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An Examination of the Composition and Microstructure of Coarse Intermetallic Particles in AA2099-T8, Including Li Detection

Published online by Cambridge University Press:  18 June 2018

Colin M. MacRae ,
Anthony E. Hughes ,
James S. Laird ,
A. M. Glenn ,
Nicholas C. Wilson ,
Aaron Torpy ,
Mark A. Gibson ,
Xiaorong Zhou ,
Nick Birbilis  and
George E. Thompson
Colin M. MacRae*
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169, Victoria, Australia
Anthony E. Hughes
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169, Victoria, Australia Institute of Frontier Materials, Deakin University, 221 Burwood Highway, Burwood, VIC 3125, Australia Department of Materials Science and Engineering, Monash University, Clayton, VIC3800, Australia
James S. Laird
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169, Victoria, Australia
A. M. Glenn
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169, Victoria, Australia
Nicholas C. Wilson
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169, Victoria, Australia
Aaron Torpy
Affiliation:
CSIRO, Mineral Resources, Bayview Ave, Clayton, 3169, Victoria, Australia
Mark A. Gibson
Affiliation:
Department of Materials Science and Engineering, Monash University, Clayton, VIC3800, Australia CSIRO, Manufacturing, Bayview Ave, Clayton, VIC3169, Australia
Xiaorong Zhou
Affiliation:
Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M13 9PL, England, UK
Nick Birbilis
Affiliation:
Department of Materials Science and Engineering, Monash University, Clayton, VIC3800, Australia
George E. Thompson
Affiliation:
Corrosion and Protection Centre, School of Materials, The University of Manchester, Manchester M13 9PL, England, UK
*
Author for correspondence: Colin M. MacRae, E-mail: colin.macrae@csiro.au
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Abstract

Electron and proton microprobes, along with electron backscatter diffraction (EBSD) analysis were used to study the microstructure of the contemporary Al–Cu–Li alloy AA2099-T8. In electron probe microanalysis, wavelength and energy dispersive X-ray spectrometry were used in parallel with soft X-ray emission spectroscopy (SXES) to characterize the microstructure of AA2099-T8. The electron microprobe was able to identify five unique compositions for constituent intermetallic (IM) particles containing combinations of Al, Cu, Fe, Mn, and Zn. A sixth IM type was found to be rich in Ti and B (suggesting TiB2), and a seventh IM type contained Si. EBSD patterns for the five constituent IM particles containing Al, Cu, Fe, Mn, and Zn indicated that they were isomorphous with four phases in the 2xxx series aluminium alloys including Al6(Fe, Mn), Al13(Fe, Mn)4 (two slightly different compositions), Al37Cu2Fe12 and Al7Cu2Fe. SXES revealed that Li was present in some constituent IM particles. Al SXES mapping revealed an Al-enriched (i.e., Cu, Li-depleted) zone in the grain boundary network. From the EBSD analysis, the kernel average misorientation map showed higher levels of localized misorientation in this region, suggesting greater deformation or stored energy. Proton-induced X-ray emission revealed banding of the TiB2 IM particles and Cu inter-band enrichment.

Keywords

AA2099 aluminium alloyselectron microprobesoft X-ray emission spectroscopyLi detectionelectron backscatter diffraction
Type
Materials Science Applications
Information
Microscopy and Microanalysis , Volume 24 , Issue 4 , August 2018 , pp. 325 - 341
Copyright
© Microscopy Society of America 2018 

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