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Effect of heat treatment at (β+γ) two phase region on fracture toughness in tiAl intermetallic compound
- 1.0509804 - ÚFM 2024 RIV CH eng C - Konferenční příspěvek (zahraniční konf.)
Hasegawa, M. - Tomohiro, I. - Dlouhý, Ivo
Effect of heat treatment at (β+γ) two phase region on fracture toughness in tiAl intermetallic compound.
New Methods of Damage and Failure Analysis of Structural Parts. Zurich: Trans Tech Publication, 2019 - (Strnadel, B.), s. 21-26. Key Engineering Materials, 810. ISBN 978-3-0357-1447-0. ISSN 1013-9826.
[New Methods of Damage and Failure Analysis of Structural Parts. Ostrava (CZ), 10.09.2018-14.09.2018]
Institucionální podpora: RVO:68081723
Klíčová slova: TiAl intermetallic compound * β phase precipitation * fully lamellar * fracture toughness
Obor OECD: Materials engineering
https://www.scientific.net/KEM.810.21
Effects of holding temperature and time at (β+γ) two phase region on the microstructure of
fully lamellar Ti-46Al-7Nb-0.7Cr-0.2Ni-0.1Si (mol%) intermetallic compounds are studies. Fully
lamellar microstructure is observed after homogenization heat treatment for 3.6 ks at 1643 K (α
single phase state). Fine β phased grains precipitate at fully lamellar structure after heat treatment of
homogenized material at 1373 K. Holding the homogenized material for 72 ks at 1373 K decompose
partially the lamellar structure. Heat treatment of homogenized material at 1273 K also precipitates
the fine β phased grains in fully lamellar structure. In this temperature range, decomposition of
lamellar structure is not observed up to 72 ks heat treatment. The toughness of homogenized material
is ~ 15 MPa√m. Heat treatment of homogenized material at 1373 K and 1273 K for 3.6 ks indicates
maximum fracture toughness in each temperature range. This may due to the precipitation of fine β
phased grains. The fracture toughness decreases with the increase in heat treatment time up to 18 ks
and/or 36 ks. Then, the value of fracture toughness became constant. Specimens heat treated at 1373
K for 36 ks and 72 ks indicate lower toughness than homogenized material. However, when the
specimens are heat treated at 1273 K for 36 ks and 72 ks, the toughness is higher than that of
homogenized material. This change is due to the decomposition of the lamellar structure.
Trvalý link: http://hdl.handle.net/11104/0301470
Počet záznamů: 1