激光辐照Fe78Si9B13非晶合金晶化研究

在CO2激光散光斑直径20mm的情况下,分别选择在不同功率静置的条件下辐照Fe78Si9B13非晶带实现部分晶化·用穆斯堡尔谱、X射线衍射和扫描电镜对原始非晶样品(Fe78Si9B13)和晶化后样品的微观结构进行了分析·结果表明:在CO2激光散光斑直径一定的条件下(20mm),分别选择激光功率250W和300W辐照非晶Fe78Si9B13样品20s,非晶样品可以实现约6%和9%的晶化·激光辐照非晶Fe78Si9B13合金的晶化相为αFe(Si),样品发生了织构现象,晶粒沿(200)面大量析出·激光晶化相产生在非晶带表面晶化层中·在其他条件一定的情况下,样品的晶化量随着激光功率的增加而增加·

Crystallization of Amorphous Fe78Si9B13 Alloy Irradiated by CO2 Laser

The amorphous Fe78Si9B13 alloy was partially crystallized when it was irradiated by CO2 laser beam with 20 mm spot diameter for 20 sec at 250 W and 300 W as the laser power. The microstructures of the original amorphous Fe78Si9B13 samples and that of the crystallized samples were all analyzed by means of Mossbauer spectrum, XRD and SEM. The results showed that the amorphous Fe78Si9B13 alloy can be crystallized by 6% and 9% in α-Fe(Si) phase at 250 W and 300 W, respectively. It was found that a textural phenomenon takes place in samples, and a massive amount of grains were precipitated along (200) crystal face. The phase crystallized by laser beam forms in the crystallized surface layers of the amorphous Fe78Si9B13 alloy. Under otherwise definite conditions, the crystallized portion increases with increasing laser power.