| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Light Metal Technology
|
| Presentation Title |
Elastic-plastic Approach on Transformation of LPSO Phases in a Mg-RE Alloy by Nanoindentation |
| Author(s) |
Petra Maier, Merle Schmahl, Claudia Fleck |
| On-Site Speaker (Planned) |
Petra Maier |
| Abstract Scope |
Nanomechanical analysis of extruded Mg-Dy-Nd-Zn-Zr with modified LPSO-phase morphologies by heat-treatment provide an insight on the elastic-plastic behavior of the phase transformation and microstructural changes. The focus lies on the H/E and H³/E²-ratios of the initial and solution heat-treated alloy with adapted annealing times, 0.5 to 120h, and cooling rates. The fine grains and blocky and lamellar LPSO-phases change during solution heat-treatment in coarser grains with partially dissolved LPSO-phases, until the enrichment of the Mg-matrix after long annealing times causes reactivated precipitation of LPSO-lamellae and grain size reduction. With a hardness maximum at 24h also the H/E-ratio shows the highest values, for LPSO-phases higher than the solid matrix and LPSO-lamellae containing grains. There is no trend for E. The H³/E²-ratio shows a peak at 24h for the solid matrix. The peak value for H³/E² of the LPSO-lamellae containing grains seems to corelate with the highest grain size at 72h. |