定向凝固高Nb含量TiAl合金微观组织演化与溶质偏析规律<sup>*</sup>

定向凝固高Nb含量TiAl合金微观组织演化与溶质偏析规律^*

李勇¹,刘国怀¹,王昭东¹,付天亮¹,李新中²,苏彦庆²,郭景杰²,傅恒志²

MICROSTRUCTURE EVOLUTION AND SOLUTE SEGREGATION IN DIRECTIONALLY SOLIDIFIED TiAl ALLOYS WITH HIGH Nb CONTENT

Yong LI¹,Guohuai LIU¹,Zhaodong WANG¹,Tianliang FU¹,Xinzhong LI²,Yanqing SU²,Jingjie GUO²,Hengzhi FU²

图5. 定向凝固Ti-46Al-Nb合金不同相变路径下溶质偏析及微观组织演化

Fig.5. Solute segregation and microstructure evolution during the phase transition process of L→L+b→L+b+a (a1~c1) and L→L+b→b+a (a2~c2) in directionally solidified Ti-46Al-Nb alloy at V=5 μm/s