期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 639, 期 -, 页码 465-469出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.03.179
关键词
Metallic glasses; Mechanical alloying; Free volume; Structural relaxation; X-ray diffraction
资金
- German Science Foundation [EC 111/26-1]
Structural relaxation in ball-milled Zr57.5Ti7.5Nb5Cu12.5Ni10Al7.5 glassy powders has been investigated by in-situ high-energy X-ray diffraction. The studies in reciprocal and real space reveal a contrasting behavior between medium- (MRO) and short-range order (SRO). The free volume is not uniformly distributed across the atoms: annihilation of free volume (i.e. shrinking) during heating is observed in the MRO, whereas an increase of free volume (i.e. expansion) occurs in the SRO, implying a denser SRO in the as-milled powder compared to the structurally relaxed material. This behavior is in agreement with the concepts of free volume and anti-free volume and can be attributed to the change of the coordination number in the first nearest-neighbor shell. Finally, the results demonstrate that the first diffuse diffraction maximum in reciprocal space is a reliable indicator to evaluate the structural changes occurring in the MRO. (C) 2015 Published by Elsevier B.V.
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