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High-Pressure Melting Curve Of Titanium

Di: Ava

Here we show, through high-precision shock experiments and high-fidelity simulations, that the shock response of Ti64 is stiffer than in pure Ti and that the melting point on the Hugoniot is at a lower pressure and temperature than pre-viously assumed. In this paper, the mechanical behaviour and microstructure evolution of TC4 titanium alloy during high temperature plastic deformation are studied. Th Titanium-hydrogen interaction at high pressure June 2018 Journal of Applied Physics 123 (23):235901 DOI: 10.1063/1.5038933 Authors:

Titanium-hydrogen interaction at high pressure

In this work, the melting line of platinum has been characterized both experimentally, using synchrotron X-ray diffraction in laser-heated diamond-anvil cells, and theoretically, using ab initio simulations. In the investigated pressure and We report high-pressure measurements for the melting curve of Ti, V, Cr, Mo, Ta, W, Fe, Co, and Ni. Measurements were made in a laser-heated diamond-anvil-cell to nearly 100 GPa and 4000 K. The

Titanium Alloys at Extreme Pressure Conditions | IntechOpen

Modification of titanium microstructure after propagation of a melting shock wave (SW) generated by a femtosecond laser pulse is investigated experimentally and Reentrant melting is generally considered an unusual phe-nomenon [1,2] that is associated with a negative slope of the melting temperature versus pressure line, or the melting curve. An “ordinary” melting curve, rising from low temper-atures and pressures, may eventually invert its trend at some maximum temperature, with a change of slope from positive to negative values for Determination of the high pressure melting curve of Fe-Si using in situ and ex situ intermetallic fast diffusion technique Provided constraint on the melting temperature profile of Mercury’s core

We also performed thermodynamic modeling, which well reproduces the change in the curvature of FeH melting curve upon the loss of magnetism and extrapolates the experimental constraints to inner core pressures. The XRD data showed that non-magnetic FeH melts congruently at temperatures higher than the known eutectic melting curve for The high-pressure melting curve of titanium has been studied up to 120 GPa and ∼3500 K using both laser-heated diamond anvil cells and ab initio molecular dynamic simulations. Request PDF | On Mar 14, 2025, K. V. Khishchenko published Equation of State for Titanium at High Pressures | Find, read and cite all the research you need on ResearchGate

The melting curve of NH4HF2 I rises from 125.2°C at atmospheric pressure to a triple point II/I/liquid at 9.3 kbar, 220°C. The I/II phase boundary is

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It is worth noting that the melting curve of metals to very high pressure can be well predicted by our model only needing two experimental data at low pressures.

melting curve is simultaneously the distinct curve between mo-lecular and atomic and the distinct curve between nonmetallic and metallic hydrogen at high pressure. The melt curve represents the largest rheological transition a material can undergo, from a material with strength to one without. The melt curve at high pressure is also an extremely sensitive test of our understanding of material behavior as the free energy surfaces of the high-temperature solid and liquid are nearly parallel. Unfortunately, for some materials As shown in the phase diagrams of titanium and carbon dioxide, the typical slope of the melting curve is generally positive. This means that as pressure increases, so does the melting point. However, it is important to note that this boundary isn’t always a straight line; the melting point usually behaves nonlinearly with respect to pressure. Melting Point Behavior of Water Water

Thermodynamic properties of titanium from ab initio calculations

Lazor, G. Shen, and S. Saxena, Laser-heated diamond anvil cell experiments at high pressure: Melting curve of nickel up to 700 kbar, Phys. Chem. Miner.20, 86 (1993). [110] The crystal structure of titanium at ambient temperature and pressure is close-packed hexagonal (α) with a c/a ratio of 1.587. Slip is possible on the pyramidal, prismatic and basal planes in the close-packed directions. At about 890 o C, the titanium undergoes an allotropic transformation to a body-centred cubic β phase which remains stable to the melting temperature.

The paper presents ab initio studies into the relative stability of the crystalline structures of copper, silver, and platinum up to high pressures at ? ≥ 0 K. Our calculations in quasiharmonic approximation suggest that not the fcc structure of Cu and Ag, but the body-centered cubic one, is thermodynamically most favorable at ? ≳ 1 0 0 GPa and ?> 3 kK. The This phase diagram is topologically similar to the ab initio phase diagram of Smirnov [18], except that their melting curve of bcc-Cu seems to be

It is also important to point out that the melt curve of the 2162 EOS is located at slightly higher temperatures than the previous 2161 EOS, based primarily on the experimental data provided in Shock experiments similar to those for pure titanium did not show any evidence of split-ting of the shock or any retention of the ω phase on release [27]. In addition, the shock velocity-particle velocity curve for the alloy lies above that for pure titani-um at pressures above 10 GPa. The high-pressure melting curve of titanium has been studied up to 120 GPa and ∼3500 K using both laser-heated diamond anvil cells and ab initio molecular dynamic simulations.

Vapor pressures of Ru, Nb, and Ti as function of temperature. The points correspond to experimental data while the continuous lines correspond to plots of the Clausius-Clapeyron curve. AbstractIn this work, the melting line of platinum has been characterized both experimentally, using synchrotron X-ray diffraction in laser-heated diamond-anvil cells, and theoretically, using ab initio simulations. In the investigated pressure and temperature range (pressure between 10 GPa and 110 GPa and temperature between 300 K and 4800 K), only the face-centered cubic This table gives coefficients in an equation for the vapor pressure of metallic elements in both the solid and liquid state. Vapor pressure in the range of 10-15 to 10-3-atmare covered.

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  • Vapor pressures of Ru, Nb, and Ti as function of temperature.

In this report, we present results of high-pressure experiments probing the melt line of zirconium (Zr) up to 37 GPa. This investigation has determined that temperature versus laser power curves

1. Introduction. Titanium has long been known to have three stable phases at low pressures: [1] α which is stable at room temperature and pressure, ω which is stable at higher pressures and β which is stable at higher temperatures. Recently, two additional high pressure phases of titanium at room temperature were discovered: δ and γ [2, 3] and one phase, which

Second, it can soundly expand the equation of state for the solid phase towards higher pressures and temperatures, at least through to the highest measured melting point in the phase diagram. Third, it can predict the liquid phase compressibility up to a maximum measured pressure in the melting curve. Experimental data for the thermodynamic properties of titanium on the melting curve in the pressure range from atmospheric value to 90 GPa are analyzed and brought into correspondence. The problems that have been considered are (i) the lack of data for the solid β-phase density near the normal melting point and (ii) the formation probability of a triple point on In situ characterization of the high pressure – high temperature melting curve of platinum Received: 8 April 2019 Accepted: 29 August 2019 Published: xx xx xxxx

In this work, the melting line of platinum has been characterized both experimentally, using synchrotron X-ray diffraction in laser-heated diamond-anvil cells, and theoretically, using ab initio simulations. In the investigated pressure and temperature range (pressure between 10 GPa and 110 GPa and temperature between 300 K and 4800 K), only the face-centered cubic phase of The laser-heated diamond anvil cell grants access to the conditions of deep planetary interiors in the laboratory. However, large thermal gradients and temporal heating instabilities can lead to uncertainties of several hundred Kelvin that limit the accuracy of measured data, can prohibit analyses requiring long acquisition times, and makes the production of stable melt volumes In situ characterization of the high pressure – high temperature melting curve of platinum Received: 8 April 2019 Accepted: 29 August 2019 Published: xx xx xxxx Simone Anzellini 1, Virginia Monteseguro 2, enrico Bandiello2, Agnès Dewaele3, Leonid Burakovsky4 &

The melting curve of Nb is determined and evidence for a solid-solid phase transformation in Nb with increasing temperature is found. The high-temperature phase of Nb is orthorhombic Pnma.