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The Influence of Grain Boundary Precipitation on the Stress Corrosion Cracking of Al-Li and Al-Li-Cu Alloys

Published

Author(s)

Richard E. Ricker, A K. Vasudevan

Abstract

The stress corrosion cracking behavior of precipitation hardened alloys may depend on a large number of microstructural parameters that vary during fabrication and heat treatment such as grain size, grain boundary solute segregation, matrix, precipitate size, grain boundary precipitate size, precipitate free zone size, and matrix slip character. All of these factos vary simultaneously during normal heat treatments. As a result, it is difficult to assess independently the contribution of each microstructural factor to the SCC behavior of an alloy. To enable evaluation of the influence of grain boundary precipitate size distributon on the deformation, fracture, and stress corrosion cracking behavior of Al-Li and Al-Li-Cu alloys independent of these other factors, a series of experiments were designed where the matrix yield strength (and therefore, the matrix precipitate size distribution, etc.) was held constant while the grain boundary precipitate size was systematically varied. The relative SCC resistance of the heat treatment conditions was evaluated by conducting slow strian rate tests and the deformation and fracture behavior of these alloys was evaluated by scanning electron microscopy.
Proceedings Title
Hydrogen Effects in Metals/Corrosion Deformation Interactions, Proceedings of the International Conference | | | TMS
Conference Dates
September 22-26, 2002
Conference Title
Hydrogen Effects in Metals Corrosion Deformation Interactions Conference

Keywords

aluminum alloys, hydrogen embrittlement, stress corrosion cracking

Citation

Ricker, R. and Vasudevan, A. (2003), The Influence of Grain Boundary Precipitation on the Stress Corrosion Cracking of Al-Li and Al-Li-Cu Alloys, Hydrogen Effects in Metals/Corrosion Deformation Interactions, Proceedings of the International Conference | | | TMS, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=853205 (Accessed February 27, 2024)
Created December 1, 2003, Updated February 17, 2017