首页|Effect of V on the microstructure and brittle-to-ductile transition of directionally solidified high-Nb TiAl alloy

Effect of V on the microstructure and brittle-to-ductile transition of directionally solidified high-Nb TiAl alloy

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  • NSTL
  • Elsevier
? 2021The influence of V addition on the microstructure and high-temperature tensile performance of Ti46Al7Nb0.4W0.6Cr alloy, fabricated by using the cold crucible directional solidification method, is comprehensively investigated. The results show that V addition can refine the columnar grain width and promote the brittle-to-ductile transition (BDT) of the TiAl alloy. After the addition of 2 at.% V, the ultimate tensile strength and elongation increased at 973–1173 K. The fracture mode change from interlamellar to translamellar; this is attributed to the decrease in the angle between the lamellar alignment and growth direction. The BDT behaviour of V-containing TiAl alloy at 1073 K results from the transition from dislocation-dominated to twin-dominated deformation as indicated by transmission electron microscopic investigations.

Brittle-to-ductile transitionDeformation mechanismDirectional solidificationFracture morphologyHigh-temperature tensile propertyTiAl alloy

Xu X.、Ding H.、Huang H.、Liang H.、Chen R.、Guo J.、Fu H.

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National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and Engineering Harbin Institute of Technology

2022

10.1016/j.intermet.2021.107455

Intermetallics

Intermetallics

EISCI
ISSN：0966-9795
年,卷(期)：2022.142
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