本文采用原位加热透射电子显微镜观察技术研究了非晶态Ni-P合金薄膜的动态晶化过程。实验结果表明,非晶态合金薄膜在等温退火时,首先在非晶态基体中产生微小的有序原子集团,并长大成取向无规的Ni_3P晶体微粒;然后是晶体的形成和长大。在晶体长大过程中这些晶体微粒通过切变(取向变化)直接沉积在晶体前沿上,而保持其结构形态不变。利用动态录像技术测量了晶化过程中的晶体长大过程,发现晶体在长大过程中有“台阶型”长大,这种“台阶型”长大过程对应于有序原子集团的切变沉积,不同温度下有序原子集团切变沉积使晶体长大速率的变化不同。
A technique for in situ heating TEM observation of the dynamiccrystallization process of amorphous Ni-P alloy foils is described. During isothermally annealing at medium temperatures, the fine ordered clusters were firstly ap-peared in the amorphous matrix, and the microcrystalline particles formed withrandom orientations, then crystals grew. In the process of crystal growth, thesemicrocrystalline particles deposited directly onto the crystals front by shearing (i. e.changing their orientations) with their configuratures unalterated. By means ofvideo camera, the "step-shaped" growth, correspnding to the ordered clusters shear-ing deposition, was found after measurement of crystal growing. With the shear-ing deposition under different temperatures, the rate change of crystal growthseemed to be different.
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