Characterization of β precipitate phase in Mg-7Gd-5Y-1Nd-0.5Zr alloy
来源期刊：Journal of Rare Earths2013年第4期
论文作者：李婷 张奎 杜志伟 李兴刚 李永军 马鸣龙 袁家伟
文章页码：410 - 414
摘 要：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（12）β（100）α,[110] β/[0001] α.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（11）β twin-related variants.A composition of Mg 5（Y0.4Gd0.4Nd0.2） was suggested for the β phase in Mg-7Gd-5Y-1Nd-0.5Zr alloy.
李婷1，张奎1，杜志伟2，李兴刚1，李永军1，马鸣龙1，袁家伟1
1. State Key Laboratory for Fabrication and Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals2. National Analysis and Testing Center for Nonferrous Metals & Electronic Materials,General Research Institute for Nonferrous Metals
摘 要：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（12）β（100）α,[110] β/[0001] α.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（11）β twin-related variants.A composition of Mg 5（Y0.4Gd0.4Nd0.2） was suggested for the β phase in Mg-7Gd-5Y-1Nd-0.5Zr alloy.
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