Acoustic emission study of high temperature deformation of Mg-Zn-Y alloys with LPSO phase

0492072 - ÚJF 2019 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Fekete-Horváth, Klaudia - Drozdenko, D. - Máthis, K. - Garcés, G. - Dobroň, P.
Acoustic emission study of high temperature deformation of Mg-Zn-Y alloys with LPSO phase.
Minerals, Metals and Materials Series. Vol. F7. Les Ulis: Springer, 2018, s. 203-208. ISBN 978-3-319-72331-0. ISSN 2367-1181.
[International Symposium on Magnesium Technology. Phoenix (US), 11.03.2018-15.03.2018]
Grant CEP: GA MŠMT EF16_013/0001794
Institucionální podpora: RVO:61389005
Klíčová slova: acoustic emission * high temperature * LPSO phase * mechanical properties * Mg alloys
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

Magnesium alloys with different content of zinc (Zn) and yttrium (Y) were extruded at an extrusion ratio of 18:1 at 350 °C. The alloying elements in both Mg alloys formed a long period stacking ordered (LPSO) phase, which during the extrusion process was elongated along the extrusion direction (ED). The magnesium matrix has bimodal character composed by fine dynamically recrystallized (DRX-ed) grains and initial coarse grains elongated along ED. Compression tests with concurrent acoustic emission (AE) measurements were performed along ED at 200, 300, and 400 °C. The deformation mechanisms and the mechanical properties at 200 °C are very similar to those obtained at ambient temperatures, i.e. in the alloy with low volume fraction of the LPSO phase (<10%) twinning controls the yielding, while in the alloy with high volume fraction of the LPSO phase (around 35%) dislocation slip and kink formation are dominant. At 300 °C the reinforcing effect of the LPSO phase is reduced and at 400 °C it is not effective anymore.
Trvalý link: http://hdl.handle.net/11104/0285640