Effect of growth rate on microstructure and tensile properties of Ti–45Al–2Cr–2Nb prepared by electromagnetic cold crucible directional solidification

Ding, Hongsheng; Wang, Yongzhe; Chen, Ruirun; Guo, Jingjie; Fu, Hengzhi

doi:10.1016/j.matdes.2015.07.122

Cited by 39 publications

(3 citation statements)

References 40 publications

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“…As shown in Figs. 6(e) and (f ), the typical microstructure of the DS region consists of ¡ 2 /£ lamellae, B2 phase and blocky £ phase, 15) and Y 2 O 3 particles, which are generated by the reaction between the Y 2 O 3 mould and the melt, as described in previous reports. 16,17) As described in Refer, 18,19) the samples prepared by two kinds process under same solidification parameters have essentially same alignment of lamellae.…”

Section: Temperature Characteristicsmentioning

confidence: 75%

“…The interfacial temperature may be related to the thermalfield distribution within the Y 2 O 3 mould, which is owed to its porous structure. As indicated by Cui et al, 15) the reaction time is determined by the heating and solidification (depending on the temperature gradient) processes. To clearly characterize the difference between the interactions that occur using the graphite and EMCC heating modes, investigations on the temperature distributions inside the Y 2 O 3 moulds, as well as on the heating process and temperature gradient, were performed.…”

Section: Temperature Characteristicsmentioning

confidence: 99%

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A Novel Directional Solidification of TiAl-Based Alloys by Electromagnetic Cold Crucible Zone Melting Technology with Y2O3 Moulds

et al. 2018

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In order to decrease mould contamination, a novel directional solidification process was developed for TiAl-based alloys, where an Y 2 O 3 mould was incorporated into electromagnetic cold crucible (EMCC) zone melting technology. To determine the characteristics of this process, the macro/microstructures and mechanical properties of directionally solidified (DS) Ti45Al2Cr2Nb ingots prepared by two kinds of directional solidification techniques, namely traditional graphite heating (control group) and EMCC heating, were extensively investigated using electromagnetic field and temperature field. Compared with the control group, this new technique can induce bigger electromagnetic force in the tangential direction, generate a more rapid heating and higher temperature gradient, and decrease the interaction between the mould and melt; however the heat transfer is altered to inclining outward owe to the lateral heat transfer. The DS sample prepared by this method can achieve finer columnar crystals growing toward the axis, ¡ 2 /£ lamellae, and lower levels of contamination with regard to Y 2 O 3 particles and oxygen. These are beneficial to improve room temperature fracture toughness and tensile properties.

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Section: Temperature Characteristicsmentioning

confidence: 75%

Section: Temperature Characteristicsmentioning

confidence: 99%

A Novel Directional Solidification of TiAl-Based Alloys by Electromagnetic Cold Crucible Zone Melting Technology with Y2O3 Moulds

et al. 2018

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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.…”

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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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Effects of Nb on Microstructure and Mechanical Properties of Ti42Al2.6C Alloys

et al. 2018

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Ti42Al2.6C-xNb (x ¼ 0, 2, 4, 6, and 8 at%, similarly hereinafter) alloys are synthesized by melting to investigate the effects of Nb on microstructure and mechanical properties, especially the formation of B2 phase and high temperature tensile properties. The results show that lamellar colony size decreases from 33.3 to 13.2 mm and lamellar space decreases from 193.4 to 139.6 nm with increasing Nb from 0 to 8%. Lattice parameters of γ and α 2 phase change and B2 phase forms among lamellar colonies with the addition of Nb. The volume fraction of B2 phases and content of Nb in Ti 2 AlC phases increase with increasing Nb. B2 phases form between lamellar colonies because of Nb segregation. As high-melting-point element, Nb increases heterogenous nucleation particles and impedes grain growing. Compressive strength increases from 1568 to 1912 MPa with increasing Nb from 0 to 6% and then decreases at 8% Nb. Tensile strength at 750 C can reach 465 MPa and the strain is only 2.4% when the Nb content is 6%. The increased strength is resulted from refined microstructure and solid solution of Nb. And the decreased strength is because many B2 phases acts as crack source.

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Effect of growth rate on microstructure and tensile properties of Ti–45Al–2Cr–2Nb prepared by electromagnetic cold crucible directional solidification

Cited by 39 publications

References 40 publications

A Novel Directional Solidification of TiAl-Based Alloys by Electromagnetic Cold Crucible Zone Melting Technology with Y<sub>2</sub>O<sub>3</sub> Moulds

A Novel Directional Solidification of TiAl-Based Alloys by Electromagnetic Cold Crucible Zone Melting Technology with Y<sub>2</sub>O<sub>3</sub> Moulds

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

Effects of Nb on Microstructure and Mechanical Properties of Ti42Al2.6C Alloys

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