1. Comportamento Mecânico da Liga de Alumínio 2024 Submetida a Diferentes Tempos de Envelhecimento.
- Author
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CAVALCANTE, F. F. and da SILVA, W. S.
- Abstract
Heat treatable aluminum alloys may experience significant changes in mechanical properties depending on heat treatment developed. Recently, some researches showed that some aluminum alloys in underaged conditions may indicate the self-healing phenomenon, in other words, when stretched mechanically, the material could present a closure, or a reduction in crack growth rate due local compressive stress associated to dynamic precipitation. In this context, its valued the relationship between mechanical properties and heat treatment in 2024 aluminum alloy when submitted to solubilization (480° C for 2,5h) and artificial aging (190° C for 1h, 3h, 5h, 8h and 12h), obtaining underaged, peak hardness and overaged conditions. The samples were mechanically featured using a tensile test (ASTM E8/E8M); in structural aspects, using optical microscopy, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). In underaged 2024 aluminum alloy, the phenomenon of self-healing has become tangible, because occurred dynamic precipitation on samples as received and underaged conditions, associated with small peaks in stress vs strain curves. This opens a great perspective for this investigation of self-healing in underaged conditions, providing new mechanical designs for this type of phenomenon. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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