Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 45A, Issue 3, Pages 1338-1351Publisher
SPRINGER
DOI: 10.1007/s11661-013-2103-2
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Funding
- EPSRC [EP/G022402/1]
- Constellium, Centre de Recherches de Voreppe, France
- Engineering and Physical Sciences Research Council [EP/G022402/1, EP/H020047/1] Funding Source: researchfish
- EPSRC [EP/H020047/1, EP/G022402/1] Funding Source: UKRI
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The effect of individual and combined addition of dispersoid-forming alloying elements Zr and Mn on the fracture behavior of the Al-Cu-Li alloy 2198 has been investigated by the Kahn tear test. Overall, the standard baseline 2198 alloy containing only Zr exhibited the best performance, while the alloy with the combined presence of Zr and Mn was slightly inferior. The lowest properties were seen for a Zr-free 2198-0.4Mn alloy variant. In the T351 temper fracture initiated at coarse constituent particles that formed large cavities and microvoid sheets linked the initial sites of void growth. In the Mn-containing alloys microvoids clearly nucleated at the coarser Al20Cu2Mn3 dispersoids within the microstructure, while this was not identifiable for the finer coherent Al3Zr dispersoids. However, this difference in the mechanism of cavity linkage had little effect on the overall toughness of the materials, which was more closely related to the effect of Mn and Zr on the level of recrystallization. Extended artificial aging promoted grain boundary decohesion due to the precipitation of high densities of T-1 particles on GBs and favored a cleavage fracture mode. Particle decohesive fracture was also promoted by T-1 precipitation on the Mn dispersoids. (C) The Minerals, Metals & Materials Society and ASM International 2013
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