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The low-cycle fatigue behavior of a-brass CuZn30 was investigated inuniaxial (tension-compression and torional) and biaxial tests under total strain controlat room temperature. Planar-biaxial fatigue tests were carried out on a servohydraulictension-compression testing machine with and without phase shift using a cruciformspecimen geometry with fixed principal stress axes. In phase and out of phase tensiontorsiontests were performed using tube shape specimens on a servohydraulic tensiontorsiontesting machine. Microstructural investigations were performed by transmissionelectron microscopy as well as by scanning electron microscope. For all proportionalload cases the equivalent strain amplitude based on a maximum shear strain energycriterion results in a similar hardening behavior and in fatigue life times within ascatter band of three. Out of phase loading results in additional cyclic hardening andreduced life time. Planar glide structures were observed in all tested cases as well asareas of pronounced strain localization in the torsional load cases. No evidence oftransition to wavy glide behavior was observed.