Development of high Fe content squeeze cast 2A16 wrought Al alloys with enhanced mechanical properties at room and elevated temperatures

• Published in: Materials characterization Vol. 142; pp. 389 - 397
• Main Authors: Lin, Bo, Xu, Rui, Li, Haoyu, Xiao, Huaqiang, Zhang, Weiwen, Li, Shaobo
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 01.08.2018
• Subjects: Al-Cu alloys; ALUMINIUM ALLOYS; COMPARATIVE EVALUATIONS; ELONGATION; GRAIN BOUNDARIES; GRAIN SIZE; HEAT TREATMENTS; INTERMETALLIC COMPOUNDS; IRON COMPOUNDS; Iron-rich intermetallics; MATERIALS SCIENCE; Mechanical properties; POROSITY; TENSILE PROPERTIES; Al-Cu alloys; Iron-rich intermetallics; Mechanical properties
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2018.06.009

In this study, the evolution of iron-rich intermetallics and their effects on room and elevated-temperature tensile properties of gravity die cast and squeeze cast 2A16 wrought Al alloys with high Fe content of 0.5% after T7 heat treatment were investigated by various methods. Compared to gravity die-cast alloys, squeeze cast 2A16 wrought Al alloys showed superior tensile properties at both room and elevated temperatures, especially in terms of elongation. This can be attributed to refinement in grain size and iron-rich intermetallics, which decreased porosity and raised dispersoids in α(Al) matrix. However, the increase in mechanical properties at high temperature resulting from applied pressure was lower than that obtained at room temperature. The results were attributed to the refinement in grain size and the weakness of grain boundary at elevated temperature. •Applied pressure improved tensile properties at both room and elevated temperatures.•Experimental alloys meet the requirement of safety-critical component in automotive industry.•Increasing value of mechanical properties at elevated temperatures resulting from pressure decreases