Structure and properties of Ta-Zr alloy obtained by high-speed melt quenching from liquid state-Reference-Cited by-同舟云学术

Structure and properties of Ta-Zr alloy obtained by high-speed melt quenching from liquid state

Published:2021-06-13 Issue:3 Volume: Page:66-72
ISSN:2412-8783
Container-title:Izvestiya Vuzov. Tsvetnaya Metallurgiya (Universities' Proceedings Non-Ferrous Metallurgy)
language:
Short-container-title:Izv.VUZ. Tsvet. Met.

Author:

Serov M. M.¹,Patrushev A. Yu.¹,Farafonov D. P.²,Valeev R. A.²,Safaryan A. I.³

Affiliation:

1. All-Russian Scientific Research Institute of Aviation Materials (ARSRIAM); Moscow Aviation Institute (National Research University) (MAI (NRU))

2. All-Russian Scientific Research Institute of Aviation Materials (ARSRIAM)

3. Moscow Aviation Institute (National Research University) (MAI (NRU))

Abstract

The paper considers the effect of Ta-Zr binary system splat quenching implemented by the method of pendant drop melt extraction. The study was conducted using two mixtures of tantalum and zirconium elementary powders with a content of 60 and 6 % of tantalum respectively. After mixing, the compositions were pressed at 250 MPa in a steel mold on a hydraulic press. Sintering was carried out in a vacuum furnace at 1350 °C and a pressure of 10-3 Pa. Splat quenching was carried out in a vacuum at 2•10-2 Pa using electron-beam heating and a spinning disk absorber. Resulting fiber thickness was 15 to 80 gm. The results of testing splat-quenched Ta—Zr alloy discrete fibers and samples formed as a result of rod stock melting by electron-beam heating (as-cast) were studied and compared. It was found that the structure of splat-quenched fibers of the alloy with a Ta content of 6 wt.% consists of 5—10 gm needle-shaped grains, and the alloy with a Ta content of 60 wt.% has a columnar dendritic structure. A study of tantalum and zirconium distribution across the fiber cross-section showed that cooling rate reduction to less than 105 K/s leads to monotectoid transformation in the alloy with a tantalum content of 60 wt.%. It was found that for an alloy with 6 wt.% Ta the fiber microhardness value is 1.5 times higher in comparison with the same alloy without quenching, and for an alloy with Ta 60 wt.% it is higher by a factor of two.

Publisher

National University of Science and Technology MISiS

Subject

Metals and Alloys

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