Effects of Zr Content on the Microstructures and Tensile Properties of Ti-3Al-8V-6Cr-4Mo-xZr Alloys

doi:10.1007/s40195-016-0443-9

Abstract

Abstract:

The microstructural evolution and tensile properties of Ti-3Al-8V-6Cr-4Mo-xZr (x = 0, 2, 4 and 6) titanium alloys were investigated. The precipitated phases and tensile fracture morphologies were observed using scanning electron microscopy and transmission electron microscopy. Experimental results show that the presence of trace impurity Si and the addition of Zr induce the formation of (TiZr)₆Si₃ silicides. The quantity of silicides increases with Zr content increasing. The dispersed silicides refined the grain size of β Zr-containing alloys, and the grain size decreases significantly with Zr content increasing. Accompanying these microstructural changes, the strength of the alloys is enhanced gradually with the increase of Zr content, which is attributed to the combination of precipitation strengthening and grain refinement.

Key words: Titanium alloy, Microstructure, Silicide, Grain size, Tensile properties

Hong-Bo B,Li-Min Dong,Zhi-Qiang Zhang,Dong-Sheng Xu,Rui Yang. Effects of Zr Content on the Microstructures and Tensile Properties of Ti-3Al-8V-6Cr-4Mo-xZr Alloys[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(8): 722-726.

Figures/Tables 6

Fig. 1 Microstructures and grain-size distribution histograms of solution-treated Ti-3864x alloys: a, e Ti-38640; b, f Ti-38642; c, g Ti-38644; d, h Ti-38646

Fig. 2 BSE images of Ti-38640 a, Ti-38642 b, Ti-38644 c and Ti-38646 d and EDX spectra of matrix e and white particles f in c

Fig. 3 TEM image a, corresponding SAED pattern b, energy-dispersive spectra of the matrix c and the precipitate d for the solution-treated Ti-38644 alloy

Fig. 4 Tensile properties of solution-treated Ti-3864x alloys

Fig. 5 Fracture surfaces of solution-treated Ti-3864x alloys at different magnifications: a, e Ti-38640; b, f Ti-38642; c, g Ti-38644; d, h Ti-38646

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