependence of malleability and Weibull statistics

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