Fatigue in a heat treatable high silicon containing aluminium alloy

6th International Conference on Fracture Fatigue and Wear

González, J.A.^1 ; Talamantes-Silva, J.^1 ; Valtierra, S.^1 ; Colás, Rafael^2

Nemak México, S.A. Libramiento Arco Vial Km, 3.8, García-N.L.

66000, Mexico^1

Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, San-Nicolás, N.L.

66455, Mexico^2

关键词: Cast aluminium alloys;    Engine components;    Fatigue cracks;    High cycle fatigue;    Hypoeutectic Al-Si alloy;    Hypoeutectic alloys;    Servo-hydraulic machine;    Wear resistant alloy;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/843/1/012027/pdf
DOI  :  10.1088/1742-6596/843/1/012027

来源: IOP

【 摘 要 】

The use of cast aluminium alloys in automobiles contributes to reductions in weight and fuel consumption without impairing the safety for the occupants or the performance of the car. Most of the alloys used are heat treatable hypoeutectic Al-Si alloys, which have the drawback of exhibiting low wear resistance. So industry relies in wear resistant alloys, such as grey iron, for the liners of the combustion chambers in engine blocks, which increase the weight of the engine. Therefore, it is of interest to cast high silicon containing alloys into engine components that are able to resist wear while maintaining the mechanical properties required by the components. This work presents the result of the work carried out in a high silicon containing heat treatable aluminium alloy as it is subjected to high cycle fatigue. The alloy was prepared and cast in ingots designed to promote one dimensional solidification gradient to obtain samples to study the high cycle fatigue. The material was machined into hour-glass specimens that were tested at room temperature in a servohydraulic machine under load control following the stair case method. The results show that the resistance to fatigue depends on the microstructure of the sample, as the fatigue cracks originate in pores close to the surface of the sample and propagate through the eutectic aggregate. The results from this work are compared with those from previously obtained with hypoeutectic alloys.