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2. Slight to moderate deformations
2.1 Heat yield strength
Figure
5
shows variations in the macroscopic yield strength σ
e
of an annealed metal with temperature and strain rate. Essentially, two temperature ranges can be distinguished. At low temperatures, σ
e
decreases very slowly with increasing temperature and does not depend on the strain rate: this range is called the athermal plateau and corresponds to the cold deformation (T/T
f
< 0.3) described elsewhere in this treatise
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Slight to moderate deformations
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