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首页> 外文会议>Annual Meeting Exhibition of The Minerals, Metals Materials Society >Intermetallic Phase Formation in Mg-Ag-Nd (QE) and Mg-Ag-Nd-Zn (QEZ) Alloys
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Intermetallic Phase Formation in Mg-Ag-Nd (QE) and Mg-Ag-Nd-Zn (QEZ) Alloys

机译：Mg-Ag-Nd（QE）和Mg-Ag-Nd-Zn（QEZ）合金中的金属间相形成

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The intermetallic phase (designated 8 phase) in the solution-treated microstructure of commercial magnesium alloy QE22 (Mg-2.5Ag-2.0Nd-0.7Zr, wt%) has been investigated using scanning electron microscopy, electron diffraction, atomic-resolution scanning transmission electron microscopy (STEM), and thermodynamic modeling. In contrast to the previous reports, an orthorhombic structure (space group Cmcm) and a composition of NdAgMgn are determined. The present experimental data are used to construct a thermodynamic description of the Mg-Ag-Nd system which is embedded in a multicompo-nent Mg alloy database. Implications on the formation of temperature range and thermal stability of this phase and alloy solidification are discussed based on the calculated Mg-Nd-Ag phase diagram and Scheil solidification paths of alloys. The impact of Ag-replacement in such QE alloys by Zn-addition in the Mg-Ag-Nd-Zn (QEZ) alloy system is elaborated using appropriate thermodynamicsimulations to reveal the competition with other inter-metallics. These data are suggested to contribute to ICME of magnesium alloys.
机译：使用扫描电子显微镜，电子衍射，原子分辨率扫描变速器研究了商业镁合金QE22（Mg-2.5Ag-2.0nd-0.7Zr，WT％）的溶液处理过的微观结构中的金属间相相（指定的8相）电子显微镜（Stew）和热力学建模。与先前的报告相比，确定正交结构（空间组CMCM）和NDAGMGN的组成。本实验数据用于构建嵌入在多组分Mg合金数据库中的Mg-Ag-Nd系统的热力学描述。基于计算出的Mg-Nd-Ag相图和合金的Scheil凝固路径，讨论了对该相和合金凝固的温度范围和热稳定性的影响。使用适当的热工摩擦，阐述了在Mg-Ag-Nd-Zn（QEZ）合金系统中通过Zn加成的这种QE合金中的Ag替代的影响，以揭示与其他金属间的竞争。建议这些数据有助于ICME镁合金。

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