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.

评估了由混合原位轧线+电弧增材制造（HRAM）制造的Al-Mg4.5Mn合金在不同缺口方向上的力学性能。然后，对 HRAM 处理的 Al-Mg4.5Mn 合金试样进行疲劳裂纹扩展 (FCG) 测试。之后，使用电子背散射衍射分析了来自不同缺口方向的两个试样裂纹尖端附近的微观结构。结果表明，与商业 ER5087 相比，HRAM 处理的 Al-Mg4.5Mn 合金可以实现优异的拉伸性能，并且 HRAM 处理的 Al-Mg4.5Mn 合金的力学性能和 FCG 行为与显微组织特征和应力比。