挤压参数对Mg–2.49Nd–1.82Gd–0.2Zn–0.2Zr合金微观组织、织构及室温力学性能的影响

张晨锦; 杨光昱; 肖磊; 阚志勇; 郭静; 李强; 介万奇

doi:10.1007/s12613-024-2918-4

Volume 32 Issue 1

Jan. 2025

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文章导航 > 矿物冶金与材料学报（英文） > 2025 > 32(1): 136-146

Chenjin Zhang, Guangyu Yang, Lei Xiao, Zhiyong Kan, Jing Guo, Qiang Li, and Wanqi Jie, Effects of the extrusion parameters on microstructure, texture and room temperature mechanical properties of extruded Mg–2.49Nd–1.82Gd–0.2Zn–0.2Zr alloy, Int. J. Miner. Metall. Mater., 32(2025), No. 1, pp. 136-146. https://doi.org/10.1007/s12613-024-2918-4

Cite this article as:

Chenjin Zhang, Guangyu Yang, Lei Xiao, Zhiyong Kan, Jing Guo, Qiang Li, and Wanqi Jie, Effects of the extrusion parameters on microstructure, texture and room temperature mechanical properties of extruded Mg–2.49Nd–1.82Gd–0.2Zn–0.2Zr alloy, Int. J. Miner. Metall. Mater., 32(2025), No. 1, pp. 136-146. https://doi.org/10.1007/s12613-024-2918-4

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研究论文

挤压参数对Mg–2.49Nd–1.82Gd–0.2Zn–0.2Zr合金微观组织、织构及室温力学性能的影响

1)
西北工业大学凝固技术国家重点实验室, 西安 710072, 中国
2)
福州大学材料科学与工程学院, 福州 350108, 中国
3)
曲靖师范学院化学与环境科学学院, 曲靖 655011, 中国

通讯作者:
杨光昱 E-mail: ygy@nwpu.edu.cn

文章亮点

(1)系统研究了不同挤压参数（挤压温度、挤压比及挤压速率）对合金微观组织的影响

(2)建立了不同挤压参数下合金的组织、织构演变与力学性能的内在联系

(3)定量计算合金的不同强化机制贡献值

中文摘要

Mg–2.49Nd–1.82Gd–0.2Zn–0.2Zr挤压合金的微观组织、织构和室温力学性能在不同的挤压温度（260和320°C）、挤压比（10:1、15:1和30:1）以及挤压速度（3和6 mm/s）下分别进行了系统研究。结果表明，挤压后的晶粒尺寸远小于均匀化合金的晶粒尺寸，第二相沿挤压方向呈流线型分布。随着挤压温度从260°C升高到320°C，合金的微观结构、织构及力学性能变化较小。随着挤压比从10:1增加到30:1，动态再结晶程度和晶粒尺寸增加，强度逐渐下降，而延伸率则有所提高。随着挤压速度从3 mm/s增加到6 mm/s，晶粒尺寸和动态再结晶程度显著增加，样品呈现出典型的<2$ \stackrel{-}{1}\stackrel{-}{1} $1>–<$ 11\stackrel{-}{2}3 $>稀土织构取向。以挤压温度260°C、挤压比10:1和挤压速度3 mm/s挤压的合金表现出213 MPa的抗拉屈服强度和30.6%的延伸率。通过定量分析强化机制的贡献，发现晶界强化和位错强化在强化贡献中起到了主要作用。这些结果为拓宽镁稀土挤压合金的工业应用提供了一些基础指导。

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Research Article

Effects of the extrusion parameters on microstructure, texture and room temperature mechanical properties of extruded Mg–2.49Nd–1.82Gd–0.2Zn–0.2Zr alloy

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Abstract

Abstract

Microstructure, texture, and mechanical properties of the extruded Mg–2.49Nd–1.82Gd–0.2Zn–0.2Zr alloy were investigated at different extrusion temperatures (260 and 320°C), extrusion ratios (10:1, 15:1, and 30:1), and extrusion speeds (3 and 6 mm/s). The experimental results exhibited that the grain sizes after extrusion were much finer than that of the homogenized alloy, and the second phase showed streamline distribution along the extrusion direction (ED). With extrusion temperature increased from 260 to 320°C, the microstructure, texture, and mechanical properties of alloys changed slightly. The dynamic recrystallization (DRX) degree and grain sizes enhanced as the extrusion ratio increased from 10:1 to 30:1, and the strength gradually decreased but elongation (EL) increased. With the extrusion speed increased from 3 to 6 mm/s, the grain sizes and DRX degree increased significantly, and the samples presented the typical <$2\bar{1}\bar{1}1 $>–<$ 11\bar{2}3 $> rare-earth (RE) textures. The alloy extruded at 260°C with extrusion ratio of 10:1 and extrusion speed of 3 mm/s showed the tensile yield strength (TYS) of 213 MPa and EL of 30.6%. After quantitatively analyzing the contribution of strengthening mechanisms, it was found that the grain boundary strengthening and dislocation strengthening played major roles among strengthening contributions. These results provide some guidelines for enlarging the industrial application of extruded Mg–RE alloy.
- Mg–rare earth alloys;
- extrusion temperature;
- extrusion ratio;
- extrusion speed;
- strengthening mechanisms

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