Determination of crystallite size, strain and solubility in mechanically alloyed W-xTi (x=0.5, 1.0, 4.0 and 10.0 wt%) powder alloys

Jahangiri, Hadi; Öveçoğlu, M. Lütfi

doi:10.1016/j.matlet.2016.04.158

Cited by 18 publications

(3 citation statements)

References 6 publications

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“…However, a later study performed by Jahangiri [31] on the effects of MA and Ti content on the effective lattice parameter, crystallite size and lattice strain of W with different fractions of Ti, proved that Ti-phase was still present for alloys containing 4 wt% Ti, as the calculated solubility of Ti for this alloy was 1.78 wt% (6.5 at%) after 10 h milling time. Furthermore, they observed that with the increase of MA duration, so does the solubility of Ti.…”

Section: Materials Compositionmentioning

confidence: 92%

Effect of Ti and TiC alloyants on the mechanical properties of W–based armour materials

Tejado

Martı́n

Pastor

2019

Journal of Nuclear Materials

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The main requirements of tungsten materials for structural divertor applications comprise properties like high thermal conductivity, high-temperature strength and stability, high recrystallization temperature, and enough ductility for an operation period of about two years under massive neutron load [1]. However, the mechanical properties of tungsten commercial products are still one of the main concerns for their use in structural armour applications. With the aim of improving this aspect, two W/Ti based products are presented in this paper: (1) a W-Ti alloy with a Ti solid solution and (2) an UFG microstructure product with TiC dispersed particles; both with the aim of obtaining a suitable fusion armour material with enhanced properties, especially at very high temperatures when pure tungsten suffers strong thermal degradation. It has been reported that strength and recrystallization control can be improved with dispersed TiC particles which inhibits the grain growth. Furthermore, both flexural strength and fracture toughness were twice and even three times higher than the ones observed for our reference pure tungsten produced by the same group and technique, which is, indeed, a great success. However, the intrinsic brit-tleness of tungsten cannot be enhanced by particle dispersion or solid solution with Ti. On the contrary, intergranular rupture is enhanced even more, and the DBTT is even higher than that of pure W.

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Section: Materials Compositionmentioning

confidence: 92%

Effect of Ti and TiC alloyants on the mechanical properties of W–based armour materials

Tejado

Martı́n

Pastor

2019

Journal of Nuclear Materials

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“…Bruker® Diffracplus EVA software was utilized to identify crystalline phases in the XRD patterns using the International Centre for Diffraction Database (ICDD) PDF-2 2016. Average crystallite sizes and lattice strains of the milled powders were calculated using TOPAS 4.2 (Bruker AXS) software [25]. Average particle sizes of the milled powders were which contained amorphous B and different amounts of W powders were sintered by hot-pressing method [23].…”

Section: Characterizationmentioning

confidence: 99%

Effect of tungsten disilicide addition on tungsten boride based composites produced by milling-assisted pressureless sintering

et al. 2018

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In this study, tungsten boride (WB and W 2 B) based composites with various amounts of tungsten disilicide (WSi 2) addition were fabricated by using a combined method of mechanical milling (MM), cold isostatic pressing (CIP) and pressureless sintering (PS). MM was conducted for 4 h in ethanol (wet milling) and Argon atmosphere (dry milling) using a high-energy ball mill. WSi 2 was used with different amounts (0, 5, 10 and 20 wt.%) in order to investigate its effect on the resultant products. MM'd powders were compacted using CIP under a pressure of 450 MPa, and were consecutively sintered at 1600 °C for 2 h and 1770 °C for 2 h under Ar atmosphere. Compositional, physical and microstructural characterizations of the samples were performed using stereo and optical microscopes, X-ray diffractometer, TOPAS software, scanning electron microscope coupled with an energy-dispersive spectrometer, particle size analyzer and gas pycnometer. Sintered products were also characterized in terms of Archimedes density and Vickers microhardness. Moreover, the oxidation studies of the samples were performed at 500 and 1000 °C via thermogravimetric analyzer. The results showed that the highest density, microhardness and oxidation stability values amongst the fabricated composites were obtained for the dry milled and sintered WB-20 wt.% WSi 2 sample.

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“…However, a later study performed by Jahangiri (Jahangiri & Öveçoğlu 2016) on the effects of MA and Ti content on the effective lattice parameter, crystallite size and lattice strain of W with different fractions of Ti, proved that Ti-phase was still present for alloys containing 4 wt% Ti, as the calculated solubility of Ti for this alloy was 1.78 wt% (6.5 at%) after 10 h milling time. Furthermore, they observed that with the increase of MA duration, so does the solubility of Ti.…”

Section: Microstructurementioning

confidence: 92%

Performance of structural materials for the DEMO divertor

Garrido¹

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I would like to thank all the people who contributed in some way to the work described in this thesis. First and foremost, I owe my deepest gratitude to my supervisor Prof. José Ygnacio Pastor. Without his guidance, enthusiasm, encouragement and continuous optimism, this thesis would hardly have been completed. And I would also like to extend my appreciation to Toñi, for her warmest support since my first day at the Department.

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Determination of crystallite size, strain and solubility in mechanically alloyed W-xTi (x=0.5, 1.0, 4.0 and 10.0 wt%) powder alloys

Cited by 18 publications

References 6 publications

Effect of Ti and TiC alloyants on the mechanical properties of W–based armour materials

Effect of Ti and TiC alloyants on the mechanical properties of W–based armour materials

Effect of tungsten disilicide addition on tungsten boride based composites produced by milling-assisted pressureless sintering

Performance of structural materials for the DEMO divertor

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