非晶合金激波晶化的DSC研究

Study of Amorphous Alloys of Shock Wave Crystallization by DSC

本文应用升温、等温和重复加热的DSC技术 ,对FeSiB ,FeMoSiB及FeCuNbSiB等几种非晶合金的激波晶化和退火晶化作了对比研究。结果表明 ,尽管激波晶化时间极短 ,仅为退火晶化时间的千万分之一 (甚至更短 ) ,但晶化度却极高 ,接近 10 0 %。激波晶化形成多种成分和结构都不同于母相的纳米结晶相 ,形式上很像扩散性相变 ,然而其相变速率却是退火转变的千万倍 ,甚至更高 !而且生成相十分稳定 ,这一现象用传统的固态扩散相变理论很难解释。激波晶化是一种新的晶化形式 。

Shock wave and annealing crystallization of amorphous alloys FeMoSiB and FeCuNbSiB were studied by isothermal and non isothermal DSC technique It was found that the shock wave crystallization is perfect and the fraction crystallized is very close to 100%,though the period of crystallization is very short,only about 10 -7 ～10 -8 s of the annealing’s Their produced phases are different from the parent(phase) in structure and composition,while the shock wave crystallization is similar to the diffusion solid state phase transition in form However,it is very difficult to explain the high velocity of transformation by the diffusion theory of solid state phase transition The shock wave crystallization of amorphous alloy is a new crystallization form and a new nano technique