2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 5: Composite, Ceramic, Quasi-crystals, Nanomaterials & Coatings
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 578 pages |
| ISBN: | 978-1-987820-07-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
CD shopping page
Electron Microscopy Study of Strengthening Phases in Mg Alloys
Wei Sun1;1INSTITUTE OF MICROSTRUCTURE AND PROPERTY OF ADVANCED MATERIALS, BEIJING UNIVERSITY OF TECHNOLOGY, Beijing, China;
Type of Paper: Regular
Id Paper: 200
Topic: 6
Abstract:
By means of a combination of SEM, TEM and HREM techniques, the strengthening structures and their changes in heat treated Mg-Gd-Nd and Mg-Gd-Y-Zn alloys have been investigated. HREM observations directly show that the early-aging-stage structure in the Mg-15. 4Gd-1. 6Nd (wt.%) alloy aged at 200°C is characterized by formation of various local ordering of RE solute atoms due to their rearrangements in the Mg matrix. These local ordered structures, which can act as embryos of precipitates are quite small with a size of only a few nanometers. For the Mg97.4-xGd1.8Y0.8Znx (at.%) alloy system, we have found that Zn-content can improve the aging-hardening response at 200°C significantly, and also can affect the formation and stability of long-period stacking (LPS) structure. Various strengthening phases formed at different aging states have been identified and their structural evolutions during aging processes revealed by HREM will be reported.