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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
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.

Type
Articles
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

1Kim, Y., Hiraga, K., Inoue, A., Masumoto, T. and Jo, H.: Crystallization and high mechanical strength of Al-based amorphous alloys. Mater. Trans., JIM 35, 293 (1994).CrossRefGoogle Scholar
2He, Y., Poon, S.J. and Shiflet, G.: Synthesis and properties of metallic glasses that contain aluminum. Science 241, 1640 (1988).CrossRefGoogle ScholarPubMed
3Inoue, A.: Amorphous, nanoquasicrystalline and nanocrystalline alloys in Al-based systems. Prog. Mater. Sci. 43, 365 (1998).CrossRefGoogle Scholar
4Ye, F. and Lu, K.: Pressure effect on crystallization kinetics of an Al-La-Ni amorphous alloy. Acta Mater. 47, 2449 (1999).CrossRefGoogle Scholar
5Sahoo, K.L., Wollgarten, M., Haug, J. and Banhart, J.: Effect of La on the crystallization behaviour of amorphous Al94−xNi6Lax (x = 4 to 7) alloys. Acta Mater. 53(14), 3861 (2005).CrossRefGoogle Scholar
6Zhuang, Y., Jiang, J., Lin, Z., Mezouar, M., Crichton, W. and Inoue, A.: Evidence of eutectic crystallization and transient nucleation in Al89La6Ni5 amorphous alloy. Appl. Phys. Lett. 79, 743 (2001).CrossRefGoogle Scholar
7Gangopadhyay, A. and Kelton, K.: Effect of rare-earth atomic radius on the devitrification of Al88RE8Ni4 amorphous alloys. Philos. Mag. A 80, 1193 (2000).CrossRefGoogle Scholar
8Gogebakan, M., Warren, P. and Cantor, B.: Crystallization behaviour of amorphous Al85Y11Ni4 alloy. Mater. Sci. Eng. A226–228, 168 (1997).CrossRefGoogle Scholar
9Cullity, B.D.: Elements of X-Ray Diffraction; No. 284 (Addison Wesley, London, U.K., 1978).Google Scholar
10Kissinger, H.E.: Reaction kinetics in differential thermal analysis. Anal. Chem. 29, 1702 (1957).CrossRefGoogle Scholar
11Johnson, W. and Mehl, R.: Reaction kinetics in process of nucleation and growth. Trans. Am. Inst. Min. Metall. Eng. 135, 416 (1939).Google Scholar
12Avrami, M.: Granulation, phase change, and microstructure kinetics of phase change. III. J. Chem. Phys. 9, 177 (1941).CrossRefGoogle Scholar
13Li, J., Zhou, X. and Jiang, Q.: Crystallization kinetics of Al82La9Ni9 amorphous alloy. J. Mater. Sci. Lett. 20, 1679 (2001).CrossRefGoogle Scholar
14Tokar, A. and Levin, L.: The amorphous metallic Al91la5Ni4 alloy: Kinetics of crystallization. Z. Metallkd. 89, 16 (1998).Google Scholar
15Christian, J.: The Theory of Transformation in Metals and Alloys, Part 1, Equilibrium and General Kinetic Theory; No. 542 (Pergamon Press, Oxford, U.K., 1975).Google Scholar
16Hono, K., Zhang, Y., Inoue, A. and Sakurai, T.: Atom probe studies of nanocrystalline microstructural evolution in some amorphous alloys. Mater. Trans., JIM 36, 909 (1995).CrossRefGoogle Scholar
17Wang, Y., Shek, C., Qiang, J., Wong, C., Chen, W. and Dong, C.: The e/a factor governing the formation and stability of (Zr76Ni24)1−xAlx bulk metallic glasses. Scripta Mater. 48, 1529 (2003).CrossRefGoogle Scholar