Hostname: page-component-848d4c4894-mwx4w Total loading time: 0 Render date: 2024-07-04T09:28:39.386Z Has data issue: false hasContentIssue false
  • English
  • Français

Tailoring of Mechanical Properties in Microlaminates

Published online by Cambridge University Press:  15 February 2011

M. Vill ,
D. P. Adams ,
S. M. Yalisove  and
J. C. Bilello
M. Vill
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
D. P. Adams
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
S. M. Yalisove
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
J. C. Bilello
Affiliation:
Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109
Get access

Abstract

A multiscalar approach is used to demonstrate the ability to control strength and toughness in microlaminates composed of molybdenum and tungsten. Here, two different thickness scales are utilized; an alternating stack of molybdenum and tungsten layers having thicknesses on the nanometer scale are combined with a layer of molybdenum having a thickness on the micron scale. The stack of thin layers acts as a strong phase and the thick layer acts as a tough phase. Multilayers of two configurations were fabricated which had total thicknesses of 31μm and 50μm. The tough phase thickness was 5μm for the 31μm multilayer and 1μm for the other. The strong phase contained a stack of 29 alternating 4nm thick layers of molybdenum and tungsten. Uniaxial tensile testing was performed using a standard Instron tensile testing machine, followed by optical analysis of specimen fracture surfaces. Fracture toughness ranged from 2.4 to 9.5MPa(m)1/2, and tensile strengths were observed from 126MPa to 883MPa. Control of mechanical properties was demonstrated by an increase in the upper bound fracture toughness from 2.7 to 9.5MPa(m)1/2 when the tough layer thickness was increased from 1μm to 5μm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 308: Symposium M1 – Thin Films: Stresses and Mechanical Properties IV , 1993 , 759
Copyright
Copyright © Materials Research Society 1993

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

1 Lehoczky, S. L., J. Appl. Phys., 94 (1978) 5479–85.Google Scholar
2 Hoffman, C. A. and Weeton, J. W., Met. Trans., 5 (1974) 309–12.CrossRefGoogle Scholar
3 Tao, J., Adams, D., Yalisove, S. M. and Bilello, J. C., Mat. Res. Soc. Symp. Proc., 239 (1992), 57–62.CrossRefGoogle Scholar
4 Koehler, J. W., Phys. Rev. B, 2 (1970) 547–51.Google Scholar
5 Head, A. K., Philos. Mag., 44 (1953) 92–4.CrossRefGoogle Scholar
6 Head, A. K., Proc. Phys. Soc. B, 66 (1953) 793–801.CrossRefGoogle Scholar
7 Cahn, J. W., Acta Metall., 11 (1963) 1274.Google Scholar
8 Adams, D. P., Vill, M., Tao, J., Yalisove, S. M. and Bilello, J. C., (to be published 1993).Google Scholar
9 Tao, J., Adams, D. P., Vill, M., Yalisove, S. M. and Bilello, J. C., (to be published 1993).Google Scholar
10 Courtney, T. H., Mechanical Behavior of Materials, (McGraw-Hill Book Company, New York, 1990) 448–9.Google Scholar
11 Bunshah, R. F., J. Vac. Sci. Technol., 11 (1974), 633–8).Google Scholar
12 Belomystev, Y. S., Yaroshevich, P. Y., Saratovskiy, L. M. and Pavlovich, T. M., Fiz. Metal. Metalloved., 27 (1969) 81–4.Google Scholar
13 Metals Handbook Desk Addition, (American Society for Metals, Metals Park, Ohio, 1985).Google Scholar
14 Masaki, T., J. Am. Ceram. Soc, 69 (1986) 638–40).Google Scholar