Microstructure and tensile properties of hot fogred high Nb containing TiAl based alloy with initial near lamellar microstructure

High Nb containing TiAl based alloy with a nominal composition of Ti–44Al–8Nb–0.2W–0.2B–Y (in at%) exhibiting near lamellar microstructure was fabricated. Cylindrical blanks were quasi-isothermal forged at 1275°C for 0.05s−1, with a total reduction of 70%. The as-forged blanks were furnace-cooled (F...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-08, Vol.642, p.16-21
Main Authors: Zhang, S.Z., Zhang, C.J., Du, Z.X., Hou, Z.P., Lin, P., Chen, Y.Y.
Format: Article
Language:English
Subjects:
Blanks
EBSD
Intermetallic compounds
Intermetallics
Mechanical characterization
Microstructure
Orientation relationships
Phase boundaries
Recrystallization
Tensile properties
Thermomechanical processing
Titanium aluminides
Titanium base alloys
Titanium compounds
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cited_by cdi_FETCH-LOGICAL-c333t-3832ed4ae073f63c3683af54882168136e68c3b3a4b373fe5e11149022e4fd3d3
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
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creator Zhang, S.Z.
Zhang, C.J.
Du, Z.X.
Hou, Z.P.
Lin, P.
Chen, Y.Y.
description High Nb containing TiAl based alloy with a nominal composition of Ti–44Al–8Nb–0.2W–0.2B–Y (in at%) exhibiting near lamellar microstructure was fabricated. Cylindrical blanks were quasi-isothermal forged at 1275°C for 0.05s−1, with a total reduction of 70%. The as-forged blanks were furnace-cooled (FCed) or air-cooled (ACed). The microstructure of the as-forged alloy mainly consists of remnant lamellar colonies (RL) and broken-down (BD) area caused by inhomogeneous deformation. Lamellar orientation and α2 lath thickness strongly affect the deformation of lamellar colonies. In the RL structure, the α2 phase s are remain in lath states and the γ laths recrystallized. The Blackburn relationship between the previous α2 lath and the γ lath in the RL structure is disrupted. Meanwhile, stress induced α→γ phase transformation generates the optimal perfect Blackburn relationship between the parent α2 lath and newborn γ grains. Cooling rate significantly affects the as-forged microstructure, thereby influencing the bulging rate of γ phase boundaries into α2 phases. Cooling rate also influences the tensile properties of the alloy.
doi_str_mv 10.1016/j.msea.2015.06.066
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A, Structural materials : properties, microstructure and processing</jtitle><date>2015-08-26</date><risdate>2015</risdate><volume>642</volume><spage>16</spage><epage>21</epage><pages>16-21</pages><issn>0921-5093</issn><eissn>1873-4936</eissn><notes>ObjectType-Article-1</notes><notes>SourceType-Scholarly Journals-1</notes><notes>ObjectType-Feature-2</notes><notes>content type line 23</notes><abstract>High Nb containing TiAl based alloy with a nominal composition of Ti–44Al–8Nb–0.2W–0.2B–Y (in at%) exhibiting near lamellar microstructure was fabricated. Cylindrical blanks were quasi-isothermal forged at 1275°C for 0.05s−1, with a total reduction of 70%. The as-forged blanks were furnace-cooled (FCed) or air-cooled (ACed). The microstructure of the as-forged alloy mainly consists of remnant lamellar colonies (RL) and broken-down (BD) area caused by inhomogeneous deformation. Lamellar orientation and α2 lath thickness strongly affect the deformation of lamellar colonies. In the RL structure, the α2 phase s are remain in lath states and the γ laths recrystallized. The Blackburn relationship between the previous α2 lath and the γ lath in the RL structure is disrupted. Meanwhile, stress induced α→γ phase transformation generates the optimal perfect Blackburn relationship between the parent α2 lath and newborn γ grains. Cooling rate significantly affects the as-forged microstructure, thereby influencing the bulging rate of γ phase boundaries into α2 phases. Cooling rate also influences the tensile properties of the alloy.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.msea.2015.06.066</doi><tpages>6</tpages></addata></record>
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subjects Blanks
EBSD
Intermetallic compounds
Intermetallics
Mechanical characterization
Microstructure
Orientation relationships
Phase boundaries
Recrystallization
Tensile properties
Thermomechanical processing
Titanium aluminides
Titanium base alloys
Titanium compounds
title Microstructure and tensile properties of hot fogred high Nb containing TiAl based alloy with initial near lamellar microstructure
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