Microstructural Evolution and Mechanism of Solidified TiAl Alloy Applied Electric Current Pulse

doi:10.11900/0412.1961.2018.00504

Acta Metall Sin

2019, Vol. 55

Issue (5): 611-618 DOI: 10.11900/0412.1961.2018.00504

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Microstructural Evolution and Mechanism of Solidified TiAl Alloy Applied Electric Current Pulse

Zhanxing CHEN,Hongsheng DING(

),Ruirun CHEN,Jingjie GUO,Hengzhi FU

1. National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Cite this article:

Zhanxing CHEN,Hongsheng DING,Ruirun CHEN,Jingjie GUO,Hengzhi FU. Microstructural Evolution and Mechanism of Solidified TiAl Alloy Applied Electric Current Pulse. Acta Metall Sin, 2019, 55(5): 611-618.

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Abstract

As a new type of lightweight and high temperature structural material, TiAl alloy has become the most ideal candidate in the fields of aerospace, military and civil products, and it has a good perspective in the industrialization. Refining and improving the microstructure of TiAl alloys has higher theoretical significance and engineering value. In this work, the solidified Ti-48Al-2Cr-2Nb alloy applied electric current pulse is studied, and its microstructural evolution and mechanism are analyzed. The results show that the electric current pulse refines the primary dendrite arm spacing, columnar crystal size and interlamellar spacing of the Ti-48Al-2Cr-2Nb alloy. The primary phase is α without electric current pulse, the angle of the Ti-48Al-2Cr-2Nb alloy that between the lamellar orientation and the growth direction is usually bigger, even perpendicular to the growth direction approximately. The applied electric current pulse causes the dendrite to melt and break, and promotes the occurrence and increase of the primary β phase, the lamellae orientation having a small angle or 45° between the growth direction is further increasing. The electric current pulse reduces the solid-liquid phase free energy and atomic diffusion activation energy, reduces the nucleation barrier and the critical nucleation energy, thereby atomic diffusion and the crystallization nucleation is promoted to a certain extent, the primary dendritic spacing and columnar crystals are remarkably refined. The electric current pulse causes the transformation of the primary phase and its corresponding crystal orientation relationship is the main reason for the change of lamellar orientation.

Key words: electric current pulse TiAl alloy microstructural evolution lamellar orientation

Received: 07 November 2018

ZTFLH:

TG113.12

Fund: National Natural Science Foundation of China(51171053);National Natural Science Foundation of China(51471062);National Natural Science Foundation of China(51671072)

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	Zhanxing CHEN
	Hongsheng DING
	Ruirun CHEN
	Jingjie GUO
	Hengzhi FU

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00504 OR https://www.ams.org.cn/EN/Y2019/V55/I5/611

Table 1 Parameters of electric current pulse acting on Ti-48Al-2Cr-2Nb alloy

Fig.1 Dendritic morphologies of Ti-48Al-2Cr-2Nb alloy with electric current pulse(a) no current (b) 32 mA/mm², 100 Hz (c) 64 mA/mm², 100 Hz(d) 96 mA/mm², 100 Hz (e) 64 mA/mm², 50 Hz (f) 64 mA/mm², 200 Hz

Fig.2 Primary dendritic arm spacing (PDAS) of Ti-48Al-2Cr-2Nb alloy affected by current density (frequency is 100 Hz) (a) and frequency (current density is 64 mA/mm²) (b)

Fig.3 Microstructures of solidified Ti-48Al-2Cr-2Nb alloy with electric current pulse(a) no current (b) 32 mA/mm², 100 Hz (c) 64 mA/mm², 100 Hz(d) 96 mA/mm², 100 Hz (e) 64 mA/mm², 50 Hz (f) 64 mA/mm², 200 Hz

Fig.4 Normal frequency distributions of lamellar orientation for solidified Ti-48Al-2Cr-2Nb alloy with different parameters of electric current pulse

Fig.5 Lamellar structures of Ti-48Al-2Cr-2Nb alloy solidified with electric current pulse(a) no current (b) 32 mA/mm², 100 Hz (c) 64 mA/mm², 100 Hz(d) 96 mA/mm², 100 Hz (e) 64 mA/mm², 50 Hz (f) 64 mA/mm², 200 Hz

Fig.6 Interlamellar spacing of solidified Ti-48Al-2Cr-2Nb alloy affected by current density (frequency is 100 Hz) (a) and frequency (current density is 64 mA/mm²) (b)

Fig.7 Schematics of the relationship between the lamellar orientation and the growth direction of different primary phasesColor online(a) crystal orientation and lamellar orientation of α phase (b) crystal orientation and lamellar orientation of β phase

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