混合稀土对压铸AZ91D合金的组织及力学性能的影响

徐玉磊; 张奎; 李兴刚; 雷健

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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
Effects of Mischmetal on Mechanical Properties and Microstructure of Die Casting Magnesium Alloy AZ91D Magnesium Alloy
2011年31卷第9期页码：820-823
纸质出版日期： 2011 ，
DOI：

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[1]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(09):820-823.

Xu Yulei~1, Zhang Kui~1, Li Xinggang~1, et al. 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.
[1]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(09):820-823. DOI：

Xu Yulei~1, Zhang Kui~1, Li Xinggang~1, et al. 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. DOI：

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。

Abstract

Effects of the mischmetal addition in range of 0.4%

.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.