The crystal fraction determination of the nanocrystalline phase transformed from the Fe-base amorphous matrix using EXAFS

Structural Relaxation and Crystallization of a Zr<SUB>44</SUB>Ti<SUB>11</SUB>Cu<SUB>9.8</SUB>Ni<SUB>10.2</SUB>Be<SUB>25</SUB> Bulk Metallic Glass

“…45) The R p values for the main peak saturate at 0.279 nm after 15 min annealing implying a saturation of structural relaxation after 15 min of annealing at 688 K. On the other hand, both the continuous increase of main radial distribution peak height with increasing annealing time and the separation of the overlap between the main and the rightnearest peaks for the specimen annealed for 45 min at 688 K could give evidence for a distinct modification of the local environment around the Zr absorption atom, which can be attributed to structural reordering or crystallization of the metallic glass after annealing. 30,44) The change of the free volume concentration was confirmed by dilatometric measurements conducted with a heating rate of 10 KÁmin À1 , as exemplified in Fig. 6.…”

“…29) HREM has also some drawbacks in terms of sample preparation and structural analysis for an entire specimen. 30) To circumvent or compensate these shortcomings, various analysis techniques have been introduced, such as positron annihilation spectroscopy, small-angle neutron scattering, high-energy x-ray diffraction, in-situ diffraction using synchrotron radiation, three-dimensional atom probe, nuclear magnetic resonance, and so on. [31][32][33][34][35][36][37] Furthermore, the EXAFS technique and dilatometer measurements are believed to be useful tools for examining the change of the atomistic-scale structure.…”

“…[31][32][33][34][35][36][37] Furthermore, the EXAFS technique and dilatometer measurements are believed to be useful tools for examining the change of the atomistic-scale structure. 30,[38][39][40][41] Even though the experimental information from the latter gives only the correlation between intrinsic materials properties and the atomistic-scale structural change, the former shows its ability to investigate a short-range order with a very small measurement range less than nm.…”

Amorphous-CuTa/amorphous-CoZrNb multilayers: Structure, mechanical properties and thermal stability

“…The spectra of the samples annealed at 300 and 450°C have a profile similar to that of the as-deposited sample, except that the nearest-neighbor peak shifts towards higher r value. Kim et al [31] and Wei et al [32] observed the similar phenomenon, which was related with the rearrangement of atoms. For getting structural parameters of nearest-neighbor shell of Co atoms, the high-frequency noise and the small residual background must be removed.…”

“…To fully understand the structural relaxation, local atomic structures were studied by EXAFS technique, which could tell the precise microstructure, such as the average bond distance [29,30]. The technique is widely used to study the effect of thermal annealing on the local atomic structure [29,31,32]. Through the Fourier transformation of the k 2 χ(k) into real space, the radial distribution function (RDF) of the local atomic environment of detected Co atom can be determined [30].…”