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采用铜模吸铸法制备了Cu56.4Zr31.02Ti6.58Al6大块非晶合金(BMGs),并利用X射线衍射仪(XRD)、透射电子显微镜(TEM)和同步示差扫描量热仪(DSC)等手段对其晶体结构、晶化激活能和晶化机制进行了研究。利用y(a)和z(a)判据检测了不同晶化模型对于该BMGs初始晶化相晶化过程的适用性。结果显示:该BMGs初晶晶化产物为Cu10Zr7相,Starink-Zahra模型可以很好地描述其晶化机制。拟合参数λi不为零,故晶化过程中软碰撞作用不可忽视;Avrami指数n由2.5减小为2.3,其晶化过程为连续形核过程中伴随着晶核受扩散控制的三维方式长大,且形核速率不断减小。
Cu56.4Zr31.02Ti6.58Al6 bulk amorphous alloys (BMGs) were prepared by copper mold suction casting method. X-ray diffraction (XRD), transmission electron microscopy (TEM) and synchronous differential scanning calorimetry (DSC) And other means of its crystal structure, crystallization activation energy and crystallization mechanism were studied. The applicability of different crystallization models for the initial crystallization phase of BMGs was examined using the y (a) and z (a) criteria. The results show that the primary crystallization product of BMGs is Cu10Zr7 phase, and the Starink-Zahra model can describe its crystallization mechanism well. The fitting parameter λi is not zero, so the soft collision in the crystallization process can not be ignored; the Avrami index n is reduced from 2.5 to 2.3, and its crystallization process is the three-dimensional growth accompanied by nucleation and diffusion control in the continuous nucleation process , And the rate of nucleation decreases.