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| 稀土元素Y对挤压态Mg-Zn-Y-Zr合金的微观组织及力学性能的影响 |
| Influences of Rare Earth Element Y on Microstructure and Mechanical Properties of Hot-extruded Mg-Zn-Y-Zr Magnesium Alloys |
| Received:December 15, 2017 Revised:March 10, 2018 |
| DOI：10.3969/j.issn.1674-6457.2018.02.002 |
| 中文关键词: Mg-Zn-Y-Zr镁合金 挤压 屈服强度 拉压不对称性 |
| 英文关键词: Mg-Zn-Y-Zr magnesium alloy extrusion yield strength tension-compression yield asymmetry |
| 基金项目:国家自然科学基金（51401064）；山东省科技发展计划（2014GGX10211）；山东省科技重大专项（2015ZDJQ02002） |
| Author Name | Affiliation | | MA Li-min | Harbin institute of Technology at Weihai, Weihai 264209, China | | WANG Hai-xuan | Taiyuan University of Science and Technology, Taiyuan, 030024, China | | ZHANG Li-xin | 1. Harbin institute of Technology at Weihai, Weihai 264209, China
2. Naval Aeronautical Engineering Institute, Yantai 264001, China | | CHEN Wen-zhen | Harbin institute of Technology at Weihai, Weihai 264209, China |
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| 中文摘要: |
| 目的 研究Y含量对Mg-Zn-Y-Zr镁合金棒料的显微组织和力学性能的影响规律，为镁合金成分设计提供参考。方法 通过对7种Y含量不同的Mg-Zn-Y-Zr镁合金挤压棒料的显微组织及室温拉伸/压缩力学性能测试，分析Y元素对挤压态镁合金组织和力学性能的影响。结果 随着Y的质量分数由0%增加到2.4%，挤压态Mg-Zn-Y-Zr的平均晶粒尺寸由17.9 μm减小到7.2 μm，拉伸屈服强度由161.2 MPa升高至230.8 MPa，压缩屈服强度由127 MPa升高至209 MPa。结论 挤压态Mg-Zn-Y-Zr镁合金的晶粒随Y元素含量的增加逐渐细化，室温拉/压强度随Y含量的增加而升高，但相比拉伸屈服强度，镁合金压缩屈服强度随Y含量增加升高得更明显一些。Y含量的增加利于Mg-Zn-Y-Zr镁合金拉压不对称性的改善。 |
| 英文摘要: |
| The paper aims to study influences of Yttrium content on microstructure and mechanical properties of Mg-Zn-Y-Zr magnesium alloys to provide reference for composition design of magnesium alloy. By metallographic observation and room-temperature tension/compression mechanical tests of hot-extruded Mg-Zn-Y-Zr magnesium alloys of 7 difference types of Yttrium content, influences of Yttrium content on microstructure and mechanical properties of extruded magnesium alloy were analyzed. With the increase of mass fraction of Y from 0% to 2.4%, the average grain size of extruded Mg-Zn-Y-Zr decreased from 17.9 μm to 7.2 μm; the tensile yield strength increased from 161.2 MPa to 230.8 MPa; and the compressive yield strength increased from 127 MPa to 209 MPa. Grains of extruded Mg-Zn-Y-Zr magnesium alloys are refined gradually with the increase of Y content and the tension/compression strength at room temperature increase with the increase of Y content. However, compared with the tensile yield strength, the compressive yield strength of magnesium alloy increases more evidently. Therefore, increase of yttrium contributes to the improvement of the tension-compression yield asymmetry (TCYA) of Mg-Zn-Y-Zr magnesium alloy. |
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