Interfacial Reaction of Ti6Al4V Lattice Structure-Reinforced VW92 Alloy Matrix Composites

doi:10.1007/s40195-023-01549-0

Abstract

Abstract:

A novel melting infiltration by ultrasonic vibration was investigated and applied to fabricate Ti6Al4V (TC4) lattice structure-reinforced Mg-10Gd-2Y-1Zn-xZr (refer to VW92 hereafter, x = 0, 0.5 wt%) alloy matrix composites. The edge-to-edge matching model indicates that the well-matching and possible orientation relationships (ORs) between the α-Mg and α-Ti, [10-10]_α_-Mg//[11-23]_α_-Ti in (0002)_α_-Mg//(10-10)_α_-Ti possesses the smallest misfit of 0.4% (f_r), and thus the α-Mg grains can nucleate on the TC4 lattice structure. Interfacial reaction occurred in the TC4/VW92 + 0.5 wt% Zr composites, and the reaction product was confirmed to be Al₂Zr₃, AlZr₂ and α-Ti (Zr) particles formed by continuous solution of Zr-Ti. Among the interfacial products, the AlZr₂ phase is a brittle phase with high-volume fraction, which is not conducive to the load transfer. But generally speaking, the α-Ti (Zr) and the α-Mg tend to form a coherent interface, which is beneficial for improving the interfacial bonding strength of composites.

Key words: TC4, VW92 composites, TC4 lattice structure, Interfacial reaction, Mismatch

Haijun Wang, Renju Cheng, Xianhua Chen, Mingbo Yang, Daiyi Deng, Lirui Liu, Yongfeng Zhou, Yanlong Ma, Kaihong Zheng, Fusheng Pan. Interfacial Reaction of Ti6Al4V Lattice Structure-Reinforced VW92 Alloy Matrix Composites[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(3): 570-576.

Figures/Tables 6

Fig. 1 Melting infiltration process of TC4/VW92 composites by ultrasonic vibration

Fig. 2 SEM micrographies of the TC4/VW92 composites: a, b 0.5 wt% Zr; c, d Zr-free

Table 1 Misfit and mismatch of matching directions (rows) and planes between α-Mg and α-Ti

Rows		Planes		Possible OR_S
α-Mg α-Ti	f_r	α-Mg α-Ti	f_d	Possible OR_S
[11-19]//[11-19]	8.06%	(10-11)//(10-11) (10-11)//(10-10)	8.5%	[11-20]_α_-Mg//[11-20]_α-Ti in (0002)_α_-Mg//(10-10)_α_-Ti
[11-19]//[11-19]	8.06%	(10-11)//(10-11) (10-11)//(10-10)	- 4.2%	[11-20]_α_-Mg//[11-20]_α-Ti in (0002)_α_-Mg//(10-10)_α_-Ti
[10]//[11-22]	8.06%	(10-11)//(0002) (10-10)//(10-11)	- 39%	[10-10]_α_-Mg//[11-23]_α_-Ti in (0002)_α_-Mg//(10-10)_α_-Ti
[10]//[11-22]	8.06%	(10-11)//(0002) (10-10)//(10-11)	19.2%
[10]//[11-22]	0.4%	(10-10)//(10-10) (10-10)//(0002)	8%
[10]//[11-22]	0.4%	(10-10)//(10-10) (10-10)//(0002)	22.7%	[10-10]_α_-Mg//[11-23]_α_-Ti in (0002)_α_-Mg//(10-10)_α_-Ti
[11-22]//[11-10]	16.9%	(0002)//(10-11) (0002)//(10-10)	13.8%
[11-22]//[11-10]	16.9%	(0002)//(10-11) (0002)//(10-10)	1.9%
[11-22]//[11-22]	10.1%	(0002)//(0002)	- 30.9%

Fig. 3 a BF-TEM micrograph and SAED patterns in the interface of the TC4/VW92 (0.5 wt% Zr) composites; b BF-TEM micrograph of the interfacial reaction products; c HRTEM micrograph of the partial area in Fig. 3b; d HADDF-TEM micrograph and EDS points and EDS maps in partial area of Fig. 3a

Fig. 4 a BF-TEM micrographs of the interfacial reaction products of TC4/VW92 (0.5 wt% Zr) composites and SAED patterns of continuous phase; b HRTEM micrograph between the short stick phase and Mg matrix; c HRTEM micrographs of the partial area in Fig. 4b and the FFT results; d HRTEM micrograph between the short stick phase, particles phase and Mg matrix; e HR-TEM micrographs of the particle phase and the FFT results; f HADF-TEM micrographs and EDS maps of three phases

Fig. 5 Specific interfacial reaction process of TC4/VW92(0.5 wt% Zr) composites

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