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Crystallization Behavior and Microhardness Evolution in Al92−xNi8Lax Amorphous Alloys

Published online by Cambridge University Press:  03 March 2011

K.L. Sahoo ,
M. Wollgarten ,
K.B. Kim  and
J. Banhart
K.L. Sahoo
Affiliation:
National Metallurgical Laboratory, Jamshedpur 831007, India
M. Wollgarten
Affiliation:
Department of Materials, Hahn–Meitner-Institut Berlin, D-14109 Berlin, Germany
K.B. Kim
Affiliation:
Division of Physical Metallurgy, Darmstadt Technical University, D-64287 Darmstadt, Germany
J. Banhart
Affiliation:
Department of Materials, Hahn–Meitner-Institut Berlin, D-14109 Berlin, Germany
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Abstract

The crystallization behavior of melt-spun amorphous Al92−xNi8Lax (x = 4 to 6) alloys was investigated by means of differential scanning calorimetry, x-ray diffractometry, and transmission electron microscopy. Crystallization kinetics were analyzed by Kissinger and Johnson–Mehl–Avrami approaches. Microhardness of all the ribbons was examined at different temperatures and correlated with the corresponding structural evolution. The results show that the variation of La content from Al88Ni8La4 to Al86Ni8La6 has significant influence on the crystallization pathways from amorphous to stable crystalline phases and on the evolution of microhardness with temperature. The two stages of crystallization in Al88Ni8La4 and Al87Ni8La5 alloys correspond to formation of fcc-Al and Al11La3, Al3Ni, Al3La. In Al86Ni8La6, three stages of crystallization are observed which correspond to formation of a metastable phase, fcc-Al, Al11La3, Al3Ni, and Al11La3, Al3Ni, Al3La, and decomposition of a metastable phases to stable crystalline phases.

Keywords

Intermetallic alloysMetallic glass
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 11 , November 2005 , pp. 2927 - 2933
Copyright
Copyright © Materials Research Society 2005

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References

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