预压缩变形对Zr-Sn-Nb-Fe-Cr-Cu合金时效析出行为的影响

The effect of pre-compressed deformation on precipitation behavior of Zr-Sn-Nb-Fe-Cr-Cu alloy during aging

摘要:

本文采用扫描电子显微镜(SEM)和透射电子显微镜(TEM),系统研究了经6%和12%预压缩变形处理后Zr-Sn-Nb-Fe-Cr-Cu合金在时效过程中的第二相析出行为。研究结果发现,预变形量对Zr合金时效析出行为有显著的影响,在相同的时效条件下,预压缩变形量为12%的合金第二相粒子平均尺寸比6%的合金小约10nm；600℃下时效时,Zr合金的第二相粒子平均尺寸与预变形量呈线性反比关系。透射电镜分析结果表明,合金在500℃低温时效30min时先析出含有少量Cu元素的正交结构Zr3Fe相；当时效1800min后,除了大尺寸的Zr3Fe外还有六方结构的Zr(Fe,Nb)2析出,但预压缩变形量对Zr合金的第二相析出种类没有显著影响。

Abstract:

The precipitation behavior of second phase particles (SPPs) of Zr-Sn-Nb-Fe-Cr-Cu alloy after 6% and 12% pre-compressed deformation during aging was investigated by scanning electron microscope (SEM) and transmission electron microscope (TEM). It was found that the pre-deformation has a marked influence on precipitation behavior of Zr alloy. The average size of SPPs of 12% pre-compressed deformation samples was about 10nm larger than that of 6% pre-compressed deformation; and the average size of SPPs was linearly inversely proportional to the volume fraction of pre-deformation when the alloy was aging at 600℃. From TEM observation, the precipitates of orthorhombic Zr3Fe containing Cu element were detected when Zr alloys were aged at 550℃ for 30 minutes; the precipitates of hexagonal Zr(Fe,Nb)2 were also found with smaller size to Zr3Fe when the aging time prolonged to 1800 minutes. The pre-deformation has no remarkable impact on the type of SPPs.