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利用电弧熔炼及铜模快速铸造法制备Zr41.2Ti13.8Cu12.5Ni10Be22.5块体非晶合金,通过热膨胀法测试晶化过程,与差示扫描量热法进行对比。通过高分辨电子显微镜观察晶化初期晶核的形成和长大规律。结果表明,热膨胀系数测试块体非晶合金的结构弛豫、玻璃转变、过冷液相区、晶化开始温度和晶化过程中不同晶化峰温度与差示扫描量热法测试结果完全吻合。在高分辨像中观察到近似球形的纳米晶粒和晶格条纹。然而,在高分辨像中很难辨认出晶化初期微小的晶化区域,只有对其进行快速傅里叶变换才能发现微小区域的晶化基本特征。
Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk amorphous alloy was prepared by arc melting and rapid casting of copper mold. The crystallization process was tested by thermal expansion method and compared with the differential scanning calorimetry. High-resolution electron microscopy was used to observe the formation and growth of nuclei at the initial stage of crystallization. The results show that the structural relaxation, glass transition, supercooled liquid region, crystallization initiation temperature and crystallization temperature during the crystallization process of the bulk amorphous alloy are in good agreement with the results of differential scanning calorimetry . Nearly spherical nanocrystals and lattice fringes are observed in high resolution images. However, in the high-resolution image, it is difficult to identify the tiny crystallization area at the initial stage of crystallization. Only the fast Fourier transform can be used to find out the basic characteristics of the crystallization in the tiny area.