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Increase in the plasticity of molybdenum after high-rate deformation under pressure

Authors
  • Churbaev, R. V.1
  • 1 Russian Academy of Sciences, Mikheev Institute of Metal Physics, Ural Branch, ul. S. Kovalevskoi 18, Ekaterinburg, 620990, Russia , Ekaterinburg (Russia)
Type
Published Article
Journal
The Physics of Metals and Metallography
Publisher
Pleiades Publishing
Publication Date
Dec 15, 2016
Volume
117
Issue
12
Pages
1288–1292
Identifiers
DOI: 10.1134/S0031918X1612005X
Source
Springer Nature
Keywords
License
Yellow

Abstract

The dependence of the plasticity of polycrystalline molybdenum on the strain rate has been studied after deformation performed under pressure and at an ambient temperature of 293 K. The samples were deformed in tensile tests. The strain rate of tensile deformation and the pressure in each experiment are constant. The range of the strain rate is 8.3 × 10−7 to 8.3 m/s and the pressure is 0.1–500 MPa. At a pressure of ambient atmosphere, molybdenum at a strain rate less than 200 s–1 in value (102.3 s–1) fractures in a brittle manner with zero residual strain. The brittle fracture of the working part of a cylindrical sample occurs simultaneously in several places. The molybdenum plasticity decreases in the range of low strain rates regardless of the pressure and, on the contrary, plasticity under pressure increases in the range of high strain rates. The strain rate of tensile deformation at which the dependence of the plasticity on the strain rate under pressure changes is 8.3 × 10–4 m/s (a strain rate of 0.25 s–1). The high plasticity of molybdenum after deformation under pressure is observed at high strain rates.

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