含Fe或Sn的锆合金显微组织研究

Microstructure of Zr alloy containing Fe or Sn element

摘要:

本文研究了含少量Fe或Sn的锆合金显微组织,结果表明Zr-Fe二元合金中的Fe元素(≤1.0 wt.%),除极少量固溶外,基本上是以Zr₃Fe第二相的形式析出,而且随着Fe含量的增加,第二相种类不变,尺寸变大。Zr-Sn二元合金中添加的Sn(≤5.0 wt.%)是以完全固溶的状态存在于锆基体中,不会参与形成第二相粒子；添加Sn元素会阻碍Zr合金回复及再结晶进程。在Zr-Sn-Fe合金中,Sn元素的添加可以提高Fe在α-Zr中的固溶含量,并且通过阻碍Zr合金β相快冷时板条晶晶粒长大及Fe元素的迁移,影响Zr₃Fe第二相的尺度及分布,可以使其细化并分布更均匀。

Abstract:

The mutual effect of Fe and Sn on the microstructure of Zr alloys was investigated in the present work. It has been found that in Zr-Fe binary alloys (with Fe amount less than 1 wt.%), very few amount of Fe element was dissolved in Zr alloys while most of the Fe was precipitated as Zr₃Fe phase. Moreover, the dimension of Zr₃Fe increased with the Fe content. However, the Sn element added in the present work (≤5.0 wt.%) has been entirely dissolved in Zr alloys, while no precipitate containing Sn element was found. It also observed that the addition of the Sn element could inhabit the recovery and recrystallization process of Zr alloys. In Zr-Sn-Fe ternary alloys, the addition of Sn element could increase the solubility of Fe in Zr alloys, and inhabit the grain growth of lath crystal and migration of Fe element duing rapid cooling process of β-phase. Moreover, finer and more uniformly distributed Zr₃Fe phase were observed after addition of Sn element.