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Characterization of nanoscale structural heterogeneity in an amorphous alloy by synchrotron small angle X-ray scattering
Alternative Title小角X射线散射表征非晶合金纳米尺度结构非均匀
Sun, X; Mo G(默广); Mo, G; Zhao, LZ; Dai, LH; Wu, ZH; Jiang, MQ; Wu ZH(吴忠华)
2017
Source PublicationACTA PHYSICA SINICA物理学报
ISSN1000-3290
Volume66Issue:17Pages:176109
SubtypeArticle
AbstractAmorphous alloys are the glassy solids that are formed through the glass transition of high-temperature melts. They therefore inherit the long-ranger disorders of melts and many quenched-in defects such as free volume. This inevitably leads to structural heterogeneity on a nanoscale that is believed to be as fertile sites for initiating relaxation and flow. However, due to limitations of spatiotemporal measurements, experimental characterization of the nanoscale structural heterogeneity in amorphous alloys has faced a great challenges. In this paper, an in-situ tensile testing setup with synchrotron small angle X-ray scattering is designed for a Zr-based (Vitreloy 1) amorphous alloy. By the small angle X-ray scattering, the structural heterogeneity of the Vitreloy 1 amorphous alloy can be described by the fluctuation of electron density. The small angle scattering images are recorded with the charge coupled device (CCD) detector, and then are azimuthally integrated into the one-dimensional scattering intensity curves using the FIT2D software. We apply the Porod law, Guinier law and Debye law to the obtained scattering intensity curves, and attempt to obtain the information about structural heterogeneity in the Vitreloy 1 amorphous alloy at different stress levels. The results indicate that the scattering intensity curve of the Vitreloy 1 amorphous alloy exhibits the positive deviation of Porod law. This observation proves that the amorphous alloy belongs to the non-ideal two-phase system, corresponding to the complicated spatial distribution between soft/ liquid-like and hard/ solid-like phases. According to the Porod's law, it is revealed that the diffuse interface exists between the two phases, associated with the density fluctuations in either of phases. Furthermore, we demonstrate that different scatterers coexist in the amorphous alloy and their characteristic sizes measured by the radius of gyration are mainly distributed between 0.8 nm and 1.6 nm. It deserves to note that the range of radii of gyration of scatterers are close to the equivalent sizes (1.3-1.9 nm) of shear transformation zones (STZs) for plastic flow in amorphous alloys. In addition, the shape of scatterer is far from a sphere, reminiscent of STZ activation regions of flat discs. It is therefore concluded that the scatterers with larger gyration radius correspond to the soft regions for the potential STZs, while those with smaller gyration radius correspond to the hard regions with lower free volume concentration. Finally, based on the correlation function defined by Debye, we analyze the correlation of electron density fluctuation between two arbitrary scatterers. The result indicates that the nanoscale scatterers in the amorphous alloy are strongly correlated only within a range of about 1 nm, which is consistent with the short-range ordered and long-range disordered structural features of the amorphous alloy. The image of the nanoscale heterogeneous structures characterized by the small angle X-ray scattering is almost not changed in the elastic deformation stage of the amorphous alloy. The present findings increase our understanding of the nanoscale structural heterogeneity in amorphous alloys, which is an important step to describe glass flow and relaxation.
Keywordamorphous alloys nanoscale structural heterogeneity small angle X-ray scattering deformation
DOI10.7498/aps.66.176109
WOS KeywordSHEAR TRANSFORMATION ZONES ; BULK METALLIC GLASSES ; PLASTIC-DEFORMATION ; SOLIDS ; DYNAMICS ; ORIGIN ; FLOW
Indexed BySCI ; EI ; SCOPUS ; CSCD
Language中文
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000412842000009
CSCD IDCSCD:6123508
EI Accession Number20174704422283
EI KeywordsCarrier concentration - Charge coupled devices - Deformation - Electron density measurement - Free volume - Glass - Glass transition - Nanotechnology - Shear flow - Tensile testing - X ray scattering
EI Classification Number423 Non Mechanical Properties and Tests of Building Materials - 531 Metallurgy and Metallography - 631.1 Fluid Flow, General - 701.1 Electricity: Basic Concepts and Phenomena - 714.2 Semiconductor Devices and Integrated Circuits - 761 Nanotechnology - 802.3 Chemical Operations - 812.3 Glass - 815 Polymers and Polymer Science - 932.1 High Energy Physics
Citation statistics
Cited Times:4[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/285294
Collection多学科研究中心
中国科学院高能物理研究所_中国散裂中子源
Affiliation中国科学院高能物理研究所
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Sun, X,Mo G,Mo, G,et al. Characterization of nanoscale structural heterogeneity in an amorphous alloy by synchrotron small angle X-ray scattering[J]. ACTA PHYSICA SINICA物理学报,2017,66(17):176109.
APA Sun, X.,默广.,Mo, G.,Zhao, LZ.,Dai, LH.,...&吴忠华.(2017).Characterization of nanoscale structural heterogeneity in an amorphous alloy by synchrotron small angle X-ray scattering.ACTA PHYSICA SINICA物理学报,66(17),176109.
MLA Sun, X,et al."Characterization of nanoscale structural heterogeneity in an amorphous alloy by synchrotron small angle X-ray scattering".ACTA PHYSICA SINICA物理学报 66.17(2017):176109.
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