中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 12 December 2012 |
（1. State Key Laboratory for Fabrication and Processing of Nonferrous Metals,
Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China;
2. National Analysis and Testing Center for Nonferrous Metals & Electronic Materials,
Beijing General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract:Morphology and crystal structure of β precipitate phase in Mg-7Gd-5Y-1Nd-0.5Zr (mass fraction, %) alloy were characterized by optical microscopy, scanning electron microscopy and transmission electron microscopy. Compositions were determined for β phase using thin foil energy dispersive spectroscopy. Precipitation at 400 °C involves formation of platelet and block-shaped β phase. The orientation relationship is and between β precipitate phase and α-Mg matrix with habit planes parallel to , and a composition of Mg5(Y0.4Gd0.4Nd0.2) is suggested for the b phase in Mg-7Gd-5Y-1Nd-0.5Zr alloy.
Key words: Mg-Gd-Y-Nd-Zr alloy; precipitation phase; microstructure; composition; orientation relationship; habit plane
