Microstructure development during directional solidification of Ti–45Al–8Nb alloy

Microstructure development and phase transition were investigated by quenching during directional solidification (DS) of Ti–45Al–8Nb (at.%) alloy. The solidification route and process can be controlled by adjustment of the solidification condition. A coexisted region of L + β + α was found at a low...

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Bibliographic Details
Published in:Journal of alloys and compounds 2010-09, Vol.506 (1), p.115-119
Main Authors: Ding, X.F., Lin, J.P., Zhang, L.Q., Wang, H.L., Hao, G.J., Chen, G.L.
Format: Article
Language:English
Subjects:
Alloy development
Cold working, work hardening
annealing, quenching, tempering, recovery, and recrystallization
textures
Cross-disciplinary physics: materials science
rheology
Directional solidification
Exact sciences and technology
Growth from melts
zone melting and refining
Intermetallics
Liquids
Materials science
Methods of crystal growth
physics of crystal growth
Microstructure
Phase transformations
Phase transitions
Physics
Quenching
Solidification
Titanium base alloys
Transformations
Treatment of materials and its effects on microstructure and properties
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Summary:Microstructure development and phase transition were investigated by quenching during directional solidification (DS) of Ti–45Al–8Nb (at.%) alloy. The solidification route and process can be controlled by adjustment of the solidification condition. A coexisted region of L + β + α was found at a low growth rate. The high temperature α phase, produced by peritectic transformation or β → α solid-state transformation or direct solidification from interdendritic liquid, was determined by the solidification conditions and can be identified by checking the β-segregation pattern in dendritic region. Lamellar orientation control was achieved when the interdendritic α grew on the top of peritectically formed α. High temperature α can be aligned continuously although α partly grew from the region of primary β interdendrite. Some elongated B2 particles were generated due to β-stablizers were centralized in interdendritic liquid during DS process. The volume fraction of the B2 particle decreased with decreasing growth rate ( V).
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2010.06.151