Lamellar orientation dependent anisotropy of fracture toughness in γ-base titanium aluminide

Three specimens of gamma -base titanium aluminide (Ti--47.2Al) taken from a unidirectional columnar region of an ingot were used to study the anisotropy in fracture toughness and its correlation with lamellar orientation. Each of the specimens had a different notch orientation. Uniformity of the lam...

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Bibliographic Details
Published in:Scripta metallurgica et materialia 1992-05, Vol.26 (9), p.1405-1410
Main Authors: Mitao, S., Isawa, T., Tsuyama, S.
Format: Article
Language:English
Subjects:
360103 - Metals & Alloys- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
Applied sciences
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
Exact sciences and technology
FCC LATTICES
FRACTURE MECHANICS
FRACTURE PROPERTIES
Fractures
HCP LATTICES
HEXAGONAL LATTICES
INTERMETALLIC COMPOUNDS
MATERIALS SCIENCE
MECHANICAL PROPERTIES
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
MECHANICS
Metals. Metallurgy
ORIENTATION
TITANIUM ALLOYS
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Summary:Three specimens of gamma -base titanium aluminide (Ti--47.2Al) taken from a unidirectional columnar region of an ingot were used to study the anisotropy in fracture toughness and its correlation with lamellar orientation. Each of the specimens had a different notch orientation. Uniformity of the lamellar direction was determined by carrying out (111) pole figure analysis. Poor toughness was demonstrated on the plane parallel to the lamellae. Fracture toughness on the plane parallel to alpha sub 2 / gamma lamellae was approx 10 MPa m exp 0.5 , while that on the plane perpendicular to the lamellae was approx 35 MPa m exp 0.5 . Fracture on the plane parallel to the lamellae was considered to be due to interlamellar separation.
ISSN:0956-716X
DOI:10.1016/0956-716X(92)90657-Z