Ce和La对Al-Zn合金微观组织和力学性能的影响

doi:10.11901/1005.3093.2024.123

材料研究学报

2024, Vol. 38

Issue (9): 651-658 DOI: 10.11901/1005.3093.2024.123

研究论文

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Ce和La对Al-Zn合金微观组织和力学性能的影响

李培跃¹(

), 张明辉¹, 孙文韬², 鲍志豪², 高琦¹, 王延枝¹, 牛龙¹

1 中国船舶集团有限公司第七二五研究所洛阳 471023
2 东北大学材料科学与工程学院沈阳 110819

Effect of Ce and La on Microstructure and Mechanical Properties of Al-Zn Alloy

LI Peiyue¹(

), ZHANG Minghui¹, SUN Wentao², BAO Zhihao², GAO Qi¹, WANG Yanzhi¹, NIU Long¹

1 Luoyang Ship Materials Research Institute, Luoyang 471023, China
2 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

李培跃, 张明辉, 孙文韬, 鲍志豪, 高琦, 王延枝, 牛龙. Ce和La对Al-Zn合金微观组织和力学性能的影响[J]. 材料研究学报, 2024, 38(9): 651-658.
Peiyue LI, Minghui ZHANG, Wentao SUN, Zhihao BAO, Qi GAO, Yanzhi WANG, Long NIU. Effect of Ce and La on Microstructure and Mechanical Properties of Al-Zn Alloy[J]. Chinese Journal of Materials Research, 2024, 38(9): 651-658.

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摘要:

使用金相(OM)和扫描电镜(SEM)观测、XRD谱、硬度和耐磨性测试等手段，研究了混合稀土元素Ce和La对Al-Zn合金的微观组织和力学性能的影响。结果表明：在Al-Zn合金中加入稀土元素Ce和La，使合金微观组织中沿晶界生成Al₁₁Ce₃相和Al₁₁La₃相，在合金基体内分布点状富铁相，稀土含量为0.75%时生成棒状初生Al₁₁Ce₃相。随着混合稀土含量的提高Al-Zn合金的晶粒逐渐细化，稀土含量为0.75%的合金晶粒尺寸最小，约为151 μm。随着混合稀土含量的提高合金的硬度和耐磨性随之提高，稀土含量为0.75%的合金硬度最高(约为27.5HV)；耐磨性最好，平均摩擦因数为1.076，平均磨损率为36.5 mg·N^-1·m^-1。在Al-Zn合金的摩擦磨损过程中，发生磨料磨损、剥层磨损和塑性变形。

关键词 ：金属材料, Al-Zn合金, 微合金化, 微观组织, 力学性能, 磨损机理

Abstract：

The effect of mixed rare earth elements Ce and La on the microstructure and mechanical properties of Al-Zn alloy was studied by means of metallographic (OM), scanning electron microscopy (SEM), X-ray diffractometer (XRD), hardness tester and wear resistance test. The results show that after the addition of Ce and La, the Al-Zn alloy presents microstructure composed of three phases: eutectic Al₁₁Ce₃ and Al₁₁La₃ phases distributed along the grain boundaries and punctate iron-rich phases distributed in the matrix, furthermore, a rod-shaped primary Al₁₁Ce₃ phase may emerge when 0.75%RE is added. With the increase of mixed rare earth content, the grain of Al-Zn alloy is gradually refined, while the grain size is the smallest when the rare earth content is 0.75%, which is about 151 μm. The smaller the grain size, the higher the hardness and wear resistance of the alloy. Among others, the hardness is the highest, about 27.5HV, and the wear resistance is also the highest, the average friction factor is 1.076, and the average wear rate is 36.5 mg·N^-1·m^-1 for the alloy with addition of 0.75% mixed RE. In the process of friction wear, abrasive wear, peeling wear and plastic deformation mainly occur for the Al-Zn alloys.

Key words： metallic materials Al-Zn alloy microalloying microstructure mechanical properties wear mechanism

收稿日期: 2024-03-18

ZTFLH:

TG146.21

通讯作者: 李培跃，研究员，lpy110015@163.com，研究方向为特种金属材料应用技术

Corresponding author: LI Peiyue, Tel: (0379)64829109, E-mail: lpy110015@163.com

作者简介: 李培跃，男，1983年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.123 或 https://www.cjmr.org/CN/Y2024/V38/I9/651

表1 Al-Zn合金的成分

图1 摩擦磨损实验的示意图

图2 不同稀土含量Al-Zn合金的金相组织

图3 不同稀土含量Al-Zn合金的XRD谱

图4 添加0.75%RE的Al-Zn合金的SEM图像

表2 图4中标示点的EDS分析结果

图5 不同稀土含量Al-Zn合金的偏光组织

图6 不同稀土含量Al-Zn合金的平均晶粒尺寸

图7 不同稀土含量Al-Zn合金的硬度

图8 不同稀土含量Al-Zn合金的摩擦系数

图9 不同稀土含量Al-Zn合金的平均摩擦系数和磨损率

图10 Al-Zn合金表面的磨损形貌

图11 不同稀土含量Al-Zn合金磨损表面的形貌

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