Measurement of rheology of solidifying aluminum alloys using in situ neutron diffraction during casting
Stress build up in solidifying metallic alloys is of high importance as it impacts the integrity of the final casting through at least three aspects, associated distortions, formation of stress related defects such as solidification cracking and/or cold cracking and finally residual stresses that are detrimental for further material processing. The generation of stresses during casting is due to the conjunction of thermal gradients (usually high for productivity reasons and for obtaining fine grains) that impose thermally induced deformations on a material that has low yield strength close to its solidus temperature. In all castings, the alloy plastifies at high temperatures thus leading to the formation of more or less intense residual stresses. Macroscopic tensile strains and stresses are transmitted throughout the solid plus liquid mixture once grains or grain clusters have sufficiently coalesced. This transition called rigidity or mechanical coherency has been measured using in situ neutron diffraction casting. The goal of the present proposal is to determine the rheology of the as cast alloy using the same in situ casting experiments.
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DREZET Jean-Marie; CHOBAUT Nicolas and PIRLING Thilo. (2016). Measurement of rheology of solidifying aluminum alloys using in situ neutron diffraction during casting. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-01-149
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