Thermal equations of state for titanium obtained by high pressure—temperature diffraction studies

Zhang, Jianzhong; Zhao, Yusheng; Hixson, R. S.; Gray, George T.; Wang, L.; Utsumi, Wataru; Saito, Hiroyuki; Takanori, Hattori

doi:10.1103/physrevb.78.054119

Cited by 54 publications

(43 citation statements)

References 27 publications

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“…For pure α-titanium, Zhang et al [55] reported a constant, pressure-independent 2c/a ratio of 1.5868, which agrees well with the generally-accepted value of 1.5871 (from JCPDS Card 44-1294) [56]. Controversially, a large pressure dependence has been reported by Errandonea et al [48], which Zhang et al refute and interpret as a response to deviatoric stresses, occurring in their diamond-anvil cell.…”

Section: Crystallographic Anisotropy Disorder and Transformation Behsupporting

confidence: 66%

“…The original data of Yeoh's publication [31] has been re-visited to extract the listed values at 300 K. Literature values are reported from their experimental findings, in addition to Ghosh's first-principles study [61]. Further listed references are Dubrovinskaia [59], Errandonea [48], Asta [60], Zhang [55], JCPDS [56] and Menon [78]. a, c in (Å); V in (Å3); K 0 in (GPa).…”

Section: Temperature Dependence At High Pressurementioning

confidence: 99%

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Hydrostatic Compression Behavior and High-Pressure Stabilized β-Phase in γ-Based Titanium Aluminide Intermetallics

Liss

Funakoshi

Dippenaar

et al. 2016

Metals

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Titanium aluminides find application in modern light-weight, high-temperature turbines, such as aircraft engines, but suffer from poor plasticity during manufacturing and processing. Huge forging presses enable materials processing in the 10-GPa range, and hence, it is necessary to investigate the phase diagrams of candidate materials under these extreme conditions. Here, we report on an in situ synchrotron X-ray diffraction study in a large-volume press of a modern (α 2 + γ) two-phase material, Ti-45Al-7.5Nb-0.25C, under pressures up to 9.6 GPa and temperatures up to 1686 K. At room temperature, the volume response to pressure is accommodated by the transformation γ → α 2 , rather than volumetric strain, expressed by the apparently high bulk moduli of both constituent phases. Crystallographic aspects, specifically lattice strain and atomic order, are discussed in detail. It is interesting to note that this transformation takes place despite an increase in atomic volume, which is due to the high ordering energy of γ. Upon heating under high pressure, both the eutectoid and γ-solvus transition temperatures are elevated, and a third, cubic β-phase is stabilized above 1350 K. Earlier research has shown that this β-phase is very ductile during plastic deformation, essential in near-conventional forging processes. Here, we were able to identify an ideal processing window for near-conventional forging, while the presence of the detrimental β-phase is not present under operating conditions. Novel processing routes can be defined from these findings.

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Section: Crystallographic Anisotropy Disorder and Transformation Behsupporting

confidence: 66%

Section: Temperature Dependence At High Pressurementioning

confidence: 99%

Hydrostatic Compression Behavior and High-Pressure Stabilized β-Phase in γ-Based Titanium Aluminide Intermetallics

Liss

Funakoshi

Dippenaar

et al. 2016

Metals

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“…This enables one to gather information about the anisotropic nature of deformations in a material. [44] The differential stress also provides a lower bound estimate on the material's yield strength, that is, the stress at which point the material begins to deform plastically. At 25 GPa, osmium supports a maximum differential stress of 10 GPa for the (110) plane, the highest value for any measured metal.…”

Section: New Design Parameters Using Incompressible Transition Metalsmentioning

confidence: 99%

Advancements in the Search for Superhard Ultra‐Incompressible Metal Borides

Levine

Tolbert

Kaner

2009

Adv Funct Materials

338

232

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Dense transition metal borides have recently been identified as superhard materials that offer the possibility of ambient pressure synthesis compared to the conventional high pressure, high temperature approach. This feature article begins with a discussion of the relevant physical properties for this class of compounds, followed by a summary of the synthesis and properties of several transition metal borides. A strong emphasis is placed on correlating mechanical properties with electronic and atomic structure of these materials in an effort to better predict new superhard compounds. It concludes with a perspective of future research directions, highlighting some recent results and presenting several new ideas that remain to be tested.

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“…In order to evaluate the contribution of the entropy as increase in the temperature, Eqs. (16) and (20) are used, together with thermoelastic parameters from [6]. Fig.…”

Section: Entropy Contribution To the Bulk Modulus And Other Thermoelamentioning

confidence: 99%

Zero point corrections and entropy effect on ab-initio equation-of-state: A case study on bulk titanium

Youmbi

Zékeng

Domngang

2010

Journal of Physics and Chemistry of Solids

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Thermal equations of state for titanium obtained by high pressure—temperature diffraction studies

Cited by 54 publications

References 27 publications

Hydrostatic Compression Behavior and High-Pressure Stabilized β-Phase in γ-Based Titanium Aluminide Intermetallics

Hydrostatic Compression Behavior and High-Pressure Stabilized β-Phase in γ-Based Titanium Aluminide Intermetallics

Advancements in the Search for Superhard Ultra‐Incompressible Metal Borides

Zero point corrections and entropy effect on ab-initio equation-of-state: A case study on bulk titanium

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