Applications of advanced transmission electron microscopic techniques to Ni–Ti based shape memory materials

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• 作者：Schryvers ; Dominique ; Potapov ; Pavel ; Santamarta ; Rubé ; n ; Tirry ; Wim
• 关键词：Ni&ndash ; Ti ; HRTEM ; Precipitation ; Crystallisation
• 刊名：Materials Science and Engineering ; A
• 出版年：2004
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：July 25, 2004
• 卷：378
• 期：1-2
• 页码：11-15
• 文件大小：378 K

摘要

In the present contribution some recent results of advanced transmission electron microscopy applications on Ni–Ti based shape memory materials will be reviewed. These will include the precipitate growth in binary Ni₅₁Ti₄₉ in which lens-shaped Ni₄Ti₃ precipitates are grown and which induce particular strain fields in the surrounding matrix influencing any ensuing martensitic transformation. Special image treatment methods are used to measure the actual lattice deformations close to these precipitates. Also the crystallisation process occurring in Ti₅₀Ni₂₅Cu₂₅ melt-spun ribbons is investigated in which the focus is on the domain, interface and surface structure of micron-sized spherical B2 particles growing inside the amorphous material. When particles grow larger, martensite plates as well as small planer defects are observed.