Journal
ULTRAMICROSCOPY
Volume 111, Issue 8, Pages 1370-1374Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2011.05.005
Keywords
Phase Separation; Metallic glass; Atom Probe Tomography (APT)
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Funding
- Deutsche Forschungsgemeinschaft DFG [Ma1531/10]
- Federal Ministry of Education and Research of the Federal Republic of Germany [13N9432]
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Microstructural characterization of Ni66Nb17Y17 as spun metallic glass ribbon was carried out using atom probe tomography. A comparison of different experimental conditions for pulsed laser and pulsed voltage field evaporation reveal that the laser pulsing can be optimized to avoid preferential evaporation of yttrium. Atom probe tomography measurements illustrate that the sample undergoes phase separation resulting in two interconnected phases during the process of vitrification. The yttrium-enriched phase was depleted in niobium and yttrium-depleted phase was enriched in niobium. Moreover, detailed analyses of the roller-contact and non-contact sides of the melt-spun ribbon show different wavelength of phase separated regions revealing that the degree of phase separation is directly associated with the cooling rate. (c) 2011 Elsevier B.V. All rights reserved.
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