Hardening and microstructural reactions in high-temperature equal-channel angular pressed Mg-Nd-Gd-Zn-Zr alloy
G Sha, JH Li, W Xu, K Xia, WQ Jie, SP Ringer
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | ELSEVIER SCIENCE SA | Published : 2010
The use of high-temperature (330°C) equal-channel angular pressing (ECAP) is demonstrated to promote precipitation of a fine and uniform dispersion of the FCC β1 phase in an Mg-Nd-Gd-Zn-Zr alloy. Significantly, this process induces a hardening reaction in the alloy, where isothermal ageing at this temperature leads only to softening. The evolution of microstructure is characterized using transmission electron microscopy and scanning electron microscopy. The nucleation and growth of precipitates during the high-temperature ECAP are discussed. This research highlights a new approach to engineer precipitate microstructures via the application of severe plastic deformation so as to extend the pr..View full abstract
The authors are grateful for scientific and technical input and support from the Australian Microscopy & Microanalysis Research Facility (AMMRF) node at The University of Sydney, and the Australian Research Council with the ARC Centre of Excellence for Design in Light Metals. The assistance of Dr. Bulent Gun and Dr. Yanyan Sun on sample preparation and SEM analysis and the assistance of Dr. Xiaolin Wu and Mr. Jizhong Li on ECAP processing experiments are greatly acknowledged.