Lamellar Microstructure Alignment in Ti-47Al Alloy by Electromagnetic Confinement and Directional Solidification Using a Seed

Du, Yajie; Shen, Jun; Xiong, Yi; Ren, Chunhe; Fu, Hengzhi

doi:10.1007/s11837-015-1438-0

Cited by 9 publications

(3 citation statements)

References 25 publications

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“…In recent years, novel research on traditional α seeds has included Du et al [ 30 , 31 , 32 ] using Ti-43Al-3Si seed to prepare large-size Ti-47Al samples. They fixed the master alloy rod on the feeding mechanism and the seed rod with the same diameter on the pulling mechanism melted the upper part of the seed crystal and the lower part of the master alloy by electromagnetic induction heating, and then the metal formed a 10~20 mm long melting zone under the electromagnetic restraint.…”

Section: Seed Crystal Methods and Principlesmentioning

confidence: 99%

Review on Progress of Lamellar Orientation Control in Directionally Solidified TiAl Alloys

et al. 2023

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TiAl alloys have excellent high-temperature performance and are potentially used in the aerospace industry. By controlling the lamellar orientation through directional solidification (DS) technology, the plasticity and strength of TiAl alloy at room temperature and high temperatures can be effectively improved. However, various difficulties lie in ensuring the lamellar orientation is parallel to the growth direction. This paper reviews two fundamental thoughts for lamellar orientation control: using seed crystals and controlling the solidification path. Multiple specific methods and their progress are introduced, including α seed crystal method, the self-seeding method, the double DS self-seeding method, the quasi-seeding method, the pure metal seeding method, and controlling solidification parameters. The advantages and disadvantages of different methods are analyzed. This paper also introduces novel ways of controlling the lamellar orientation and discusses future development.

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Section: Seed Crystal Methods and Principlesmentioning

confidence: 99%

Review on Progress of Lamellar Orientation Control in Directionally Solidified TiAl Alloys

et al. 2023

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“…The lamellar structures with orientation parallel to the growth direction can be obtained using the directional solidification technology [8,[12][13][14][15][16]. At present, the influence of lamellar orientation on the mechanical properties of TiAl alloys is mainly the results of R. Chen [15][16][17][18][19][20][21], J. Shen [13,[22][23][24]] and Yamaguchi's research group [25][26][27]. Moreover, G. Chen et al [13] have reported that the DS Ti-45Al-8Nb (at.-%) alloy with aligned lamellar structures, which was prepared in an optical floating zone furnace, showed an average ductility of 6.9% and ultimate tensile strength (UTS) of 978 MPa at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of lamellae orientation on tensile properties of directionally solidified Ti–46Al–0.5W–0.5Si alloy

Fan

Liang

Liu

et al. 2021

Materials Science and Technology

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For full-lamellar TiAl alloys, mechanical properties can be improved in a wide range of temperature by controlling lamellar orientation parallel to growth direction. However, lamellar controlled TiAl alloys with good properties and large scale are difficult to obtain due to sever interface reaction between TiAl melts and mould materials. In this paper, effect of lamellar orientation on tensile properties of directionally solidified (DS) Ti-46Al-0.5W-0.5Si alloy using oxide ceramics crucible was investigated. DS alloys with parallel lamellar structure had better tensile strength (479MPa) and elongation (0.76%) than that of specimen with equiaxed grains (428MPa, 0.22%). Fracture modes of DS alloys were interlamellar, translamellar mode and both, which depended on the lamellae orientation.

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“…Nevertheless, the casting process provides a method with advantages for the manufacture of TiAl alloys when compared to forging and rolling7. Various techniques have been applied to investigate the solidification behaviours of TiAl alloys, such as the optical floating zone method89, Bridgman method1011121314, water-cooled copper crucible method1516171819, and electromagnetic confinement method202122. Because of the well-known high reactivity of the melt, the selection of the mould material for casting of TiAl alloys is important.…”

mentioning

confidence: 99%

Microstructure formation and interface characteristics of directionally solidified TiAl-Si alloys in alumina crucibles with a new Y2O3 skull-aided technology

Fan

Liu

et al. 2017

Sci Rep

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The microstructure evolution and interface characteristics of a directionally solidified Ti-43Al-3Si (at.%) alloy in an alumina (Al2O3) crucible with new Y2O3 skull-aided technology were investigated. The Y2O3-skull that is in contact with the TiAl-melt is relatively stable, which results in a more controlled reaction between the skull and the melt than in the case of an Al2O3 crucible is used. A thin reaction layer was formed between the mould and the melt through mutual diffusion. The layer thickness increased with increasing reaction time. The thickness of this layer was less than 80 μm for reaction times up to 5800 s. Y2O3 particles were not found in the specimen because the mould coating was prepared with fine Y2O3 powder without a binder, which prevented the Y2O3 particles splitting from the coating as a consequence of thermal physical erosion. The oxygen content of the TiAl-alloy increased with increasing reaction time. The total oxygen content of the solidified specimen was less than that of the specimen solidified in the Al2O3 crucibles. This new Y2O3 skull-aided technology is expected to improve the surface quality of TiAl-alloys and reduce the reaction between the crucible/mould and molten TiAl alloys during directional solidification processing with longer contact times.

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Lamellar Microstructure Alignment in Ti-47Al Alloy by Electromagnetic Confinement and Directional Solidification Using a Seed

Cited by 9 publications

References 25 publications

Review on Progress of Lamellar Orientation Control in Directionally Solidified TiAl Alloys

Review on Progress of Lamellar Orientation Control in Directionally Solidified TiAl Alloys

Effect of lamellae orientation on tensile properties of directionally solidified Ti–46Al–0.5W–0.5Si alloy

Microstructure formation and interface characteristics of directionally solidified TiAl-Si alloys in alumina crucibles with a new Y2O3 skull-aided technology

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