Fe_(76.5)Cu_1Si_(13.5)B_9非晶合金晶化过程的X射线衍射研究

X-RAY DIFFRACTION STUDY ON CRYSTALLIZATION OF AMORPHOUS Fe (76.5)Cu_1Si_(13.5)B_9 ALLOY

Fe_(76.5)Cu_1Si_(13.5)B_9非晶合金在晶化过程中析山的α-Fe固溶体(α相)的X射线衍射峰存在不对称性并随退火温度而变化,对α相衍射峰进行分峰拟合证实,Cu原子可以促进α相形核并固溶其中,合金晶化与原始态中残存晶核无关,α相晶粒中Cu含量的不同导致衍射峰的不对称性,键合能准化学近似计算结果表明,Cu原子降低了周围原子的迁移势垒,导致合金的晶化首先在含Cu量较高的区域开始,使晶化温度降低。

X-ray diffraction peak for α-Fe solid solution (α-phase) precipitates during crystallization of Fe_(76.5)Cu_1Si_(13.5)B_9 amorphous alloy was asymmetrical and dependent on annealing temperature. The fitting results for (200)_α peak indicated that Cu atoms may promote the nucleation of α-phase and dissolve in it so the crystallization has no relation with the as-quenched α phase. The bond energy between atoms in alloy shows that Cu atoms interact slightly with others, as a result, it decreases the removal energy barrier and the crystallization initiates in the Cu-rich region, and results in the decrease of crystallization temperature.