FRACTURE PROPERTIES OF GAMMA-BASE TIAL ALLOYS WITH LAMELLAR MICROSTRUCTURE AT ROOM-TEMPERATURE

Authors
GNANAMOORTHY R MUTOH Y MASAHASHI N MIZUHARA Y
Citation
R. Gnanamoorthy et al., FRACTURE PROPERTIES OF GAMMA-BASE TIAL ALLOYS WITH LAMELLAR MICROSTRUCTURE AT ROOM-TEMPERATURE, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 184(1), 1994, pp. 37-44
Citations number
14
Categorie Soggetti
Material Science
Journal title
Materials science & engineering. A, Structural materials: properties, microstructure and processing → ACNP
ISSN journal
09215093
Volume
184
Issue
1
Year of publication
1994
Pages
37 - 44
Database
ISI
SICI code
0921-5093(1994)184:1<37:FPOGTA>2.0.ZU;2-5
Abstract
The mechanical properties of gamma-base titanium aluminides depend str ongly on the microstructural parameters. Gamma-base titanium aluminide s with fully lamellar microstructure possess excellent fracture proper ties compared with other microstructures. Binary Ti-46Al and niobium a lloyed Ti-47Al-3Nb were used to investigate the fracture behavior of g amma-base titanium aluminides. The addition of niobium refined the gra in size of the material and thereby increased the flexural strength, b ut had no influence on the fracture toughness. The fatigue crack growt h behavior (DELTAK vs. da/dN) of the niobium alloyed material was supe rior to that of the binary material. Roughness-induced crack closure p lays a significant role in the lamellar microstructure material. Tough ening due to microcracks, crack branching, and crack bridging by uncra cked ligaments was also observed in the test materials.