In situ tensile deformation and fracture behavior of Ti–24Al–14Nb–3V–0.5Mo alloy with various microstructures

Wu, Ying; Zhen, Liang; Yang, Danni; Kim, M.S.; Hwang, Sun Keun; Umakoshi, Yukichi

doi:10.1016/j.intermet.2003.07.007

Cited by 18 publications

(8 citation statements)

References 28 publications

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“…(2). TEM observation indicated that the microstructure in the as-rolled specimen consists of the primary equiaxed 2 -phase, a considerable amount of B2-phase matrix and fine O-phase formed within the primary 2 grain [14][15][16]. Thus, the observed microstructure in the asrolled specimen represented a typical recrystallized structure after thermo-mechanical treatments.…”

Section: Methodsmentioning

confidence: 88%

“…Most work on the oxidation behavior of Ti 3 Al-based alloys concerns the effect of the alloying elements Nb and Si on improvement of oxidation resistance by surface modification [6][7][8][9][10][11][12], however, the effect of microstructure on the oxidation behavior of 14at.%Nb-containing Ti 3 Al-based alloy is still lacking. The formation mechanism and microstructural development of the O-phase as well as the tensile deformation and fracture behavior of Ti 3 Al-Nb alloy have been previously studied by Wu et al [13][14][15][16]. The purpose of the present study, therefore, is to evaluate the isothermal oxidation behavior of Nb, V and Mocontaining Ti 3 Al-based alloy by focusing on the effect of microstructure on the oxidation resistance.…”

Section: Introductionmentioning

confidence: 92%

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The Isothermal Oxidation Behavior of a Ti3Al-Nb-V-Mo Alloy

Song¹

2010

TOCORRJ

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Abstract:The isothermal oxidation behavior of Ti-24Al-14Nb-3V-0.5Mo alloy in synthetic air from 700°C to 1000°C was studied. The main emphasis was focused on the effect of microstructure obtained by different processes of melting and hot rolling, i.e. large and duplex of 2 +B2, on the oxidation resistance. Regardless of the microstructure, the overall oxidation process of the specimens exposed at 700°C was dominantly controlled by the beneficial effect of Nb-addition due to the formation of a continuous -Al 2 O 3 layer in the scale. However, both specimens showed poor oxidation resistance above 900°C, especially for the as-rolled specimen, because of higher volume fraction of the 2 -phase. The spallation occurred in both specimens at 1000°C, which was probably relative to the formation of Ti 2 AlN between the thick scale and the substrate except for the TiO 2 and -Al 2 O 3 .

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Section: Methodsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 92%

The Isothermal Oxidation Behavior of a Ti3Al-Nb-V-Mo Alloy

Song¹

2010

TOCORRJ

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“…The corresponding tensile sample was brittle and broke at the welded seam without appreciable macroscopic deformation, and the fracture surface revealed an evident cleavage river pattern, see Fig. 6 The size and volume fracture of the α 2 particles were expected to be the } plane [16]. The lack of cross slip is expected to contribute to the nucleation of cracks at the α 2 /B2 boundaries.…”

Section: Rt Tensile Behaviormentioning

confidence: 99%

Effect of Isothermal Deformation Amount on Electron Beam Welded Joint of Ti60/Ti-22Al-25Nb

Zhang¹,

Guo²,

Li³

2015

Materials and Manufacturing Processes

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Ti60 and Ti-22Al-25Nb were joined by an electronic beam (EB) welding then forged by a microprocessor-controlled 630 ton hydraulic press at different deformation amounts (30%, 40%, and 50%). The effect of the deformation amount on the microstructure and properties of the welded joint of Ti60/Ti-22Al-25Nb during isothermal forging was investigated. The results revealed that the samples exhibited great strength, which was insensitive to the microstructure because of the high τ p . It was found that the elongation (A) and reduction of area (Z) were strongly dependent on microstructural features. Ductility was greatly improved by the 40% and 50% deformation. Furthermore, the 40% deformation sample exhibited the greatest combination of strength and ductility.

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“…10 and Table 2 [32,33]. In addition, the precipitated O phases tend to impede the slip of dislocation and dispersing the slip modes of the dislocations, which contributes to improvement of the mechanical properties of alloys [34]. Thus, the limited number of O phase in weld zone is considered to be responsible for the inferior tensile strength and elongation.…”

Section: Mechanical Propertiesmentioning

confidence: 99%