Nb含量对Zr-xNb合金显微组织及再结晶过程的影响

Influence of Nb Content on Microstructure and Recrystallization Process of Zr-xNb Alloys

通过透射电子显微镜、光学显微镜、显微硬度计等手段研究了Nb含量对Zr-xNb(x=0,0.3,0.7,1.0)合金显微组织及再结晶过程的影响。结果显示,随着Nb含量的增加,Zr-xNb合金中第二相的数量迅速增多,平均尺寸逐渐减小,其再结晶过程逐渐减慢;尤其在Zr-1Nb合金中,第二相对再结晶过程的阻碍作用明显加强。Zr-0.3Nb合金中的第二相主要为Zr(Nb,Fe,Cr)2,Zr-1Nb中第二相主要为β-Nb。

The influences of Nb content on the microstructure and recrystallization process of Zr-x Nb（x=0,0.3,0.7,1.0） alloys were studied by transmission electron microscopy（TEM）,optical microscopy（OM） and Vickers micro-hardness testing.The results show that with increasing Nb content the quantity of the precipitates increases and the mean size of the precipitate particles decreases.Meanwhile,the recrystallization process is slowed down by the precipitates,especially in the case of Zr-1Nb alloy.The main precipitates were found to be Zr（Nb,Fe,Cr）2 and β-Nb in Zr-0.3 Nb and Zr-1Nb,respectively.