Phase relationships in the ternary system Ti-Au-Al at 775 K

Jorda, J. L.; Müller, J.; Braun, H. F.; Susz, C.

doi:10.1016/0022-5088(87)90446-2

Cited by 12 publications

(15 citation statements)

References 3 publications

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“…When vacuum heat treating a 20 mm Au coating deposited on 48-2-2 alloy, Au diffused and formed, from the surface to the bulk, TiAlAu 2 and TiAlAu phases in agreement with the work of Jorda [24] that showed that only these two ternary compounds exist. At the interface between the coating and the alloy a zone enriched in Au is present.…”

Section: Discussionsupporting

confidence: 74%

Influence of an oxidation protective coating upon hot corrosion and mechanical behaviour of Ti–48Al–2Cr–2Nb alloy

et al. 2011

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Section: Discussionsupporting

confidence: 74%

Influence of an oxidation protective coating upon hot corrosion and mechanical behaviour of Ti–48Al–2Cr–2Nb alloy

et al. 2011

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“…Accordingly, it is indicated that Au diffuses in Ti 3 Al by substituting mainly on Ti sites, as expected from the form of the Ti-Al-Au ternary phase diagram. [17] Atom migrations for substitutional impurity diffusion in intermetallic compounds are restricted for maintaining the ordered structure, and therefore, the diffusion mechanism is closely related to the preferential site occupancy in the ordered structure as well known for diffusion mechanisms in Ni 3 Al [13][14][15][16] and Ni-base intermetallic compounds with the L1 2 structure. [22] In Ti 3 Al, there is a large difference (approximately 100 kJ mol À1 ) between Q Ti and Q Al , as shown in Table II, and therefore, diffusivities of substitutional impurity atoms in Ti 3 Al are also thought to depend strongly on their site occupancies.…”

Section: Discussionmentioning

confidence: 99%

“…For instance, in Ni 3 Al with L1 2 -type ordered structure, the diffusion of Si, Ge, In, Ti, Nb, and V, which preferentially substitute for Al atoms, exhibits lower diffusivities and higher activation energies than diffusion of Cu and Co, which preferentially substitute for Ni atoms. [13][14][15][16] According to the Ti-Al-Au ternary phase diagram, [17] the solubility limit of Au in a 2 -Ti 3 Al is as large as 10 at. pct or more.…”

Section: Introductionmentioning

confidence: 99%

Diffusion of Au in the Intermetallic Compound Ti3Al

Koizumi

Tanaka

Minamino

2009

Metall Mater Trans A

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The Au diffusion in the Ti 3 Al compound was investigated at six compositions from 25 to 35 at. pct Al by using the diffusion couples (Ti-X at. pct Al/Ti-X at. pct Al-2 at. pct Au; X = 25,27, 29, 31, 32, and 35) at 1273 to 1423 K. The diffusion coefficients of Au in Ti 3 Al D Ti 3 Al Au are relatively close to those of Ti. The D Ti 3 Al Au s slightly increase with Al concentration within the same order of magnitude. The activation energies of Au diffusion, Q Ti 3 Al Au s; evaluated from the Arrhenius plots were relatively close to those of Ti diffusion, Q Ti 3 Al Ti s; rather than those of Al diffusion, Q Ti 3 Al Al s; therefore, it was suggested that Au atoms diffuse by the sublattice diffusion mechanism in which Au atoms substitute for Ti sites preferentially in Ti 3 Al and diffuse by vacancy mechanism on Ti sublattice. The influence of the D0 19 ordered structure (hcp base) of Ti 3 Al on diffusion of Au and other elements is discussed by comparing the diffusivities in Ti 3 Al and a-Ti.

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“…Up to now, the isothermal sections were investigated in the partial or whole concentration range only for the {Ti, Zr, Hf}-Ag-{Al, Ga} [1][2][3][4][5][6] and Ti-{Au, Pt, Pd}-Al [7,8] systems. In addition, the existence of a certain number of isostructural ternary compounds of the discussed systems was reported earlier [9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%