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For polycrystalline deformation in metals such as Zircaloy-4, the slipstrength at different strain rates will control mechanical response andstrongly influence the anisotropy of plastic deformation. In this work, theslip activity and strain rate sensitivity of the <a> basal, <a> prismatic, and<c+a> pyramidal slip systems were explored by testing at variable strain rates(1E-4 s^-1 and 125 s^-1) using single crystal micropillar compression tests.These systematic experiments enabled the direct fitting of the strain ratesensitivities of the different slip systems using a simple analytical model toreveal that deformation will be accommodated using different slip systemsdepending on the strain rate of deformation in addition to the stress state(i.e. Schmid's law). This insight helps inform metal forming and understandingof the mechanical performance of these engineering alloys in the extremes ofservice conditions.

Characterisation of the strain rate sensitivity of basal, prismatic and pyramidal slip in Zircaloy-4 using micropillar compression