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采用高分辨率电镀观测铸态Zr60Al15Ni25的微观结构。X-射线分析表明,铸态Zr60Al15Ni25合金为非晶态,而通过高分辨电镜发现非晶合金中存在大量的短程有序区。实验发现,非晶合金的无序程度与相对应的母合金铸锭的凝固组织密切相关。通过差示扫描量热法研究非晶合金在线性加热和等温条件下的晶化动力学。结果表明:非晶合金的晶化是预先存在的短程有序区作为晶核长大开始的三维扩散控制的过程。Zr60Al15Ni25块体非晶合金的无序程度对其晶化动力学具有明显的影响,即无序程度越大,非晶合金的晶化越迟缓。
The microstructure of as-cast Zr60Al15Ni25 was observed by high resolution electroplating. X-ray analysis showed that the as-cast Zr60Al15Ni25 alloy was amorphous, while the high-resolution electron microscopy found a large number of short-range ordered regions in the amorphous alloy. The experimental results show that the degree of disorder of amorphous alloy is closely related to the solidification structure of the corresponding parent alloy ingot. Crystallization kinetics of amorphous alloys under linear heating and isothermal conditions were investigated by differential scanning calorimetry. The results show that the crystallization of amorphous alloy is the pre-existing short-range ordered region as the process of three-dimensional diffusion control starting from nucleation. The degree of disorder of Zr60Al15Ni25 bulk amorphous alloy has a significant influence on the crystallization kinetics. That is, the greater the degree of disorder, the slower the crystallization of amorphous alloy.