Effects of loading rate on damage and fracture behavior of TiAl alloys

Microstructure and mechanical properties of a spark plasma sinteredTi–45Al–8.5Nb–0.2W–0.2B–0.1Y alloy

“…It has been indicated [29] that for the DP or NL specimens the nucleation sites of the microcracks are expected to be at the a 2 /g interfaces or from the g grains in tensile testing. Due to the fine grain size of the DP structure, the cracks tend to propagate via an interlamellar mode with relatively low resistance.…”

Centrifugal precision cast TiAl turbocharger wheel using ceramic mold

“…TiAl-based alloy is about 4 g/cm 3 which is about half of that of commonly used Ni-based superalloys, and therefore has attracted broad attention as potential candidates for high-temperature structural application in the fields of turbocharger manufacture (Jovanovic et al, 2005;Tetsui and Ono, 1999;Nakagawa et al, 1992). Due to low density (3.8 g/cm 3 ), high specific strength, high Young's modulus and excellent oxidation resistance at high temperatures, they represent a good alternative for nickel-based superalloys (Zollinger et al, 2007;Qu and Wang, 2007;Cao et al, 2007). Moreover, TiAl-based alloys consist of the major ␥-phase and minor ␣ 2 -phase, are nearly equal to Ni-based superalloys for turbine blades in specific tensile strength and specific creep strength but slightly inferior to superalloys in oxidation resistance above 700 • C (Jovanovic et al, 2005; Yamaguchi et al, 2000).…”

Recent Results on the Brittle Fracture of Terfenol-D Specimens under Magnetic Field

“…It has been noted that, in the presence of the magnetic field, the average fracture loads at 0.05, 0.50 and 3.0 Ns −1 are decreased respectively about 7%, 9% and 14%. Furthermore, Terfenol-D has shown a decrease in fracture load with a decrease in the loading rate, as other materials such as TiAl alloys (Cao et al, 2007) and piezoelectric ceramics (Shindo et al, 2009;Narita et al, 2012) have exhibited a similar behavior.…”