In situ identification of the silicide phase in super-α titanium alloys

Kotval, P. S.; Calder, Roy

doi:10.1007/bf02642467

Cited by 54 publications

(4 citation statements)

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“…The study carried out by Chen [22] indicated that Zr has high solubility in TiAl alloy and it is able to dissolve around 11 at% in g phase, and more than 25 at% in a 2 phase [23,24]. Meanwhile, the study carried out by Kotval [25] and Cheng [23] indicated that Al ions can dissolve in Ti 5 Si 3 as Ti 5 (Al, Si) 3 phase. Hence the possible composition of phase C shown is a (Ti, Zr) 5 (Si, Al) 3 phase.…”

Section: The Interaction Between Tial and The Shell Mouldsmentioning

confidence: 96%

“…During flash re-melting, molten TiAl interacted with (Zr, Ca)O 2 and CaAl x O y which formed a solidsolution with Si penetrating through from the backup coats [26]. Zr ions from the facecoat and Si from backup coats penetrated into the metal and reacted with TiAl to form a Ti 5 Si 3 with a Zr solid solute [24,25]. The reaction between Ti and Si is presented in equation (2):…”

Section: The Interaction Between the Facecoat And Tial Alloymentioning

confidence: 99%

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Investigation into the use of CaZrO3 as a facecoat material in the investment casting of TiAl alloys

Yuan

Cheng

Withey

2015

Materials Chemistry and Physics

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h i g h l i g h t sTo determine the interactions between CaZrO 3 filler and stucco materials during shell firing.To study the reaction between the CaZrO 3 facecoat and TiAl alloy during casting. The Al 2 O 3 stucco can react with CaZrO 3 filler to form (Zr, Ca)O 2 and CaAl x O y at 1650 C. O, Zr and Si ions from the ceramic moulds were observed to penetrate into the TiAl metal. The reaction products include (Ti, Zr) 5 (Al, Si) 3 and ZrAl 2 phase with high Ti ions solid solution. a b s t r a c tResearch was carried out to determine the interactions between the filler and stucco materials in CaZrO 3 based facecoats during shell firing as well as between the facecoat and a TiAl alloy during the casting process. A 'flash re-melting' technique, which gives a similar heating profile to the actual investment casting process, was used to study the phase transformations in the shell moulds. The chemical inertness of the facecoat was then investigated using a sessile drop test using a Tie45Ale2Nbe2Mne0.2TiB alloy. In this study, the facecoat compositions and the interaction products between metal and shells were characterized using x-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A severe interaction was found between CaZrO 3 filler and Al 2 O 3 stucco, which rapidly damaged the shell surface. As well as oxygen, zirconium and silicon ions from the shell moulds were also observed to penetrate into the TiAl metal to form (Ti, Zr) 5 (Al, Si) 3 phases in the metal/shell interfacial areas.

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Section: The Interaction Between Tial and The Shell Mouldsmentioning

confidence: 96%

Section: The Interaction Between the Facecoat And Tial Alloymentioning

confidence: 99%

Investigation into the use of CaZrO3 as a facecoat material in the investment casting of TiAl alloys

Yuan

Cheng

Withey

2015

Materials Chemistry and Physics

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“…The equilibrium phase diagrams of the Ti-Si system [11][12][13][14][15][16] report about six stable titanium silicides, Ti 3 Si (P4 2 /n 86), Ti 5 Si 3 (P6 3 /mcm 193), Ti 5 Si 4 (P4 1 2 1 2 92), TiSi (Pnma 62), TiSi 2 (Fddd 70), and TiSi 2 (Cmcm 63), that were observed in experimental works [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. However, there are several reasons to suppose that not all possible structures of titanium silicides are covered by existing equilibrium phase diagrams of the Ti-Si system.…”

Section: Introductionmentioning

confidence: 99%

“…Firstly, in the experimental investigations, only limited concentration and temperature ranges of phase equilibria were considered. For example, in the works devoted to investigations of silicide precipitation in titanium alloys, the studied concentration ranges were limited to a few atomic percent [17,18,23,28,31,33,34,[36][37][38][39][40][41][42][43][44][45][46][47][48]. In the works, devoted to determining phase equilibria and construction of phase diagrams [28,39,[48][49][50][51][52][53], the temperature ranges were limited by temperatures sufficiently high (above 600 K) for complete equilibration.…”

Section: Introductionmentioning

confidence: 99%

Evolutionary search for new compounds in the Ti–Si system

Poletaev

Aksyonov

Липницкий

2020

Calphad

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In this work, the results of the evolutionary variable-composition search for binary compounds in the Ti-Si system are presented. The evolutionary algorithm did not find any new stable structures of silicides at 0 K and 0 GPa. On the other hand, many low-energy metastable and unstable structures are predicted. The 33 predicted and 10 known from literature but previously unstudied structures of compounds with low formation energies with respect to the ground-state line are analyzed. The mechanical properties, electronic band structures, densities of states, and temperature dependencies of thermodynamic stability of 17 dynamically stable previously unstudied structures are calculated.

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High-Temperature Materials

Meetham

2001

Ullmann's Encyclopedia of Industrial Chemistry

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In situ identification of the silicide phase in super-α titanium alloys

Cited by 54 publications

References 1 publication

Investigation into the use of CaZrO3 as a facecoat material in the investment casting of TiAl alloys

Investigation into the use of CaZrO3 as a facecoat material in the investment casting of TiAl alloys

Evolutionary search for new compounds in the Ti–Si system

High-Temperature Materials

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