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Materials (Basel). 2016 Dec 5;9(12). pii: E984. doi: 10.3390/ma9120984.

Fretting Fatigue Experiment and Analysis of AlSi9Cu2Mg Alloy.

Author information

1
School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China. wjsczq@163.com.
2
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China. wjsczq@163.com.
3
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China. xh725@263.net.
4
School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China. sutiexiong@nuc.edu.cn.
5
School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China. zhangyi_taiyuan@163.com.
6
China North Engine Research Institute, Tianjin 300400, China. guozhen@163.com.
7
School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China. maohp@nuc.edu.cn.
8
School of Mechanical and Power Engineering, North University of China, Taiyuan 030051, China. zyg31124@163.com.

Abstract

An investigation was carried out in order to study the fretting fatigue behavior of an AlSi9Cu2Mg aluminum alloy. The fretting fatigue tests of AlSi9Cu2Mg were performed using a specially designed testing machine. The failure mechanism of fretting fatigue was explored by studying the fracture surfaces, fretting scars, fretting debris, and micro-hardness of fretting fatigue specimens using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and micro Vickers hardness test techniques. The experimental results show that the fretting fatigue limit (42 MPa) is significantly reduced to approximately 47% of the plain fatigue limit (89 MPa) under 62.5 MPa contact pressure. Furthermore, the fretting fatigue life decreases with increasing alternating stress and increasing contact pressure. The examination results suggest that the stress concentrates induced by oxidation-assisted wear on the contact interface led to the earlier initiation and propagation of crack under the fretting condition.

KEYWORDS:

fractography; fretting debris; fretting fatigue; fretting scar; micro-hardness

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