Atom probe study of phase transformations in a Ti–48 at.%Al alloy

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• 作者：Lefebvre ; W. ; Menand ; A. ; Loiseau ; A. ; Blavette ; D.
• 关键词：Atom probe ; Ti&ndash ; Al alloy ; Two phase Ti&ndash ; Al ; Lamellar structures
• 刊名：Materials Science and Engineering ; A
• 出版年：2002
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：April 15, 2002
• 卷：327
• 期：1
• 页码：40-46
• 文件大小：347 K

摘要

A Ti–48 at.%Al alloy has been investigated by means of atom probe field ion microscopy (APFIM) and transmission electron microscopy (TEM). Atom probe (AP) techniques have been used to determine the composition of the massive γ-phase (γ_m). The ultrafine lamellar structure, which consists of α₂- and γ-lamellae, has been also characterised. The α₂ plates in γ_m have been analysed with one-dimensional AP microscopy and observed in TEM. Their formation in γ_m seems to be induced by the presence of oxygen, which is rejected from the γ_m phase during the massive transformation. The influence of chemical order on the field evaporation process has also been studied for the L1₀-ordered structure of the γ_m phase.