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The Effects of Precipitates and Mn-bearing Particles on the High Strain-Rate Compression of High Strength Aluminum

Published online by Cambridge University Press:  31 January 2011

Khalil Ibrahim Elkhodary ,
William Lee ,
Bryan Cheeseman ,
Lipeng Sun ,
Donald W Brenner  and
Mohammed Zikry
Khalil Ibrahim Elkhodary
Affiliation:
kielkhod@ncsu.edu, north carolina state university, mechanical and aerospace engineering, raleigh, North Carolina, United States
William Lee
Affiliation:
wmlee@ncsu.edu, north carolina state university, mechanical and aerospace engineering, raleigh, North Carolina, United States
Bryan Cheeseman
Affiliation:
bcheesem@arl.army.mil, Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, Maryland, United States
Lipeng Sun
Affiliation:
lpsun@ncsu.edu, North Carolina State University, Materials Science and Engineering, Raleigh, North Carolina, United States
Donald W Brenner
Affiliation:
brenner@ncsu.edu, North Carolina State University, Materials Science and Engineering, Raleigh, North Carolina, United States
Mohammed Zikry
Affiliation:
zikry@ncsu.edu, North Carolina State University, Mechanical and Aerospace Engineering, 2412 Broughton Hall, 2601 Stinson Drive - Campus Box 7910, Raleigh, North Carolina, 27695, United States, 919-515-5237, 919-515-7968
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Abstract

Transmission electron microscopy (TEM) and specialized dislocation-density based crystal-plasticity formulations and finite-element schemes were used to investigate the effects of nano-sized precipitates and micro-sized Mn-bearing particles on the behavior of Al-Cu-Mg-Ag alloys. By accurately representing crystallography and the morphology of the different precipitates, accurate predictions can be obtained that indicate that the nano-sized Ω and θ’ precipitates promote ductility and toughness by inhibiting shear-strain localization; whereas the micro-sized dispersed particles intensify localization. Collectively, the precipitates and dispersed particles, however, promote the strengthening of the alloy.

Keywords

crystallinenanoscaleAl
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1225: Symposium HH – Multiscale Polycrystal Mechanics of Complex Microstructures , 2009 , 1225-HH04-08
Copyright
Copyright © Materials Research Society 2010

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