Microstructure and mechanical properties of Ti44Al6Nb alloys with different cerium contents

Fang, Hongyuan; Chen, Ruirun; Chen, Xiaoyu; Ma, Zhikun; Ding, Hongsheng; Guo, Jingjie

doi:10.1007/s12598-015-0611-5

Cited by 11 publications

(4 citation statements)

References 8 publications

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“…Figure 8f shows a comparison of the UCS as a function of CS for several γ‐TiAl‐based alloys via different processing techniques. [ 24–37 ] As can be seen from the graph, our results (UCS ≈ 2134 MPa and CS ≈ 28.7%) show a superior combination of strength and ductility, suggesting that the formation of high‐ordered nanotwins can be an effective way to fabricate high‐performance γ‐TiAl‐based alloys in the aerospace industry.…”

Section: Resultsmentioning

confidence: 74%

Peritectic Solidification Kinetics and Mechanical Property Enhancement in a Rapidly Solidified Ti–48 at% Al–8 at% Nb Alloy via Hierarchical Twin Microstructure

Liang

Wang

2021

Adv Eng Mater

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The strength and ductility trade‐off dilemma has limited the wide application of TiAl‐based alloys. Here, a new insight into the potential for increasing the strength and ductility of a hypoperitectic Ti–48 at% Al–8 at% Nb alloy is accomplished by the electromagnetic levitation (EML) technique. Moreover, a systematic analysis of the primary and subsequent peritectic solidification kinetics is conducted in the undercooling range of 308 K. Assisted by a high‐speed camera, in situ observation of the liquid–solid (primary β‐Ti phase and peritectic α‐Ti phase) interface migration is accomplished. When the alloy melt is undercooled to 240 K, high‐ordered nanotwins are observed in the Ti–48 at% Al–8 at% Nb alloy, which form a unique hierarchical microstructure. Upon further increasing the undercooling, the density of these nanotwins is significantly enhanced. The room‐temperature compression results reveal that the strength and ductility increase up to 140% and 150%, respectively. This is mainly ascribed to the remarkable grain refinement, formation of nanotwins with various orientations, accumulation of dislocations and stacking faults, and retention of the metastable γ‐phase. The superior combination of strength and ductility indicates the possibility to fabricate high‐ordered nanotwins via rapid solidification, thus improving the performance of γ‐TiAl‐based alloys.

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Section: Resultsmentioning

confidence: 74%

Peritectic Solidification Kinetics and Mechanical Property Enhancement in a Rapidly Solidified Ti–48 at% Al–8 at% Nb Alloy via Hierarchical Twin Microstructure

Liang

Wang

2021

Adv Eng Mater

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“…TiAl alloy has the advantages of high specific stiffness, good high temperature creep and high temperature fatigue performance [1][2][3][4]. But its oxidation resistance decreases rapidly above 900 °C, which will not meet the performance requirements of practical applications and seriously restricts its wide application [5].…”

Section: Introductionmentioning

confidence: 99%

Oxidation properties of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy at 950–1050 °C

Lin

Huang

Yuan

et al. 2023

Materials Science and Technology

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Oxidation experiments of a Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy were carried out at 950, 1000 and 1050 °C. The alloy's oxidation kinetics curve, oxidation products, oxide film structure and oxidation mechanism at different oxidation temperatures and times were studied systematically. The oxide film has an obvious multilayer structure. Oxygen diffuses into the matrix alloy, and two oxides (TiO2 and Al2O3) grow alternately in layers to produce multilayer structures. As the oxidation process continues, oxygen atoms continue to diffuse in the matrix, there are holes and cracks in the oxide film, and the oxidation resistance of the oxide film is weakened.

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“…TiAl alloy is a type of light-weight and hightemperature structural material with great potential for application [1][2][3]. Since the mechanical properties of TiAl alloy are sensitive to the microstructure, and the heat treatment system does not play a decisive role in the microstructure, thermal deformation (such as rolling, extrusion and forging) of the alloy is often required [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Study on microstructure evolution and deformation softening mechanism of a Ti–47.5Al–2.5V–1.0Cr–0.2Zr alloy

Lin

Huang

Yuan

et al. 2022

Materials Science and Technology

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The hot compression tests of Ti–47.5Al–2.5V–1.0Cr–0.2Zr alloy were achieved by a Gleeble thermal simulator. The results show that the residual lamellar microstructure has sufficient energy and sufficient time to decompose, which is conducive to the evolution of the dynamic recrystallisation (DRX) microstructure. The dislocation density decreases significantly owing to the generation of a DRX. The deformation mechanism during hot deformation is dominated by the DRX of the γ-phase. Meantime, the increment of dislocations will induce to the generation of sub-grain boundaries. In addition to the mechanism of dislocation-induced recrystallised grain formation, twinning deformation is also a typical deformation mechanism in TiAl alloy. The transformation of lamellar microstructure into uniform and fine DRX microstructure can improve the microstructural uniformity of the alloy.

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Microstructure and mechanical properties of Ti44Al6Nb alloys with different cerium contents

Cited by 11 publications

References 8 publications

Peritectic Solidification Kinetics and Mechanical Property Enhancement in a Rapidly Solidified Ti–48 at% Al–8 at% Nb Alloy via Hierarchical Twin Microstructure

Peritectic Solidification Kinetics and Mechanical Property Enhancement in a Rapidly Solidified Ti–48 at% Al–8 at% Nb Alloy via Hierarchical Twin Microstructure

Oxidation properties of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy at 950–1050 °C

Study on microstructure evolution and deformation softening mechanism of a Ti–47.5Al–2.5V–1.0Cr–0.2Zr alloy

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