Grain Boundary Segregation of a Al-Zn-Mg Ternary Alloy.

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Abstract:

Auger electron spectroscopy AES has been used to measure the grain boundary concentration profiles of alloy additions in a A1-5.5 Zn-2.5 Mg ternary. The AES depth profiles show marked segregation of Mg and Zn to the grain boundary, in contrast to that reported previously on similar Al alloys. It is found that this apparent contradiction can be resolved by exploiting the plasmon-loss features of the AES spectra to help elucidate the grain boundary segregation. With the AESplasmon-loss measurements, one can determine not only the concentration of Mg and Zn at the grain boundary, but also the metallurgical environments surrounding the alloy additions. It is shown that, for over-aged specimens of the Al alloy, only a fraction of the total Mg at the grain boundary is incorporated in MgZn2 precipitates, the remainder being segregated to within a few atomic layers of the boundary. Author

Author(s):
Chen, J. M. ; Sun, T. S. ; Viswanadham, R. K. ; Green, J. A. S.
Author Organization(s):
MARTIN MARIETTA LABS BALTIMORE MD
Descriptive Note:
Interim technical rept.,
Pagination:
0030

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
MML-TR-77-29c
Contract/Grant Number(s):
N00014-74-C-0277
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_6_Net Centric; JCA_1.2.3_Educating; JCA_6.3_Net Management; JCA_4.6_Engineering; JCA_3.2_Engagement; JCA_3_Force Application; JCA_3.2.1_Kinetic Means
Modernization Areas:
Space
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*ALUMINUM ALLOYS, *TERNARY COMPOUNDS, *GRAIN BOUNDARIES, *MAGNESIUM ALLOYS, *ZINC ALLOYS, AGING(MATERIALS), GRAIN SIZE, QUENCHING, PROFILES, SEGREGATION(METALLURGY), CONCENTRATION(COMPOSITION), LOSSES, AUGER ELECTRON SPECTROSCOPY, PLASMONS, SPUTTERING, PRECIPITATES
Field(s)/Group(s):
Metallurgy and Metallography, Crystallography
Keyword(s):
WUNR031716
Report Date:
1977 Apr 01