Fatigue crack growth behaviour of an Al-Mg4.5Mn alloy fabricated by hybrid in situ rolled wire + arc additive manufacturing. (October 2021)

• Record Type: Journal Article
• Authors: Liao, Zhen; Yang, Bing; Xiao, Shoune; Yang, Guangwu; Zhu, Tao
• Is Part Of: International journal of fatigue. Volume 151(2021)
• Publication Date: 2021-10
• Subjects: HRAM -- Al-Mg4.5Mn alloy -- Tensile properties -- Fatigue crack growth -- Microstructure; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2021.106382
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Al-Mg4.5Mn alloy was processed by hybrid in situ rolled wire + arc additive manufacturing. Anisotropic mechanical properties are related to grain misorientation and texture. The difference of FCG rate is determined by the microstructure of crack tip. 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.