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Structure, Annealing Characteristics and Mechanical Properties of Mg60Cu30-yY10Siy Bulk Amorphous Alloys

Published online by Cambridge University Press:  11 February 2011

U. Wolff ,
B. Yang ,
N. Pryds  and
J.A. Wert
U. Wolff
Affiliation:
Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
B. Yang
Affiliation:
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
N. Pryds
Affiliation:
Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
J.A. Wert
Affiliation:
Materials Research Department, Risø National Laboratory, DK-4000 Roskilde, Denmark
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Abstract

The effect of different Si contents on the glass forming ability (GFA) and the amorphous-to-crystalline transformation has been investigated for the Mg-Cu-Y-Si system. Four Mg60Cu30-yY10Siy (y = 1–5 at.%) alloys were prepared using a relatively simple technique of rapid cooling of the melt in a copper mould. Crystallization was induced by heat treatment of the alloys and the samples were then characterized concerning their microstructure and thermal stability by X-ray diffraction (XRD), optical (OM) and scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) at a constant heating rate. Partial substitution of Cu by Si leads to a transition of the as-cast structure at a constant cooling rate from amorphous to crystalline with increasing Si content. Furthermore, the glass transition temperature (Tg) of the Mg-Cu-Y-Si alloy is lower compared to the Mg-Cu-Y system. The mechanical properties of the bulk Mg-Cu-Y-Si alloys have been investigated and found to vary with the Si content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC11.14
Copyright
Copyright © Materials Research Society 2003

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References

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