Ultrafine fully-lamellar structures in two-phase {gamma}-TiAl alloys

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Special ultrafine fully lamellar microstructures have been found recently in {gamma}-TiAl alloys with 46-48% Al processed or heat treated above the {alpha}-transus temperature (T{alpha}). Hot extrusion above T{alpha} also produces a refined colony or grain size. Refined-colony/ultrafine-lamellar (RC/UL) microstructures produce an excellent combination of RT ductility and high-temperature strength in Ti-47Al-2Cr-2Nb (at.%) alloys. UL structures also have regularly alternating {gamma} and {alpha}{sub 2} lamellae, such that they are dominated by {gamma}/{alpha}{sub 2} interfaces with relatively few {gamma}/{gamma} twin boundaries. Focus of this study is on how changes in processing parameters or alloy composition affect formation of the UL structure, particularly ... continued below

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5 p.

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Maziasz, P.J. & Liu, C.T. December 31, 1996.

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Special ultrafine fully lamellar microstructures have been found recently in {gamma}-TiAl alloys with 46-48% Al processed or heat treated above the {alpha}-transus temperature (T{alpha}). Hot extrusion above T{alpha} also produces a refined colony or grain size. Refined-colony/ultrafine-lamellar (RC/UL) microstructures produce an excellent combination of RT ductility and high-temperature strength in Ti-47Al-2Cr-2Nb (at.%) alloys. UL structures also have regularly alternating {gamma} and {alpha}{sub 2} lamellae, such that they are dominated by {gamma}/{alpha}{sub 2} interfaces with relatively few {gamma}/{gamma} twin boundaries. Focus of this study is on how changes in processing parameters or alloy composition affect formation of the UL structure, particularly the {alpha}{sub 2} component.

Physical Description

5 p.

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INIS; OSTI as DE97003106

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  • 1996 Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 2-6 Dec 1996

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  • Other: DE97003106
  • Report No.: CONF-961202--62
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 447978
  • Archival Resource Key: ark:/67531/metadc685260

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  • December 31, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 14, 2015, 12:45 a.m.

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Maziasz, P.J. & Liu, C.T. Ultrafine fully-lamellar structures in two-phase {gamma}-TiAl alloys, article, December 31, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc685260/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.