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

doi:10.11901/1005.3093.2024.123

Chinese Journal of Materials Research

2024, Vol. 38

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

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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

Cite this article:

LI Peiyue, ZHANG Minghui, SUN Wentao, BAO Zhihao, GAO Qi, WANG Yanzhi, NIU Long. Effect of Ce and La on Microstructure and Mechanical Properties of Al-Zn Alloy. Chinese Journal of Materials Research, 2024, 38(9): 651-658.

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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

Received: 18 March 2024

ZTFLH:

TG146.21

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

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	LI Peiyue
	ZHANG Minghui
	SUN Wentao
	BAO Zhihao
	GAO Qi
	WANG Yanzhi
	NIU Long

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.123 OR https://www.cjmr.org/EN/Y2024/V38/I9/651

Table 1 Chemical composition of Al-Zn alloys (mass fraction, %)

Fig.1 Schematic diagram of friction and wear experiment

Fig.2 Metallographic structure of Al-Zn alloys with different rare earth contents (a) 0%RE, (b) 0.2%RE, (c) 0.5%RE, (d)0.75%RE

Fig.3 XRD spectrum of Al-Zn alloys with different rare earth contents

Fig.4 SEM image of 0.75% RE Al-Zn alloy added

Table 2 EDS analysis results of the marked points in Fig.4 (mass fraction, %)

Fig.5 Polarizing structure of Al-Zn alloys with different rare earth contents (a) 0%, (b) 0.2%, (c) 0.5%, (d) 0.75%

Fig.6 Average grain size of Al-Zn alloys with different rare earth contents

Fig.7 Hardness of Al-Zn alloys with different rare earth contents

Fig.8 Friction coefficient curves of Al-Zn alloys with different rare earth contents (a) 0%, (b) 0.2%, (c) 0.5%, (d) 0.75%

Fig.9 Average coefficient of friction and wear rate of Al-Zn alloys with different rare earth contents

Fig.10 Wear morphology of the surface of Al-Zn alloy

Fig.11 Wear surface morphology of Al-Zn alloys with different rare earth contents (a) 0%, (b) 0.75%

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