Precipitation kinetic of Al₃(Sc,Zr) dispersoids in aluminium

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• 作者：W. Lefebvre ; F. Danoix ; H. Hallem ; B. Forbord ; A. Bostel ; K. Marthinsen
• 关键词：Core– ; shell ; Dispersoids ; Al– ; Zr– ; Sc ; Diffusion ; R Heating ; Dispersoid
• 刊名：Journal of Alloys and Compounds
• 出版年：2009
• 出版时间：20 February 2009
• 年：2009
• 卷：470
• 期：1-2
• 页码：107-110
• 全文大小：755 K

文摘

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.