Thermodynamic modeling of the Nb–Si–Ti ternary system

Liang, Hao; Chang, Y. A.

doi:10.1016/s0966-9795(98)00073-9

Cited by 69 publications

(43 citation statements)

References 25 publications

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“…The Nb-Ti-Si system has been thermodynamically modeled by Liang and Chang [13] Recently, Yang et al remodeled this system by considering newly reported experimental data. [14,15] Figure 2 shows the calculated liquidus projection of the Nb-Ti-Si system by Yang.…”

Section: Nb-ti-simentioning

confidence: 99%

Liquid-Solid Phase Equilibria in Metal-Rich Nb-Ti-Hf-Si Alloys

Yang

Bewlay

Chang

2007

J Phs Eqil and Diff

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A thermodynamic description of the Nb-Ti-Hf-Si system is extrapolated from descriptions of the constituent Nb-Ti-Si, Nb-Hf-Si, Hf-Ti-Si, and Nb-Hf-Ti systems using the CALPHAD technique. From this thermodynamic description, the liquidus projection at the metal-rich region of the NbTi-Hf-Si system with the Si concentration up to 40% is calculated. The calculated liquidus surface at this region consists of six primary solidification regions: (Nb), Hf 2 Si, (Hf,Ti) 5 Si 3 , (Nb,Ti) 3 Si, aNb 5 Si 3 , and bNb 5 Si 3 . Three five-phase equilibria involving these phases are identified on the liquidus surface by this calculation. They are L þ (Nb) þ aNb 5 Si 3 ! Hf 2 Si þ (Nb,Ti) 3 Si at 1814 C, L þ Hf 2 Si þ aNb 5 Si 3 ! ðHf,Ti) 5 Si 3 þ ðNb,TiÞ 3 Si at 1739 C, L þ Hf 2 Si ! ðNb) þ (Hf,Ti) 5 Si 3 þ (Nb,Ti) 3 Si at 1400 C. To validate the calculated liquidus surface, a total of 10 alloys was directionally solidified. The microstructure of these 10 as-cast alloys was examined by using scanning electron microscopy (back scatter electron (BSE) imaging) and energy dispersive spectrometry (EDS). The solidification simulation of these 10 alloys was then performed by using the Scheil model that is integrated in the multicomponent phase diagram calculation software Pandat. The observed phases presented in the as-cast microstructure of these 10 alloys are in good agreement with those predicted from the Scheil simulation.

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Section: Nb-ti-simentioning

confidence: 99%

Liquid-Solid Phase Equilibria in Metal-Rich Nb-Ti-Hf-Si Alloys

Yang

Bewlay

Chang

2007

J Phs Eqil and Diff

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“…After heat treatment at 1300°C -1500°C for 100 h under Ar, Nb 3 Si was observed in the microstructure adjacent to Nb 5 Si 3 , where previously a eutectic microstructure had been seen. Pure Nb 3 Si is not stable at 1300°C -1500°C, however titanium substitution will stabilise the phase to lower temperatures [32] and allow growth of this phase as the eutectic coarsens during heat treatment.…”

Section: Liquidus Projectionmentioning

confidence: 99%

Experimental and thermodynamic assessment of the Ge-Nb-Si ternary phase diagram

Utton

Papadimitriou

Kinoshita

et al. 2017

Journal of Alloys and Compounds

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“…Ternary Nb-Ti-Si phase equilibria have been reported for the metal-rich end of the phase diagram (Bewlay et al, 1997b(Bewlay et al, , 1999aLiang and Chang, 1999), including liquid-solid and solid-solid phase equilibria. A space diagram of the metal-rich region (up to 37.5% Si) of the Nb-Ti-Si phase diagram is shown in Figure 7(a) (Bewlay et al, 1997b), and a projection of the liquidus surface is shown in Figure 7(b).…”

Section: Nb-ti-si Phase Stabilitymentioning

confidence: 99%