Abstract
The ductile to brittle transition that occurs in amorphous Fe78Si9B13 (METGLAS-2605S2) has been investigated using mechanical measurements over the temperature range 250–370 °C. The fracture toughness values, K Ic , have been determined for a range of annealing times (5–30 min) and cooling rates of 15–45 °C/min. A pronounced ductile to brittle transition is observed around 310(10) °C although no obvious structural changes are evident as indicated by x-ray diffraction. Comparison of transmission and back-scattered conversion electron 57Fe Mössbauer spectra for the bulk as-received ribbon in the ductile state (\(K_{Ic}=52~{\rm MPa} \cdot \sqrt{m}\)) and the ribbon annealed to the brittle state (\(K_{Ic}\sim10~{\rm MPa} \cdot \sqrt{m}\)) indicates magnetic texture effects in both the bulk and on the surface of these amorphous ribbons, related to the magnetostriction resulting from the quenched-in stress during the ribbon production process, and the ensuing stress-relief upon annealing.
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Proceedings of the 32nd International Conference on the Applications of the Mössbauer Effect (ICAME 2013) held in Opatija, Croatia, 1–6 September 2013.
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Cadogan, J.M., Campbell, S.J., Jing, J. et al. Annealing embrittlement of Fe78Si9B13 (METGLAS-2605S2). Hyperfine Interact 226, 7–14 (2014). https://doi.org/10.1007/s10751-013-0912-8
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DOI: https://doi.org/10.1007/s10751-013-0912-8