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Thin Solid Films 424 (2003) 9398 0040-6090/03/$ -see front matter 2002 Elsevier Science B.V. All rights reserved.
 

Summary: Thin Solid Films 424 (2003) 9398
0040-6090/03/$ - see front matter 2002 Elsevier Science B.V. All rights reserved.
PII: S0040-6090Z02.00924-0
Sputter deposited nanocrystalline Ni-25Al alloy thin films and NiyNi Al3
multilayers
R. Banerjee*, G.B. Thompson, P.M. Anderson, H.L. Fraser
Department of Materials Science and Engineering, The Ohio State University, 177 Watts Hall 2041 College Road, Columbus OH, USA
Abstract
Thin films of nominal composition Ni-25at%Al have been sputter deposited from a target of the intermetallic compound Ni Al3
at different substrate deposition temperatures. The film deposited on an unheated substrate exhibited a strongly textured columnar
growth morphology and consisted of a mixture of metastable phases. Nanoindentation studies carried out on this film exhibited a
strong strain hardening tendency. In contrast, the film deposited at 200 8C exhibited a recrystallized non-textured microstructure
consisting of grains of a partially ordered Ni Al phase. At higher deposition temperatures (;400 8C), larger grains of the bulk3
equilibrium, long-range ordered, Ll Ni Al phase were observed in the film. Unlike the film deposited on an unheated substrate,2 3
the films deposited at elevated temperatures did not exhibit any dependence of the hardness on the indentation depth and,
consequently no strain hardening. The average hardness of the film deposited at 200 8C was higher than the one deposited at 400
8C. In addition to monolithic Ni-25Al thin films, multilayered NiyNi3Al thin films were also deposited. Multilayers deposited
non-epitaxially on unheated substrates exhibited a strong {111} fiber texture while those deposited epitaxially on (001) NaCl
exhibited a {001} texture. Free-standing multilayers of both types of preferred orientations as well as of different layer thicknesses
were deformed in tension untill fracture. Interestingly, the {111} oriented multilayers failed primarily by a brittle fracture while

  

Source: Anderson, Peter M. - Department of Materials Science and Engineering, Ohio State University

 

Collections: Materials Science