Neutron diffraction and acoustic emission study of Mg-Al-Sr alloy reinforced with short Saffil (R) fibers deformed in compression

0435766 - ÚJF 2015 CH eng C - Konferenční příspěvek (zahraniční konf.)
Farkas, G. - Máthis, K. - Lukáš, Petr - Pilch, Jan - Vrána, Miroslav - Janeček, M. - Trojanová, Z.
Neutron diffraction and acoustic emission study of Mg-Al-Sr alloy reinforced with short Saffil (R) fibers deformed in compression.
Materials Science Forum. Vol. 777. Stafa-Zurich: Transt Tech Publications Ltd, 2014, s. 92-98. ISSN 0255-5476.
[7th International Conference on Mechanical Stress Evalutaion by Neutrons and Synchrotron Radiation. Sydney (AU), 10.09.2013-12.09.2013]
Institucionální podpora: RVO:61389005
Klíčová slova: magnesium composite * neutron diffraction * residual stress * acoustic emission
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

Neutron diffraction method has been applied in the ex-situ investigation of the residual stresses in Mg-5wt.%Al-1 wt.%Sr (AJ51) magnesium alloy reinforced with short Saffil (R) fibers deformed in compression at room temperature. The residual stresses were measured in the axial and radial directions with respect to the load direction. It is shown that in the initial state the tensile stress is present in the matrix phase. The in-situ acoustic emission measurements were performed with the aim to reveal the main deformation mechanisms operating in the particular stages of the plastic deformation. Ex-situ neutron diffractions experiments showed that the tensile axial residual stress in the matrix increases with increasing plastic deformation while the radial residual stress decreases. In situ acoustic emission measurements indicate that the main deformation mechanisms are twinning and glide of bigger dislocation ensembles in the early stages of the compressive deformation while the fibers breakage was observed in the vicinity of the maximum stress.
Trvalý link: http://hdl.handle.net/11104/0239649