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1. 定向凝固Ti-46Al合金在不同生长速率和Nb含量下的固/液界面形态

Fig.1. Solid/liquid interface morphologies with 8%Nb (a1~e1), 9%Nb (a2~e2), 10%Nb (a3~e3) and growth rates V of 2 μm/s (a1~a3), 3 μm/s (b1~b3), 10 μm/s (c1~c3), 15 μm/s (d1~d3), 70 μm/s (e1~e3) in directional solidified Ti-46Al alloy