Abstract
Abstract In the present work, Low-cycle fatigue (LCF) tests were performed on A356 Aluminium alloy and A356-TiB2(5wt%) in-situ nano-composites to estimate their fatigue performance. The tests were performed by strain controlled with a strain ratio of Re = -1. The cyclic stress–strain curves were determined for each imposed strain levels. The LCF and their characterization in the cyclic plastic response of both the alloy and composites were analysed. It is interesting to note that the type of cyclic deformation behaviour in Al-Mg-Si alloys seems to be influenced by the dispersed phases and TiB2 particles. The LCF values for the A356-TiB2(5wt%) composites were found to be higher than those of the A356 alloy. The separation fatigue life’s of the A356-TiB2(5wt%) in-situ nano-composite and A356 alloy was found to be 15652 and 12350 cycles respectively. This is attributed due to the presence of minute TiB2 particles which obviously affected the microstructure, hardness, tensile strength and fatigue life of the composites compared to the base alloy. It is further noted that the LCF values of the present composites were found to be higher than those of the alloys reported in the literature.
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