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4. 定向凝固Ti-46Al-8Nb合金中不同相变过程中的溶质偏析特征和EDS

Fig.4. Solute segregations (a1~c1) and line scan EDS along the black line (a2~c2) during the different phase transition processes of directionally solidified Ti-46Al-8Nb alloy in L+b region (a1, a2), L+b+a region (b1, b2) and a₂/g+B2 region (c1, c2)