Fatigue Properties of Overaged Cast Aluminium-7Silicon-0.3Magnesium Alloy

4th International Conference on Structure, Processing and Properties of Materials

Islam, R.^1 ; Rahman, A.^1 ; Bazlur Rashid, A.K.M.^1

Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka

1000, Bangladesh^1

关键词: Ageing conditions;    Al-7Si-0.3Mg alloys;    Al-7Si-Mg alloys;    Fatigue behaviour;    Fatigue properties;    Low cycle fatigues;    Silicon particles;    Solution treatments;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/438/1/012019/pdf
DOI  :  10.1088/1757-899X/438/1/012019

来源: IOP

【 摘 要 】

Over the years, Al-7Si-Mg alloys are used because of their excellent castability, high weight-to-strength ratio, good corrosion resistance and good weldability. In this paper, the fatigue behaviour of Al-7Si-0.3Mg alloys, conforming to A356, has been studied. Specimens of this material were fatigue tested in both the as cast condition, solution treated and aged conditions. The fatigue test was conducted using 3-point fatigue bending setup with the principle of low cycle fatigue failure mechanism. Overaging is found to affect the fatigue behaviour of Al-7Si-0.3Mg alloys. The fatigue properties of as cast alloys showed a three times increase upon solution treatment. Peak ageing condition further improves the fatigue value. Exposure to severe overageing conditions reduced the fatigue properties somewhat from that of the peak values but still maintained higher value than the as-cast conditions, which is constant irrespective of the overageing condition. The improved fatigue properties of heat treated samples can be generally attributed to the spheroidisation of acicular silicon particles.