Abstract
A Ti-15Mo/TiB metal–matrix composite was produced by spark plasma sintering at 1400 °C. The fractions of the elements in the initial powder mixture were 80.75 wt.% Ti, 14.25 wt.% Mo, and 5 wt.% TiB2. The initial structure of the synthesized composite was composed of bcc β titanium matrix and needle-like TiB reinforcements with an average thickness of 500 ± 300 nm. Microstructure and mechanical properties of the composite were studied after laser beam welding (LBW) was carried out at room temperature or various pre-heating temperatures: 200, 400, or 600 °C. The quality of laser beam welded joints was not found to be dependent noticeably on the pre-heating temperature; all welds consisted of pores the size of which reached 200–300 µm. In contrast to acicular individual particles in the base material, TiB whiskers in the weld zone were found to have a form of bunches. The maximum microhardness in the weld zone (~700 HV) was obtained after welding at room temperature or at 200 °C; this value was ~200 HV higher than that in the base material.
Highlights
A significant increase in strength and hardness of titanium and titanium alloys can be achieved via creating titanium-based composites reinforced with hard ceramic particles [1,2,3,4]
The initial structure of the synthesized composite was composed of bcc β titanium matrix and needle-like TiB reinforcements with an average thickness of 500 ± 300 nm
Microstructure and mechanical properties of the composite were studied after laser beam welding (LBW) was carried out at room temperature or various pre-heating temperatures: 200, 400, or 600 ◦C
Summary
A significant increase in strength and hardness of titanium and titanium alloys can be achieved via creating titanium-based composites reinforced with hard ceramic particles [1,2,3,4]. Laser beam welding (LBW) is an innovative joining technology which allows optimized joining of complex geometrical forms in terms of mechanical stiffness, strength, production velocity, and visual quality [20,21,22,23]. This method is very attractive for use in the aviation industry for welding of aircraft fuselages [24]. Mao et al obtained porosity free laser beam welded butt joints using Ti– 6.0Al–3.6Sn–4.1Zr–1.0Nb–0.2Mo–0.34Si alloy reinforced with TiB and La2O3 particles [27]. The aim of this work was to study structure and properties of welds in a Ti-15Mo/TiB metal–matrix composite obtained using LBW at different pre-heating temperatures
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