Atomically resolved chemical ordering at the nm-thick TiO precipitate/matrix interface in V-4Ti-4Cr alloy

作者：Impagnatiello A^*; Hernandez Maldonado D; Bertali G; Prestat E; Kepaptsoglou D; Ramasse Q; Haigh S J; Jimenez Melero E

来源：Scripta Materialia, 2017, 126: 50-54.

DOI：10.1016/j.scriptamat.2016.08.016

• Refractory metal
• Crystalline oxides
• Lattice defects
• High-resolution electron microscopy
• Nuclear fusion reactor

We have used advanced analytical electron microscopy to characterise the local structure and chemistry at the interface between nm-thick TiO precipitates and the V-based matrix in a V-4Ti-4Cr alloy. Our results reveal the presence of an intergrowth between the fcc TiO and bcc vanadium structures, with a repeat lattice distance that equals 2.5 times the vanadium lattice parameter along the c-axis. Our atomic resolution analysis of the interface will impact the mechanistic understanding of its interaction with interstitials and radiation-induced lattice defects, and consequently trigger the development of improved alloy structures with interfaces engineered for enhanced radiation tolerance.

• 出版日期2017-1-1