This paper deals with evaluation of degradation processes, which occur at cyclic loading of samples of Al alloy EN AW-2017/T4. NDT procedure – acoustic emission (AE) method was used for detection of microstructure changes during stages of fatigue damage accumulation and micro-cracks initialisation. This measurement was completed with analysis of loading frequency changes of the fatigue test device. AE signal records obtained with use of the newly developed AE analyser with continual recording of signal are commented and showed other parameters of AE sample in detail. There is also presented a new method of mechanical clamping of the AE sensors used at fati- gue tests. Thanks to the placing of the AE sensors in proximity of the area of supposed fatigue crack the significant improvement of the quality of AE data was observed during the fatigue tests.
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