Hostname: page-component-7bb8b95d7b-dtkg6 Total loading time: 0 Render date: 2024-09-28T23:17:41.813Z Has data issue: false hasContentIssue false
  • English
  • Français

Mechanical Properties of High Strength Aluminum Alloys Formed by Pulsed Laser Deposition

Published online by Cambridge University Press:  15 February 2011

J. A. Knapp  and
D. M. Follstaedt
J. A. Knapp
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1056
D. M. Follstaedt
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1056
Get access

Abstract

Very high-strength alloys of Al(O) have been formed using a pulsed laser deposition (PLD) system to deposit from alternating targets of Al and Al2O3. Ion beam analysis and transmission electron microscopy show that the deposited material is uniform in composition with up to 33 at.% O and has a highly refined microstructure consisting of a fine, uniform dispersion of ∼1 nm diameter γ-Al2O3 precipitates. Ultra-low-load indentation testing combined with finite-element modeling is used to determine the mechanical properties of the layers. Yield stresses as high as 5.1 GPa have been measured in these materials, greatly exceeding the strengths of aerospace Al alloys (∼0.5 GPa) and even high strength steels. The key to the properties of these materials is the dispersion of small, hard precipitates spaced only a few Burgers vectors apart; dislocations are apparently unable to cut through and must bow around them.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 397: Symposium B – Advanced laser Processing of Materials-Fundamentals and Applications , 1995 , 387
Copyright
Copyright © Materials Research Society 1996

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

REFERENCE

1 Knapp, J.A., Follstaedt, D.M., and Myers, S.M., J. Appl. Phys., in press.Google Scholar
2 Follstaedt, D.M., Knapp, J.A., Barbour, J.C., Myers, S.M. and Dugger, M.T., Proc. of the Int. Conf. on Beam Processing of Advanced Materials, 10/30-11/2/95, in press.Google Scholar
3 Barbour, J.C., Follstaedt, D.M., and Myers, S.M., Nucl. Instr. & Meth. B, in press.Google Scholar
4 Bourcier, R.J., Myers, S.M. and Polonis, D.H., Nucl. Instr. & Meth. B44 (1990) 278.Google Scholar
5 Bourcier, R.J., Follstaedt, D.M., Dugger, M.T. and Myers, S.M., Nucl. Instr. & Meth. B59/60 (1991) 905.Google Scholar
6 Follstaedt, D.M., Myers, S.M. and Bourcier, R.J., Nucl. Instr. & Meth. B59/60 (1991) 909.Google Scholar
7 Follstaedt, D.M., Myers, S.M., Bourcier, R.J. and Dugger, M.T., Proc. of the Int. Conf. on Beam Processing of Advanced Materials, 11/2-5/92, (TMS, Warrendale, PA, 1993) 507.Google Scholar
8 Dugger, M.T., Bourcier, R.J., Follstaedt, D.M., and Myers, S.M., Tribology International, in press.Google Scholar
9 Knapp, J.A., Mat. Res. Soc. Symp. Proc. 236 (1992) 473.Google Scholar
10 Nanoindentation tests were performed at Nano Instruments, Inc., Knoxville, TN.Google Scholar
11 Oliver, W.C. and Pharr, G.M., J. Mater. Res. 7 (1992) 1564.Google Scholar
12 ABAQUS/Explicit version 5.4, Hibbitt, Karlsson & Sorensen, Inc., Pawtucket, RI.Google Scholar
12 Atlas of Stress-Strain Curves, Edited by Boyer, H.E. (ASM International, Metals Park, Ohio, 1987) 383.Google Scholar
13 Pharr, G.M., Tsui, T.Y., Bolshakov, A. and Oliver, W.C., Mat. Res. Soc. Symp. Proc. 338 (1994) 127.Google Scholar