Effect of ball milling parameters on the microstructure of W–Y powders and sintered samples

Avettand-Fènoël, Marie-NoËlle; Taillard, Roland; Dhers, J.; Foct, J.

doi:10.1016/s0263-4368(03)00034-9

Cited by 48 publications

(19 citation statements)

References 12 publications

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“…Their morphology showed that they were fused during sintering and this fact, together with the absence of pores in the vicinity of the inclusions, points to a eutectic oxide of Y-W, which was fused during sintering. [10] Their size indicates that the Y 2 O 3 nanoparticles formed agglomerates and were not well dispersed. This agglomeration and the formation of complex Y-W eutectic oxides, which were fused during sintering, reduced the ability of the dispersed nanoparticles to inhibit grain growth.…”

Section: Microstructurementioning

confidence: 99%

Mechanical Behavior of W-Y2O3 and W-Ti Alloys from 25 °C to 1000 °C

Aguirre

Martı́n

Pastor

et al. 2009

Metall Mater Trans A

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The mechanical behavior of pure W, W-0.5 wt pct Y 2 O 3 , and W-4 wt pct Ti manufactured by powder metallurgy was studied from ambient temperature to 1000°C. Y 2 O 3 nanoparticles were added to inhibit grain growth and improve oxidation resistance, while Ti is a sintering activator. Strength and toughness were measured from the three-point bend tests in smooth and notched prismatic bars. The dominant deformation and failure micromechanisms were assessed as a function of temperature for each material through the analysis of the fracture surfaces and transverse cross sections in the scanning electron microscope. In particular, the role played by microstructure, dominant failure mechanisms, and oxidation rates in mechanical behavior were elucidated for each material in the entire temperature range. It was found that Y 2 O 3 improved the high-temperature properties by inhibiting oxidation. The Ti acted as a sintering activator, and the W-Ti alloy was fully dense and presented smaller grain size. Both factors enhanced the mechanical properties at ambient and intermediate temperatures, but the ductile-to-brittle transition temperature (DBTT) of this material was higher, leading to brittle behavior up to very high temperature.

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Section: Microstructurementioning

confidence: 99%

Mechanical Behavior of W-Y2O3 and W-Ti Alloys from 25 °C to 1000 °C

Aguirre

Martı́n

Pastor

et al. 2009

Metall Mater Trans A

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“…Moreover, the rubbing action is also understood as the source of contaminations on work materials, contributed by the wear of the milling balls and the vial. Avettand-Fenoel et al (2003) observed the present of cobalt (Co) and tungsten carbide (WC) in final powder, which was milled in WC/Co milling system. The contamination materials, which were similar to the material of the milling system, clearly indicated that wear of the milling system had occurred during the milling process.…”

Section: Literature Reviewsmentioning

confidence: 99%

Modeling of vial and ball motions for an effective mechanical milling process

Budin

Almanar

Kamaruddin

et al. 2009

Journal of Materials Processing Technology

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“…These problems can be overcome by dispersion strengthening and precipitation hardening, Non-Sag tungsten [11,12] and W-ThO 2 (ODS-W) as examples. However, the radioactive nature of thorium has turned development efforts towards tungsten alloys strengthened by other metal oxides like La 2 O 3 , Y 2 O 3 , HfO 2 , ZrO 2 , CeO 2 [13][14][15][16][17][18]. Dispersed oxide particles inhibit recrystallization and grain growth as well as improving the high temperature strength and creep resistance by hindering grain boundary sliding [14][15][16].…”

Section: Introductionmentioning

confidence: 99%