Effects of Third Elements on the Structures of TiAl-based Alloys

Hashimoto, Keizo; Doi, Haruo; Kondo, Kazuo; Tsujimoto, Tokuzou; Suzuki, Tomoo

doi:10.2320/jinstmet1952.52.8_816

Cited by 73 publications

(10 citation statements)

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“…Only one tie-line close to the Ti-Al binary system was established at 1000°C, which fits very well with the binary. [27] The composition 50 ± 2 at.% Ti, 25 at.% Zr, 25 ± 2 at.% Al was found to be single-phase D0 19 , the structure of Ti 3 Al, after annealing at 1000°C for 720 h. [51] Whether this means that Ti 3 Al may have a larger solid solubility for Zr than * 20 at.%, as found in (Ref 24) or whether D0 19 forms on cooling at around 1000°C from B2, as discussed before, cannot be settled based on the existing experimental evidence.…”

Section: Phasesmentioning

confidence: 93%

“…[11][12][13][14][15][16][17] With the industrialisation of c TiAl based alloys, phase equilibria among the Ti-Al based phases in this system came into focus. [18][19][20][21][22][23] While all these activities were limited to specific parts of the system, studies of full isothermal sections have been performed only very recently. [24,25] Though of some practical importance, experimental difficulties in investigating Ti-Al(-X) systems at high temperatures make the determination of phase equilibria difficult.…”

Section: Introductionmentioning

confidence: 99%

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Critical Assessment of the Al-Ti-Zr System

Kahrobaee

Palm

2020

J. Phase Equilib. Diffus.

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Only within the last couple of years, complete isothermal sections for the Al-Ti-Zr system have been determined. Up to then there had been several investigations, but these were limited to the Ti-Zr and Ti-Al sides and the Ti- and Al corners of the system. Also recently the system has been evaluated by thermodynamic ab initio calculations and CALPHAD-type (CALculation of PHAse Diagrams) modelling. As Al-Ti-Zr alloys are of interest for a variety of applications and as the last assessment has been performed more than 15 years ago, this new critical evaluation of the existing literature about phase equilibria in the Al-Ti-Zr system has been performed.

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Section: Phasesmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Critical Assessment of the Al-Ti-Zr System

Kahrobaee

Palm

2020

J. Phase Equilib. Diffus.

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“…The addition of elements has been used to improve the mechanical performance of alloy materials for a long time [8][9][10][11]. Recently Hashimoto [12] found that the addition of Zr increases the hightemperature endurance and superior corrosion resistance for the Ti-Al base alloys. Furthermore, the addition of Zr also improves ductility and toughness, and thus enhances the processability of Ti−Al base alloys at room temperature [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Ab initio and CALPHAD-type thermodynamic investigation of the Ti-Al-Zr system

Deng

Zhao

Huang

et al. 2019

J min metall B Metall

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Ti-Al based alloys have been widely used in the aeronautics and aerospace. Adding alloying element Zr can significantly improve their high-temperature endurance and corrosion resistance. To investigate the influence of the addition of element Zr on the properties of the Ti-Al system, ab initio calculations and the CALPHAD (CALculation of PHAse Diagrams) method were used to evaluate the Ti-Al-Zr ternary system. Ab initio calculations were carried out to calculate the formation enthalpies of intermetallic compounds and end-members. CALPHAD approach was employed to optimize the thermodynamic parameters based on experiments. The experimental data of phase equilibria at 1073, 1273, 1473, and 1573 K, as well as a vertical section of the Ti 3 Al-Ti + 5 wt.% Zr were used to assess this system. The thermodynamic parameters of the binary Ti-Al, Al-Zr and Ti-Zr systems were acquired from recent assessments, and the ternary ones were evaluated in the present work. The Ti-Al-Zr ternary dataset has been established and the calculated results are in close agreement with the experimental data on both thermodynamics and phase equilibria.

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“…At the higher temperature, the equilibrium between the bTi, gTiAl and the Laves phase C14 containing a considerable amount of Al was found. The appearance of the Laves phase C14 in his work contradicted the work reported by Hashimoto et al [28], who suggested the presence of a ternary compound with the formula Ti 3 Mn 2 Al 3 .…”

Section: The Experimental Data Of Tiealemn At Ti-rich Cornermentioning

confidence: 64%