罗宁,林贵强,娄崟崟,等.Sm对AZ31-0.5Ni镁合金组织与性能影响的研究[J].精密成形工程,2025,17(5):67-76.
LUO Ning,LIN Guiqiang,LOU Yinyin,et al.Microstructures and Properties of AZ31-0.5Ni Magnesium Alloys with Different Content of Sm[J].Journal of Netshape Forming Engineering,2025,17(5):67-76. |
| Sm对AZ31-0.5Ni镁合金组织与性能影响的研究 |
| Microstructures and Properties of AZ31-0.5Ni Magnesium Alloys with Different Content of Sm |
| 投稿时间：2024-12-16 |
| DOI：10.3969/j.issn.1674-6457.2025.05.008 |
| 中文关键词: 钐 镁合金 微观组织 腐蚀速率 力学性能 |
| 英文关键词: Sm magnesium alloy microstructure corrosion rate mechanical property |
| 基金项目:江西省教育厅科学技术研究项目(GJJ211440，GJJ2201226) |
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| 中文摘要: |
| 目的 以AZ31-0.5Ni合金为基础，通过添加不同含量稀土元素Sm，制备不同合金成分的镁合金，研究合金的组织与性能，以获得综合性能良好的可溶性镁合金，为开发低成本高强度的可溶性镁合金提供依据。方法 采用电阻炉对铸态合金进行熔炼，对获得的铸态合金进行热挤压以制备出挤压态合金。采用扫描电镜(SEM)、X射线衍射(XRD)等分析手段对合金组织进行观察，并对合金的力学性能与腐蚀性能进行研究。结果 在铸态合金中，随Sm含量的增加，Mg17Al12含量减少，Al2Sm相不断增多，且Al11Sm3形态会发生一定改变。在挤压态合金中，Sm含量的增加能提高合金屈服强度，当Sm的质量分数为4%时，其抗拉强度、屈服强度和伸长率分别为270 MPa、180 MPa和13.7%。随Sm含量的增加，合金的腐蚀速率不是单调变化。Al2Sm、Mg17Al12、Al11Sm3与α-Mg基体之间的相对电势差分别约为390、300和200 mV，这可能是导致腐蚀速率变化的内在原因。结论 Sm可以改善AZ31-0.5Ni合金的屈服强度，本实验结果可为低成本高强度可溶性镁合金的开发提供依据。 |
| 英文摘要: |
| The work aims to prepare AZ31-0.5Ni-based magnesium alloys of with different content of rare earth Sm to study the microstructure and properties of the alloys, so as to obtain soluble magnesium alloys with good comprehensive properties. The as-cast alloy was melted in a resistance furnace, and the obtained as-cast alloy was subject to hot extrusion to prepare the as-extruded alloy. The microstructure of the alloy was observed by analytical methods such as scanning electron microscopy (SEM) and X-ray diffraction (XRD), and the mechanical properties and corrosion resistance of the alloy were studied. The results showed that with the increase of Sm, the content of Mg17Al12 decreased, the Al2Sm phase increased. In addition, the morphology of Al11Sm3 phase changed from rod-shaped to fan-shaped with the increase of rare earth Sm content. The yield strength of the as-extruded alloy could be improved by increasing the Sm content, and when the Sm content was 4wt.%, the tensile strength, yield strength and elongation were 270 MPa, 180 MPa and 13.7%, respectively. The corrosion rate of the alloy did not change monotonically with the increase of Sm content. The relative potential difference between Al2Sm, Mg17Al12, Al11Sm3 and α-Mg matrix was different, which was about 390, 300 and 200 mV, respectively. This might be the internal cause leading to the change in the corrosion rate. In conclusion, Sm can improve the yield strength of AZ31-0.5Ni alloy. The results of this test can provide a basis for the development of low-cost and high-strength soluble magnesium alloys. |
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