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Phase stability and consolidation of glassy/nanostructured Al85Ni9Nd4Co2 alloys

Published online by Cambridge University Press:  03 March 2011

L.C. Zhang ,
M. Calin ,
M. Branzei ,
L. Schultz  and
J. Eckert
L.C. Zhang*
Affiliation:
Fachgebiet Physikalische Metallkunde, Fachbereich 11-Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt, Germany; and Institut für Komplexe Materialien, IFW Dresden, D-01171 Dresden, Germany
M. Calin
Affiliation:
Fachgebiet Physikalische Metallkunde, Fachbereich 11-Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt, Germany; and Materials Science and Engineering Faculty, University “Politehnica” of Bucharest, R-060032 Bucharest, Romania
M. Branzei
Affiliation:
Materials Science and Engineering Faculty, University “Politehnica” of Bucharest, R-060032 Bucharest, Romania
L. Schultz
Affiliation:
Institut für Metallische Werkstoffe, IFW Dresden, D-01171 Dresden, Germany
J. Eckert
Affiliation:
Fachgebiet Physikalische Metallkunde, Fachbereich 11-Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt, Germany; and Institut für Komplexe Materialien, IFW Dresden, D-01171 Dresden, Germany
*
a) Address all correspondence to this author.e-mail address: [email protected] and [email protected]
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Abstract

Al85Ni9Nd4Co2 metallic glass/nanostructured ribbons and powders were used as starting materials for producing bulk amorphous/nanostructured Al-based alloys. Glassy ribbons were obtained by melt spinning at wheel surface velocities ranging from 5 to 37 m/s. The amorphous ribbons exhibited a supercooled liquid region of ∼20 K, a reduced glass transition temperature of ∼0.47 and γ ∼ 0.328. Mechanical alloying of the elemental powder mixture did not lead to amorphization. However, amorphous powders obtained by milling the glassy ribbons for 9 h exhibited a thermal stability similar to the initial ribbons. Isothermal differential scanning calorimetry measurements were used to determine the consolidation parameters of the glassy powders. Consolidation at 513 K by uniaxial hot pressing and hot extrusion indicated that the former method leads to bulk glassy samples, whereas the latter one yields nanostructured α-Al/glassy matrix composites.

Keywords

AlAmorphousRapid solidification
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1145 - 1155
Copyright
Copyright © Materials Research Society 2007

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