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首页> 外文期刊>Journal of Applied Crystallography >Martensite adaption through epitaxial nano transition layers in TiNiCu shape memory alloys
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Martensite adaption through epitaxial nano transition layers in TiNiCu shape memory alloys

机译：TiNiCu形状记忆合金中通过外延纳米过渡层的马氏体适应

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Titanium-rich TiNiCu shape memory thin films with ultralow fatigue have been analysed for their structural features by transmission electron microscopy. The stabilization of austenite (B2) and orthorhombic martensite (B19) variants epitaxially connected to Ti2Cu-type precipitates has been observed and found responsible for the supreme mechanical cycling capability of these compounds. Comprehensive ex situ and in situ cooling/heating experiments have demonstrated the presence of an austenitic nanoscale region in between B19 and Ti2Cu, in which the structure shows a gradual transition from B19 to B2 which is then coupled to the Ti2Cu precipitate. It is proposed that this residual and epitaxial austenite acts as a template for the temperature-induced B2 <-> B19 phase transition and is also responsible for the high repeatability of the stress-induced transformation. This scenario poses an antithesis to residual martensite found in common high-fatigue shape memory alloys.
机译：通过透射电子显微镜分析了具有超低疲劳度的富钛TiNiCu形状记忆薄膜的结构特征。观察到外延连接到Ti2Cu型沉淀物的奥氏体（B2）和正交晶马氏体（B19）变体的稳定性，发现这些化合物具有最高的机械循环能力。全面的异位和原位冷却/加热实验表明，在B19和Ti2Cu之间存在奥氏体纳米级区域，其中该结构显示了从B19到B2的逐渐过渡，然后过渡到Ti2Cu沉淀物。提出该残余奥氏体和外延奥氏体充当温度引起的B2→B19相变的模板，并且还负责应力引起的相变的高重复性。这种情况与常见的高疲劳形状记忆合金中发现的残余马氏体相反。

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