Abstract
The influence of melt temperature on the glass formation, physical properties and local structure of (Fe71.2B24Y4.8)96Nb4 bulk metallic glass (BMG) was investigated through X-ray diffractometry, differential scanning calorimetry, thermal dilatation, and Mössbauer spectra tests. Amorphous alloys were formed by fast cooling of the melt from the temperature range of 1573–1773 K. BMG cast from 1623 K has lower Curie temperature and larger spontaneous volume magnetostriction, i.e., stronger Invar effect. The abnormality, which can not be eliminated by annealing, is attributed to the higher amount of Fe–Fe pairs indicated by the hyperfine field distribution. This special local structure is inherited from the melt, which has a liquid–liquid change manifested by an exothermic step region at the temperature range of 1615–1650 K. Through a slow-cooling process, the melt in the liquid–liquid change is frozen to a crystalline structure contained Y2Fe17 phase with a high intensity signal. These findings help explain the correlation between the liquid–liquid change and the structure of cooling products.
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Acknowledgements
The authors are grateful for the funding support from the Innovation and Technology Commission of Hong Kong Government under the project of ITS/228/11 and the National Natural Science Foundation of China for the Grant of No. 51201109.
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Hu, Q., Sheng, H.C., Fu, M.W. et al. Influence of melt temperature on the Invar effect in (Fe71.2B24Y4.8)96Nb4 bulk metallic glass. J Mater Sci 49, 6900–6906 (2014). https://doi.org/10.1007/s10853-014-8392-z
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DOI: https://doi.org/10.1007/s10853-014-8392-z