Increase in the plasticity of molybdenum after high-rate deformation under pressure
| Autor: | R. V. Churbaev |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Materials science Strain (chemistry) 020502 materials Metallurgy 02 engineering and technology Plasticity Strain rate Condensed Matter Physics 020901 industrial engineering & automation Fracture toughness Brittleness 0205 materials engineering Ultimate tensile strength Materials Chemistry Slow strain rate testing Composite material Deformation (engineering) |
| Zdroj: | The Physics of Metals and Metallography. 117:1288-1292 |
| ISSN: | 1555-6190 0031-918X |
| DOI: | 10.1134/s0031918x1612005x |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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