Precipitation kinetic of Al3(Sc,Zr) dispersoids in aluminium |
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| Authors: | W. Lefebvre F. Danoix H. Hallem B. Forbord A. Bostel K. Marthinsen |
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| Affiliation: | aGroupe de Physique des Matériaux, UMR 6634, Institut des Matériaux de Rouen, Université de Rouen, 76 801 Saint Etienne du Rouvray Cedex, France;bRaufoss Technological and Industrial Management, N-2831 Raufoss, Norway;cSINTEF Materials and Chemistry, N-7465 Trondheim, Norway;dNorwegian Institute of Science and Technology, N-7491 Trondheim, Norway |
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| Abstract: | The non-isothermal formation of Sc- and Zr-containing dispersoids in Al–Zr–Sc ternary alloys has been investigated by atom probe tomography (APT). In the early stages of precipitation, a high number density of Sc-rich clusters form. These clusters subsequently transform into Al3Sc particles with a L12 structure. When Zr diffusion becomes significant, Zr atoms are found to segregate to Al3Sc/α-Al matrix interfaces. Further annealing at 748 K gives rise to a duplex core/shell structure. |
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| Keywords: | Core– shell Dispersoids Al– Zr– Sc Diffusion Ramp Heating Dispersoid |
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