| Deformation Behavior of Novel Magnesium Alloys Prepared by Spark Plasma Sintering Studied by the Acoustic Emission Technique Michal Knapek1; Peter Minárik2; 1NUCLEAR PHYSICS INSTITUTE OF THE CAS, Řež, Czech Republic; 2CHARLES UNIVERSITY, DEPARTMENT OF PHYSICS OF MATERIALS, Prague, Czech Republic; PAPER: 333/Magnesium/Regular (Oral) SCHEDULED: 15:15/Thu. 24 Oct. 2019/Adonis ABSTRACT: The spark plasma sintering (SPS) technique was used to prepare a bulk WN43 magnesium alloy from the gas atomized powder. Compression tests were performed to investigate the effect of different sintering regimes on the resulting mechanical properties of the material. It was shown that by increasing the sintering temperature, the ultimate compressive strength and ductility can be significantly improved. Moreover, complementary in-situ acoustic emission (AE) recording was employed to provide insights into microstructural changes during the deformation. Recent advances in the AE signal analysis in the frequency domain, together with microstructure observations, allowed us to reveal the evolution of different deformation mechanisms. It was shown that pronounced twin nucleation takes place around the yield point whereas twin growth and dislocation slip are the dominant deformation mechanisms in the later stages of deformation in this material. |
