Gd含量对砂型铸造Mg-Gd-Y合金组织与性能的影响

任静; 庞松; 刘辰; 杜喜旺; 任政; 徐永东; 朱秀荣; 吴国华

doi:10.15980/j.tzzz.2018.08.004

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Gd含量对砂型铸造Mg-Gd-Y合金组织与性能的影响
Influences of Gd Content on the Microstructure and Mechanical Properties of Sand-cast Mg-Gd-Y Alloys
2018年38卷第8期页码：825-829
纸质出版日期： 2018 ，
DOI： 10.15980/j.tzzz.2018.08.004

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[1]任静,庞松,刘辰,杜喜旺,任政,徐永东,朱秀荣,吴国华.Gd含量对砂型铸造Mg-Gd-Y合金组织与性能的影响[J].特种铸造及有色合金,2018,38(08):825-829.

Ren Jing, Pang Song, Liu Chen, et al. Influences of Gd Content on the Microstructure and Mechanical Properties of Sand-cast Mg-Gd-Y Alloys[J]. Special Casting & Nonferrous Alloys, 2018,38(8):825-829.
[1]任静,庞松,刘辰,杜喜旺,任政,徐永东,朱秀荣,吴国华.Gd含量对砂型铸造Mg-Gd-Y合金组织与性能的影响[J].特种铸造及有色合金,2018,38(08):825-829. DOI： 10.15980/j.tzzz.2018.08.004.

Ren Jing, Pang Song, Liu Chen, et al. Influences of Gd Content on the Microstructure and Mechanical Properties of Sand-cast Mg-Gd-Y Alloys[J]. Special Casting & Nonferrous Alloys, 2018,38(8):825-829. DOI： 10.15980/j.tzzz.2018.08.004.

摘要

通过金相显微镜、扫描电镜、力学性能测试等手段

研究了Gd含量对砂型铸造Mg-Gd-Y合金组织与力学性能的影响

建立了Gd含量与合金中α-Mg平均晶粒尺寸、屈服强度与抗拉强度之间的数学关系

观察了合金断口形貌

分析了合金的断裂行为。随着Gd含量由0增大至12.7%

α-Mg平均晶粒尺寸由112μm减小至54μm

合金的屈服强度由64.9MPa提高至174.3 MPa

抗拉强度由157.5MPa提高至221.2MPa

伸长率由21.3%降低至0.9%。当Gd含量为10.2%时

合金具有最佳的强度与塑性（σ0.2=140.0 MPa

σb=196.1 MPa

δ=3.3%）。

Abstract

Influences of Gd content（0

2.7%）on the microstructure and mechanical properties of sandcast Mg-Gd-Y alloys were investigated by OM（optical microscopy）

SEM（scanning electron microscopy）and tensile test.Relationships between Gd content and the average grain size ofα-Mg

yield strength and ultimate tensile strength were established.The morphology of the fracture was observed

and the crack behavior was described.The average grain size ofα-Mg is decreased from 112μm to 54μm

and yield strength

tensile strength of the alloy are increased from 64.9 MPa to 174.3 MPa and from 157.5 MPa to 221.2 MPa

while elongation is decreased from 21.3%to 0.9% with Gd content increased from 0 to 12.7%in the alloy.The alloy with 10.2% Gd content possesses the desirable mechanical properties

where yield strength

tensile strength and elongation reach 140.0 MPa

196.1 MPa

3.3%

respectively.