caa a22 4500 46323054X CHVBK 20180405153240.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s10853-006-1351-6 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1351-6 Fracture behavior of notched specimens of TiAl alloys [Elektronische Daten] [J. Chen, R. Cao, J. Zhang, G. Wang] Fracture behavior of a two-phase TiAl alloy was investigated using notched specimens. Fracture surfaces and metallographic sections of surviving notch in double notched specimens are observed. The fracture process of notched specimens of TiAl alloys was described as that several inter-lamellar cracks initiate and extend directly from the notch root and propagate preferentially along the interfaces between lamellae and stop at various obstacles. With increasing applied load, cracks connect with each other and propagate further by translamellar cracks. The toughening mechanisms, which make the main crack difficult to propagate or cause it to be stopped, could be reducing the driving force for crack propagation. The higher toughness of near fully lamellar microstructure than that of finer duplex microstructure is attributed to the path of crack propagation. On the fracture surfaces of the finer duplex microstructure, more low-energy-spending interlamellar fracture facets are observed, which means that it is easier for crack to bypass a fine duplex lamellar grain with lamellae perpendicular to the main crack and to take a interlamellar path. Springer Science+Business Media, LLC, 2007 Chen J. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, 730050, Lanzhou, Gansu, China aut Cao R. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, 730050, Lanzhou, Gansu, China aut Zhang J. High Temperature Material Research Division, Central Iron and Steel Research Institute, 100081, Beijing, China aut Wang G. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, 730050, Lanzhou, Gansu, China aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/8(2007-04-01), 2820-2829 0022-2461 42:8<2820 2007 42 10853 https://doi.org/10.1007/s10853-006-1351-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1351-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen J. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, 730050, Lanzhou, Gansu, China aut NATIONALLICENCE 700 1- Cao R. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, 730050, Lanzhou, Gansu, China aut NATIONALLICENCE 700 1- Zhang J. High Temperature Material Research Division, Central Iron and Steel Research Institute, 100081, Beijing, China aut NATIONALLICENCE 700 1- Wang G. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, 730050, Lanzhou, Gansu, China aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/8(2007-04-01), 2820-2829 0022-2461 42:8<2820 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer