Abstract
The mechanical properties of Al-Mg4.5Mn alloy manufactured by hybrid in situ rolled wire + arc additive manufacturing (HRAM) in different notch orientations were evaluated. Then, the fatigue crack propagation (FCG) tests were conducted on specimens of the HRAM-processed Al-Mg4.5Mn alloy. After that, the microstructure near the crack tip of two specimens from different notch orientations was analysed using electron backscatter diffraction. The results show that the HRAM-processed Al-Mg4.5Mn alloy can achieve superior tensile properties compared to the commercial ER5087, and the mechanical properties and FCG behaviour of the HRAM-processed Al-Mg4.5Mn alloy were correlated with the microstructural features and stress ratio.
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