Processing, Microstructure and Mechanical Properties of Ti6Al4V Particles-Reinforced Mg Matrix Composites

doi:10.1007/s40195-016-0473-3

Abstract

Abstract:

Novel Ti6Al4V particles-reinforced AZ91 Mg matrix composites were successfully fabricated by stir casting method. The stirring time in semisolid condition directly affected the particle distribution and the quality of the ingots. Furthermore, the optimal speed of the heating and the liquid stirring could overcome particle settlement caused by the density difference between the matrix and the particles. Ti6Al4V particles distributed uniformly in the composites with different particle contents. The average grain size decreased with the increase in the particle contents. The Ti6Al4V particles bonded pretty well with the alloy matrix. In addition, there were some interfacial reactions in the composites. There were rod-like Al₃Ti phases at the interface. The precipitates extended from the particle surface to the matrix, and they might improve the interfacial bonding strength. The ultimate tensile strength, yield strength and elastic modulus were enhanced as the particle contents increased, and the elongation was much better than that of the same matrix material reinforced with SiC particles. Thus, the novel composites exhibit better comprehensive mechanical properties.

Key words: Magnesium matrix composites, Ti6Al4V particles, Stir casting, Microstructure, Mechanical properties

X. M. Wang,X. J. Wang,X. S. Hu,K. Wu,M. Y. Zheng. Processing, Microstructure and Mechanical Properties of Ti6Al4V Particles-Reinforced Mg Matrix Composites[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(10): 940-950.

Figures/Tables 13

Fig. 1 Melt temperature-time curve for stir casting technological process

Fig. 2 Specific process flow diagram

Fig. 3 OM images of the composites fabricated by different semisolid stir time: a, b 5 min, c, d 10 min, e, f 15 min

Fig. 4 OM images of the composites fabricated by different heating stir speeds: a, b 300 rpm, c, d 600 rpm

Fig. 5 Tensile properties of the composites fabricated by different casting parameters

Fig. 6 SEM micrographs of the composites with different particle contents: a, b 10%, c, d 15%, e, f 20%

Fig. 7 OM images of AZ91 alloy and the composites with different particle volume fractions: a, b AZ91 alloy, c, d 10%, e, f 15%, g, h 20%

Fig. 8 Average grain sizes of AZ91 alloy and TC4p/AZ91 composites with different volume fractions

Fig. 9 Element distribution near the TC4 particles in the 35 μm 10 vol.% TC4p/AZ91 composites: a SEM image around the TC4 particles, b Mg, c Ti, d Al, e V, f Zn

Fig. 10 TEM micrograph of the interface between the TC4 particles and the matrix in the composites: a the morphology of the interface, b the SAED pattern of Al3Ti

Fig. 11 Mechanical properties of the composites with different particle volume fractions: a YS and UTS, b elongation and elastic modulus

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