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本文通过差分比热测量,在连续升温条件下研究了金属玻璃Zr_(66.7)Ni_(33.3)的结晶化行为。发现:随着升温速率的增大,不仅使结晶化温度向高温方向移动,完成整个结晶化过程的温区明显地被加宽;而且其放热曲线从单峰结构过渡到双峰结构,两个峰的相对高度也发生消长变化。对一些从典型状态快速淬火的样品作X射线衍射分析,其结果表明:所包含的结晶相均为四角结构的 Zr_2Ni。可以认为:所观测到的现象很可能是与结晶化过程中结晶成核和生长的不同速率相联系的。
In this paper, the crystallization of Zr 66.7 Ni 33.3 was studied by differential specific heat measurement under continuous heating conditions. It is found that with the increase of the heating rate, not only the crystallization temperature is shifted to the high temperature, but also the temperature range in which the crystallization process is completed is obviously broadened. Moreover, the exothermic curve transitions from unimodal to bimodal structure, The relative height of the peaks also varies in length. The results of X-ray diffraction analysis of some samples rapidly quenched from the typical state show that the crystalline phases contained are tetragonal Zr 2 Ni. It is believed that the observed phenomena are most likely related to the different rates of crystallization and growth of crystals during the crystallization process.