A novel hot pack rolling of high Nb–TiAl sheet from cast ingot

Shen, Zhengzhang; Lin, Jianwei; Liang, Yongfeng; Zhang, L.Q.; Shang, Shun‐Li; Liu, Zhe

doi:10.1016/j.intermet.2015.07.009

Cited by 47 publications

(21 citation statements)

References 28 publications

(15 reference statements)

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“…These microstructures were adjusted solely by exploiting effects of phase transformations and chemical driving forces due to phase imbalances between different heat treatment steps. [207][208][209][210][211] The microstructure of a TNM sheet after multi-pass rolling within the (a þ b þ g) phase region, followed by stress relief annealing below T eu is shown in Figure 16g. A thorough description of the developed heat treatments and the obtained mechanical properties are given in ref.…”

Section: Manufacturing and Processing Of Advanced Titanium Aluminidesmentioning

confidence: 99%

Intermetallic β‐Solidifying γ‐TiAl Based Alloys − From Fundamental Research to Application

et al. 2017

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Intermetallic titanium aluminides based on the ordered g-TiAl phase have gained increasing interest as innovative high-temperature light-weight structural materials. They have found application in aerospace and automotive industries and are still subject of worldwide research and development activities. Their attractive properties perfectly match the engine manufacturers' demands. This review, bridges the gap from the development of the TNM alloy through structural characterization with sophisticated in and ex situ methods, engineering properties, manufacturing, and processing technologies to all aspects of application. Because one thing is clear, the material still has great potential.

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Section: Manufacturing and Processing Of Advanced Titanium Aluminidesmentioning

confidence: 99%

Intermetallic β‐Solidifying γ‐TiAl Based Alloys − From Fundamental Research to Application

et al. 2017

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“…DS experiments were performed under an argon atmosphere in a set of electromagnetic continuous casting (EMCC) experiment equipment with liquid metal cooling. The EMCC process details concerning the working procedure can be found in previous study by Shen et al [12] . The equipment for the EMCC process used in the present study is schematically shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and mechanical properties of Ni3Al intermetallics prepared by directional solidification electromagnetic cold crucible technique

et al. 2017

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[1][2][3] , Ni 3 Al-based alloys have long attracted considerable interest as a class of high-temperature structural material. These properties, combined with their unique high thermal conductivity, make them ideal for special applications, such as blades in gas turbines and jet engines. However, polycrystalline Ni 3 Al alloys show almost no ductility and extremely low fracture resistance at ambient temperatures, which is ascribed to the intrinsic brittleness of their grain boundaries [4] . It has been found that these grain boundaries are also susceptible to moisture. Thus, Ni 3 Al alloys easily suffer from environmental embrittlement [5] . Recently, Ni 3 Al alloys with high ductility at room temperature have been made by directional solidification (DS) without alloying. Binary single-phase Ni 3 Al alloys with columnar-grained structure, prepared by a floating zone method, showed about 60% tensile Abstract: The present work focused on the Ni 3 Al-based alloy with a high melting point. The aim of the research is to study the effect of withdrawal rate on the microstructures and mechanical properties of directionally solidified Ni-25Al alloy. Ni 3 Al intermetallics were prepared at different withdrawal rates by directional solidification (DS) in an electromagnetic cold crucible directional solidification furnace. The DS samples contain Ni 3 Al and NiAl phases. The primary dendritic spacing (λ) decreases with the increasing of withdrawal rate (V), and the volume fraction of NiAl phase increases as the withdrawal rate increases. Results of tensile tests show that ductility of DS samples is enhanced with a decrease in the withdrawal rate. elongation along the columnar grains direction at room temperature [6] . The ductility improvement of DS Ni 3 Al alloys have been interpreted by transgranular fracture mode, since low angle columnar-grained boundaries are more resistant to fracture [7] . During directional solidification, the solidification parameters affect the microstructures and mechanical behaviors of the alloys [8] . Therefore, the effects of solidification parameters on the microstructure and mechanical properties have been investigated widely for different alloys, such as Al-based alloys, TiAl-based alloys [9] , Fe-Ni alloys [10] , and CuSn alloys [11] . These studies mostly focused on eutectic alloys or peritectic alloys with low melting points. For binary alloys with high melting points, the effects of solidification parameters on the microstructures and mechanical properties have rarely been reported.Hence, the present work focused on the Ni 3 Albased alloy with a high melting point. The aim of the research is to study the effect of withdrawal rate on the microstructures and mechanical properties of directionally solidified Ni-25Al alloy, and the effect of NiAl phase on strength and ductility is discussed. The results provide a reference for the microstructure control of Ni 3 Al-based alloys by directional solidification.

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“…1 and details about the working procedure can be found in a previous study by Z. Z. Shen [2] . DOI: 10.1007/s41230-016-5107-2…”

Section: Methodsmentioning

confidence: 99%

“…However, poor ductility at room temperature as well as low workability at elevated temperatures of the high-Nb TiAl alloys restricts their applications [2] . According to current knowledge, high mechanical properties can be achieved in these materials by attaining a finer fully lamellar microstructure [3] .…”

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confidence: 99%

A high-Nb TiAl alloy with highly refined microstructure and excellent mechanical properties fabricated by electromagnetic continuous casting

et al. 2016

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Male, born in 1968, Ph.D, Professor. His main research fields include solidification and microstructure control, investment casting technology of titanium-aluminum alloys and directionally solidified titanium-aluminum alloys. [1] .Therefore, the development of such a material system has important implications for aeronautics and astronautics fields. However, poor ductility at room temperature as well as low workability at elevated temperatures of the high-Nb TiAl alloys restricts their applications [2] . According to current knowledge, high mechanical properties can be achieved in these materials by attaining a finer fully lamellar microstructure [3] . Electromagnetic continuous casting (EMCC) is a technique which is in virtue of electromagnetic force to strengthen the movement of the metallic melt and improve heat transfer during solidification. When the EMCC is applied to the melt during solidification, the Abstract: In the present research, microstructure refinement of a high-Nb TiAl alloy (Ti-48Al-8Nb-0.15B ) was realized by means of the electromagnetic continuous casting (EMCC) technique. The microstructure of an ingot obtained by EMCC was analyzed using scanning electron microscopy (SEM). As compared with the raw as-cast alloy, the obtained EMCC alloy presented a much finer microstructure with lamellar colonies with a mean size of about 50-70 μm because the electromagnetic stirring broke initial dendrites and enhanced the heterogeneous nucleation. As the grains were refined, the properties of the TiAl alloy were improved significantly. This implies that the EMCC technique could offer the possibility of application for high-Nb TiAl alloys with a refined microstructure and excellent properties to be used as a structural material. microstructure would be refined and the distribution of compositions also could be homogenized [4][5][6] . EMCC technique has been applied to the production of many alloys such as aluminum alloys [4] , magnesium alloys [5] and alloyed steels [6] , but application to TiAl alloys has rarely been reported. Based on the above opinions, the EMCC technique was used in refining a high-Nb TiAl alloy with the composition of Ti-48Al-8Nb-0.15B in the present study, and the microstructure and mechanical properties of EMCCed samples were investigated.

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A novel hot pack rolling of high Nb–TiAl sheet from cast ingot

Cited by 47 publications

References 28 publications

Intermetallic β‐Solidifying γ‐TiAl Based Alloys − From Fundamental Research to Application

Intermetallic β‐Solidifying γ‐TiAl Based Alloys − From Fundamental Research to Application

Microstructure and mechanical properties of Ni3Al intermetallics prepared by directional solidification electromagnetic cold crucible technique

A high-Nb TiAl alloy with highly refined microstructure and excellent mechanical properties fabricated by electromagnetic continuous casting

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