Influence of impurities on the low-temperature deformation of nanocrystalline copper |
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| Authors: | V. V. Shpeizman V. I. Nikolaev B. I. Smirnov A. B. Lebedev V. V. Vetrov S. A. Pul’nev V. I. Kopylov |
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| Affiliation: | (1) A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia;(2) Physicotechnical Institute, Academy of Sciences of Belarus, 220730 Minsk, Belarus |
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| Abstract: | The influence of ZrO2 particles on the low-temperature deformation of nanocrystalline copper produced by strong plastic deformation is investigated using equichannel angular pressing. A comparison is made between the deformation characteristics in tension and compression in the temperature range 4.2–400 K, measured for copper and the composite Cu:0.3 vol. % ZrO2. It is shown that within 4.2–200 K the yield point σ sm of the composite is higher than that for copper, attaining 680 MPa at 4.2 K, then the yield points are close in value up to room temperature, and diverge again as the temperature is raised. Possible causes of the dissimilar influence of an impurity on the strength and plasticity characteristics of nanocrystalline copper in various temperature intervals are discussed. Fiz. Tverd. Tela (St. Petersburg) 40, 1639–1641 (September 1998) |
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