Annealing embrittlement of Fe78Si9B13 (METGLAS-2605S2) |
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Authors: | J M Cadogan S J Campbell J Jing C P Foley P Kater Y W Mai |
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Institution: | 1. School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, Canberra, BC, 2610, Australia 2. CSIRO Division of Materials Science and Engineering, Bradfield Road, West Lindfield, NSW, 2070, Australia 3. Centre for Advanced Materials Technology, School of Aerospace, Mechanical and Mechatronic Engineering J07, The University of Sydney, Sydney, NSW, 2006, Australia
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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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