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Title: Mechanical properties of high strength aluminum alloys formed by pulsed laser deposition

Abstract

Very high-strength alloys of A1(O) have been formed using a pulsed laser deposition (PLD) system to deposit from alternating targets of A1 and A1{sub 2}O{sub 3}. 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 {approximately}1 nm diameter {gamma}-A1{sub 2}O{sub 3} 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.

Authors:
;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
164916
Report Number(s):
SAND-95-1406C; CONF-951153-17
ON: DE96003646
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 9. international forum on electrolysis in the chemical industry: applied electrochemical technologies, Clearwater Beach, FL (United States), 5-9 Nov 1995; Other Information: PBD: [1995]
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; MECHANICAL PROPERTIES; ALUMINIUM; ALUMINIUM OXIDES; OXYGEN; ENERGY BEAM DEPOSITION; TRANSMISSION ELECTRON MICROSCOPY; FINITE ELEMENT METHOD; TESTING; TRIBOLOGY

Citation Formats

Knapp, J A, and Follstaedt, D M. Mechanical properties of high strength aluminum alloys formed by pulsed laser deposition. United States: N. p., 1995. Web.
Knapp, J A, & Follstaedt, D M. Mechanical properties of high strength aluminum alloys formed by pulsed laser deposition. United States.
Knapp, J A, and Follstaedt, D M. 1995. "Mechanical properties of high strength aluminum alloys formed by pulsed laser deposition". United States. https://www.osti.gov/servlets/purl/164916.
@article{osti_164916,
title = {Mechanical properties of high strength aluminum alloys formed by pulsed laser deposition},
author = {Knapp, J A and Follstaedt, D M},
abstractNote = {Very high-strength alloys of A1(O) have been formed using a pulsed laser deposition (PLD) system to deposit from alternating targets of A1 and A1{sub 2}O{sub 3}. 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 {approximately}1 nm diameter {gamma}-A1{sub 2}O{sub 3} 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.},
doi = {},
url = {https://www.osti.gov/biblio/164916}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 31 00:00:00 EST 1995},
month = {Sun Dec 31 00:00:00 EST 1995}
}

Conference:
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