Plastic-strain localization in barium fluoride single crystals at elevated temperatures |
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Authors: | N P Skvortsova |
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Institution: | (1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiĭ pr. 59, Moscow, 117333, Russia |
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Abstract: | The strain distribution is studied in BaF2 crystals subjected to compression tests along 110] and 112] at a constant strain rate in the temperature range T = (0.22–0.77)T
m. At T > 0.5T
m, the plastic strain in deformed samples is found to be strongly localized in narrow bands, where the shear strain reaches
several hundred percent. The degree of localization increases with temperature. Localized-shear microbands are shown to be
oriented along {001}〈110〉 slip systems. The phenomenon of serrated yielding is detected, and stress jumps (serrations) are
established to correlate with the formation of shear zones. |
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Keywords: | |
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