Speaker
Description
The use of advanced aluminum alloys in the aerospace industry provides high fracture toughness, high fatigue resistance, and corrosion resistance while satisfying the need for lower structural weight [1]. Nevertheless, defects such as porosity may cause a degradation of the mechanical properties in alloys such as Al-2050. Many efforts have been made to reduce the porosity formed during casting and to close them during the forming process of thick aluminium plates [2,3]. However, some porosities might still appear during the forming process in a tensile state and up to now, there is a lack of understanding of this phenomenon.
In this work, we present a dynamic multiscale X-ray 3D imaging that has been developed to better understand the relationship between pore nucleation and growth and the environment during the forming process. The experimental setup used at ID16B beamline at the ESRF to perform in situ nano-imaging during high-temperature tensile tests is presented. This experimental array for in situ X-Ray nano-tomography allows the acquisition of in situ-high temperature (400-500°C) tensile tests. With a pixel size of 100 nm with an energy of 29.2 keV.
3D volumes are used to characterize the morphology of the pores. The pores are classified according to their shape and size [3]. The results that relate the pore evolution with the tensile field and their surroundings are presented as well as the influence of the temperature on the pore growth. Finally, as a perspective, the link between the results and the industrial process will be discussed.
[1] M. Nakai, T. Eto, Mater. Sci. Eng. A 285 (2000) 62
[2] M. Saby et al., J. Manuf. Process. vol. 19 (2015)
[3] E. Plancher, P. Gravier, E. Chauvet, J.-J. Blandin, E. Boller, G. Martin, L. Salvo, P. Lhuissier, Acta Materialia 2019, 181,1.
| Speaker Country | Mexico |
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