Experimental constraints on the phase diagram of titanium metal

The α → ω Transformation in Titanium-Cobalt Alloys under High-Pressure Torsion

“…Experimentally determined transition pressure for the α-ω phase transition in pure titanium lies at room temperature between 2 and 12 GPa, depending on the experimental conditions [38][39][40][41][42][43][44][45][46].…”

“…Silver chloride was employed as the pressure medium in the two-stage high-pressure apparatus in [43]. Synchrotron X-ray diffraction experiments were conducted using a cubic anvil apparatus at beamline X17B2 of the National Synchrotron Light Source (NSLS), Brookhaven National Laboratory and at beamline BL14B1 of the Spring-8, Japan [44]. Briefly, a mixture of amorphous boron and epoxy resin was used as pressure-transmitting medium and the amorphous carbon was used as furnace material.…”

“…Briefly, a mixture of amorphous boron and epoxy resin was used as pressure-transmitting medium and the amorphous carbon was used as furnace material. The Ti samples were surrounded by NaCl powders and packed into a cylindrical container of boron nitride, 1.0 mm inner diameter and 2.0 mm length [44]. The transition pressure has been determined as 5.5 GPa [44].…”

“…The α → ω allotropic transformation takes place at high pressures in titanium, zirconium and hafnium as well as in their alloys [3][4][5][6][7][8][9][10]. The transition pressure, the ability of high pressure ω-phase to retain after pressure release, and the pressure interval where α-and ω-phases coexist depend on the conditions of high-pressure treatment [2,[36][37][38][39][40][41][42][43][44][45][46][47][48]. A number of SPD techniques include the application of high pressure, especially the high pressure torsion (HPT) one.…”

Titanium Alloys at Extreme Pressure Conditions

“…Although most of the recent work has involved the use of diamond anvil cells (DACs) to volume compress Ti in the static regime (for example, Ming et al, 1981;Akahama et al, 2001;Vohra et al, 2001;Errandonea et al, 2005), many studies have also utilised large volume presses to statically compress Ti (Jamieson 1963;Jayaraman et al, 1963;Bundy 1963;Bundy 1965;Zhang et al, 2008), and to a lesser extent, shock techniques have been employed to compress Ti in the dynamic regime (see Gray et al, 1993;Trunin et al, 1999;Cerreta et al, 2006).…”