Yield Behavior of Dislocation‐Free Germanium from 500°C to the Vicinity of the Melting Point
作者:
J. R. Patel,
P. E. Freeland,
期刊:
Journal of Applied Physics
(AIP Available online 1967)
卷期:
Volume 38,
issue 8
页码: 3087-3090
ISSN:0021-8979
年代: 1967
DOI:10.1063/1.1710067
出版商: AIP
数据来源: AIP
摘要:
The yield behavior of dislocation‐free germanium has been measured over its entire plastic range. Crystals of germanium were stressed in tension from 500°C, where the crystals first deform without fracture, to 930°C (7°C below the melting point). Over this entire range a pronounced yield drop is observed. The shapes of the stress‐strain curves at the highest and lowest test temperatures are remarkably similar even though the magnitudes differ by about a factor of 40. Both the maximum and flow stresses decrease exponentially with temperature and follow a relation of the form &tgr; =Aexp (E/kT). The maximum and flow stresses also were measured at constant temperature over two orders of magnitude change in strain rate. The results are compared with the theoretical predictions of the temperature and strain‐rate dependence of the maximum and flow stresses.
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