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本文通过对室温时效二年的Cu-14Al-4Ni形状记忆合金进行电子显微研究,发现形状记忆合金中的马氏体在室温产生缓慢的亚结构变化,出现定向有序畴和晶界过渡区,孪晶界被破坏。矩形网格状有序畴产生并长大。首次观察到周期性反相结构与反相畴呈现在同一操作矢量下。用电子衍衬和能谱作原位观察,发现晶界出现溶质原子偏聚和位错缠结,晶内有序区出现周期性层错。基体、有序区和晶界的溶质原子Al的浓度呈现递增形式,其中基体贫Al,晶界富Al。
In this paper, the electron microscopic study of Cu-14Al-4Ni shape memory alloy aged at room temperature for two years showed that the martensite in the shape memory alloy produced a slow substructure change at room temperature and the orientation ordered domains and the transition zone , Twin world is destroyed. Rectangular grid-like ordered domains grow and grow. It is observed for the first time that periodic inverted structures and inverted domains appear under the same operating vector. Using electron diffraction and energy spectrum for in-situ observation, it was found that solute atoms are segregated and dislocated at the grain boundaries, and periodic faults occur in the ordered regions in the grains. The concentration of solute atom Al in the matrix, ordered region and grain boundary showed an increasing form, in which the matrix was Al-depleted and the grain boundary was Al-rich.