期刊
MATERIALS CHARACTERIZATION
卷 145, 期 -, 页码 507-515出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.09.006
关键词
Spray forming; AA6061 alloy; Solidification path; Aluminum recycling; Interrnetallics
类别
资金
- Brazilian research funding agency FAPESP [2013/05987-8]
- Brazilian research funding agency CNPq
- Brazilian research funding agency CAPES
Typically, aluminum alloys are contaminated by iron during recycling cycles. Such a procedure leads to the formation of intermetallic phases with detrimental morphology, which acts as stress risers, impairing mechanical properties and consequently hindering further mechanical processing and restricting recycling. This paper aimed at studying the solidification of an AA6061 alloy highly contaminated with iron (1.4 wt%). Spray forming processing allowed altering the solidification path of the Fe-modified AA 6061 alloy, resulting in the formation of primary alpha-Al-15(Fe, Mn)(3)Si-2 phase with polyhedral morphology, which traps Fe and Si at elevated temperature. Furthermore, spray forming prevented the formation of intermetallic AlFeSi phases with platelet-like morphology, such as beta-AlFeSi as well as the typical Chinese script morphology, resulting in a final ductile microstructure, allowing further processing by hot extrusion.
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