Hot Workability and Microstructure Evolution of TiAl Alloy in (α2+γ) Dual-phase Field

Zhihai, Deng; Li, Jinshan; Zhang, Tiebang; Hu, Rui; Zhong, Hong; Chang, Hui

doi:10.1016/s1875-5372(13)60085-5

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…Also, researchers have evaluated the workability of different Ti-based composites at various working conditions. [37][38][39][40] They found that the workability is disturbed by different deformation characteristics and the amount of stress during the deformation test is affected due to the materials flow softening. [37][38][39][40] Increasing the workability of P/M material is a crucial task in the forming process.…”

Section: Introduction and Literature Studymentioning

confidence: 99%

“…[37][38][39][40] They found that the workability is disturbed by different deformation characteristics and the amount of stress during the deformation test is affected due to the materials flow softening. [37][38][39][40] Increasing the workability of P/M material is a crucial task in the forming process. But, the need for workability improvement is more in industrial applications.…”

Section: Introduction and Literature Studymentioning

confidence: 99%

“…37–40 They found that the workability is disturbed by different deformation characteristics and the amount of stress during the deformation test is affected due to the materials flow softening. 37–40…”

Section: Introduction and Literature Studymentioning

confidence: 99%

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Role of localized heating on the workability of powder metallurgical Al–4% Ti components in cold compression

Tharmaraj

Davidson

Richard³

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present work, localised heating has been adopted at the damage site of the cold upset materials and the role of this mechanism on the workability has been analysed. Cylindrical specimens containing 96% aluminium and 4% titanium were prepared through powder metallurgy technique with an aspect ratio (height to diameter) of 1 by suitable pressures. A series of cold upsetting test was conducted and the material properties for various preforms initial relative densities (80%, 85% and 90%) were determined under the stable strain rate. The flow of metals was analysed using a finite element tool and it was observed that the metal flow starts from near the centre zone to the equatorial zone and the damage happens in the outer position because of more amount of accumulated stresses and the pores. These stresses and pores decrease the workability of the final component. Hence, the present research is intended to reduce the stresses and minimize the pores by applying a localized heating (100 °C–250 °C) at the equatorial sites of the components and thereby increasing the workability of the material. Also, heating selectively at the equatorial site of the workpiece improves the workability due to change in grain size and it was noticed that the grain size of the developed porous preforms was high for the higher heating conditions due to the growth of the grains. Therefore, the localized heating adopted in this work is a superior method to enhance the workability of the powder samples and this novel technique could be useful in improving the workability of the structural components that have extensive applications in the automobile and aerospace industries.

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Section: Introduction and Literature Studymentioning

confidence: 99%

Section: Introduction and Literature Studymentioning

confidence: 99%

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Role of localized heating on the workability of powder metallurgical Al–4% Ti components in cold compression

Tharmaraj

Davidson

Richard³

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Enhanced Hot Workability of Ti–46Al–4Nb–0.1B Alloy by Introducing Adjustable β Phase via Elemental Powder Metallurgy

et al. 2020

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TiAl‐base alloys are a kind of promising materials for high‐temperature applications. The β phase existing in TiAl alloy can improve the hot workability, but deteriorates the creep properties. Preparing a β phase‐containing TiAl‐base alloy to enhance the hot workability before hot deformation and eliminating the β/B2 phase by postheat treatment to improve the service performance is a good strategy. Herein, a significant volume fraction of β phase is obtained in the Ti–46Al–4Nb–0.1B alloy by the elemental powder metallurgy (EPM), and the β/B2 phase is eliminated by the subsequent heat treatment. The results demonstrate that the microstructure of the EPMed Ti–46Al–4Nb–0.1B alloy predominantly consists of α2/γ lamellar colonies, equiaxial γ grains, and some randomly distributed β phase and σ‐Nb2Al phase. The β/B2 phase formed at the Nb‐enriched regions is caused by insufficient diffusion. The EPMed Ti–46Al–4Nb–0.1B alloy has a relatively low thermal deformation activation energy (Q, 410 kJ mol−1), showed a well hot workability. The existence of the β phase is advantageous to harmonize the deformation of α2/γ lamellar grains and to improve the deformability of the TiAl alloy. The subsequent heat treatment can eliminate the Nb‐enriched regions and the B2 phase to ensure good service performance.

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The hot deformation behavior and processing map of Ti–47.5Al–Cr–V alloy

Jiang

Zhang

2015

Materials & Design

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Hot Workability and Microstructure Evolution of TiAl Alloy in (α2+γ) Dual-phase Field

Cited by 4 publications

References 14 publications

Role of localized heating on the workability of powder metallurgical Al–4% Ti components in cold compression

Role of localized heating on the workability of powder metallurgical Al–4% Ti components in cold compression

Enhanced Hot Workability of Ti–46Al–4Nb–0.1B Alloy by Introducing Adjustable β Phase via Elemental Powder Metallurgy

The hot deformation behavior and processing map of Ti–47.5Al–Cr–V alloy

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