|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Magnesium Technology 2021
||Microstructure and fracture toughness of an extruded Mg-Dy-Nd-Zn-Zr alloy influenced by heat treatment
||Petra Maier, Benjamin Clausius, Charis Joy, Roman Menze, Benjamin Bittner, Norbert Hort
|On-Site Speaker (Planned)
The influence of microstructural changes induced by heat treatment on fracture toughness is investigated for a resorbable Mg-Dy based alloy. The initial condition is a fine-grained, hot-extruded RESOLOY (Mg-Dy-Nd-Zn-Zr) alloy consisting of lamellar LPSO structures within the matrix. Solution heat treatment causes grain growth and the formation of bulk LPSO phases. The amount of the lamellar LPSO structures reduces. Static C-Ring tests with and without Ringer solution were used to evaluate force-displacement curves and their fracture energy. The coarser-grained alloys tend to twin under plastic deformation, which is influencing the crack propagation. Bulk LPSO phases clearly hinder crack growth. The fine-grained extruded condition shows the highest force and displacement values to induce the crack, the microstructure consisting of a good balance of grain size, matrix and bulk LPSO phases and twins show highest fracture energy. Even there might be an absorption of hydrogen, the ductility under stress corrosion is high.