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We performed series of multi-step loading tests in our Kolsky bar system, and demonstrated that the thermal softening in strong aluminum alloys can be eliminated by multi-step loading. We showed that there is a significant difference in their stress-strain curves, compared with the result of a single shot test, due to adiabatic heating. The tests were carried out using our interferometry-based system, where the bar velocities are measured directly rather than the strains. The optical techniquedoi:10.1051/epjconf/20122601047 fatcat:gyb3yakhgbg57oercmvy4mkxbe