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Synthesis and mechanical characterisation of Fe-based bulk metallic glasses and mixed amorphous/crystalline phases

Published online by Cambridge University Press:  01 February 2011

Alberto Castellero ,
A. Lindsay Greer ,
A. Reza Yavari  and
Akihisa Inoue
Alberto Castellero
Affiliation:
Institute for Materials Research, Tohoku University, 2–1–1 Katahira, Aoba-Ku Sendai, Miyagi 980–8577, Japan
A. Lindsay Greer
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom
A. Reza Yavari
Affiliation:
LTPCM-CNRS, Institut National Polytechnique de Grenoble B.P. 75, 38402, St Martin d'Hères, France
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, 2–1–1 Katahira, Aoba-Ku Sendai, Miyagi 980–8577, Japan
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Abstract

Fully amorphous and mixed amorphous/crystalline bulky (Fe77+yGa3P9.5-yC4.5B3.5Si2.5)(100-x)/100Fex alloys were prepared varying Fe and Fe-P contents. The effect of the compositional changes on glass forming ability (GFA), stability of the amorphous phase and mechanical properties was studied. When y = 0 and x is enhanced from 0 to 2, the stability of the supercooled liquid region decreases of 10 K. For x = 0 and y = 3.5 the glass forming ability is drastically reduced leading to a mixed structure consisting of bcc-Fe, Fe3(P,C,B) and a small fraction of amorphous phase.

During compression test at room temperature the deformation of fully amorphous samples (y = 0) is dominated by the initiation and propagation of shear bands with consequent nil or small plastic deformation (0.2 % at 3000 MPa) for the alloys with x = 2 and x = 0 respectively. Embrittlement of (Fe77Ga3P9.5C4.5B3.5Si2.5)0.98Fe2 was observed after partial and full devitrification.

A higher Young modulus and a maximum strength of 3300 MPa were shown by the as cast partially crystalline Fe80.5Ga3P6C4.5B3.5Si2.5 alloy; also in this case, no yielding was detected.

Finally, compression tests at high temperature for fully amorphous Fe77Ga3P9.5C4.5B3.5Si2.5 showed inhomogeneous deformation up to 402°C. Homogeneous non-Newtonian plastic deformation was detected at 427°C. Newtonian homogeneous flow at 452°C is limited by the crystallisation of the superliquid and consequent final failure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 791: Symposium Q – Mechanical Properties of Nanostructured Materials and Nanocomposites , 2003 , Q11.4
Copyright
Copyright © Materials Research Society 2004

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References

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