制备冷速对Fe40Ni40P14B6非晶态合金晶化动力学的影响  

Effect of preparation cooling rate on crystallization kinetics of Fe40Ni40P14B6 amorphous alloy

作　　者：赵齐笑 夏梦佳 刘晓璇 刘丛 李强[1] 

机构地区：[1]新疆大学物理科学与技术学院

出　　处：《材料热处理学报》2018年第2期139-144,151,共7页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51561028);新疆大学国家级大学生创新创业训练计划项目(201610755050)

摘　　要：通过J-quenching和melt-spinning技术制备Fe40Ni40P14B6块体非晶态合金和非晶薄带样品。利用差示扫描量热法对这两个不同制备冷速下获得的非晶态合金样品的热力学行为以及晶化过程的非等温晶化动力学行为进行研究。结果表明：两种样品的玻璃转变温度和初始晶化温度没有明显的差别,但非晶薄带总的晶化放热焓要大于块体非晶态合金的。随着制备冷速的降低,样品的表观激活能增加,两种制备技术获得的非晶态合金的局域Avrami指数（n）大部分处于1.5～2.5之间,表明晶化机制为受扩散控制的共晶型长大,且小尺寸晶粒长大的同时还伴有形核,形核率随时间减小。样品的n指数同样随着制备冷速的降低而减小,低制备冷速下获得的样品具有较高程度的短程有序。Fe40Ni40P14B6 bulk amorphous alloy and melt-spun ribbon samples were prepared by J-quenching and melt-spinning techniques,respectively. The thermal behavior and non-isothermal crystallization kinetics of the two Fe40Ni40P14B6 amorphous alloys prepared by different cooling rates were studied by differential scanning calorimetry（ DSC）. The results show that there is no obvious difference between the glass transition temperature and the initial crystallization temperature of the two amorphous alloy samples,but the total crystallization exothermic enthalpy of the melt-spun ribbon is greater than that of the bulk amorphous alloy. With the decreasing of the preparation cooling rate,the apparent activation energy（ Eapp） of the samples increases,and the local Avrami exponent（ n） of the two Fe40Ni40P14B6 amorphous alloy samples is mostly in the range of 1. 5-2. 5 in the crystallization process,showing that the crystallization mechanism for eutectic growth is controlled by diffusion,the growth of small size grain is accompanied by nucleation,and the nucleation rate decreases with time. In addition,the n value of the amorphous alloy samples decreases with the decreasing of the preparation cooling rate,and the sample prepared with low cooling rate has higher degree of short-range order.

关 键 词：Fe40Ni40P14B6非晶态合金 制备冷速 表观激活能 非等温晶化动力学 局域Avrami指数 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG111.3[金属学及工艺—合金]