Microstructure and fracture behaviour of Ti-44A1-xM derivatives

Li, Y.G.; Loretto, M. H.

doi:10.1016/0956-7151(94)90388-3

Cited by 42 publications

(10 citation statements)

References 8 publications

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“…was found to have a similar effect to Cr; [22,23] and Mo and W Moreover, the effects of Fe, Cr, Mn, V, Nb, Mo, and W were more effective than Cr to stabilize B2 phase. [26,27,34,35] on the properties of TiAl are different. Because Cr decreases Therefore, an empirical equation of [Cr] is suggested as the Ti 3p and Al 3p binding energies in Ti-Ti, Ti-Al, and follows:…”

Section: Alloysmentioning

confidence: 97%

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Alloying mechanism of beta stabilizers in a TiAl alloy

Sun

Chun-xiao

Yan

et al. 2001

Metall Mater Trans A

155

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The effects of beta stabilizers such as Fe, Cr, V, and Nb on the microstructures and phase constituents of Ti 52 Al 48 -xM (x ϭ 0, 1.0, 2.0, 4.0, or 6.0 at. pct and M ϭ Fe, Cr, V, and Nb) alloys were studied. The dependence of the tensile properties and creep resistance of TiAl on the alloying elements, especially the formation of B2 phase, was investigated. Fe is the strongest B2 stabilizer, Cr is second, V is an intermediate stabilizer, and Nb is the weakest stabilizer. The composition partitioning of Fe, Cr, V, and Nb in the ␥ phase is affected by the formation of B2 phase. The peaks of the tensile strengths and creep rupture life of Ti 52 Al 48 -xM generally occur at the maximum solid solution of these elements in the ␥ phase, which is just before the formation of B2 phase. Ti 52 Al 48 -0.5Fe shows an attractive elongation of 2.5 pct at room temperature, and the Ti 52 Al 48 -1V, Ti 52 Al 48 -Cr, and Ti 52 Al 48 -2Nb alloys have about 1.1 to 1.3 pct elongation at room temperature. The increase of tensile strengths and creep resistance with increasing Fe, Cr, V, and Nb contents is chiefly attributed to the solidsolution strengthening of these elements in the ␥ phase. The appearance of B2 phase deteriorates the creep resistance, room-temperature strengths, and ductility. With respect to the maximum solidsolution strengthening, an empirical equation of the Cr equivalent [Cr] is suggested as follows: [Cr] ϭ Cr ϩ Mn ϩ 3/5V ϩ 3/8Nb ϩ 3/2 (W ϩ Mo) ϩ 3Fe ϭ 1.5 to 3.0. The solid-solution strengthening mechanism of Fe, Cr, V, and Nb at room temperature arises from the increase of the Ti 3s and Al 2s binding energies in Ti-Ti and Al-Al bonds, and the retention of the strength and creep resistance at elevated temperatures in Ti 52 Al 48 -xM is mainly attributed to the increase of the Ti 3s and Al 2s binding energies in Ti-Al bonds in ␥ phase. The decrease of the Ti 3p and Al 2p binding energies in Ti-Ti, Ti-Al, and Al-Al bonds benefits the ductility of TiAl.

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Section: Alloysmentioning

confidence: 97%

“…[20] In With respect to optimization of the mechanical properties other studies, B2 phase was introduced into TiAl to improve of TiAl, alloying and microstructure control must be considthe mechanical properties; [26][27][28][29] for example, 2.0 at. pct Mo ered.…”

Section: Introductionmentioning

confidence: 99%

Alloying mechanism of beta stabilizers in a TiAl alloy

Sun

Chun-xiao

Yan

et al. 2001

Metall Mater Trans A

155

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“…The former effect may be attributed to the more uniform plastic deformation in the Cr-modified lamellar microstructure, while the latter could be caused by the thickening of the γ lamellae. In another study, B2 phase was introduced to the TiAl alloy by adding 2 at.% Mo to Ti-44Al-2Mo (at.%), hence improving room-temperature tensile ductility and strength [11]. However, according to the study carried out by Sun, et al [11], presence of B2 phase in TiAl alloys does not improve strength and ductility at room temperature, but decreases them [12].…”

Section: Introductionmentioning

confidence: 99%

“…In another study, B2 phase was introduced to the TiAl alloy by adding 2 at.% Mo to Ti-44Al-2Mo (at.%), hence improving room-temperature tensile ductility and strength [11]. However, according to the study carried out by Sun, et al [11], presence of B2 phase in TiAl alloys does not improve strength and ductility at room temperature, but decreases them [12]. Moreover, the appearance of B2 phase also deteriorates creep resistance and high-temperature strength.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Cr and Mo on the Microstructure and Mechanical Properties of As-Cast TiAl Alloys

2013

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Abstract. The effect of the microstructure and mechanical properties locally made arc-melting to identify the phases present in the samples. The micr samples was characterized using scanning electron microscop energy dispersive spectroscopy (EDS). Compression tests were carried out at room temperature using show that the Ti-48Al alloy exhibited addition of Cr a nearly lamellar microstructure was observed in Ti with the addition of both Cr and Mo values increased slightly the alloying elements. The presence of Cr in Ti increase in compressive fracture strain. produced a higher yield strength and fracture str to the other as-cast TiAl alloys. alloys, mixed brittle transgranular and interlamellar fracture modes were predominantly observed.

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“…V, Cr and Mn were reported to improve the ductility of two-phase TiAl alloys at room temperature [4][5][6] . Moreover, the additions of Nb and Mo enhance the tensile strengths at room and elevated temperature [7,8] , and these elements are classified as solid solution strengthening elements. W was found to improve the creep properties significantly [9][10][11][12] .…”

mentioning

confidence: 99%

First-principles investigation of the alloying effect of Ta and W on γ-TiAl

Dang

Wang

2006

CHINESE SCI BULL

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The alloying effect of the refractory elements Ta and W on the electronic structure of γ -TiAl is investigated by using the first-principles discrete variational method within the framework of density functional theory. The impurity formation energy result indicates that Ta and W can stay steadily in the TiAl system by way of substitution. The Mulliken population, density of states and charge density difference results show that Ta and W both give rise to the strong interaction between themselves and the neighboring host atoms. The alloying effect of the two elements on γ -TiAl is the same.

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Microstructure and fracture behaviour of Ti-44A1-xM derivatives

Cited by 42 publications

References 8 publications

Alloying mechanism of beta stabilizers in a TiAl alloy

Alloying mechanism of beta stabilizers in a TiAl alloy

The Effects of Cr and Mo on the Microstructure and Mechanical Properties of As-Cast TiAl Alloys

First-principles investigation of the alloying effect of Ta and W on γ-TiAl

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