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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 303-304Liquid-Phase Sintering of Tungsten Heavy Alloys

Liquid-Phase Sintering of Tungsten Heavy Alloys

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Abstract:

Elemental powders of tungsten, nickel, iron and cobalt of compositions corresponding to (W-3.2Ni-0.8%Fe), (W-3.5Ni-1.5%Fe), and (W-4.5Ni-1.0Fe-1.5%Co) were mechanically alloyed in a tumbler rod mill for 2 hrs. Mechanically alloyed powders were liquid phase sintered at 1500oC for 90 min in vacuum. The sintered materials were heated up to 1150-1200oC in vacuum atmosphere, followed by quenching in water to suppress the impurity segregated at grain boundary. The sintered materials were subjected to cold-working by swaging from 8-30% reduction in area. The swaged specimens were age-hardened at 700oC. Full characterization for both the elemental powders and the sintered tungsten alloys were performed using optical microscopy, SEM analysis, EDS quantitative analysis, X-ray diffraction, hardness and compression testing. This paper will discuss the effects of the elemental powders characterization and the liquid phase sintering parameters on the microstructure and strength of these three tungsten heavy alloys.

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Defects and Diffusion in Semiconductors XII

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Periodical:

Defect and Diffusion Forum (Volumes 303-304)

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55-62

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https://doi.org/10.4028/www.scientific.net/DDF.303-304.55

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Online since:

July 2010

Authors:

S.F. Moustafa, S.H. Kaitbay, G.M. Abdo

Keywords:

Dense Alloys, Liquid Phase, Sintering, Tungsten Alloy

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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