Characterization of p precipitate phase in Mg-7Gd-5Y-1Nd-0.5Zr alloy |
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Authors: | LI Ting ZHANG Kui DU Zhiwei LI Xinggang LI Yongjun MA Minglong YUAN Jiawei |
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Affiliation: | 1. State Key Laboratory for Fabrication and Processing of Nonferrous Metals, General Research lnstitute for Nonferrous Metals, Beijing 100088, China 2. National Analysis and Testing Center .for Nonferrous Metals & Electronic Materials, General Research Institute .for Nonferrous MetaLs, Beijing 100088, China) |
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Abstract: | As reported in our previous works, a Mg-7Gd-5Y-1Nd-0.5Zr alloy recently developed exhibited remarkable age-hardening responses and excellent mechanical properties at both room and elevated temperatures. In Mg-7Gd-5Y-1Nd-0.5Zr alloy, the β precipitate phase was assumed to be one of the main strengthening phases in peak-aged samples. This study aimed to determine the crystal structure and orientation relationship of the β precipitate phase in Mg-7Gd-5Y-1Nd-0.5Zr alloy using transmission electron microscopy and high-resolution electron microscopy. The results indicated that the β precipitate had a face-centered cubic structure with a lattice parameter of a=2.22 nm. The orientation relationship between the β precipitate phase and the α-Mg matrix was . The β plates formed on prismatic planes could play an important role in alloy strengthening by proving effective barriers to gliding dislocations. A single β plate often contained several domains of twin-related variants. A composition of Mg5(Y0.4Gd0.4Nd0.2) was suggested for the β phase in Mg-7Gd-5Y-1Nd-0.5Zr alloy. |
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Keywords: | Mg-7Gd-5Y-lNd-0.5Zr alloy β precipitate phase high-resolution electron microscopy crystal structure orientation rela-tionship rare earths |
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