Analytical TEM investigations on concentration gradients surrounding Ni₄Ti₃ precipitates in Ni–Ti shape memory material

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• 作者：Zhiqing Yang ; Wim Tirry and Dominique Schryvers
• 关键词：NiTi ; Concentration ; EELS ; EFTEM ; EDX
• 刊名：Scripta Materialia
• 出版年：2005
• 期刊代码：157_13596462
• 类别：et
• 出版时间：2005
• 卷：52
• 期：11
• 页码：1129-1134
• 文件大小：433 K

摘要

Concentration gradients surrounding Ni₄Ti₃ precipitates grown by appropriate annealing in a Ni₅₁Ti₄₉ B2 austenite matrix are investigated by a combination of analytical TEM techniques. A Ni depleted zone in the surrounding matrix up to 150 nm away from the matrix–precipitate interface was detected. The size and concentration change of the depletion zone perfectly compensate for the excess Ni in the precipitate. Moreover, since different precipitates are often found in nanoscale proximity, depletion zones from different precipitates can reinforce one another in certain regions.