The Influence of Temperature on Slip Behaviour of Molybdenum Single Crystals Deformed in Tension in the Range from 293 to 573 °K

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Abstract
Cylindrical molybdenum single crystals of middle orientation (Schmid factor ≈ 0.5 on the (101) [111] slip system) grown by electron zone melting were deformed in tension at various temperatures between 293 and 573 °K using a strain‐rate of 7 × 10−6s−1. Stress‐strain curves are parabolic in shape below 340 °K (T< 0.12Tm), whereas they are clearly divided into three work‐hardening stages above 400 °K (0.14Tm<T< 0.20Tm). The variation of yield stress and work‐hardening parameters in dependence on deformation temperature is systematically investigated and the results are discussed with respect to published work on other b.c.c. metals. Furthermore, molybdenum crystals with various specially chosen “single slip” orientations were deformed at 493 °K. It is found that under these conditions the orientation has no pronounced influence on the stress‐strain curve.