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01-06-2015 | Communication | Issue 6/2015

Metallurgical and Materials Transactions A 6/2015

Heterogeneous Nucleation of the T1 Phase on Dispersoids in Al-Cu-Li Alloys

Journal:
Metallurgical and Materials Transactions A > Issue 6/2015
Author:
Dimitrios Tsivoulas
Important notes
Manuscript submitted December 19, 2014.

Abstract

The major strengthening phase of modern Al-Cu-Li alloys, T1, is so far known to nucleate on a number of sites in the microstructure. However, its preferential nucleation on Al20Cu2Mn3 dispersoids has never been reported with strong evidence up to now. The present work suggests that such heterogeneous nucleation is possible and performs a comparison with the precipitates distributed homogeneously in the matrix. This phenomenon is shown to promote a particle decohesive fracture mode.

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