Impact Consolidation of the Tungsten Powder in the Wide Range of Temperatures. I. Density and Structure

O. I. Tolochyn, A. V. Laptev, I. Yu. Okun’, Ya. I. Evich

I.M. Frantsevich Institute for Problems of Materials Sciences, NAS of Ukraine, 3 Academician Krzhizhanovskoho Str., UA-03680 Kyiv-142, Ukraine

Received: 27.11.2013. Download: PDF

In vacuum of 0.0133 Pa, impact consolidation of the commercial tungsten powder with a size of particles of 6—10 microns is carried out at temperatures of 850, 1050, 1260, 1450, 1500, 1600, and 1640°C. The isothermal holding before consolidation was 20 min. The obtained samples with a diameter of 25—27 mm and height of $\cong$ 10 mm were cut on two parts, one of which was subjected to annealing at a temperature of 1600°C within the hour. The annealed and not annealed parts of a sample are cut on rectangular bars for determination of density, structure, and mechanical properties. As revealed, almost dense samples are fabricated at a temperature of 1640°C. At a temperature of consolidation of 850°C and 1450°C, the porosity of samples is equal 9.3 and 6.5%, respectively. Annealing of samples reduces porosity by 2%. On the samples compacted at high temperatures and on the annealed samples, the intensive growth of grains is observed. Consolidation at 1500°C leads to the double growth of particles, and consolidation at 1640°C leads to triple growth. Annealing of these samples in addition increases the size of grains by 2—3 times and, as a result, the initial size of particles increases almost by ten times.

Key words: powder, tungsten, impact consolidation, density, structure.

URL: http://mfint.imp.kiev.ua/en/abstract/v36/i01/0017.html

DOI: https://doi.org/10.15407/mfint.36.01.0017

PACS: 81.05.Bx, 81.20.Ev, 81.20.Hy, 81.40.Ef, 81.40.Vw

Citation: O. I. Tolochyn, A. V. Laptev, I. Yu. Okun’, and Ya. I. Evich, Impact Consolidation of the Tungsten Powder in the Wide Range of Temperatures. I. Density and Structure, Metallofiz. Noveishie Tekhnol., 36, No. 1: 17—29 (2014) (in Russian)


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