An anomalous enhancement of hardness has been found in the V/Ti nanostructured multilayer films, in which the constituent materials have the same elastic modulus. The high-resolution transmission electron microscopy results showed that the V layers take bcc structure at all modulation periods from 2.8 to 150.0 nm. The Ti layers are bcc structured at modulation periods less than 3.0 nm. The Ti layers are hcp structured at modulation periods of more than 5.9 nm. There is a Burgers orientation relation between the bcc V and the hcp Ti. Coherent stress hardening between the interfaces of bcc V and hcp Ti layers and the different crystal structures appear to be one likely reason for the hardness enhancement in V/Ti nanostructured multilayers.
REFERENCES
1.
U.
Helmersson
, S.
Todorova
, S. A.
Barnett
, J.-E.
Sundgren
, L. C.
Markert
, and J. E.
Greene
, J. Appl. Phys.
62
, 481
(1987
).2.
3.
4.
5.
J.
Xu
, M.
Kamiko
, Y.
Zhou
, R.
Yamamoto
, G.
Li
, and M.
Gu
, J. Appl. Phys.
89
, 3674
(2001
).6.
7.
R. C.
Cammarata
, T. E.
Schlesinger
, C.
Kim
, S. B.
Qadri
, and A. S.
Edelstein
, Appl. Phys. Lett.
56
, 1862
(1990
).8.
B. J.
Daniels
, W. D.
Nix
, and B. M.
Clemens
, Mater. Res. Soc. Symp. Proc.
343
, 549
(1994
).9.
C.
Kim
, S. B.
Qadri
, M. R.
Scanlon
, and R. C.
Cammarata
, Thin Solid Films
240
, 52
(1994
).10.
11.
12.
13.
This content is only available via PDF.
© 2002 American Institute of Physics.
2002
American Institute of Physics
You do not currently have access to this content.
