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| Mg-Y-Nd-Zr-Zn 铸造镁合金组织与性能研究 |
| Microstructure and Properties of Mg-Y-Nd-Zr-Zn Casting Magnesium Alloy |
| Received:February 28, 2016 Revised:July 10, 2016 |
| DOI：10.3969/j.issn.1674-6457.2016.04.016 |
| 中文关键词: Mg-Y-Nd-Zr-Zn 合金 T6 组织 力学性能 |
| 英文关键词: Mg-Y-Nd-Zr-Zn alloy T6 microstructure mechanical properties |
| 基金项目: |
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| 中文摘要: |
| 目的 研究 Mg-Y-Nd- Zr-Zn 镁合金的显微组织演变和力学性能。 方法 采用金相显微镜（OM）、扫描电镜（SEM）、能谱（EDS）以及电子万能实验机等，研究了 Mg-Y-Nd- Zr-Zn 镁合金铸态及 T6 态的组织和性能。 结果 Mg-Y-Nd-Zr-Zn 铸态合金组织由含 Y 的镁基固溶体、网状富稀土的共晶相和颗粒状的 Zr 单质组成；经 525 ℃×10 h+200 ℃×16 h 处理后，晶界网状第二相消失，细小的 Mg-RE 金属间化合物从基体中析出，弥散分布于晶界及晶内。 结论 T6 处理后， Mg-Y-Nd-Zr-Zn 合金力学性能显著提高，抗拉强度、屈服强度和断裂伸长率分别为 306 MPa, 230 MPa 和 3.5%。 |
| 英文摘要: |
| In order to study the microstructure evolution and mechanical performance of the Mg-Y-Nd-Zr-Zn magnesium alloy, the microstructure and mechanical performance of Mg-Y-Nd-Zr-Zn alloy of cast and T6 treatment were studied by optical microscopy (OM), scanning electron microscopy (SEM), energy spectrum (EDS) and electronic universal testing machine. The results showed that: the microstructure of cast Mg-Y-Nd-Zr-Zn magnesium mainly included solid solution containing Y, net rare earth-rich eutectic phase and particulate Zr elemental composition. The grain boundary reticular second phase disappeared between small Mg-RE intermetallic compound precipitated from the matrix, dispersed in the grain boundary and grain by the 525 ℃×10 h + 200 ℃×16 h heat treatment. After T6 treatment, the mechanical properties of Mg-Y-Nd-Zr-Zn alloy increases significantly, and the tensile strength, yield strength and break elongation reach 306 MPa and 230 MPa and 3.5% respectively. |
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