Thermal stability and annealing behaviour of ultrafine grained commercially pure titanium

Hoseini, Majid; Pourian, Meysam Hamid; Bridier, Florent; Vali, Hojatollah; Szpunar, Jerzy A.; Bocher, Philippe

doi:10.1016/j.msea.2011.10.062

Cited by 67 publications

(39 citation statements)

References 31 publications

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“…The decrease of the resistivity in Ti-6Al-7Nb alloy above 700°C is caused by increased amount of beta phase. Similar alloy -Ti-6Al-4V -contains around 15% of beta phase at 750°C It is consistent with resistivity measurements and in perfect agreement with other authors [13]. No thermally activated process is observable by SEM or identifiable by in-situ resistivity measurement in CP Ti during heating to 440°C.…”

Section: Overall Resistivity Evolutionsupporting

confidence: 91%

“…Recently, biocompatible UFG betaTi alloys have also been thoroughly investigated [9,10,11,12]. On the other hand, thermal stability of UFG microstructure in Ti and Ti alloys has been only rarely discussed [13,14], despite its significant importance for material processing and eventual low temperature superplasticity [15]. This investigation focuses on thermal stability of UFG microstructure of commercially pure Ti and biocompatible Ti-6Al-7Nb alloy.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure evolution in ultrafine-grained Ti and Ti-6Al-7Nb alloy processed by severe plastic deformation

Stráský

Harcuba

Hájek

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

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Influence of UFG structure formation on mechanical and fatigue properties in Ti6Al-7Nb alloy V V Polyakova, V N Anumalasetty, I P Semenova et al. Abstract. Unique in-situ electric resistivity measurement was utilized to identify microstructural changes in ultra-fine grained commercially pure titanium and Ti-6Al-7Nb alloy. Both materials were prepared by equal channel angular pressing. Changes in resistivity evolution during in-situ heating were compared to scanning electron microscopy observations. Both materials are stable up to 440°C. Further heating at rate 5°C/min causes recovery and recrystallization of UFG structure. At 650°C the microstructure is fully recrystallized. High resolution in-situ electric resistivity measurement is capable of detecting recovery and recrystallization in UFG CP Ti and Ti-6Al-7Nb alloy.

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Section: Overall Resistivity Evolutionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Microstructure evolution in ultrafine-grained Ti and Ti-6Al-7Nb alloy processed by severe plastic deformation

Stráský

Harcuba

Hájek

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Another assumption of these constitutive models is that, they typically consider coarse grained microstructures. However, it was mentioned that the average grain size of UFG titanium remained less than 3.5 μm at 600 °C [9]. This finding was also confirmed in a different study [20,22].…”

Section: Verification Of the Modelsupporting

confidence: 53%

“…For the case of UFG Ti, a majority of the studies concentrated on high-temperature mechanical behavior and microstructural characterizations. Hoseini et al [9] investigated the annealing behavior of UFG Ti, where thermal stability up to 450 °C was demonstrated. Long et al [10] probed the mechanical behavior of UFG Ti in a wide temperature range by demonstrating the compressive deformation response from −196 to 600 °C.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Flow Response Modeling of Ultra-Fine Grained Titanium

Sajadifar

Yapıcı

2015

Metals

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This work presents the mechanical behavior modeling of commercial purity titanium subjected to severe plastic deformation (SPD) during post-SPD compression, at temperatures of 600-900 °C and at strain rates of 0.001-0.1 s −1. The flow response of the ultra-fine grained microstructure is modeled using the modified Johnson-Cook model as a predictive tool, aiding high temperature forming applications. It was seen that the model was satisfactory at all deformation conditions except for the deformation temperature of 600 °C. In order to improve the predictive capability, the model was extended with a corrective term for predictions at temperatures below 700 °C. The accuracy of the model was displayed with reasonable agreement, resulting in error levels of less than 5% at all deformation temperatures.

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“…In order to fully characterize titanium for potential applications under extreme conditions, it is necessary to examine the dynamic mechanical behavior and to clarify the microstructural evolution during dynamic deformation over a wide temperature range. Whilst there are many studies documenting the properties of UFG/NC Ti focusing on annealing instabilities [22], strain hardening behavior [23], tribological properties [24,25] and micro-hardness [26], relatively little attention has been directed towards the effects of strain rate and temperature on the mechanical behavior and the microstructural evolution of UFG/NC Ti during dynamic impact deformation. Accordingly, this research was initiated to examine the dynamic mechanical properties and the microstructural evolution of NC Ti at high strain rates of ~10 3 s -1 over a range of temperatures.…”

Section: Introductionmentioning

confidence: 99%

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

Zhang

Wang

Zhilyaev

et al. 2015

Materials Science and Engineering: A

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The mechanical behavior of commercial purity titanium with a nanocrystalline (NC) grain size was investigated using split Hopkinson pressure bar tests at high strain rates and over a range of temperatures. The study was accompanied by detailed microstructural investigations before and after compression testing. The results show that rotary dynamic recrystallization operates during compressive deformation at strain rates of ~3000 and ~4500 s -1 at temperatures from 298 to 573 K but cells form at 673 K. The dynamic mechanical behavior of NC Ti shows a strong dependence on temperature and strain rate such that the flow stress and the strain hardening rate both increase with increasing strain and decreasing temperature. A constitutive equation is derived to relate the flow stress to the temperature, strain rate and true strain and to predict the yield strength and the peak stress of NC Ti subjected to dynamic deformation at elevated temperatures.

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Thermal stability and annealing behaviour of ultrafine grained commercially pure titanium

Cited by 67 publications

References 31 publications

Microstructure evolution in ultrafine-grained Ti and Ti-6Al-7Nb alloy processed by severe plastic deformation

Microstructure evolution in ultrafine-grained Ti and Ti-6Al-7Nb alloy processed by severe plastic deformation

High Temperature Flow Response Modeling of Ultra-Fine Grained Titanium

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

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