Formation of titanium hydride in Ti–6Al–4V alloy

Luo, Liangshun; Su, Yanqing; Guo, Jingjie; Fu, Hengzhi

doi:10.1016/j.jallcom.2006.01.014

Cited by 71 publications

(34 citation statements)

References 20 publications

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“…For some cases of HE, hydride formation plays a central role in the detoriation process. A hydride is a brittle non-metallic phase that may cause the embrittlement of metallic materials such as titanium-and zirconium-based alloys and reduce their load bearing capabilities (Coleman and Hardie 1966;Coleman et al 2009;Chen et al 2004;Luo et al 2006). For metal based components exposed to hydrogen-rich environments, such as fuel cladding materials in nuclear power reactors or components in rocket engines, there is an impending risk of hydrides forming, which could lead to the so called delayed hydride cracking (DHC).…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of liquid crystalline phases of dodecyltrimethylammonium chloride

Kocherbitov

2015

Journal of Molecular Liquids

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The formation of a second phase in presence of a crack in a crystalline material is modelled and studied for different prevailing conditions in order to predict and a posteriori prevent failure, e.g. by delayed hydride cracking. To this end, the phase field formulation of Ginzburg-Landau is selected to describe the phase transformation, and simulations using the finite volume method are performed for a wide range of material properties. A sixth order Landau potential for a single structural order parameter is adopted because it allows the modeling of both first and second order transitions and its corresponding phase diagram can be outlined analytically. The elastic stress field induced by the crack is found to cause a space-dependent shift in the transition temperature, which promotes a second-phase precipitation in vicinity of the crack tip. The spatiotemporal evolution during nucleation and growth is successfully monitored for different combinations of material properties and applied loads. Results for the second-phase shape and size evolution are presented and discussed for a number of selected characteristic cases. The numerical results at steady state are compared to mean-field equilibrium solutions and a good agreement is achieved. For materials applicable to the model, the results can be used to predict the evolution of an eventual second-phase formation through a dimen-

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Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of liquid crystalline phases of dodecyltrimethylammonium chloride

Kocherbitov

2015

Journal of Molecular Liquids

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“…A model of eutectoid transformation has been established by Shan et al [26] and Luo et al [30] to explain the mechanism of d hydride formation in b phase according to the TieH and Tie6Ale4VeH phase diagram. However, the distinct differences between microstructures of TC21 alloy hydrogenated at 550 C and 650 C in the present work show the formation mechanisms of d hydride in TC21 alloy cannot be explained by eutectoid transformation.…”

Section: Discussion On the Formation Mechanism Of Hydridementioning

confidence: 99%

Effect of temperature on hydrogen absorption characteristic and microstructural evolution of TC21 alloy

Yuan

Zheng

Wang

et al. 2015

Journal of Alloys and Compounds

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“…The absorption curve shows that the final amount of hydrogen atoms absorbed in the specimen comes from two parts: one part is absorbed during the melting process (I ¼ 250 A) and another part is absorbed during the cooling process (I ¼ 0 A). During the A / B melting process, the hydrogen percentage decreases immediately at the melting beginning and the hydrogenation process takes about 230 s. The hydrogen absorption rate in melt is much faster than that in solid [19]. The hydrogen percentage remains nearly unchanged during the B / C melting process, which means that the TC21 melt is saturated with hydrogen under the temperature and pressure conditions.…”

Section: 2mentioning

confidence: 99%