Abstract
High cycle fatigue (HCF) behavior of a new heat-resistant aluminum alloy at elevated temperature was investigated. This alloy consists of an α-Al matrix, a small amount of precipitated Mg2Si, and distributed (Co, Ni)3Al4 strengthening particles. HCF tests were conducted with a stress ratio of (R)=0 and a frequency of (F)=30 Hz at 130 °C. The fatigue limit (maximum stress) of this alloy was 120 MPa at 107 cycles. This is a value superior to that of conventional heat-resistant aluminum alloys such as the A319 alloy. Furthermore, regardless of the stress conditions, the new heat-resistant Al alloy has an outstanding fatigue life at high temperatures. The results of fractography observation showed that second phases, especially (Co, Ni)3Al4 particles, were effective to the resistance of fatigue crack initiation and propagation. On the other hand, Mg2Si particles were more easily fractured by the fatigue crack. This study also clarifies the micromechanism of fatigue deformation behavior at elevated temperature related to its microstructure.
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Kim, KS., Sung, SY., Han, BS. et al. High temperature high cycle fatigue behavior of new aluminum alloy strengthened by (Co, Ni)3Al4 particles. Met. Mater. Int. 20, 243–248 (2014). https://doi.org/10.1007/s12540-014-2006-9
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DOI: https://doi.org/10.1007/s12540-014-2006-9