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| 混合稀土对压铸AZ91D合金的组织及力学性能的影响 | |
| 引用本文： | 徐玉磊,张奎,李兴刚,雷健.混合稀土对压铸AZ91D合金的组织及力学性能的影响[J].特种铸造及有色合金,2011,31(9):820-823. |
| 作者姓名： | 徐玉磊 张奎 李兴刚 雷健 |
| 作者单位： | 1. 北京有色金属研究总院有色金属制备加工国家重点实验室;内蒙古科技大学材料与冶金学院 2. 北京有色金属研究总院有色金属制备加工国家重点实验室 3. 东风汽车有限公司商用车技术中心工艺研究所 |
| 基金项目： | 国家“十二五”科技支撑计划资助项目(2011BAE22B01); 内蒙古科技大学创新基金项目(2010NC018) |
| 摘 要： | 研究了不同添加量的混合稀土对压铸AZ91D合金的组织和力学性能的影响。添加混合稀土后,常温力学性能没有明显改善。在100℃时,混合稀土含量为0.4%的压铸AZ91D合金的力学性能与不含混合稀土的试样几乎相等。在170℃时,混合稀土含量为0.4%的压铸AZ91D合金的抗拉强度、屈服强度及伸长率分别为206MPa、142MPa、26%,比不含混合稀土的压铸AZ91D试样的力学性能分别提高15.7%、10%及30%。这是因为添加适量的混合稀土后,形成热稳定性较高的强化相,增加了位错滑移阻力并阻碍裂纹扩展,镁基体中稀土元素起到固溶强化作用,从而提高镁合金的高温抗拉强度。 |
| 关 键 词： | 压铸镁合金 稀土 力学性能 组织 |
Effects of Mischmetal on Mechanical Properties and Microstructure of Die Casting Magnesium Alloy AZ91D Magnesium Alloy |
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| Xu Yulei,Zhang Kui,Li Xinggang,Lei Jian.Effects of Mischmetal on Mechanical Properties and Microstructure of Die Casting Magnesium Alloy AZ91D Magnesium Alloy[J].Special Casting & Nonferrous Alloys,2011,31(9):820-823. | |
| Authors: | Xu Yulei Zhang Kui Li Xinggang Lei Jian |
| Affiliation: | Xu Yulei~1,3,Zhang Kui~1,Li Xinggang~1,Lei Jian~2(1.State Key Laboratory for Fabrication and Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals,2.Material Technology Institute of CVTC,Dongfeng Motor Co.,Ltd,3.School of Materials and Metallurgy,Inner Mongolia University of Science and Technology) |
| Abstract: | Effects of the mischmetal addition in range of 0.4%~1.7% on the microstructure mechanical properties of die casting AZ91D alloy were investigated to improve the elevated tempurature mechanical properties of the alloy.The results reveal that ambient tempurature mechanical properties of the alloy are almost independent of the mischmetal addition.Mechanical properties of the die casting AZ91D alloy with 0.4% mischmetal addition at 100℃ are near to those of the alloy at room temperature.Tensile strength,yield strength and elongation of the die casting AZ91D-0.4MM at 170 ℃ reach 206 MPa,142 MPa and 26%,respectively,increased by 15.7%,10%,and 30%,respectively,compared with those of die casting AZ91D alloy without MM addition,which is attributed to the formation of strengthening phase with high thermal stability due to the addition of proper MM increasing the dislocation sliding restrain the propagation of crack as well as the solid solution strengthening effects in the magnesium matrix. |
| Keywords: | Die Casting Magnesium Alloy MM Mechanical Properties Microstructure |
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