Numerical analysis of the deformation instability of metals in liquid helium

Numerical results on the discontinuous yielding of austenitic steel and aluminum alloy at a temperature of 4 K are presented. The method used allows qualitative and quantitative predictions of the influence of eight determining factors, including characteristics of the material and parameters of the loading system, on the low-temperature discontinuous deformation of metals. Recommendations are formulated on how to improve standards on tensile testing of metals in liquid helium as regards machine rigidity, standard specimen sizes, and new mechanical characteristics.

► Numerical results on the serrated flow of steel and aluminum alloy are presented.
► Method allows to predict the influence of eight factors on deformation jumps.
► Recommendations to improve standards on tensile testing of metals are formulated.