Microstructure and mechanical properties of high Nb containing TiAl alloys by reactive hot pressing

Wang, Y.H.; Lin, Junpin; He, Yuehui; Lu, Xin; Chen, G.L.

doi:10.1016/j.jallcom.2007.06.107

Cited by 35 publications

(11 citation statements)

References 14 publications

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“…High Nb-TiAl alloys have attracted increasing attention due to their good high temperature performance, and are considered as candidates for superalloys [1][2][3][4][5]. However, Nb is a b o (B2 structure) phase stabilizer, extending the b phase field to lower temperatures [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Phase transformation and decomposition mechanisms of the β (ω) phase in cast high Nb containing TiAl alloy

Song

You

et al. 2014

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Phase transformation and decomposition mechanisms of the β (ω) phase in cast high Nb containing TiAl alloy

Song

You

et al. 2014

Journal of Alloys and Compounds

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“…Many investigations have been carried out on the microstructure evolution as well as composition control of the alloys, which are important in optimizing their mechanical properties. However, the β o phase, which is induced by Nb segregation, is considered detrimental to the room temperature ductility [4,5]. Moreover, ω o phase always precipitates within the parent β o phase, which is difficult to be eliminated according to recent studies [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

ωo phase precipitation in annealed high Nb containing TiAl alloys

Song

Peng

et al. 2015

Progress in Natural Science: Materials International

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The ordered ω phases in high Nb containing TiAl (Nb-TiAl) alloys have been garnering increasing attention in the recent years. However, the investigations on the Nb dependence on the ω o precipitation are scarce. In this study, the effect of Nb content on the ω o precipitation in high Nb (6-10 at%) containing TiAl alloys after long-time annealing at 850 1C has been studied. The results show that small ordered ω particles in the retained β o phase cannot be discerned under scanning electron microscope (SEM) but can be observed using transmission electron microscopy (TEM). Although the Nb segregation can be eliminated after the homogenization heat treatment, the ω o phase precipitated in all the alloys studied after annealing at 850 1C. TEM examination reveals that the orientation relationship between the ω o and α 2 phases can be derived as: [0001]ω o // [1120]α 2 ; (1120)ω o //(0001)α 2 , which indicates that the ω o phase is directly transformed from the parent α 2 phase. Small γ particles are also observed within the ω o areas. The α 2 -ω o þγ decomposition process is expected during annealing. It is concluded that ω o phase is an equilibrium phase in high Nb-TiAl alloys at 850 1C.

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“…The finer size of the transition metal powders should, therefore, be favored as it will allow a faster rate of formation of the desired compound [20]. It is generally accepted that diffusion bonding plays a significant role in the consolidation of fine powders during sintering [21,22]. The growth of intermetallics is accelerated by the use of finer powders [23].…”

Section: Introductionmentioning

confidence: 99%