The aim of this study is to understand the low cyclefatigue behaviour of #beta# treated zirconium. It focusesespecially on the contribution of twinning mechanisms. In situfatigue tests performed inside a scanning electron microscopeallow the observation of the activation of twins and their partialreversibility, depending on the applied stress. Moreover, theacoustic signature (shape factor) of the different twinning systemshas been characterized allowing the following of inception andevolution of twins during the fatigue tests. Finally, theconsequence of such a partial irreversibility on damage and cracklocalization is shown.
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