Effect of Ti Particles on the Microstructure and Mechanical Properties of AZ91 Magnesium Matrix Composites

doi:10.1007/s40195-023-01618-4

Abstract

Abstract:

Spherical micro-Ti particle (TiP)-reinforced AZ91 magnesium alloy composites were fabricated by semi-solid stirring assisted ultrasonic vibration, which were then subjected to hot extrusion. The microstructure results showed that the addition of Ti particles refined the grain size and decreased the texture intensity of the as-extruded AZ91 alloy. An Al₃Ti phase with a thickness of 100 nm formed at the Ti/Mg interface, which had a non-coherent relationship with the magnesium matrix. The as-extruded 1 vol.% TiP/AZ91 composite exhibited the best comprehensive mechanical properties, with yield strength, ultimate tensile strength, and elongation at break of 366 MPa, 456 MPa, and 14.6%, respectively, which were significantly higher than those of the AZ91 alloy. Therefore, the addition of Ti particles can improve the strength and ductility of the AZ91 alloy, demonstrating the value of magnesium matrix composites for commercial applications.

Key words: Magnesium matrix composites, Ti particles, Interface, Mechanical properties

Lu Xiao, Ting-Ting Liu, Yue Chu, Bo Song, Jie Zhao, Xian-Hua Chen, Kai-Hong Zheng, Fu-Sheng Pan. Effect of Ti Particles on the Microstructure and Mechanical Properties of AZ91 Magnesium Matrix Composites[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(3): 513-524.

Figures/Tables 14

Fig. 1 XRD patterns of as-extruded TiP/AZ91 composites: a AZ91, b 1 vol.% TiP/AZ91, c 2 vol.% TiP/AZ91, d 3 vol.% TiP/AZ91

Fig. 2 OM images of the as-extruded TiP/AZ91 composites: a AZ91, b 1 vol.% TiP/AZ91, c 2 vol.% TiP/AZ91, d 3 vol.% TiP/AZ91

Fig. 3 SEM images of the as-extruded TiP/AZ91 composites: a AZ91, b 1 vol.% TiP/AZ91, c 2 vol.% TiP/AZ91, d 3 vol.% TiP/AZ91

Fig. 4 Band contrast and grain size distribution maps of a AZ91, b 1 vol.% TiP/AZ91, c 2 vol.% TiP/AZ91, d 3 vol.% TiP/AZ91

Fig. 5 Inverse pole figure and the pole figure of the as-extruded TiP/AZ91 composites on the ED-TD plane: a AZ91, b 1 vol.% TiP/AZ91, c 2 vol.% TiP/AZ91, d 3 vol.% TiP/AZ91

Fig. 6 a HAADF image and corresponding EDS maps of the 1 vol.% TiP/AZ91 composite: b Mg, c Al, d Zn, e Mn, f Ti

Fig. 7 Line scanning analysis of the 1 vol.% TiP/AZ91 composite near the Ti particles: a HAADF image, b line scanning results

Fig. 8 EDS spectra at the Ti particle interface in 1 vol.% TiP/AZ91 composite: a HAADF, b point 1, c point 2, d point 3, e point 4

Fig. 9 Ti/Mg interfacial structure of the TiP/AZ91 composite: a TEM image; b HRTEM of the yellow block region in a; c Mg/Al3Ti interface with the fast Fourier transform (FFT) pattern of the Mg matrix and Al3Ti; d Al3Ti /Ti interface with the FFT pattern of Ti

Table 1 Experimental and standard values of the lattice parameters for Ti, Al3Ti, and Mg

	JCPDS data			Measured and calculated values
	(uvtw)/(hkl)	d (nm)	a, c (nm)	d (nm)	a, c (nm)
Ti	(10-11)	0.22430	a = 0.29505	0.22433	a = 0.29510
Ti	(10-12)	0.17262	c = 0.46826	0.17264	c = 0.46828
Al₃Ti	(004)	0.21460	a = 0.38537	0.21527	a = 0.38519
Al₃Ti	(110)	0.27250	c = 0.85839	0.27237	c = 0.86108
Mg	(0-11-1)	0.24524	a = 0.32094	0.24519	a = 0.32115
Mg	(11-2-2)	0.13664	c = 0.52112	0.13658	c = 0.51947

Fig. 10 Tensile stress-strain curves of the as-extruded TiP/AZ91 composites at room temperature

Fig. 11 Tensile strength and elongation at break of the Ti/AZ91 composites and other AZ91 magnesium composites

Fig. 12 SEM fracture morphology of the as-extruded TiP/AZ91 composites: a AZ91, b 1 vol.% TiP/AZ91, c 2 vol.% TiP/AZ91, d 3 vol.% TiP/AZ91

Fig. 13 Contributions of the relevant reinforcement mechanisms to YS

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