Hostname: page-component-7c8c6479df-ws8qp Total loading time: 0 Render date: 2024-03-28T00:14:41.862Z Has data issue: false hasContentIssue false

Evolution of metastable phases during crystallization of pulsed laser deposited amorphous Al–Fe films

Published online by Cambridge University Press:  31 January 2011

Sandip Bysakh
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore 560012, India
Puspendu Kumar Das
Affiliation:
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
Kamanio Chattopadhyay
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore 560012, India
Get access

Abstract

Amorphous thin films of different Al–Fe compositions were produced by plasma/vapor quenching during pulsed laser deposition. The chosen compositions Al72Fe28, Al40Fe60, and Al18Fe82 correspond to Al5Fe2 and B2-ordered AlFe intermetallic compounds and α–Fe solid solution, respectively. The films contained fine clusters that increased with iron content. The sequences of phase evolution observed in the heating stage transmission electron microscopy studies of the pulsed laser ablation deposited films of Al72Fe28, Al40Fe60, and Al18Fe82 compositions showed evidence of composition partitioning during crystallization for films of all three compositions. This composition partitioning, in turn, resulted in the evolution of phases of compositions richer in Fe, as well as richer in Al, compared to the overall film composition in each case. The evidence of Fe-rich phases was the B2 phase in Al72Fe28 film, the L12- and DO3-ordered phases in Al40Fe60 film, and the hexagonal ε–Fe in the case of the Al18Fe82 film. On the other hand, the Al-rich phases were Al13Fe4 for both Al72Fe28 and Al40Fe60 films and DO3 and Al5Fe2 phases in the case of Al18Fe82 film. We believe that this tendency of composition partitioning during crystallization from amorphous phase is a consequence of the tendency of clustering of the Fe atoms in the amorphous phase during nucleation. The body-centered cubic phase has a nucleation advantage over other metastable phases for all three compositions. The amorphization of Al18Fe82 composition and the evolution of L12 and ε–Fe phases in the Al–Fe system were new observations of this work.

Type
Articles
Copyright
Copyright © Materials Research Society 2003

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Saenger, K.L., Process. Adv. Mater. 2, 1 (1993).Google Scholar
Bysakh, S., Das, P.K., and Chattopadhyay, K., Philos. Mag. A 81, 2689 (2001).CrossRefGoogle Scholar
Bysakh, S., Das, P.K., and Chattopadhyay, K., Scr. Mater. 44, 1847 (2001).CrossRefGoogle Scholar
Bysakh, S., Das, P.K., and Chattopadhyay, K., Mater. Sci. Eng. A 44, 1831 (2001).Google Scholar
Bysakh, S., Das, P.K., and Chattopadhyay, K., Philos. Mag. A 82, 1235 (2002).Google Scholar
Davies, H.A., in Metallic Glass Formation, Amorphous Metallic Alloys, edited by Luborsky, F.E. (Butterworths Monographs in Materials, London, U.K., 1983), p. 8.CrossRefGoogle Scholar
Lennard-Jones, J.E., Proc. of R. Soc. A 163, 127 (1937).Google Scholar
Bysakh, S., M.Sc. (Eng.) Thesis, Indian Institute of Science, Bangalore, India (1995).Google Scholar
Saenger, K.L., Process. Adv. Mater. 3, 63 (1993).Google Scholar
Jackson, T.J. and Palmer, S.B., J. Phys. D: Appl. Phys. 27, 1581 (1994).CrossRefGoogle Scholar
Chrisey, D.B. and Hubler, G.K., Pulsed Laser Deposition of Thin Films (John Wiley, New York, 1994).Google Scholar
Dupendant, H., Gavigan, J.P., Givord, D., Lienard, A., Rebouillat, J.P., and Souche, Y., Appl. Surf. Sci. 43, 369 (1989).CrossRefGoogle Scholar
Misra, D.S. and Palmer, S.B., Physica C 176, 43 (1991).CrossRefGoogle Scholar
Krebs, H.U. and Bremert, O., Appl. Phys. Lett. 62, 2341 (1993).CrossRefGoogle Scholar
Kim, D.H. and Cantor, B., J. Mater. Sci. 29, 2884 (1994).CrossRefGoogle Scholar
Sumiyama, K., Hirose, Y., and Nakamura, Y., J. Phys. Soc. Jpn. 59, 2963 (1990).CrossRefGoogle Scholar
Reddy, B.V., Khanna, S.N., and Deevi, S.C., Chem. Phys. Lett. 333, 465 (2001).CrossRefGoogle Scholar
Sato, H. and Arrott, A., Phys. Rev. 114, 1427 (1959).CrossRefGoogle Scholar