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Influence of Ga Substitution on the Nature of Glasses in Zr69.5Al7.5-xGaxCu12Ni11 and Ce75Al25-xGax Metallic Glass Compositions

Published online by Cambridge University Press:  09 February 2015

R.K. Mandal ,
R.S. Tiwari ,
Devinder Singh  and
Dharmendra Singh
R.K. Mandal
Affiliation:
Metallurgical Engineering, IIT (BHU), Varanasi 221005, UP INDIA
R.S. Tiwari
Affiliation:
Department of Physics, BHU, Varanasi 221005, UP INDIA
Devinder Singh
Affiliation:
Department of Physics, Panjab University, Chandigarh 160014, Punjab INDIA
Dharmendra Singh
Affiliation:
Department of Physics, BHU, Varanasi 221005, UP INDIA
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Abstract

In this presentation, results of our recent investigations on the role of Ga on Al site in Zr69.5Al7.5-xGaxCu12Ni11 and Ce75Al25-xGax metallic glass compositions will be discussed. Ga like Al is normally expected to be in trivalent state. However, it may go in monovalent state depending on other alloying elements. The rapidly solidified melt spun ribbons of above two alloys gave rise to two important conclusions. The Zr69.5Al7.5-xGaxCu12Ni11 system displayed metallic glass formation in the range of x=0 to 7.5. In this process, we have come out with a new composition of glass without Al corresponding to x=7.5. In contrast to the above, for Ce-Al(Ga) system, we have observed phase separation in glass after dilute substitution of Ga. It seems that such a phase separation in this system cannot be understood in terms of summation of enthalpy of mixing of the various possible binaries in this system. The substitution of Ga in different valence states might have created chemical pressure leading to creation of two types of distinct major clusters. The phase separation may be due to this. This has also given rise to excursion of Ce 4f-states of the alloy. This and aforesaid ‘chemical pressure’ will be corroborated based on results of binary Ce-Al system under pressure by other investigators.

Keywords

amorphousquasicrystalnano-indentation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1757: Symposium UU – Structure-Property Relations in Amorphous Solids , 2015 , mrsf14-1757-uu03-06
Copyright
Copyright © Materials Research Society 2015 

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