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Title: A mixture of massive and feathery microstructures of Ti48Al2Cr2Nb alloy by high undercooled solidification

A mixture of massive and feathery microstructures was observed in Ti48Al2Cr2Nb alloy subjected to the undercooled solidification rather than the heat treatments in most cases. Double recalescence events and primary β solidification confirmed that massive γ phase did not directly nucleate from the undercooled melt but formed during the solid-state transformations. It is believed that small white areas (aluminium-poor) along lamellar grain boundaries may be closely related to the formation of massive γ phase and feathery γ phase. High dislocation density and stacking faults were detected in massive γ phase by transmission electron microscopy. The high energy of defects and undercooling in the solid state phase transformation can provide sufficiently high driving force for the nucleation of massive γ phase. - Graphical abstract: Display Omitted - Highlights: • A mixture of massive and feathery microstructures was observed. • Massive γ formed during the solid-state transformations. • Defects and undercooling provide driving force for the nucleation of massive γ.
Authors:
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Publication Date:
OSTI Identifier:
22476037
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 100; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM; ALUMINIUM COMPOUNDS; CHROMIUM COMPOUNDS; DEFECTS; DISLOCATIONS; GRAIN BOUNDARIES; HEAT TREATMENTS; MICROSTRUCTURE; NIOBIUM COMPOUNDS; QUATERNARY ALLOY SYSTEMS; SOLIDIFICATION; SOLIDS; STACKING FAULTS; TITANIUM COMPOUNDS; TRANSFORMATIONS; TRANSMISSION ELECTRON MICROSCOPY